Refactor Rust drivers for strict idiomatic documentation and 8-line enforcement

2026-07-05 03:57:50 +02:00 · 2023-10-06 14:27:20 -04:00
commit 46e8b76762
1231 changed files with 110385 additions and 0 deletions
@@ -0,0 +1,22 @@
+{
+    "configurations": [
+        {
+            "name": "Pico",
+            "includePath": [
+                "${workspaceFolder}/**",
+                "${userHome}/.pico-sdk/sdk/2.2.0/**"
+            ],
+            "forcedInclude": [
+                "${userHome}/.pico-sdk/sdk/2.2.0/src/common/pico_base_headers/include/pico.h",
+                "${workspaceFolder}/build/generated/pico_base/pico/config_autogen.h"
+            ],
+            "defines": [],
+            "compilerPath": "${userHome}/.pico-sdk/toolchain/14_2_Rel1/bin/arm-none-eabi-gcc.exe",
+            "compileCommands": "${workspaceFolder}/build/compile_commands.json",
+            "cStandard": "c17",
+            "cppStandard": "c++14",
+            "intelliSenseMode": "linux-gcc-arm"
+        }
+    ],
+    "version": 4
+}
@@ -0,0 +1,15 @@
+[
+    {
+        "name": "Pico",
+        "compilers": {
+            "C": "${command:raspberry-pi-pico.getCompilerPath}",
+            "CXX": "${command:raspberry-pi-pico.getCxxCompilerPath}"
+        },
+        "environmentVariables": {
+            "PATH": "${command:raspberry-pi-pico.getEnvPath};${env:PATH}"
+        },
+        "cmakeSettings": {
+            "Python3_EXECUTABLE": "${command:raspberry-pi-pico.getPythonPath}"
+        }
+    }
+]
@@ -0,0 +1,9 @@
+{
+    "recommendations": [
+        "marus25.cortex-debug",
+        "ms-vscode.cpptools",
+        "ms-vscode.cpptools-extension-pack",
+        "ms-vscode.vscode-serial-monitor",
+        "raspberry-pi.raspberry-pi-pico"
+    ]
+}
@@ -0,0 +1,50 @@
+{
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "Pico Debug (Cortex-Debug)",
+            "cwd": "${userHome}/.pico-sdk/openocd/0.12.0+dev/scripts",
+            "executable": "${command:raspberry-pi-pico.launchTargetPath}",
+            "request": "launch",
+            "type": "cortex-debug",
+            "servertype": "openocd",
+            "serverpath": "${userHome}/.pico-sdk/openocd/0.12.0+dev/openocd.exe",
+            "gdbPath": "${command:raspberry-pi-pico.getGDBPath}",
+            "device": "${command:raspberry-pi-pico.getChipUppercase}",
+            "configFiles": [
+                "interface/cmsis-dap.cfg",
+                "target/${command:raspberry-pi-pico.getTarget}.cfg"
+            ],
+            "svdFile": "${userHome}/.pico-sdk/sdk/2.2.0/src/${command:raspberry-pi-pico.getChip}/hardware_regs/${command:raspberry-pi-pico.getChipUppercase}.svd",
+            "runToEntryPoint": "main",
+            // Fix for no_flash binaries, where monitor reset halt doesn't do what is expected
+            // Also works fine for flash binaries
+            "overrideLaunchCommands": [
+                "monitor reset init",
+                "load \"${command:raspberry-pi-pico.launchTargetPath}\""
+            ],
+            "openOCDLaunchCommands": [
+                "adapter speed 5000"
+            ]
+        },
+        {
+            "name": "Pico Debug (Cortex-Debug with external OpenOCD)",
+            "cwd": "${workspaceRoot}",
+            "executable": "${command:raspberry-pi-pico.launchTargetPath}",
+            "request": "launch",
+            "type": "cortex-debug",
+            "servertype": "external",
+            "gdbTarget": "localhost:3333",
+            "gdbPath": "${command:raspberry-pi-pico.getGDBPath}",
+            "device": "${command:raspberry-pi-pico.getChipUppercase}",
+            "svdFile": "${userHome}/.pico-sdk/sdk/2.2.0/src/${command:raspberry-pi-pico.getChip}/hardware_regs/${command:raspberry-pi-pico.getChipUppercase}.svd",
+            "runToEntryPoint": "main",
+            // Fix for no_flash binaries, where monitor reset halt doesn't do what is expected
+            // Also works fine for flash binaries
+            "overrideLaunchCommands": [
+                "monitor reset init",
+                "load \"${command:raspberry-pi-pico.launchTargetPath}\""
+            ]
+        },
+    ]
+}
@@ -0,0 +1,43 @@
+{
+    "cmake.showSystemKits": false,
+    "cmake.options.statusBarVisibility": "hidden",
+    "cmake.options.advanced": {
+        "build": {
+            "statusBarVisibility": "hidden"
+        },
+        "launch": {
+            "statusBarVisibility": "hidden"
+        },
+        "debug": {
+            "statusBarVisibility": "hidden"
+        }
+    },
+    "cmake.configureOnEdit": false,
+    "cmake.automaticReconfigure": false,
+    "cmake.configureOnOpen": false,
+    "cmake.generator": "Ninja",
+    "cmake.cmakePath": "${userHome}/.pico-sdk/cmake/v3.31.5/bin/cmake",
+    "C_Cpp.debugShortcut": false,
+    "terminal.integrated.env.windows": {
+        "PICO_SDK_PATH": "${env:USERPROFILE}/.pico-sdk/sdk/2.2.0",
+        "PICO_TOOLCHAIN_PATH": "${env:USERPROFILE}/.pico-sdk/toolchain/14_2_Rel1",
+        "Path": "${env:USERPROFILE}/.pico-sdk/toolchain/14_2_Rel1/bin;${env:USERPROFILE}/.pico-sdk/picotool/2.2.0/picotool;${env:USERPROFILE}/.pico-sdk/cmake/v3.31.5/bin;${env:USERPROFILE}/.pico-sdk/ninja/v1.12.1;${env:PATH}"
+    },
+    "terminal.integrated.env.osx": {
+        "PICO_SDK_PATH": "${env:HOME}/.pico-sdk/sdk/2.2.0",
+        "PICO_TOOLCHAIN_PATH": "${env:HOME}/.pico-sdk/toolchain/14_2_Rel1",
+        "PATH": "${env:HOME}/.pico-sdk/toolchain/14_2_Rel1/bin:${env:HOME}/.pico-sdk/picotool/2.2.0/picotool:${env:HOME}/.pico-sdk/cmake/v3.31.5/bin:${env:HOME}/.pico-sdk/ninja/v1.12.1:${env:PATH}"
+    },
+    "terminal.integrated.env.linux": {
+        "PICO_SDK_PATH": "${env:HOME}/.pico-sdk/sdk/2.2.0",
+        "PICO_TOOLCHAIN_PATH": "${env:HOME}/.pico-sdk/toolchain/14_2_Rel1",
+        "PATH": "${env:HOME}/.pico-sdk/toolchain/14_2_Rel1/bin:${env:HOME}/.pico-sdk/picotool/2.2.0/picotool:${env:HOME}/.pico-sdk/cmake/v3.31.5/bin:${env:HOME}/.pico-sdk/ninja/v1.12.1:${env:PATH}"
+    },
+    "raspberry-pi-pico.cmakeAutoConfigure": true,
+    "raspberry-pi-pico.useCmakeTools": false,
+    "raspberry-pi-pico.cmakePath": "${HOME}/.pico-sdk/cmake/v3.31.5/bin/cmake",
+    "raspberry-pi-pico.ninjaPath": "${HOME}/.pico-sdk/ninja/v1.12.1/ninja",
+    "files.associations": {
+        "stdlib.h": "c"
+    }
+}
@@ -0,0 +1,125 @@
+{
+    "version": "2.0.0",
+    "tasks": [
+        {
+            "label": "Compile Project",
+            "type": "process",
+            "isBuildCommand": true,
+            "dependsOn": "Configure Project",
+            "dependsOrder": "sequence",
+            "command": "${userHome}/.pico-sdk/ninja/v1.12.1/ninja",
+            "args": ["-C", "${workspaceFolder}/build"],
+            "group": "build",
+            "presentation": {
+                "reveal": "always",
+                "panel": "dedicated"
+            },
+            "problemMatcher": "$gcc",
+            "windows": {
+                "command": "${env:USERPROFILE}/.pico-sdk/ninja/v1.12.1/ninja.exe"
+            }
+        },
+        {
+            "label": "Configure Project",
+            "type": "process",
+            "command": "${userHome}/.pico-sdk/cmake/v3.31.5/bin/cmake",
+            "args": [
+                "-S",
+                "${workspaceFolder}",
+                "-B",
+                "${workspaceFolder}/build",
+                "-G",
+                "Ninja"
+            ],
+            "presentation": {
+                "reveal": "always",
+                "panel": "dedicated"
+            },
+            "problemMatcher": "$gcc",
+            "windows": {
+                "command": "${env:USERPROFILE}/.pico-sdk/cmake/v3.31.5/bin/cmake.exe"
+            }
+        },
+        {
+            "label": "Run Project",
+            "type": "process",
+            "command": "${env:HOME}/.pico-sdk/picotool/2.2.0/picotool/picotool",
+            "args": [
+                "load",
+                "${command:raspberry-pi-pico.launchTargetPath}",
+                "-fx"
+            ],
+            "presentation": {
+                "reveal": "always",
+                "panel": "dedicated"
+            },
+            "problemMatcher": [],
+            "windows": {
+                "command": "${env:USERPROFILE}/.pico-sdk/picotool/2.2.0/picotool/picotool.exe"
+            }
+        },
+        {
+            "label": "Flash",
+            "type": "process",
+            "command": "${userHome}/.pico-sdk/openocd/0.12.0+dev/openocd.exe",
+            "args": [
+                "-s",
+                "${userHome}/.pico-sdk/openocd/0.12.0+dev/scripts",
+                "-f",
+                "interface/cmsis-dap.cfg",
+                "-f",
+                "target/${command:raspberry-pi-pico.getTarget}.cfg",
+                "-c",
+                "adapter speed 5000; program \"${command:raspberry-pi-pico.launchTargetPath}\" verify reset exit"
+            ],
+            "problemMatcher": [],
+            "windows": {
+                "command": "${env:USERPROFILE}/.pico-sdk/openocd/0.12.0+dev/openocd.exe",
+            }
+        },
+        {
+            "label": "Rescue Reset",
+            "type": "process",
+            "command": "${userHome}/.pico-sdk/openocd/0.12.0+dev/openocd.exe",
+            "args": [
+                "-s",
+                "${userHome}/.pico-sdk/openocd/0.12.0+dev/scripts",
+                "-f",
+                "interface/cmsis-dap.cfg",
+                "-f",
+                "target/${command:raspberry-pi-pico.getChip}-rescue.cfg",
+                "-c",
+                "adapter speed 5000; reset halt; exit"
+            ],
+            "problemMatcher": [],
+            "windows": {
+                "command": "${env:USERPROFILE}/.pico-sdk/openocd/0.12.0+dev/openocd.exe",
+            }
+        },
+        {
+            "label": "Risc-V Reset (RP2350)",
+            "type": "process",
+            "command": "${userHome}/.pico-sdk/openocd/0.12.0+dev/openocd.exe",
+            "args": [
+                "-s",
+                "${userHome}/.pico-sdk/openocd/0.12.0+dev/scripts",
+                "-c",
+                "set USE_CORE { rv0 rv1 cm0 cm1 }",
+                "-f",
+                "interface/cmsis-dap.cfg",
+                "-f",
+                "target/rp2350.cfg",
+                "-c",
+                "adapter speed 5000; init;",
+                "-c",
+                "write_memory 0x40120158 8 { 0x3 }; echo [format \"Info : ARCHSEL 0x%02x\" [read_memory 0x40120158 8 1]];",
+                "-c",
+                "reset halt; targets rp2350.rv0; echo [format \"Info : ARCHSEL_STATUS 0x%02x\" [read_memory 0x4012015C 8 1]]; exit"
+            ],
+            "problemMatcher": [],
+            "windows": {
+                "command": "${env:USERPROFILE}/.pico-sdk/openocd/0.12.0+dev/openocd.exe",
+            }
+        }
+    ]
+}
@@ -0,0 +1,22 @@
+{
+    "configurations": [
+        {
+            "name": "Pico",
+            "includePath": [
+                "${workspaceFolder}/**",
+                "${userHome}/.pico-sdk/sdk/2.2.0/**"
+            ],
+            "forcedInclude": [
+                "${userHome}/.pico-sdk/sdk/2.2.0/src/common/pico_base_headers/include/pico.h",
+                "${workspaceFolder}/build/generated/pico_base/pico/config_autogen.h"
+            ],
+            "defines": [],
+            "compilerPath": "${userHome}/.pico-sdk/toolchain/14_2_Rel1/bin/arm-none-eabi-gcc.exe",
+            "compileCommands": "${workspaceFolder}/build/compile_commands.json",
+            "cStandard": "c17",
+            "cppStandard": "c++14",
+            "intelliSenseMode": "linux-gcc-arm"
+        }
+    ],
+    "version": 4
+}
@@ -0,0 +1,15 @@
+[
+    {
+        "name": "Pico",
+        "compilers": {
+            "C": "${command:raspberry-pi-pico.getCompilerPath}",
+            "CXX": "${command:raspberry-pi-pico.getCxxCompilerPath}"
+        },
+        "environmentVariables": {
+            "PATH": "${command:raspberry-pi-pico.getEnvPath};${env:PATH}"
+        },
+        "cmakeSettings": {
+            "Python3_EXECUTABLE": "${command:raspberry-pi-pico.getPythonPath}"
+        }
+    }
+]
@@ -0,0 +1,9 @@
+{
+    "recommendations": [
+        "marus25.cortex-debug",
+        "ms-vscode.cpptools",
+        "ms-vscode.cpptools-extension-pack",
+        "ms-vscode.vscode-serial-monitor",
+        "raspberry-pi.raspberry-pi-pico"
+    ]
+}
@@ -0,0 +1,50 @@
+{
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "Pico Debug (Cortex-Debug)",
+            "cwd": "${userHome}/.pico-sdk/openocd/0.12.0+dev/scripts",
+            "executable": "${command:raspberry-pi-pico.launchTargetPath}",
+            "request": "launch",
+            "type": "cortex-debug",
+            "servertype": "openocd",
+            "serverpath": "${userHome}/.pico-sdk/openocd/0.12.0+dev/openocd.exe",
+            "gdbPath": "${command:raspberry-pi-pico.getGDBPath}",
+            "device": "${command:raspberry-pi-pico.getChipUppercase}",
+            "configFiles": [
+                "interface/cmsis-dap.cfg",
+                "target/${command:raspberry-pi-pico.getTarget}.cfg"
+            ],
+            "svdFile": "${userHome}/.pico-sdk/sdk/2.2.0/src/${command:raspberry-pi-pico.getChip}/hardware_regs/${command:raspberry-pi-pico.getChipUppercase}.svd",
+            "runToEntryPoint": "main",
+            // Fix for no_flash binaries, where monitor reset halt doesn't do what is expected
+            // Also works fine for flash binaries
+            "overrideLaunchCommands": [
+                "monitor reset init",
+                "load \"${command:raspberry-pi-pico.launchTargetPath}\""
+            ],
+            "openOCDLaunchCommands": [
+                "adapter speed 5000"
+            ]
+        },
+        {
+            "name": "Pico Debug (Cortex-Debug with external OpenOCD)",
+            "cwd": "${workspaceRoot}",
+            "executable": "${command:raspberry-pi-pico.launchTargetPath}",
+            "request": "launch",
+            "type": "cortex-debug",
+            "servertype": "external",
+            "gdbTarget": "localhost:3333",
+            "gdbPath": "${command:raspberry-pi-pico.getGDBPath}",
+            "device": "${command:raspberry-pi-pico.getChipUppercase}",
+            "svdFile": "${userHome}/.pico-sdk/sdk/2.2.0/src/${command:raspberry-pi-pico.getChip}/hardware_regs/${command:raspberry-pi-pico.getChipUppercase}.svd",
+            "runToEntryPoint": "main",
+            // Fix for no_flash binaries, where monitor reset halt doesn't do what is expected
+            // Also works fine for flash binaries
+            "overrideLaunchCommands": [
+                "monitor reset init",
+                "load \"${command:raspberry-pi-pico.launchTargetPath}\""
+            ]
+        },
+    ]
+}
@@ -0,0 +1,43 @@
+{
+    "cmake.showSystemKits": false,
+    "cmake.options.statusBarVisibility": "hidden",
+    "cmake.options.advanced": {
+        "build": {
+            "statusBarVisibility": "hidden"
+        },
+        "launch": {
+            "statusBarVisibility": "hidden"
+        },
+        "debug": {
+            "statusBarVisibility": "hidden"
+        }
+    },
+    "cmake.configureOnEdit": false,
+    "cmake.automaticReconfigure": false,
+    "cmake.configureOnOpen": false,
+    "cmake.generator": "Ninja",
+    "cmake.cmakePath": "${userHome}/.pico-sdk/cmake/v3.31.5/bin/cmake",
+    "C_Cpp.debugShortcut": false,
+    "terminal.integrated.env.windows": {
+        "PICO_SDK_PATH": "${env:USERPROFILE}/.pico-sdk/sdk/2.2.0",
+        "PICO_TOOLCHAIN_PATH": "${env:USERPROFILE}/.pico-sdk/toolchain/14_2_Rel1",
+        "Path": "${env:USERPROFILE}/.pico-sdk/toolchain/14_2_Rel1/bin;${env:USERPROFILE}/.pico-sdk/picotool/2.2.0/picotool;${env:USERPROFILE}/.pico-sdk/cmake/v3.31.5/bin;${env:USERPROFILE}/.pico-sdk/ninja/v1.12.1;${env:PATH}"
+    },
+    "terminal.integrated.env.osx": {
+        "PICO_SDK_PATH": "${env:HOME}/.pico-sdk/sdk/2.2.0",
+        "PICO_TOOLCHAIN_PATH": "${env:HOME}/.pico-sdk/toolchain/14_2_Rel1",
+        "PATH": "${env:HOME}/.pico-sdk/toolchain/14_2_Rel1/bin:${env:HOME}/.pico-sdk/picotool/2.2.0/picotool:${env:HOME}/.pico-sdk/cmake/v3.31.5/bin:${env:HOME}/.pico-sdk/ninja/v1.12.1:${env:PATH}"
+    },
+    "terminal.integrated.env.linux": {
+        "PICO_SDK_PATH": "${env:HOME}/.pico-sdk/sdk/2.2.0",
+        "PICO_TOOLCHAIN_PATH": "${env:HOME}/.pico-sdk/toolchain/14_2_Rel1",
+        "PATH": "${env:HOME}/.pico-sdk/toolchain/14_2_Rel1/bin:${env:HOME}/.pico-sdk/picotool/2.2.0/picotool:${env:HOME}/.pico-sdk/cmake/v3.31.5/bin:${env:HOME}/.pico-sdk/ninja/v1.12.1:${env:PATH}"
+    },
+    "raspberry-pi-pico.cmakeAutoConfigure": true,
+    "raspberry-pi-pico.useCmakeTools": false,
+    "raspberry-pi-pico.cmakePath": "${HOME}/.pico-sdk/cmake/v3.31.5/bin/cmake",
+    "raspberry-pi-pico.ninjaPath": "${HOME}/.pico-sdk/ninja/v1.12.1/ninja",
+    "files.associations": {
+        "stdlib.h": "c"
+    }
+}
@@ -0,0 +1,125 @@
+{
+    "version": "2.0.0",
+    "tasks": [
+        {
+            "label": "Compile Project",
+            "type": "process",
+            "isBuildCommand": true,
+            "dependsOn": "Configure Project",
+            "dependsOrder": "sequence",
+            "command": "${userHome}/.pico-sdk/ninja/v1.12.1/ninja",
+            "args": ["-C", "${workspaceFolder}/build"],
+            "group": "build",
+            "presentation": {
+                "reveal": "always",
+                "panel": "dedicated"
+            },
+            "problemMatcher": "$gcc",
+            "windows": {
+                "command": "${env:USERPROFILE}/.pico-sdk/ninja/v1.12.1/ninja.exe"
+            }
+        },
+        {
+            "label": "Configure Project",
+            "type": "process",
+            "command": "${userHome}/.pico-sdk/cmake/v3.31.5/bin/cmake",
+            "args": [
+                "-S",
+                "${workspaceFolder}",
+                "-B",
+                "${workspaceFolder}/build",
+                "-G",
+                "Ninja"
+            ],
+            "presentation": {
+                "reveal": "always",
+                "panel": "dedicated"
+            },
+            "problemMatcher": "$gcc",
+            "windows": {
+                "command": "${env:USERPROFILE}/.pico-sdk/cmake/v3.31.5/bin/cmake.exe"
+            }
+        },
+        {
+            "label": "Run Project",
+            "type": "process",
+            "command": "${env:HOME}/.pico-sdk/picotool/2.2.0/picotool/picotool",
+            "args": [
+                "load",
+                "${command:raspberry-pi-pico.launchTargetPath}",
+                "-fx"
+            ],
+            "presentation": {
+                "reveal": "always",
+                "panel": "dedicated"
+            },
+            "problemMatcher": [],
+            "windows": {
+                "command": "${env:USERPROFILE}/.pico-sdk/picotool/2.2.0/picotool/picotool.exe"
+            }
+        },
+        {
+            "label": "Flash",
+            "type": "process",
+            "command": "${userHome}/.pico-sdk/openocd/0.12.0+dev/openocd.exe",
+            "args": [
+                "-s",
+                "${userHome}/.pico-sdk/openocd/0.12.0+dev/scripts",
+                "-f",
+                "interface/cmsis-dap.cfg",
+                "-f",
+                "target/${command:raspberry-pi-pico.getTarget}.cfg",
+                "-c",
+                "adapter speed 5000; program \"${command:raspberry-pi-pico.launchTargetPath}\" verify reset exit"
+            ],
+            "problemMatcher": [],
+            "windows": {
+                "command": "${env:USERPROFILE}/.pico-sdk/openocd/0.12.0+dev/openocd.exe",
+            }
+        },
+        {
+            "label": "Rescue Reset",
+            "type": "process",
+            "command": "${userHome}/.pico-sdk/openocd/0.12.0+dev/openocd.exe",
+            "args": [
+                "-s",
+                "${userHome}/.pico-sdk/openocd/0.12.0+dev/scripts",
+                "-f",
+                "interface/cmsis-dap.cfg",
+                "-f",
+                "target/${command:raspberry-pi-pico.getChip}-rescue.cfg",
+                "-c",
+                "adapter speed 5000; reset halt; exit"
+            ],
+            "problemMatcher": [],
+            "windows": {
+                "command": "${env:USERPROFILE}/.pico-sdk/openocd/0.12.0+dev/openocd.exe",
+            }
+        },
+        {
+            "label": "Risc-V Reset (RP2350)",
+            "type": "process",
+            "command": "${userHome}/.pico-sdk/openocd/0.12.0+dev/openocd.exe",
+            "args": [
+                "-s",
+                "${userHome}/.pico-sdk/openocd/0.12.0+dev/scripts",
+                "-c",
+                "set USE_CORE { rv0 rv1 cm0 cm1 }",
+                "-f",
+                "interface/cmsis-dap.cfg",
+                "-f",
+                "target/rp2350.cfg",
+                "-c",
+                "adapter speed 5000; init;",
+                "-c",
+                "write_memory 0x40120158 8 { 0x3 }; echo [format \"Info : ARCHSEL 0x%02x\" [read_memory 0x40120158 8 1]];",
+                "-c",
+                "reset halt; targets rp2350.rv0; echo [format \"Info : ARCHSEL_STATUS 0x%02x\" [read_memory 0x4012015C 8 1]]; exit"
+            ],
+            "problemMatcher": [],
+            "windows": {
+                "command": "${env:USERPROFILE}/.pico-sdk/openocd/0.12.0+dev/openocd.exe",
+            }
+        }
+    ]
+}
@@ -0,0 +1,63 @@
+/**
+ * @file 0x01_uart.c
+ * @brief UART demonstration: echo received characters back in uppercase
+ * @author Kevin Thomas
+ * @date 2025
+ *
+ * MIT License
+ *
+ * Copyright (c) 2025 Kevin Thomas
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ * -----------------------------------------------------------------------------
+ *
+ * Demonstrates hardware UART0 using the uart driver (uart.h / uart.c).
+ * Characters typed into a terminal via a USB-to-UART adapter are echoed
+ * back in uppercase, illustrating full-duplex raw UART operation without
+ * going through the stdio layer.
+ *
+ * Wiring:
+ *   GPIO0 (TX) -> USB-to-UART adapter RX
+ *   GPIO1 (RX) -> USB-to-UART adapter TX
+ *   GND        -> USB-to-UART adapter GND
+ */
+
+#include "pico/stdlib.h"
+#include "uart.h"
+
+/** @brief GPIO pin used for UART0 TX */
+#define UART_TX_PIN  0
+/** @brief GPIO pin used for UART0 RX */
+#define UART_RX_PIN  1
+/** @brief UART baud rate in bits per second */
+#define UART_BAUD    115200
+
+int main(void) {
+    uart_driver_init(UART_TX_PIN, UART_RX_PIN, UART_BAUD);
+    uart_driver_puts("UART driver ready (115200 8N1)\r\n");
+    uart_driver_puts("Type characters to echo them back in UPPERCASE:\r\n");
+    while (true) {
+        if (uart_driver_is_readable()) {
+            char c     = uart_driver_getchar();
+            char upper = uart_driver_to_upper(c);
+            uart_driver_putchar(upper);
+        }
+    }
+}
@@ -0,0 +1,57 @@
+# Generated Cmake Pico project file
+
+cmake_minimum_required(VERSION 3.13)
+
+set(CMAKE_C_STANDARD 11)
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+# Initialise pico_sdk from installed location
+# (note this can come from environment, CMake cache etc)
+
+# == DO NOT EDIT THE FOLLOWING LINES for the Raspberry Pi Pico VS Code Extension to work ==
+if(WIN32)
+    set(USERHOME $ENV{USERPROFILE})
+else()
+    set(USERHOME $ENV{HOME})
+endif()
+set(sdkVersion 2.2.0)
+set(toolchainVersion 14_2_Rel1)
+set(picotoolVersion 2.2.0)
+set(picoVscode ${USERHOME}/.pico-sdk/cmake/pico-vscode.cmake)
+if (EXISTS ${picoVscode})
+    include(${picoVscode})
+endif()
+# ====================================================================================
+set(PICO_BOARD pico2 CACHE STRING "Board type")
+
+# Pull in Raspberry Pi Pico SDK (must be before project)
+include(pico_sdk_import.cmake)
+
+project(0x01_uart C CXX ASM)
+
+# Initialise the Raspberry Pi Pico SDK
+pico_sdk_init()
+
+# Add executable. Default name is the project name, version 0.1
+
+add_executable(0x01_uart 0x01_uart.c uart.c)
+
+pico_set_program_name(0x01_uart "0x01_uart")
+pico_set_program_version(0x01_uart "0.1")
+
+# Disable stdio routing - driver uses hardware UART0 directly (GPIO0/GPIO1)
+pico_enable_stdio_uart(0x01_uart 0)
+pico_enable_stdio_usb(0x01_uart 0)
+
+# Add the standard library to the build
+target_link_libraries(0x01_uart
+    pico_stdlib
+    hardware_uart)
+
+# Add the standard include files to the build
+target_include_directories(0x01_uart PRIVATE
+        ${CMAKE_CURRENT_LIST_DIR}
+)
+
+pico_add_extra_outputs(0x01_uart)
@@ -0,0 +1,121 @@
+# This is a copy of <PICO_SDK_PATH>/external/pico_sdk_import.cmake
+
+# This can be dropped into an external project to help locate this SDK
+# It should be include()ed prior to project()
+
+# Copyright 2020 (c) 2020 Raspberry Pi (Trading) Ltd.
+#
+# Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
+# following conditions are met:
+#
+# 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following
+# disclaimer.
+#
+# 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following
+# disclaimer in the documentation and/or other materials provided with the distribution.
+#
+# 3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products
+# derived from this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
+# INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+if (DEFINED ENV{PICO_SDK_PATH} AND (NOT PICO_SDK_PATH))
+    set(PICO_SDK_PATH $ENV{PICO_SDK_PATH})
+    message("Using PICO_SDK_PATH from environment ('${PICO_SDK_PATH}')")
+endif ()
+
+if (DEFINED ENV{PICO_SDK_FETCH_FROM_GIT} AND (NOT PICO_SDK_FETCH_FROM_GIT))
+    set(PICO_SDK_FETCH_FROM_GIT $ENV{PICO_SDK_FETCH_FROM_GIT})
+    message("Using PICO_SDK_FETCH_FROM_GIT from environment ('${PICO_SDK_FETCH_FROM_GIT}')")
+endif ()
+
+if (DEFINED ENV{PICO_SDK_FETCH_FROM_GIT_PATH} AND (NOT PICO_SDK_FETCH_FROM_GIT_PATH))
+    set(PICO_SDK_FETCH_FROM_GIT_PATH $ENV{PICO_SDK_FETCH_FROM_GIT_PATH})
+    message("Using PICO_SDK_FETCH_FROM_GIT_PATH from environment ('${PICO_SDK_FETCH_FROM_GIT_PATH}')")
+endif ()
+
+if (DEFINED ENV{PICO_SDK_FETCH_FROM_GIT_TAG} AND (NOT PICO_SDK_FETCH_FROM_GIT_TAG))
+    set(PICO_SDK_FETCH_FROM_GIT_TAG $ENV{PICO_SDK_FETCH_FROM_GIT_TAG})
+    message("Using PICO_SDK_FETCH_FROM_GIT_TAG from environment ('${PICO_SDK_FETCH_FROM_GIT_TAG}')")
+endif ()
+
+if (PICO_SDK_FETCH_FROM_GIT AND NOT PICO_SDK_FETCH_FROM_GIT_TAG)
+  set(PICO_SDK_FETCH_FROM_GIT_TAG "master")
+  message("Using master as default value for PICO_SDK_FETCH_FROM_GIT_TAG")
+endif()
+
+set(PICO_SDK_PATH "${PICO_SDK_PATH}" CACHE PATH "Path to the Raspberry Pi Pico SDK")
+set(PICO_SDK_FETCH_FROM_GIT "${PICO_SDK_FETCH_FROM_GIT}" CACHE BOOL "Set to ON to fetch copy of SDK from git if not otherwise locatable")
+set(PICO_SDK_FETCH_FROM_GIT_PATH "${PICO_SDK_FETCH_FROM_GIT_PATH}" CACHE FILEPATH "location to download SDK")
+set(PICO_SDK_FETCH_FROM_GIT_TAG "${PICO_SDK_FETCH_FROM_GIT_TAG}" CACHE FILEPATH "release tag for SDK")
+
+if (NOT PICO_SDK_PATH)
+    if (PICO_SDK_FETCH_FROM_GIT)
+        include(FetchContent)
+        set(FETCHCONTENT_BASE_DIR_SAVE ${FETCHCONTENT_BASE_DIR})
+        if (PICO_SDK_FETCH_FROM_GIT_PATH)
+            get_filename_component(FETCHCONTENT_BASE_DIR "${PICO_SDK_FETCH_FROM_GIT_PATH}" REALPATH BASE_DIR "${CMAKE_SOURCE_DIR}")
+        endif ()
+        FetchContent_Declare(
+                pico_sdk
+                GIT_REPOSITORY https://github.com/raspberrypi/pico-sdk
+                GIT_TAG ${PICO_SDK_FETCH_FROM_GIT_TAG}
+        )
+
+        if (NOT pico_sdk)
+            message("Downloading Raspberry Pi Pico SDK")
+            # GIT_SUBMODULES_RECURSE was added in 3.17
+            if (${CMAKE_VERSION} VERSION_GREATER_EQUAL "3.17.0")
+                FetchContent_Populate(
+                        pico_sdk
+                        QUIET
+                        GIT_REPOSITORY https://github.com/raspberrypi/pico-sdk
+                        GIT_TAG ${PICO_SDK_FETCH_FROM_GIT_TAG}
+                        GIT_SUBMODULES_RECURSE FALSE
+
+                        SOURCE_DIR ${FETCHCONTENT_BASE_DIR}/pico_sdk-src
+                        BINARY_DIR ${FETCHCONTENT_BASE_DIR}/pico_sdk-build
+                        SUBBUILD_DIR ${FETCHCONTENT_BASE_DIR}/pico_sdk-subbuild
+                )
+            else ()
+                FetchContent_Populate(
+                        pico_sdk
+                        QUIET
+                        GIT_REPOSITORY https://github.com/raspberrypi/pico-sdk
+                        GIT_TAG ${PICO_SDK_FETCH_FROM_GIT_TAG}
+
+                        SOURCE_DIR ${FETCHCONTENT_BASE_DIR}/pico_sdk-src
+                        BINARY_DIR ${FETCHCONTENT_BASE_DIR}/pico_sdk-build
+                        SUBBUILD_DIR ${FETCHCONTENT_BASE_DIR}/pico_sdk-subbuild
+                )
+            endif ()
+
+            set(PICO_SDK_PATH ${pico_sdk_SOURCE_DIR})
+        endif ()
+        set(FETCHCONTENT_BASE_DIR ${FETCHCONTENT_BASE_DIR_SAVE})
+    else ()
+        message(FATAL_ERROR
+                "SDK location was not specified. Please set PICO_SDK_PATH or set PICO_SDK_FETCH_FROM_GIT to on to fetch from git."
+                )
+    endif ()
+endif ()
+
+get_filename_component(PICO_SDK_PATH "${PICO_SDK_PATH}" REALPATH BASE_DIR "${CMAKE_BINARY_DIR}")
+if (NOT EXISTS ${PICO_SDK_PATH})
+    message(FATAL_ERROR "Directory '${PICO_SDK_PATH}' not found")
+endif ()
+
+set(PICO_SDK_INIT_CMAKE_FILE ${PICO_SDK_PATH}/pico_sdk_init.cmake)
+if (NOT EXISTS ${PICO_SDK_INIT_CMAKE_FILE})
+    message(FATAL_ERROR "Directory '${PICO_SDK_PATH}' does not appear to contain the Raspberry Pi Pico SDK")
+endif ()
+
+set(PICO_SDK_PATH ${PICO_SDK_PATH} CACHE PATH "Path to the Raspberry Pi Pico SDK" FORCE)
+
+include(${PICO_SDK_INIT_CMAKE_FILE})
@@ -0,0 +1,67 @@
+/**
+ * @file uart.c
+ * @brief Implementation of the hardware UART0 driver
+ * @author Kevin Thomas
+ * @date 2025
+ *
+ * MIT License
+ *
+ * Copyright (c) 2025 Kevin Thomas
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include "uart.h"
+#include "pico/stdlib.h"
+#include "hardware/uart.h"
+#include "hardware/gpio.h"
+
+/** @brief Hardware UART instance used by this driver */
+#define UART_INST uart0
+
+void uart_driver_init(uint32_t tx_pin, uint32_t rx_pin, uint32_t baud_rate) {
+    uart_init(UART_INST, baud_rate);
+    gpio_set_function(tx_pin, GPIO_FUNC_UART);
+    gpio_set_function(rx_pin, GPIO_FUNC_UART);
+}
+
+bool uart_driver_is_readable(void) {
+    return uart_is_readable(UART_INST);
+}
+
+char uart_driver_getchar(void) {
+    return (char)uart_getc(UART_INST);
+}
+
+void uart_driver_putchar(char c) {
+    uart_putc_raw(UART_INST, c);
+}
+
+void uart_driver_puts(const char *str) {
+    while (*str) {
+        uart_putc_raw(UART_INST, *str++);
+    }
+}
+
+char uart_driver_to_upper(char c) {
+    if (c >= 'a' && c <= 'z') {
+        return (char)(c - 32);
+    }
+    return c;
+}
@@ -0,0 +1,100 @@
+/**
+ * @file uart.h
+ * @brief Header for hardware UART0 driver (raw TX/RX, GPIO 0/1)
+ * @author Kevin Thomas
+ * @date 2025
+ *
+ * MIT License
+ *
+ * Copyright (c) 2025 Kevin Thomas
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#ifndef UART_H
+#define UART_H
+
+#include <stdint.h>
+#include <stdbool.h>
+
+/**
+ * @brief Initialize hardware UART0 on the specified TX and RX GPIO pins
+ *
+ * Configures UART0 at the requested baud rate, sets the GPIO alternate
+ * functions for TX and RX, and enables 8N1 framing. Must be called once
+ * before using any other uart_driver_* functions.
+ *
+ * @param tx_pin   GPIO pin number to use as UART0 TX (typically 0)
+ * @param rx_pin   GPIO pin number to use as UART0 RX (typically 1)
+ * @param baud_rate Desired baud rate in bits per second (e.g. 115200)
+ */
+void uart_driver_init(uint32_t tx_pin, uint32_t rx_pin, uint32_t baud_rate);
+
+/**
+ * @brief Check whether a received character is waiting in the UART FIFO
+ *
+ * Returns immediately without blocking. Use this to poll for incoming
+ * data before calling uart_driver_getchar().
+ *
+ * @return bool true if at least one byte is available to read, false otherwise
+ */
+bool uart_driver_is_readable(void);
+
+/**
+ * @brief Read one character from UART0 (blocking)
+ *
+ * Blocks until a byte arrives in the receive FIFO, then returns it.
+ * Prefer pairing with uart_driver_is_readable() to avoid indefinite blocking.
+ *
+ * @return char The received character
+ */
+char uart_driver_getchar(void);
+
+/**
+ * @brief Transmit one character over UART0 (blocking)
+ *
+ * Waits until the transmit FIFO has space, then places the character into the
+ * FIFO. Returns once the byte has been accepted by the hardware.
+ *
+ * @param c Character to transmit
+ */
+void uart_driver_putchar(char c);
+
+/**
+ * @brief Transmit a null-terminated string over UART0
+ *
+ * Calls uart_driver_putchar() for every character in the string up to and
+ * not including the null terminator.
+ *
+ * @param str Pointer to the null-terminated ASCII string to send
+ */
+void uart_driver_puts(const char *str);
+
+/**
+ * @brief Convert a lowercase ASCII character to uppercase
+ *
+ * Returns the uppercase equivalent if the character is in 'a'-'z';
+ * all other characters are passed through unchanged.
+ *
+ * @param c Input character
+ * @return char Uppercase equivalent, or the original character
+ */
+char uart_driver_to_upper(char c);
+
+#endif // UART_H
@@ -0,0 +1,45 @@
+{
+    "configurations": [
+        {
+            "name": "ARM GCC",
+            "includePath": [
+                "${workspaceFolder}/Inc/**"
+            ],
+            "defines": [
+                "__GNUC__",
+                "__ARM_ARCH_8M_MAIN__",
+                "__ARMCC_VERSION"
+            ],
+            "compilerPath": "${userHome}/.pico-sdk/toolchain/14_2_Rel1/bin/arm-none-eabi-gcc",
+            "compileCommands": "${workspaceFolder}/compile_commands.json",
+            "cStandard": "c11",
+            "cppStandard": "c++17",
+            "intelliSenseMode": "gcc-arm",
+            "compilerArgs": [
+                "-mcpu=cortex-m33",
+                "-mthumb"
+            ]
+        },
+        {
+            "name": "ARM GCC (Windows)",
+            "includePath": [
+                "${workspaceFolder}/Inc/**"
+            ],
+            "defines": [
+                "__GNUC__",
+                "__ARM_ARCH_8M_MAIN__",
+                "__ARMCC_VERSION"
+            ],
+            "compilerPath": "${env:USERPROFILE}/.pico-sdk/toolchain/14_2_Rel1/bin/arm-none-eabi-gcc.exe",
+            "compileCommands": "${workspaceFolder}/compile_commands.json",
+            "cStandard": "c11",
+            "cppStandard": "c++17",
+            "intelliSenseMode": "gcc-arm",
+            "compilerArgs": [
+                "-mcpu=cortex-m33",
+                "-mthumb"
+            ]
+        }
+    ],
+    "version": 4
+}
@@ -0,0 +1,9 @@
+{
+    "recommendations": [
+        "marus25.cortex-debug",
+        "ms-vscode.cpptools",
+        "ms-vscode.cpptools-extension-pack",
+        "ms-vscode.vscode-serial-monitor",
+        "raspberry-pi.raspberry-pi-pico"
+    ]
+}
@@ -0,0 +1,47 @@
+{
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "Debug RP2350 (OpenOCD)",
+            "cwd": "${workspaceFolder}",
+            "executable": "${workspaceFolder}/build/uart.elf",
+            "request": "launch",
+            "type": "cortex-debug",
+            "servertype": "openocd",
+            "serverpath": "${userHome}/.pico-sdk/openocd/0.12.0+dev/openocd",
+            "searchDir": [
+                "${userHome}/.pico-sdk/openocd/0.12.0+dev/scripts"
+            ],
+            "gdbPath": "${userHome}/.pico-sdk/toolchain/14_2_Rel1/bin/arm-none-eabi-gdb",
+            "device": "RP2350",
+            "configFiles": [
+                "interface/cmsis-dap.cfg",
+                "target/rp2350.cfg"
+            ],
+            "svdFile": "${userHome}/.pico-sdk/sdk/2.2.0/src/rp2350/hardware_regs/RP2350.svd",
+            "overrideLaunchCommands": [
+                "set arch armv8-m.main",
+                "set output-radix 16",
+                "monitor reset init",
+                "load",
+                "monitor reset halt"
+            ],
+            "openOCDPreConfigLaunchCommands": [
+                "set USE_CORE { cm0 cm1 }"
+            ],
+            "openOCDLaunchCommands": [
+                "adapter speed 5000"
+            ],
+            "preLaunchTask": "Compile Project",
+            "showDevDebugOutput": "raw",
+            "windows": {
+                "serverpath": "${env:USERPROFILE}/.pico-sdk/openocd/0.12.0+dev/openocd.exe",
+                "searchDir": [
+                    "${env:USERPROFILE}/.pico-sdk/openocd/0.12.0+dev/scripts"
+                ],
+                "gdbPath": "${env:USERPROFILE}/.pico-sdk/toolchain/14_2_Rel1/bin/arm-none-eabi-gdb.exe",
+                "svdFile": "${env:USERPROFILE}/.pico-sdk/sdk/2.2.0/src/rp2350/hardware_regs/RP2350.svd"
+            }
+        }
+    ]
+}
@@ -0,0 +1,40 @@
+{
+    "cmake.showSystemKits": false,
+    "cmake.options.statusBarVisibility": "hidden",
+    "cmake.options.advanced": {
+        "build": {
+            "statusBarVisibility": "hidden"
+        },
+        "launch": {
+            "statusBarVisibility": "hidden"
+        },
+        "debug": {
+            "statusBarVisibility": "hidden"
+        }
+    },
+    "cmake.configureOnEdit": false,
+    "cmake.automaticReconfigure": false,
+    "cmake.configureOnOpen": false,
+    "cmake.generator": "Ninja",
+    "cmake.cmakePath": "${userHome}/.pico-sdk/cmake/v3.31.5/bin/cmake",
+    "C_Cpp.debugShortcut": false,
+    "terminal.integrated.env.windows": {
+        "PICO_SDK_PATH": "${env:USERPROFILE}/.pico-sdk/sdk/2.2.0",
+        "PICO_TOOLCHAIN_PATH": "${env:USERPROFILE}/.pico-sdk/toolchain/14_2_Rel1",
+        "Path": "${env:USERPROFILE}/.pico-sdk/toolchain/14_2_Rel1/bin;${env:USERPROFILE}/.pico-sdk/picotool/2.2.0-a4/picotool;${env:USERPROFILE}/.pico-sdk/cmake/v3.31.5/bin;${env:USERPROFILE}/.pico-sdk/ninja/v1.12.1;${env:PATH}"
+    },
+    "terminal.integrated.env.osx": {
+        "PICO_SDK_PATH": "${env:HOME}/.pico-sdk/sdk/2.2.0",
+        "PICO_TOOLCHAIN_PATH": "${env:HOME}/.pico-sdk/toolchain/14_2_Rel1",
+        "PATH": "${env:HOME}/.pico-sdk/toolchain/14_2_Rel1/bin:${env:HOME}/.pico-sdk/picotool/2.2.0-a4/picotool:${env:HOME}/.pico-sdk/cmake/v3.31.5/bin:${env:HOME}/.pico-sdk/ninja/v1.12.1:${env:PATH}"
+    },
+    "terminal.integrated.env.linux": {
+        "PICO_SDK_PATH": "${env:HOME}/.pico-sdk/sdk/2.2.0",
+        "PICO_TOOLCHAIN_PATH": "${env:HOME}/.pico-sdk/toolchain/14_2_Rel1",
+        "PATH": "${env:HOME}/.pico-sdk/toolchain/14_2_Rel1/bin:${env:HOME}/.pico-sdk/picotool/2.2.0-a4/picotool:${env:HOME}/.pico-sdk/cmake/v3.31.5/bin:${env:HOME}/.pico-sdk/ninja/v1.12.1:${env:PATH}"
+    },
+    "raspberry-pi-pico.cmakeAutoConfigure": true,
+    "raspberry-pi-pico.useCmakeTools": false,
+    "raspberry-pi-pico.cmakePath": "${HOME}/.pico-sdk/cmake/v3.31.5/bin/cmake",
+    "raspberry-pi-pico.ninjaPath": "${HOME}/.pico-sdk/ninja/v1.12.1/ninja"
+}
@@ -0,0 +1,128 @@
+{
+    "version": "2.0.0",
+    "tasks": [
+        {
+            "label": "Compile Project",
+            "type": "shell",
+            "command": "make",
+            "group": {
+                "kind": "build",
+                "isDefault": true
+            },
+            "presentation": {
+                "reveal": "always",
+                "panel": "dedicated"
+            },
+            "problemMatcher": "$gcc",
+            "windows": {
+                "command": ".\\build.bat"
+            }
+        },
+        {
+            "label": "Clean Project",
+            "type": "shell",
+            "command": "make clean",
+            "group": "build",
+            "presentation": {
+                "reveal": "always",
+                "panel": "dedicated"
+            },
+            "problemMatcher": [],
+            "windows": {
+                "command": ".\\clean.bat"
+            }
+        },
+        {
+            "label": "Run Project",
+            "type": "shell",
+            "command": "${userHome}/.pico-sdk/picotool/2.2.0-a4/picotool/picotool",
+            "args": [
+                "load",
+                "build/uart.uf2",
+                "-fx"
+            ],
+            "presentation": {
+                "reveal": "always",
+                "panel": "dedicated"
+            },
+            "problemMatcher": [],
+            "dependsOn": [
+                "Compile Project"
+            ],
+            "windows": {
+                "command": "${env:USERPROFILE}/.pico-sdk/picotool/2.2.0-a4/picotool/picotool.exe"
+            }
+        },
+        {
+            "label": "Flash",
+            "type": "shell",
+            "command": "${userHome}/.pico-sdk/openocd/0.12.0+dev/openocd",
+            "args": [
+                "-s",
+                "${userHome}/.pico-sdk/openocd/0.12.0+dev/scripts",
+                "-f",
+                "interface/cmsis-dap.cfg",
+                "-f",
+                "target/rp2350.cfg",
+                "-c",
+                "adapter speed 5000; program build/uart.elf verify reset exit"
+            ],
+            "problemMatcher": [],
+            "dependsOn": [
+                "Compile Project"
+            ],
+            "windows": {
+                "command": "${env:USERPROFILE}/.pico-sdk/openocd/0.12.0+dev/openocd.exe"
+            }
+        },
+        {
+            "label": "Rescue Reset",
+            "type": "process",
+            "command": "${userHome}/.pico-sdk/openocd/0.12.0+dev/openocd",
+            "args": [
+                "-s",
+                "${userHome}/.pico-sdk/openocd/0.12.0+dev/scripts",
+                "-f",
+                "interface/cmsis-dap.cfg",
+                "-f",
+                "target/${command:raspberry-pi-pico.getChip}-rescue.cfg",
+                "-c",
+                "adapter speed 5000; reset halt; exit"
+            ],
+            "problemMatcher": [],
+            "windows": {
+                "command": "${env:USERPROFILE}/.pico-sdk/openocd/0.12.0+dev/openocd.exe"
+            }
+        },
+        {
+            "label": "RISC-V Reset (RP2350)",
+            "type": "process",
+            "command": "${userHome}/.pico-sdk/openocd/0.12.0+dev/openocd",
+            "args": [
+                "-s",
+                "${userHome}/.pico-sdk/openocd/0.12.0+dev/scripts",
+                "-c",
+                "set USE_CORE { rv0 rv1 cm0 cm1 }",
+                "-f",
+                "interface/cmsis-dap.cfg",
+                "-f",
+                "target/rp2350.cfg",
+                "-c",
+                "adapter speed 5000; init;",
+                "-c",
+                "write_memory 0x40120158 8 { 0x3 }; echo [format \"Info : ARCHSEL 0x%02x\" [read_memory 0x40120158 8 1]];",
+                "-c",
+                "reset halt; targets rp2350.rv0; echo [format \"Info : ARCHSEL_STATUS 0x%02x\" [read_memory 0x4012015C 8 1]]; exit"
+            ],
+            "problemMatcher": [],
+            "windows": {
+                "command": "${env:USERPROFILE}/.pico-sdk/openocd/0.12.0+dev/openocd.exe"
+            }
+        }
+    ]
+}
+],
+"problemMatcher": []
+}
+]
+}
@@ -0,0 +1,203 @@
+/**
+ * @file rp2350.h
+ * @brief RP2350 Device Peripheral Access Layer Header File.
+ * @author Kevin Thomas
+ * @date 2026
+ *
+ * Memory-mapped register structures and peripheral base addresses
+ * for the RP2350 microcontroller (Cortex-M33 dual-core). All
+ * register offsets verified against the RP2350 datasheet
+ * (RP-008373-DS-2).
+ *
+ * MIT License
+ *
+ * Copyright (c) 2026 Kevin Thomas
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#ifndef __RP2350_H
+#define __RP2350_H
+
+#include <stdint.h>
+#include <stdbool.h>
+
+/*!< Defines 'read / write' permissions */
+#define __IO volatile
+
+/*!< Stack addresses */
+#define STACK_TOP              0x20082000UL
+#define STACK_LIMIT            0x2007A000UL
+
+/*!< Memory map */
+#define XIP_BASE               0x10000000UL
+#define SRAM_BASE              0x20000000UL
+#define SIO_BASE               0xD0000000UL
+#define PPB_BASE               0xE0000000UL
+
+/*!< APB peripherals */
+#define CLOCKS_BASE            0x40010000UL
+#define RESETS_BASE            0x40020000UL
+#define IO_BANK0_BASE          0x40028000UL
+#define PADS_BANK0_BASE        0x40038000UL
+#define XOSC_BASE              0x40048000UL
+#define UART0_BASE             0x40070000UL
+
+/**
+  * @brief XOSC (External Crystal Oscillator)
+  */
+typedef struct
+{
+  __IO uint32_t CTRL;          // Control register                               Address offset: 0x00
+  __IO uint32_t STATUS;        // Status register                                Address offset: 0x04
+  __IO uint32_t DORMANT;       // Dormant mode                                   Address offset: 0x08
+  __IO uint32_t STARTUP;       // Startup delay                                  Address offset: 0x0C
+  __IO uint32_t COUNT;         // Frequency count                                Address offset: 0x10
+} XOSC_TypeDef;
+
+/**
+  * @brief CLOCKS
+  */
+typedef struct
+{
+  __IO uint32_t RESERVED0[18]; // Other clock registers                          Address offset: 0x00-0x44
+  __IO uint32_t CLK_PERI_CTRL; // Peripheral clock control                       Address offset: 0x48
+} CLOCKS_TypeDef;
+
+/**
+  * @brief RESETS
+  */
+typedef struct
+{
+  __IO uint32_t RESET;         // Reset control                                  Address offset: 0x00
+  __IO uint32_t WDSEL;         // Watchdog select                                Address offset: 0x04
+  __IO uint32_t RESET_DONE;    // Reset done status                              Address offset: 0x08
+} RESETS_TypeDef;
+
+/**
+  * @brief IO_BANK0 GPIO Control (one per GPIO)
+  */
+typedef struct
+{
+  __IO uint32_t STATUS;        // GPIO status                                    Address offset: 0x00
+  __IO uint32_t CTRL;          // GPIO control                                   Address offset: 0x04
+} IO_BANK0_GPIO_TypeDef;
+
+/**
+  * @brief IO_BANK0
+  */
+typedef struct
+{
+  IO_BANK0_GPIO_TypeDef GPIO[30]; // GPIO 0-29 status/ctrl pairs                 Address offset: 0x000-0x0E8
+} IO_BANK0_TypeDef;
+
+/**
+  * @brief PADS_BANK0
+  */
+typedef struct
+{
+  __IO uint32_t VOLTAGE_SELECT; // Voltage select                                Address offset: 0x00
+  __IO uint32_t GPIO[30];      // GPIO 0-29 pad control                          Address offset: 0x04-0x78
+} PADS_BANK0_TypeDef;
+
+/**
+  * @brief Peripheral Definitions
+  */
+#define XOSC                   ((XOSC_TypeDef *) XOSC_BASE)
+#define CLOCKS                 ((CLOCKS_TypeDef *) CLOCKS_BASE)
+#define RESETS                 ((RESETS_TypeDef *) RESETS_BASE)
+#define IO_BANK0               ((IO_BANK0_TypeDef *) IO_BANK0_BASE)
+#define PADS_BANK0             ((PADS_BANK0_TypeDef *) PADS_BANK0_BASE)
+#define SIO                    ((volatile uint32_t *) SIO_BASE)
+#define CPACR                  ((volatile uint32_t *) (PPB_BASE + 0x0ED88UL))
+
+/**
+  * @brief XOSC bit definitions
+  */
+#define XOSC_STATUS_STABLE_SHIFT     31U
+
+/**
+  * @brief CPACR bit definitions
+  */
+#define CPACR_CP0_SHIFT              0U
+#define CPACR_CP1_SHIFT              1U
+
+/**
+  * @brief CLOCKS bit definitions
+  */
+#define CLK_PERI_CTRL_ENABLE_SHIFT   11U
+#define CLK_PERI_CTRL_AUXSRC_SHIFT   5U
+#define CLK_PERI_CTRL_AUXSRC_XOSC   4U
+
+/**
+  * @brief RESETS bit definitions
+  */
+#define RESETS_RESET_IO_BANK0_SHIFT  6U
+#define RESETS_RESET_UART0_SHIFT     26U
+
+/**
+  * @brief IO_BANK0 bit definitions
+  */
+#define IO_BANK0_CTRL_FUNCSEL_MASK   0x1FU
+#define IO_BANK0_CTRL_FUNCSEL_UART   0x02U
+#define IO_BANK0_CTRL_FUNCSEL_SIO    0x05U
+
+/**
+  * @brief PADS_BANK0 bit definitions
+  */
+#define PADS_BANK0_OD_SHIFT          7U
+#define PADS_BANK0_IE_SHIFT          6U
+#define PADS_BANK0_ISO_SHIFT         8U
+
+/**
+  * @brief UART register offsets (word indices from UART0_BASE)
+  */
+#define UART_DR_OFFSET               (0x000U / 4U)
+#define UART_FR_OFFSET               (0x018U / 4U)
+#define UART_IBRD_OFFSET             (0x024U / 4U)
+#define UART_FBRD_OFFSET             (0x028U / 4U)
+#define UART_LCR_H_OFFSET           (0x02CU / 4U)
+#define UART_CR_OFFSET               (0x030U / 4U)
+
+/**
+  * @brief UART flag register bit definitions
+  */
+#define UART_FR_TXFF_MASK            32U
+#define UART_FR_RXFE_MASK            16U
+
+/**
+  * @brief UART line control and enable values
+  */
+#define UART_LCR_H_8N1_FIFO         0x70U
+#define UART_CR_ENABLE               ((3U << 8) | 1U)
+
+/**
+  * @brief GPIO pin definitions
+  */
+#define LED_PIN                      25U
+
+/**
+  * @brief SIO GPIO register offsets (word indices from SIO_BASE)
+  */
+#define SIO_GPIO_IN_OFFSET           (0x004U / 4U)
+#define SIO_GPIO_OUT_SET_OFFSET      (0x018U / 4U)
+#define SIO_GPIO_OUT_CLR_OFFSET      (0x020U / 4U)
+#define SIO_GPIO_OUT_XOR_OFFSET      (0x028U / 4U)
+#define SIO_GPIO_OE_SET_OFFSET       (0x038U / 4U)
+
+#endif /* __RP2350_H */
@@ -0,0 +1,42 @@
+/**
+ * @file rp2350_reset.h
+ * @brief Reset controller driver header for RP2350.
+ * @author Kevin Thomas
+ * @date 2026
+ *
+ * Provides subsystem reset release for IO_BANK0.
+ *
+ * MIT License
+ *
+ * Copyright (c) 2026 Kevin Thomas
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#ifndef __RP2350_RESET_H
+#define __RP2350_RESET_H
+
+#include "rp2350.h"
+
+/**
+  * @brief  Release IO_BANK0 from reset and wait until ready.
+  * @retval None
+  */
+void reset_init_subsystem(void);
+
+#endif /* __RP2350_RESET_H */
@@ -0,0 +1,42 @@
+/**
+ * @file rp2350_reset_handler.h
+ * @brief Reset handler header for RP2350.
+ * @author Kevin Thomas
+ * @date 2026
+ *
+ * Entry point after reset. Performs stack initialization, XOSC
+ * setup, subsystem reset release, UART initialization,
+ * and branches to main().
+ *
+ * MIT License
+ *
+ * Copyright (c) 2026 Kevin Thomas
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#ifndef __RP2350_RESET_HANDLER_H
+#define __RP2350_RESET_HANDLER_H
+
+/**
+  * @brief  Reset handler entry point (naked, noreturn).
+  * @retval None
+  */
+void Reset_Handler(void) __attribute__((noreturn));
+
+#endif /* __RP2350_RESET_HANDLER_H */
@@ -0,0 +1,43 @@
+/**
+ * @file rp2350_stack.h
+ * @brief Stack pointer initialization header for RP2350.
+ * @author Kevin Thomas
+ * @date 2026
+ *
+ * Sets MSP, PSP, MSPLIM, and PSPLIM from the STACK_TOP and
+ * STACK_LIMIT values defined in rp2350.h.
+ *
+ * MIT License
+ *
+ * Copyright (c) 2026 Kevin Thomas
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#ifndef __RP2350_STACK_H
+#define __RP2350_STACK_H
+
+#include "rp2350.h"
+
+/**
+  * @brief  Initialize MSP, PSP, MSPLIM, and PSPLIM stack pointers.
+  * @retval None
+  */
+void stack_init(void);
+
+#endif /* __RP2350_STACK_H */
@@ -0,0 +1,82 @@
+/**
+ * @file rp2350_uart.h
+ * @brief UART0 driver header for RP2350.
+ * @author Kevin Thomas
+ * @date 2026
+ *
+ * Bare-metal UART0 driver supporting TX/RX on GPIO 0/1 at
+ * 115200 baud (12 MHz XOSC clock).
+ *
+ * MIT License
+ *
+ * Copyright (c) 2026 Kevin Thomas
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#ifndef __RP2350_UART_H
+#define __RP2350_UART_H
+
+#include "rp2350.h"
+
+/**
+  * @brief  Release UART0 from reset and wait until ready.
+  * @retval None
+  */
+void uart_release_reset(void);
+
+/**
+  * @brief  Initialize UART0 pins, baud rate, line control, and enable.
+  * @retval None
+  */
+void uart_init(void);
+
+/**
+  * @brief  Check whether a received byte is waiting in the UART FIFO.
+  * @retval bool true if at least one byte is available
+  */
+bool uart_is_readable(void);
+
+/**
+  * @brief  Read one character from UART0 (blocking).
+  * @retval char the received character
+  */
+char uart_getchar(void);
+
+/**
+  * @brief  Transmit one character over UART0 (blocking).
+  * @param  c character to transmit
+  * @retval None
+  */
+void uart_putchar(char c);
+
+/**
+  * @brief  Transmit a null-terminated string over UART0.
+  * @param  str pointer to the string to send
+  * @retval None
+  */
+void uart_puts(const char *str);
+
+/**
+  * @brief  Convert a lowercase ASCII character to uppercase.
+  * @param  c input character
+  * @retval char uppercase equivalent or original character
+  */
+char uart_to_upper(char c);
+
+#endif /* __RP2350_UART_H */
@@ -0,0 +1,49 @@
+/**
+ * @file rp2350_xosc.h
+ * @brief XOSC driver header for RP2350.
+ * @author Kevin Thomas
+ * @date 2026
+ *
+ * External crystal oscillator initialization and peripheral
+ * clock enable using the XOSC registers.
+ *
+ * MIT License
+ *
+ * Copyright (c) 2026 Kevin Thomas
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#ifndef __RP2350_XOSC_H
+#define __RP2350_XOSC_H
+
+#include "rp2350.h"
+
+/**
+  * @brief  Initialize the external crystal oscillator and wait until stable.
+  * @retval None
+  */
+void xosc_init(void);
+
+/**
+  * @brief  Enable the XOSC peripheral clock via CLK_PERI_CTRL.
+  * @retval None
+  */
+void xosc_enable_peri_clk(void);
+
+#endif /* __RP2350_XOSC_H */
@@ -0,0 +1,83 @@
+# ------------------------------------------------------------------------------
+# @file    Makefile
+# @author  Kevin Thomas
+# @brief   Build script for RP2350 bare-metal C UART driver.
+#
+#          Compiles, links, and generates UF2 firmware for the RP2350.
+# ------------------------------------------------------------------------------
+
+# OS detection
+ifeq ($(OS),Windows_NT)
+  MKDIR = if not exist $(subst /,\\,$(BUILD_DIR)) mkdir $(subst /,\\,$(BUILD_DIR))
+  RM    = if exist $(subst /,\\,$(BUILD_DIR)) rmdir /s /q $(subst /,\\,$(BUILD_DIR))
+else
+  MKDIR = mkdir -p $(BUILD_DIR)
+  RM    = rm -rf $(BUILD_DIR)
+endif
+
+# Toolchain
+CC      = arm-none-eabi-gcc
+OBJCOPY = arm-none-eabi-objcopy
+SIZE    = arm-none-eabi-size
+
+# Target
+TARGET  = uart
+
+# Directories
+SRC_DIR  = Src
+INC_DIR  = Inc
+BUILD_DIR = build
+
+# CPU flags
+CPU_FLAGS = -mcpu=cortex-m33 -mthumb
+
+# Compiler flags
+CFLAGS  = $(CPU_FLAGS) -Og -g3 -Wall -Wextra \
+          -ffunction-sections -fdata-sections \
+          -I$(INC_DIR)
+
+# Linker flags
+LDFLAGS = $(CPU_FLAGS) -T linker.ld -nostdlib -Wl,--gc-sections
+
+# Source files
+SRCS = $(SRC_DIR)/vector_table.c \
+       $(SRC_DIR)/rp2350_reset_handler.c \
+       $(SRC_DIR)/rp2350_stack.c \
+       $(SRC_DIR)/rp2350_xosc.c \
+       $(SRC_DIR)/rp2350_reset.c \
+       $(SRC_DIR)/rp2350_uart.c \
+       $(SRC_DIR)/main.c \
+       $(SRC_DIR)/image_def.c
+
+# Object files
+OBJS = $(patsubst $(SRC_DIR)/%.c,$(BUILD_DIR)/%.o,$(SRCS))
+
+# Rules
+.PHONY: all clean flash
+
+all: $(BUILD_DIR)/$(TARGET).bin
+	@echo "==================================="
+	@echo "SUCCESS! Created $(TARGET).elf and $(TARGET).bin"
+	@echo "==================================="
+
+$(BUILD_DIR)/%.o: $(SRC_DIR)/%.c | $(BUILD_DIR)
+	$(CC) $(CFLAGS) -c $< -o $@
+
+$(BUILD_DIR)/$(TARGET).elf: $(OBJS)
+	$(CC) $(LDFLAGS) $(OBJS) -o $@
+	$(SIZE) $@
+
+$(BUILD_DIR)/$(TARGET).bin: $(BUILD_DIR)/$(TARGET).elf
+	$(OBJCOPY) -O binary $< $@
+
+
+$(BUILD_DIR):
+	$(MKDIR)
+
+clean:
+	$(RM)
+
+flash: $(BUILD_DIR)/$(TARGET).elf
+	openocd -f interface/cmsis-dap.cfg -f target/rp2350.cfg \
+	  -c "adapter speed 5000" \
+	  -c "program $< verify reset exit"
@@ -0,0 +1,41 @@
+/**
+ * @file image_def.c
+ * @brief RP2350 IMAGE_DEF block for boot ROM image recognition.
+ * @author Kevin Thomas
+ * @date 2026
+ *
+ * Must appear within the first 4 KB of flash for the boot ROM
+ * to accept the image.
+ *
+ * MIT License
+ *
+ * Copyright (c) 2026 Kevin Thomas
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#include <stdint.h>
+
+__attribute__((section(".embedded_block"), used))
+const uint8_t picobin_block[] = {
+  0xD3, 0xDE, 0xFF, 0xFF,
+  0x42, 0x01, 0x21, 0x10,
+  0xFF, 0x01, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00,
+  0x79, 0x35, 0x12, 0xAB
+};
@@ -0,0 +1,53 @@
+/**
+ * @file main.c
+ * @brief UART demonstration: echo received characters in uppercase.
+ * @author Kevin Thomas
+ * @date 2026
+ *
+ * Demonstrates hardware UART0 using the bare-metal UART driver.
+ * Characters typed into a terminal via a USB-to-UART adapter
+ * are echoed back in uppercase.
+ *
+ * Wiring:
+ *  GPIO0 (TX) -> USB-to-UART adapter RX
+ *  GPIO1 (RX) -> USB-to-UART adapter TX
+ *  GND        -> USB-to-UART adapter GND
+ *
+ * MIT License
+ *
+ * Copyright (c) 2026 Kevin Thomas
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#include "rp2350_uart.h"
+
+int main(void)
+{
+  uart_puts("UART driver ready (115200 8N1)\r\n");
+  uart_puts("Type characters to echo them back in UPPERCASE:\r\n");
+  while (1) 
+  {
+    if (uart_is_readable()) 
+    {
+      char c = uart_getchar();
+      char upper = uart_to_upper(c);
+      uart_putchar(upper);
+    }
+  }
+}
@@ -0,0 +1,41 @@
+/**
+ * @file rp2350_reset.c
+ * @brief Reset controller driver implementation for RP2350.
+ * @author Kevin Thomas
+ * @date 2026
+ *
+ * Releases IO_BANK0 from reset and waits until the subsystem
+ * is ready.
+ *
+ * MIT License
+ *
+ * Copyright (c) 2026 Kevin Thomas
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#include "rp2350_reset.h"
+
+void reset_init_subsystem(void)
+{
+  uint32_t value;
+  value = RESETS->RESET;
+  value &= ~(1U << RESETS_RESET_IO_BANK0_SHIFT);
+  RESETS->RESET = value;
+  while ((RESETS->RESET_DONE & (1U << RESETS_RESET_IO_BANK0_SHIFT)) == 0) {}
+}
@@ -0,0 +1,80 @@
+/**
+ * @file rp2350_reset_handler.c
+ * @brief Reset handler implementation for RP2350.
+ * @author Kevin Thomas
+ * @date 2026
+ *
+ * Entry point after power-on or system reset. Initializes the
+ * stack, XOSC, subsystem resets, UART, then branches
+ * to main().
+ *
+ * MIT License
+ *
+ * Copyright (c) 2026 Kevin Thomas
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#include "rp2350_reset_handler.h"
+#include "rp2350_stack.h"
+#include "rp2350_xosc.h"
+#include "rp2350_reset.h"
+#include "rp2350_uart.h"
+
+extern int main(void);
+
+extern uint32_t __data_lma;
+extern uint32_t __data_start;
+extern uint32_t __data_end;
+extern uint32_t __bss_start;
+extern uint32_t __bss_end;
+
+static void _data_copy_init(void)
+{
+  uint32_t *src = &__data_lma;
+  uint32_t *dst = &__data_start;
+  while (dst < &__data_end)
+    *dst++ = *src++;
+}
+
+static void _bss_zero_init(void)
+{
+  uint32_t *dst = &__bss_start;
+  while (dst < &__bss_end)
+    *dst++ = 0U;
+}
+
+void _ram_init(void)
+{
+  stack_init();
+  _data_copy_init();
+  _bss_zero_init();
+}
+
+void __attribute__((naked, noreturn)) Reset_Handler(void)
+{
+  __asm__ volatile (
+    "bl _ram_init\n\t"
+    "bl xosc_init\n\t"
+    "bl xosc_enable_peri_clk\n\t"
+    "bl reset_init_subsystem\n\t"
+    "bl uart_release_reset\n\t"
+    "bl uart_init\n\t"
+    "b main\n\t"
+  );
+}
@@ -0,0 +1,47 @@
+/**
+ * @file rp2350_stack.c
+ * @brief Stack pointer initialization for RP2350.
+ * @author Kevin Thomas
+ * @date 2026
+ *
+ * Sets MSP, PSP, MSPLIM, and PSPLIM using inline assembly.
+ *
+ * MIT License
+ *
+ * Copyright (c) 2026 Kevin Thomas
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#include "rp2350_stack.h"
+
+void stack_init(void)
+{
+  __asm__ volatile (
+    "ldr   r0, =%0\n\t"
+    "msr   PSP, r0\n\t"
+    "ldr   r0, =%1\n\t"
+    "msr   MSPLIM, r0\n\t"
+    "msr   PSPLIM, r0\n\t"
+    "ldr   r0, =%0\n\t"
+    "msr   MSP, r0\n\t"
+    :
+    : "i" (STACK_TOP), "i" (STACK_LIMIT)
+    : "r0"
+  );
+}
@@ -0,0 +1,134 @@
+/**
+ * @file rp2350_uart.c
+ * @brief UART0 driver implementation for RP2350.
+ * @author Kevin Thomas
+ * @date 2026
+ *
+ * Configures UART0 on GPIO 0 (TX) and GPIO 1 (RX) at 115200
+ * baud using the 12 MHz XOSC clock.
+ *
+ * MIT License
+ *
+ * Copyright (c) 2026 Kevin Thomas
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#include "rp2350_uart.h"
+
+/** @brief Base address pointer for UART0 peripheral registers */
+#define UART_BASE ((volatile uint32_t *) UART0_BASE)
+
+/**
+  * @brief  Clear the UART0 reset bit in the reset controller.
+  * @retval None
+  */
+static void uart_clear_reset_bit(void)
+{
+  uint32_t value;
+  value = RESETS->RESET;
+  value &= ~(1U << RESETS_RESET_UART0_SHIFT);
+  RESETS->RESET = value;
+}
+
+/**
+  * @brief  Wait until the UART0 block is out of reset.
+  * @retval None
+  */
+static void uart_wait_reset_done(void)
+{
+  while ((RESETS->RESET_DONE & (1U << RESETS_RESET_UART0_SHIFT)) == 0) {}
+}
+
+/**
+  * @brief  Configure GPIO pins 0 (TX) and 1 (RX) for UART function.
+  * @retval None
+  */
+static void uart_configure_pins(void)
+{
+  IO_BANK0->GPIO[0].CTRL = IO_BANK0_CTRL_FUNCSEL_UART;
+  IO_BANK0->GPIO[1].CTRL = IO_BANK0_CTRL_FUNCSEL_UART;
+  PADS_BANK0->GPIO[0] = 0x04;
+  PADS_BANK0->GPIO[1] = 0x40;
+}
+
+/**
+  * @brief  Set UART0 baud rate divisors for 115200 at 12 MHz.
+  * @retval None
+  */
+static void uart_set_baud(void)
+{
+  UART_BASE[UART_CR_OFFSET] = 0;
+  UART_BASE[UART_IBRD_OFFSET] = 6;
+  UART_BASE[UART_FBRD_OFFSET] = 33;
+}
+
+/**
+  * @brief  Configure line control and enable UART0.
+  * @retval None
+  */
+static void uart_enable(void)
+{
+  UART_BASE[UART_LCR_H_OFFSET] = UART_LCR_H_8N1_FIFO;
+  UART_BASE[UART_CR_OFFSET] = UART_CR_ENABLE;
+}
+
+void uart_release_reset(void)
+{
+  uart_clear_reset_bit();
+  uart_wait_reset_done();
+}
+
+void uart_init(void)
+{
+  uart_configure_pins();
+  uart_set_baud();
+  uart_enable();
+}
+
+bool uart_is_readable(void)
+{
+  return (UART_BASE[UART_FR_OFFSET] & UART_FR_RXFE_MASK) == 0;
+}
+
+char uart_getchar(void)
+{
+  while (UART_BASE[UART_FR_OFFSET] & UART_FR_RXFE_MASK) {}
+  return (char)(UART_BASE[UART_DR_OFFSET] & 0xFF);
+}
+
+void uart_putchar(char c)
+{
+  while (UART_BASE[UART_FR_OFFSET] & UART_FR_TXFF_MASK) {}
+  UART_BASE[UART_DR_OFFSET] = (uint32_t)c;
+}
+
+void uart_puts(const char *str)
+{
+  while (*str) 
+  {
+    uart_putchar(*str++);
+  }
+}
+
+char uart_to_upper(char c)
+{
+  if (c >= 'a' && c <= 'z')
+    return (char)(c - 32);
+  return c;
+}
@@ -0,0 +1,48 @@
+/**
+ * @file rp2350_xosc.c
+ * @brief XOSC driver implementation for RP2350.
+ * @author Kevin Thomas
+ * @date 2026
+ *
+ * Configures the external crystal oscillator and enables the
+ * peripheral clock sourced from XOSC.
+ *
+ * MIT License
+ *
+ * Copyright (c) 2026 Kevin Thomas
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#include "rp2350_xosc.h"
+
+void xosc_init(void)
+{
+  XOSC->STARTUP = 0x00C4U;
+  XOSC->CTRL = 0x00FABAA0U;
+  while ((XOSC->STATUS & (1U << XOSC_STATUS_STABLE_SHIFT)) == 0) {}
+}
+
+void xosc_enable_peri_clk(void)
+{
+  uint32_t value;
+  value = CLOCKS->CLK_PERI_CTRL;
+  value |= (1U << CLK_PERI_CTRL_ENABLE_SHIFT);
+  value |= (CLK_PERI_CTRL_AUXSRC_XOSC << CLK_PERI_CTRL_AUXSRC_SHIFT);
+  CLOCKS->CLK_PERI_CTRL = value;
+}
@@ -0,0 +1,44 @@
+/**
+ * @file vector_table.c
+ * @brief Vector table with initial stack pointer and reset handler.
+ * @author Kevin Thomas
+ * @date 2026
+ *
+ * Placed in the .vectors section at the start of flash.
+ * The Thumb bit (bit 0 = 1) is automatically set by the
+ * linker for function pointers in Thumb mode.
+ *
+ * MIT License
+ *
+ * Copyright (c) 2026 Kevin Thomas
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#include <stdint.h>
+
+extern uint32_t _stack_top;
+extern void Reset_Handler(void);
+
+typedef void (*vector_func_t)(void);
+
+__attribute__((section(".vectors"), used))
+const void *_vectors[2] = {
+  &_stack_top,
+  Reset_Handler
+};
@@ -0,0 +1,144 @@
+/**
+  ******************************************************************************
+  * @file    linker.ld
+  * @author  Kevin Thomas
+  * @brief   Minimal linker script for bare-metal RP2350 development.
+  *
+  *          Defines FLASH (XIP 32 MB) and RAM (520 kB SRAM) regions.
+  *          The vector table is placed at the start of flash (0x10000000).
+  *
+  ******************************************************************************
+  * @attention
+  *
+  * Copyright (c) 2026 Kevin Thomas.
+  * All rights reserved.
+  *
+  * This software is licensed under terms that can be found in the LICENSE file
+  * in the root directory of this software component.
+  * If no LICENSE file comes with this software, it is provided AS-IS.
+  *
+  ******************************************************************************
+  */
+
+/**
+  * Entry point.
+  */
+ENTRY(Reset_Handler)
+
+/**
+  * Define memory regions.
+  */
+__XIP_BASE   = 0x10000000;
+__XIP_SIZE   = 32M;
+
+__SRAM_BASE  = 0x20000000;
+__SRAM_SIZE  = 520K;
+__STACK_SIZE = 32K;
+
+/**
+  * Memory layout.
+  */
+MEMORY
+{
+  RAM   (rwx) : ORIGIN = __SRAM_BASE, LENGTH = __SRAM_SIZE
+  FLASH (rx)  : ORIGIN = __XIP_BASE,  LENGTH = __XIP_SIZE
+}
+
+/**
+  * Program headers.
+  */
+PHDRS
+{
+  text PT_LOAD FLAGS(5);
+  data PT_LOAD FLAGS(6);
+}
+
+/**
+  * Section placement.
+  */
+SECTIONS
+{
+  . = ORIGIN(FLASH);
+
+  /**
+    * Vector table MUST be first at 0x10000000.
+    */
+  .vectors :
+  {
+    KEEP(*(.vectors))
+  } > FLASH :text
+
+  /**
+    * Verify vector table placement.
+    */
+  ASSERT((ADDR(.vectors) == ORIGIN(FLASH)),
+         "Vector table must be at start of flash (0x10000000)")
+
+  /**
+    * Text and read-only data.
+    */
+  .text :
+  {
+    . = ALIGN(4);
+    *(.text*)
+    *(.rodata*)
+    KEEP(*(.init))
+    KEEP(*(.fini))
+    KEEP(*(.ARM.attributes))
+  } > FLASH :text
+
+  /**
+    * IMAGE_DEF block at end of code.
+    */
+  .embedded_block :
+  {
+    KEEP(*(.embedded_block))
+  } > FLASH :text
+
+  /**
+    * Initialized data and RAM-resident code (LMA in flash, VMA in RAM).
+    * Startup copies from __data_lma to __data_start..__data_end.
+    */
+  .data :
+  {
+    . = ALIGN(4);
+    __data_start = .;
+    *(.ram_func*)
+    *(.data*)
+    . = ALIGN(4);
+    __data_end = .;
+  } > RAM AT> FLASH :data
+
+    __data_lma = LOADADDR(.data);
+
+  /**
+    * Uninitialized data (BSS) in RAM.
+    */
+  .bss (NOLOAD) :
+  {
+    . = ALIGN(4);
+    __bss_start = .;
+    *(.bss*)
+    *(COMMON)
+    . = ALIGN(4);
+    __bss_end = .;
+  } > RAM
+
+  /**
+    * Non-secure stack symbols.
+    */
+  __StackTop   = ORIGIN(RAM) + LENGTH(RAM);
+  __StackLimit = __StackTop - __STACK_SIZE;
+  __stack      = __StackTop;
+  _stack_top   = __StackTop;
+
+  /**
+    * Stack section (no load).
+    */
+  .stack (NOLOAD) : { . = ALIGN(8); } > RAM
+
+  /**
+    * Provide vector table symbol to startup code.
+    */
+  PROVIDE(__Vectors = ADDR(.vectors));
+}
@@ -0,0 +1,102 @@
+# SPDX-License-Identifier: MIT OR Apache-2.0
+#
+# Copyright (c) 2021–2024 The rp-rs Developers
+# Copyright (c) 2021 rp-rs organization
+# Copyright (c) 2025 Raspberry Pi Ltd.
+#
+# Cargo Configuration for the https://github.com/rp-rs/rp-hal.git repository.
+#
+# You might want to make a similar file in your own repository if you are
+# writing programs for Raspberry Silicon microcontrollers.
+#
+
+[build]
+target = "thumbv8m.main-none-eabihf"
+# Set the default target to match the Cortex-M33 in the RP2350
+# target = "thumbv8m.main-none-eabihf"
+# target = "thumbv6m-none-eabi"
+# target = "riscv32imac-unknown-none-elf"
+
+# Target specific options
+[target.thumbv6m-none-eabi]
+# Pass some extra options to rustc, some of which get passed on to the linker.
+#
+# * linker argument --nmagic turns off page alignment of sections (which saves
+#   flash space)
+# * linker argument -Tlink.x tells the linker to use link.x as the linker
+#   script. This is usually provided by the cortex-m-rt crate, and by default
+#   the version in that crate will include a file called `memory.x` which
+#   describes the particular memory layout for your specific chip. 
+# * no-vectorize-loops turns off the loop vectorizer (seeing as the M0+ doesn't
+#   have SIMD)
+linker = "flip-link"
+rustflags = [
+    "-C", "link-arg=--nmagic",
+    "-C", "link-arg=-Tlink.x",
+    "-C", "link-arg=-Tdefmt.x",
+    "-C", "no-vectorize-loops",
+]
+
+# Use picotool for loading.
+#
+# Load an elf, skipping unchanged flash sectors, verify it, and execute it
+runner = "${PICOTOOL_PATH} load -u -v -x -t elf"
+#runner = "probe-rs run --chip ${CHIP} --protocol swd"
+
+# This is the hard-float ABI for Arm mode.
+#
+# The FPU is enabled by default, and float function arguments use FPU
+# registers.
+[target.thumbv8m.main-none-eabihf]
+# Pass some extra options to rustc, some of which get passed on to the linker.
+#
+# * linker argument --nmagic turns off page alignment of sections (which saves
+#   flash space)
+# * linker argument -Tlink.x tells the linker to use link.x as a linker script.
+#   This is usually provided by the cortex-m-rt crate, and by default the
+#   version in that crate will include a file called `memory.x` which describes
+#   the particular memory layout for your specific chip. 
+# * linker argument -Tdefmt.x also tells the linker to use `defmt.x` as a
+#   secondary linker script. This is required to make defmt_rtt work.
+rustflags = [
+    "-C", "link-arg=--nmagic",
+    "-C", "link-arg=-Tlink.x",
+    "-C", "link-arg=-Tdefmt.x",
+    "-C", "target-cpu=cortex-m33",
+]
+
+# Use picotool for loading.
+#
+# Load an elf, skipping unchanged flash sectors, verify it, and execute it
+runner = "${PICOTOOL_PATH} load -u -v -x -t elf"
+#runner = "probe-rs run --chip ${CHIP} --protocol swd"
+
+# This is the soft-float ABI for RISC-V mode.
+#
+# Hazard 3 does not have an FPU and so float function arguments use integer
+# registers.
+[target.riscv32imac-unknown-none-elf]
+# Pass some extra options to rustc, some of which get passed on to the linker.
+#
+# * linker argument --nmagic turns off page alignment of sections (which saves
+#   flash space)
+# * linker argument -Trp235x_riscv.x also tells the linker to use
+#   `rp235x_riscv.x` as a linker script. This adds in RP2350 RISC-V specific
+#   things that the riscv-rt crate's `link.x` requires and then includes
+#   `link.x` automatically. This is the reverse of how we do it on Cortex-M.
+# * linker argument -Tdefmt.x also tells the linker to use `defmt.x` as a
+#   secondary linker script. This is required to make defmt_rtt work.
+rustflags = [
+    "-C", "link-arg=--nmagic",
+    "-C", "link-arg=-Trp2350_riscv.x",
+    "-C", "link-arg=-Tdefmt.x",
+]
+
+# Use picotool for loading.
+#
+# Load an elf, skipping unchanged flash sectors, verify it, and execute it
+runner = "${PICOTOOL_PATH} load -u -v -x -t elf"
+#runner = "probe-rs run --chip ${CHIP} --protocol swd"
+
+[env]
+DEFMT_LOG = "debug"
@@ -0,0 +1,113 @@
+# Created by https://www.toptal.com/developers/gitignore/api/rust,visualstudiocode,macos,windows,linux
+# Edit at https://www.toptal.com/developers/gitignore?templates=rust,visualstudiocode,macos,windows,linux
+
+### Linux ###
+*~
+
+# temporary files which can be created if a process still has a handle open of a deleted file
+.fuse_hidden*
+
+# KDE directory preferences
+.directory
+
+# Linux trash folder which might appear on any partition or disk
+.Trash-*
+
+# .nfs files are created when an open file is removed but is still being accessed
+.nfs*
+
+### macOS ###
+# General
+.DS_Store
+.AppleDouble
+.LSOverride
+
+# Icon must end with two 
+Icon
+
+
+# Thumbnails
+._*
+
+# Files that might appear in the root of a volume
+.DocumentRevisions-V100
+.fseventsd
+.Spotlight-V100
+.TemporaryItems
+.Trashes
+.VolumeIcon.icns
+.com.apple.timemachine.donotpresent
+
+# Directories potentially created on remote AFP share
+.AppleDB
+.AppleDesktop
+Network Trash Folder
+Temporary Items
+.apdisk
+
+### macOS Patch ###
+# iCloud generated files
+*.icloud
+
+### Rust ###
+# Generated by Cargo
+# will have compiled files and executables
+debug/
+target/
+
+# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
+# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
+Cargo.lock
+
+# These are backup files generated by rustfmt
+**/*.rs.bk
+
+# MSVC Windows builds of rustc generate these, which store debugging information
+*.pdb
+
+### VisualStudioCode ###
+.vscode/*
+!.vscode/settings.json
+!.vscode/tasks.json
+!.vscode/launch.json
+!.vscode/extensions.json
+!.vscode/*.code-snippets
+
+# Local History for Visual Studio Code
+.history/
+
+# Built Visual Studio Code Extensions
+*.vsix
+
+### VisualStudioCode Patch ###
+# Ignore all local history of files
+.history
+.ionide
+
+### Windows ###
+# Windows thumbnail cache files
+Thumbs.db
+Thumbs.db:encryptable
+ehthumbs.db
+ehthumbs_vista.db
+
+# Dump file
+*.stackdump
+
+# Folder config file
+[Dd]esktop.ini
+
+# Recycle Bin used on file shares
+$RECYCLE.BIN/
+
+# Windows Installer files
+*.cab
+*.msi
+*.msix
+*.msm
+*.msp
+
+# Windows shortcuts
+*.lnk
+
+# End of https://www.toptal.com/developers/gitignore/api/rust,visualstudiocode,macos,windows,linux
@@ -0,0 +1 @@
+rp2350
@@ -0,0 +1,8 @@
+{
+  "recommendations": [
+    "marus25.cortex-debug",
+    "rust-lang.rust-analyzer",
+    "probe-rs.probe-rs-debugger",
+    "raspberry-pi.raspberry-pi-pico"
+  ]
+}
@@ -0,0 +1,41 @@
+{
+  "version": "0.2.0",
+  "configurations": [
+    {
+      "name": "Pico Debug (probe-rs)",
+      "cwd": "${workspaceFolder}",
+      "request": "launch",
+      "type": "probe-rs-debug",
+      "connectUnderReset": false,
+      "speed": 5000,
+      "runtimeExecutable": "probe-rs",
+      "chip": "${command:raspberry-pi-pico.getChip}",
+      "runtimeArgs": [
+        "dap-server"
+      ],
+      "flashingConfig": {
+        "flashingEnabled": true,
+        "haltAfterReset": false
+      },
+      "coreConfigs": [
+        {
+          "coreIndex": 0,
+          "programBinary": "${command:raspberry-pi-pico.launchTargetPath}",
+          "rttEnabled": true,
+          "svdFile": "${command:raspberry-pi-pico.getSVDPath}",
+          "rttChannelFormats": [
+            {
+              "channelNumber": 0,
+              "dataFormat": "Defmt",
+              "mode": "NoBlockSkip",
+              "showTimestamps": true
+            }
+          ]
+        }
+      ],
+      "preLaunchTask": "Build + Generate SBOM (debug)",
+      "consoleLogLevel": "Debug",
+      "wireProtocol": "Swd"
+    }
+  ]
+}
@@ -0,0 +1,8 @@
+{
+  "rust-analyzer.cargo.target": "thumbv8m.main-none-eabihf",
+  "rust-analyzer.check.allTargets": false,
+  "editor.formatOnSave": true,
+  "files.exclude": {
+    ".pico-rs": true
+  }
+}
@@ -0,0 +1,124 @@
+{
+  "version": "2.0.0",
+  "tasks": [
+    {
+      "label": "Compile Project",
+      "type": "process",
+      "isBuildCommand": true,
+      "command": "cargo",
+      "args": [
+        "build",
+        "--release"
+      ],
+      "group": {
+        "kind": "build",
+        "isDefault": true
+      },
+      "presentation": {
+        "reveal": "always",
+        "panel": "dedicated"
+      },
+      "problemMatcher": "$rustc",
+      "options": {
+        "env": {
+          "PICOTOOL_PATH": "${command:raspberry-pi-pico.getPicotoolPath}",
+          "CHIP": "${command:raspberry-pi-pico.getChip}"
+        }
+      }
+    },
+    {
+      "label": "Build + Generate SBOM (release)",
+      "type": "shell",
+      "command": "bash",
+      "args": [
+        "-lc",
+        "cargo sbom > ${command:raspberry-pi-pico.sbomTargetPathRelease}"
+      ],
+      "windows": {
+        "command": "powershell",
+        "args": [
+          "-NoProfile",
+          "-ExecutionPolicy",
+          "Bypass",
+          "-Command",
+          "cargo sbom | Set-Content -Encoding utf8 ${command:raspberry-pi-pico.sbomTargetPathRelease}"
+        ]
+      },
+      "dependsOn": "Compile Project",
+      "presentation": {
+        "reveal": "silent",
+        "panel": "shared"
+      },
+      "problemMatcher": []
+    },
+    {
+      "label": "Compile Project (debug)",
+      "type": "process",
+      "isBuildCommand": true,
+      "command": "cargo",
+      "args": [
+        "build"
+      ],
+      "group": {
+        "kind": "build",
+        "isDefault": false
+      },
+      "presentation": {
+        "reveal": "always",
+        "panel": "dedicated"
+      },
+      "problemMatcher": "$rustc",
+      "options": {
+        "env": {
+          "PICOTOOL_PATH": "${command:raspberry-pi-pico.getPicotoolPath}",
+          "CHIP": "${command:raspberry-pi-pico.getChip}"
+        }
+      }
+    },
+    {
+      "label": "Build + Generate SBOM (debug)",
+      "type": "shell",
+      "command": "bash",
+      "args": [
+        "-lc",
+        "cargo sbom > ${command:raspberry-pi-pico.sbomTargetPathDebug}"
+      ],
+      "windows": {
+        "command": "powershell",
+        "args": [
+          "-NoProfile",
+          "-ExecutionPolicy",
+          "Bypass",
+          "-Command",
+          "cargo sbom | Set-Content -Encoding utf8 ${command:raspberry-pi-pico.sbomTargetPathDebug}"
+        ]
+      },
+      "dependsOn": "Compile Project (debug)",
+      "presentation": {
+        "reveal": "silent",
+        "panel": "shared"
+      },
+      "problemMatcher": []
+    },
+    {
+      "label": "Run Project",
+      "type": "shell",
+      "dependsOn": [
+        "Build + Generate SBOM (release)"
+      ],
+      "command": "${command:raspberry-pi-pico.getPicotoolPath}",
+      "args": [
+        "load",
+        "-x",
+        "${command:raspberry-pi-pico.launchTargetPathRelease}",
+        "-t",
+        "elf"
+      ],
+      "presentation": {
+        "reveal": "always",
+        "panel": "dedicated"
+      },
+      "problemMatcher": []
+    }
+  ]
+}
@@ -0,0 +1,35 @@
+
+[package]
+edition = "2024"
+name = "uart"
+version = "0.1.0"
+license = "MIT or Apache-2.0"
+
+[build-dependencies]
+regex = "1.11.0"
+
+[dependencies]
+cortex-m = "0.7"
+cortex-m-rt = "0.7"
+embedded-hal = "1.0.0"
+embedded-hal-nb = "1.0.0"
+nb = "1.1.0"
+fugit = "0.3"
+defmt = "1"
+defmt-rtt = "1"
+
+[target.'cfg( target_arch = "arm" )'.dependencies]
+panic-probe = { version = "1", features = ["print-defmt"] }
+
+[target.'cfg( target_arch = "riscv32" )'.dependencies]
+panic-halt = { version = "1.0.0" }
+
+[target.thumbv6m-none-eabi.dependencies]
+rp2040-boot2 = "0.3"
+rp2040-hal = { version = "0.11", features = ["rt", "critical-section-impl"] }
+
+[target.riscv32imac-unknown-none-elf.dependencies]
+rp235x-hal = { version = "0.3", features = ["rt", "critical-section-impl"] }
+
+[target."thumbv8m.main-none-eabihf".dependencies]
+rp235x-hal = { version = "0.3", features = ["rt", "critical-section-impl"] }
@@ -0,0 +1,204 @@
+
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
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+      and distribution as defined by Sections 1 through 9 of this document.
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+      direction or management of such entity, whether by contract or
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+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
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+
+      You may add Your own copyright statement to Your modifications and
+      may provide additional or different license terms and conditions
+      for use, reproduction, or distribution of Your modifications, or
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+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
+      except as required for reasonable and customary use in describing the
+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+      implied, including, without limitation, any warranties or conditions
+      of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+      PARTICULAR PURPOSE. You are solely responsible for determining the
+      appropriateness of using or redistributing the Work and assume any
+      risks associated with Your exercise of permissions under this License.
+
+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
+      incidental, or consequential damages of any character arising as a
+      result of this License or out of the use or inability to use the
+      Work (including but not limited to damages for loss of goodwill,
+      work stoppage, computer failure or malfunction, or any and all
+      other commercial damages or losses), even if such Contributor
+      has been advised of the possibility of such damages.
+
+   9. Accepting Warranty or Additional Liability. While redistributing
+      the Work or Derivative Works thereof, You may choose to offer,
+      and charge a fee for, acceptance of support, warranty, indemnity,
+      or other liability obligations and/or rights consistent with this
+      License. However, in accepting such obligations, You may act only
+      on Your own behalf and on Your sole responsibility, not on behalf
+      of any other Contributor, and only if You agree to indemnify,
+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
+
+   END OF TERMS AND CONDITIONS
+
+   APPENDIX: How to apply the Apache License to your work.
+
+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "[]"
+      replaced with your own identifying information. (Don't include
+      the brackets!)  The text should be enclosed in the appropriate
+      comment syntax for the file format. We also recommend that a
+      file or class name and description of purpose be included on the
+      same "printed page" as the copyright notice for easier
+      identification within third-party archives.
+
+   Copyright (c) 2021–2024 The rp-rs Developers
+   Copyright (c) 2021 rp-rs organization
+   Copyright (c) 2025 Raspberry Pi Ltd.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
@@ -0,0 +1,24 @@
+MIT License
+
+Copyright (c) 2021–2024 The rp-rs Developers
+Copyright (c) 2021 rp-rs organization
+Copyright (c) 2025 Raspberry Pi Ltd.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+  
@@ -0,0 +1,73 @@
+//! Implementation module
+//!
+//! **File:** `build.rs`
+//! **Author:** Kevin Thomas
+//! **Date:** 2025
+//!
+//! MIT License
+//!
+//! Copyright (c) 2025 Kevin Thomas
+//!
+//! Permission is hereby granted, free of charge, to any person obtaining a copy
+//! of this software and associated documentation files (the "Software"), to deal
+//! in the Software without restriction, including without limitation the rights
+//! to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//! copies of the Software, and to permit persons to whom the Software is
+//! furnished to do so, subject to the following conditions:
+//!
+//! The above copyright notice and this permission notice shall be included in
+//! all copies or substantial portions of the Software.
+//!
+//! THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//! IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//! FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//! AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//! LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//! OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+//! SOFTWARE.
+
+use std::fs::{File, read_to_string};
+use std::io::Write;
+use std::path::PathBuf;
+use regex::Regex;
+
+fn main() {
+    let out = PathBuf::from(std::env::var_os("OUT_DIR").unwrap());
+    let contents = read_to_string(".pico-rs").unwrap_or_default().trim().to_lowercase();
+    let target = setup_target(&contents, &out);
+    update_cargo_config(&target);
+    write_riscv(&out);
+    print_cfgs(&out);
+}
+fn setup_target(c: &str, out: &PathBuf) -> String {
+    // Setup the correct build target based on pico-rs
+    if c == "rp2040" { write_rp2040(out); return "thumbv6m-none-eabi".to_string(); }
+    write_rp2350(out);
+    if c.contains("riscv") { "riscv32imac-unknown-none-elf".to_string() } else { "thumbv8m.main-none-eabihf".to_string() }
+}
+fn write_rp2040(out: &PathBuf) {
+    File::create(out.join("memory.x")).unwrap().write_all(include_bytes!("rp2040.x")).unwrap();
+    println!("cargo::rustc-cfg=rp2040");
+    println!("cargo:rerun-if-changed=rp2040.x");
+}
+fn write_rp2350(out: &PathBuf) {
+    File::create(out.join("memory.x")).unwrap().write_all(include_bytes!("rp2350.x")).unwrap();
+    println!("cargo::rustc-cfg=rp2350");
+    println!("cargo:rerun-if-changed=rp2350.x");
+}
+fn update_cargo_config(target: &str) {
+    let re = Regex::new(r"target = .*").unwrap();
+    let result = re.replace(include_str!(".cargo/config.toml"), format!("target = \"{}\"", target));
+    File::create(".cargo/config.toml").unwrap().write_all(result.as_bytes()).unwrap();
+}
+fn write_riscv(out: &PathBuf) {
+    File::create(out.join("rp2350_riscv.x")).unwrap().write_all(include_bytes!("rp2350_riscv.x")).unwrap();
+}
+fn print_cfgs(out: &PathBuf) {
+    println!("cargo::rustc-check-cfg=cfg(rp2040)");
+    println!("cargo::rustc-check-cfg=cfg(rp2350)");
+    println!("cargo:rustc-link-search={}", out.display());
+    println!("cargo:rerun-if-changed=.pico-rs");
+    println!("cargo:rerun-if-changed=rp2350_riscv.x");
+    println!("cargo:rerun-if-changed=build.rs");
+}
@@ -0,0 +1,91 @@
+/*
+* SPDX-License-Identifier: MIT OR Apache-2.0
+*
+* Copyright (c) 2021–2024 The rp-rs Developers
+* Copyright (c) 2021 rp-rs organization
+* Copyright (c) 2025 Raspberry Pi Ltd.
+*/
+
+MEMORY {
+    BOOT2 : ORIGIN = 0x10000000, LENGTH = 0x100
+    /*
+     * Here we assume you have 2048 KiB of Flash. This is what the Pi Pico
+     * has, but your board may have more or less Flash and you should adjust
+     * this value to suit.
+     */
+    FLASH : ORIGIN = 0x10000100, LENGTH = 2048K - 0x100
+    /*
+     * RAM consists of 4 banks, SRAM0-SRAM3, with a striped mapping.
+     * This is usually good for performance, as it distributes load on
+     * those banks evenly.
+     */
+    RAM : ORIGIN = 0x20000000, LENGTH = 256K
+    /*
+     * RAM banks 4 and 5 use a direct mapping. They can be used to have
+     * memory areas dedicated for some specific job, improving predictability
+     * of access times.
+     * Example: Separate stacks for core0 and core1.
+     */
+    SRAM4 : ORIGIN = 0x20040000, LENGTH = 4k
+    SRAM5 : ORIGIN = 0x20041000, LENGTH = 4k
+
+    /* SRAM banks 0-3 can also be accessed directly. However, those ranges
+       alias with the RAM mapping, above. So don't use them at the same time!
+    SRAM0 : ORIGIN = 0x21000000, LENGTH = 64k
+    SRAM1 : ORIGIN = 0x21010000, LENGTH = 64k
+    SRAM2 : ORIGIN = 0x21020000, LENGTH = 64k
+    SRAM3 : ORIGIN = 0x21030000, LENGTH = 64k
+    */
+}
+
+EXTERN(BOOT2_FIRMWARE)
+
+SECTIONS {
+    /* ### Boot loader
+     *
+     * An executable block of code which sets up the QSPI interface for
+     * 'Execute-In-Place' (or XIP) mode. Also sends chip-specific commands to
+     * the external flash chip.
+     *
+     * Must go at the start of external flash, where the Boot ROM expects it.
+     */
+    .boot2 ORIGIN(BOOT2) :
+    {
+        KEEP(*(.boot2));
+    } > BOOT2
+} INSERT BEFORE .text;
+
+SECTIONS {
+    /* ### Boot ROM info
+     *
+     * Goes after .vector_table, to keep it in the first 512 bytes of flash,
+     * where picotool can find it
+     */
+    .boot_info : ALIGN(4)
+    {
+        KEEP(*(.boot_info));
+    } > FLASH
+
+} INSERT AFTER .vector_table;
+
+/* move .text to start /after/ the boot info */
+_stext = ADDR(.boot_info) + SIZEOF(.boot_info);
+
+SECTIONS {
+    /* ### Picotool 'Binary Info' Entries
+     *
+     * Picotool looks through this block (as we have pointers to it in our
+     * header) to find interesting information.
+     */
+    .bi_entries : ALIGN(4)
+    {
+        /* We put this in the header */
+        __bi_entries_start = .;
+        /* Here are the entries */
+        KEEP(*(.bi_entries));
+        /* Keep this block a nice round size */
+        . = ALIGN(4);
+        /* We put this in the header */
+        __bi_entries_end = .;
+    } > FLASH
+} INSERT AFTER .text;
@@ -0,0 +1,83 @@
+/*
+* SPDX-License-Identifier: MIT OR Apache-2.0
+*
+* Copyright (c) 2021–2024 The rp-rs Developers
+* Copyright (c) 2021 rp-rs organization
+* Copyright (c) 2025 Raspberry Pi Ltd.
+*/
+
+MEMORY {
+      /*
+      * The RP2350 has either external or internal flash.
+      *
+      * 2 MiB is a safe default here, although a Pico 2 has 4 MiB.
+      */
+      FLASH : ORIGIN = 0x10000000, LENGTH = 2048K
+      /*
+      * RAM consists of 8 banks, SRAM0-SRAM7, with a striped mapping.
+      * This is usually good for performance, as it distributes load on
+      * those banks evenly.
+      */
+      RAM : ORIGIN = 0x20000000, LENGTH = 512K
+      /*
+      * RAM banks 8 and 9 use a direct mapping. They can be used to have
+      * memory areas dedicated for some specific job, improving predictability
+      * of access times.
+      * Example: Separate stacks for core0 and core1.
+      */
+      SRAM4 : ORIGIN = 0x20080000, LENGTH = 4K
+      SRAM5 : ORIGIN = 0x20081000, LENGTH = 4K
+  }
+
+  SECTIONS {
+      /* ### Boot ROM info
+      *
+      * Goes after .vector_table, to keep it in the first 4K of flash
+      * where the Boot ROM (and picotool) can find it
+      */
+      .start_block : ALIGN(4)
+      {
+          __start_block_addr = .;
+          KEEP(*(.start_block));
+      } > FLASH
+
+  } INSERT AFTER .vector_table;
+
+  /* move .text to start /after/ the boot info */
+  _stext = ADDR(.start_block) + SIZEOF(.start_block);
+
+  SECTIONS {
+      /* ### Picotool 'Binary Info' Entries
+      *
+      * Picotool looks through this block (as we have pointers to it in our
+      * header) to find interesting information.
+      */
+      .bi_entries : ALIGN(4)
+      {
+          /* We put this in the header */
+          __bi_entries_start = .;
+          /* Here are the entries */
+          KEEP(*(.bi_entries));
+          /* Keep this block a nice round size */
+          . = ALIGN(4);
+          /* We put this in the header */
+          __bi_entries_end = .;
+      } > FLASH
+  } INSERT AFTER .text;
+
+  SECTIONS {
+      /* ### Boot ROM extra info
+      *
+      * Goes after everything in our program, so it can contain a signature.
+      */
+      .end_block : ALIGN(4)
+      {
+          __end_block_addr = .;
+          KEEP(*(.end_block));
+      } > FLASH
+
+  } INSERT AFTER .uninit;
+
+  PROVIDE(start_to_end = __end_block_addr - __start_block_addr);
+  PROVIDE(end_to_start = __start_block_addr - __end_block_addr);
+  
@@ -0,0 +1,259 @@
+/*
+* SPDX-License-Identifier: MIT OR Apache-2.0
+*
+* Copyright (c) 2021–2024 The rp-rs Developers
+* Copyright (c) 2021 rp-rs organization
+* Copyright (c) 2025 Raspberry Pi Ltd.
+*/
+
+MEMORY {
+    /*
+     * The RP2350 has either external or internal flash.
+     *
+     * 2 MiB is a safe default here, although a Pico 2 has 4 MiB.
+     */
+    FLASH : ORIGIN = 0x10000000, LENGTH = 2048K
+    /*
+     * RAM consists of 8 banks, SRAM0-SRAM7, with a striped mapping.
+     * This is usually good for performance, as it distributes load on
+     * those banks evenly.
+     */
+    RAM : ORIGIN = 0x20000000, LENGTH = 512K
+    /*
+     * RAM banks 8 and 9 use a direct mapping. They can be used to have
+     * memory areas dedicated for some specific job, improving predictability
+     * of access times.
+     * Example: Separate stacks for core0 and core1.
+     */
+    SRAM4 : ORIGIN = 0x20080000, LENGTH = 4K
+    SRAM5 : ORIGIN = 0x20081000, LENGTH = 4K
+}
+
+/* # Developer notes
+
+- Symbols that start with a double underscore (__) are considered "private"
+
+- Symbols that start with a single underscore (_) are considered "semi-public"; they can be
+  overridden in a user linker script, but should not be referred from user code (e.g. `extern "C" {
+  static mut _heap_size }`).
+
+- `EXTERN` forces the linker to keep a symbol in the final binary. We use this to make sure a
+  symbol is not dropped if it appears in or near the front of the linker arguments and "it's not
+  needed" by any of the preceding objects (linker arguments)
+
+- `PROVIDE` is used to provide default values that can be overridden by a user linker script
+
+- On alignment: it's important for correctness that the VMA boundaries of both .bss and .data *and*
+  the LMA of .data are all `32`-byte aligned. These alignments are assumed by the RAM
+  initialization routine. There's also a second benefit: `32`-byte aligned boundaries
+  means that you won't see "Address (..) is out of bounds" in the disassembly produced by `objdump`.
+*/
+
+PROVIDE(_stext = ORIGIN(FLASH));
+PROVIDE(_stack_start = ORIGIN(RAM) + LENGTH(RAM));
+PROVIDE(_max_hart_id = 0);
+PROVIDE(_hart_stack_size = 2K);
+PROVIDE(_heap_size = 0);
+
+PROVIDE(InstructionMisaligned = ExceptionHandler);
+PROVIDE(InstructionFault = ExceptionHandler);
+PROVIDE(IllegalInstruction = ExceptionHandler);
+PROVIDE(Breakpoint = ExceptionHandler);
+PROVIDE(LoadMisaligned = ExceptionHandler);
+PROVIDE(LoadFault = ExceptionHandler);
+PROVIDE(StoreMisaligned = ExceptionHandler);
+PROVIDE(StoreFault = ExceptionHandler);
+PROVIDE(UserEnvCall = ExceptionHandler);
+PROVIDE(SupervisorEnvCall = ExceptionHandler);
+PROVIDE(MachineEnvCall = ExceptionHandler);
+PROVIDE(InstructionPageFault = ExceptionHandler);
+PROVIDE(LoadPageFault = ExceptionHandler);
+PROVIDE(StorePageFault = ExceptionHandler);
+
+PROVIDE(SupervisorSoft = DefaultHandler);
+PROVIDE(MachineSoft = DefaultHandler);
+PROVIDE(SupervisorTimer = DefaultHandler);
+PROVIDE(MachineTimer = DefaultHandler);
+PROVIDE(SupervisorExternal = DefaultHandler);
+PROVIDE(MachineExternal = DefaultHandler);
+
+PROVIDE(DefaultHandler = DefaultInterruptHandler);
+PROVIDE(ExceptionHandler = DefaultExceptionHandler);
+
+/* # Pre-initialization function */
+/* If the user overrides this using the `#[pre_init]` attribute or by creating a `__pre_init` function,
+   then the function this points to will be called before the RAM is initialized. */
+PROVIDE(__pre_init = default_pre_init);
+
+/* A PAC/HAL defined routine that should initialize custom interrupt controller if needed. */
+PROVIDE(_setup_interrupts = default_setup_interrupts);
+
+/* # Multi-processing hook function
+   fn _mp_hook() -> bool;
+
+   This function is called from all the harts and must return true only for one hart,
+   which will perform memory initialization. For other harts it must return false
+   and implement wake-up in platform-dependent way (e.g. after waiting for a user interrupt).
+*/
+PROVIDE(_mp_hook = default_mp_hook);
+
+/* # Start trap function override
+  By default uses the riscv crates default trap handler
+  but by providing the `_start_trap` symbol external crates can override.
+*/
+PROVIDE(_start_trap = default_start_trap);
+
+SECTIONS
+{
+  .text.dummy (NOLOAD) :
+  {
+    /* This section is intended to make _stext address work */
+    . = ABSOLUTE(_stext);
+  } > FLASH
+
+  .text _stext :
+  {
+    /* Put reset handler first in .text section so it ends up as the entry */
+    /* point of the program. */
+    KEEP(*(.init));
+    KEEP(*(.init.rust));
+    . = ALIGN(4);
+    __start_block_addr = .;
+    KEEP(*(.start_block));
+    . = ALIGN(4);
+    *(.trap);
+    *(.trap.rust);
+    *(.text.abort);
+    *(.text .text.*);
+    . = ALIGN(4);
+  } > FLASH
+
+  /* ### Picotool 'Binary Info' Entries
+    *
+    * Picotool looks through this block (as we have pointers to it in our
+    * header) to find interesting information.
+    */
+  .bi_entries : ALIGN(4)
+  {
+      /* We put this in the header */
+      __bi_entries_start = .;
+      /* Here are the entries */
+      KEEP(*(.bi_entries));
+      /* Keep this block a nice round size */
+      . = ALIGN(4);
+      /* We put this in the header */
+      __bi_entries_end = .;
+  } > FLASH
+
+  .rodata : ALIGN(4)
+  {
+    *(.srodata .srodata.*);
+    *(.rodata .rodata.*);
+
+    /* 4-byte align the end (VMA) of this section.
+       This is required by LLD to ensure the LMA of the following .data
+       section will have the correct alignment. */
+    . = ALIGN(4);
+  } > FLASH
+
+  .data : ALIGN(32)
+  {
+    _sidata = LOADADDR(.data);
+    __sidata = LOADADDR(.data);
+    _sdata = .;
+    __sdata = .;
+    /* Must be called __global_pointer$ for linker relaxations to work. */
+    PROVIDE(__global_pointer$ = . + 0x800);
+    *(.sdata .sdata.* .sdata2 .sdata2.*);
+    *(.data .data.*);
+    . = ALIGN(32);
+    _edata = .;
+    __edata = .;
+  } > RAM AT > FLASH
+
+  .bss (NOLOAD) : ALIGN(32)
+  {
+    _sbss = .;
+    *(.sbss .sbss.* .bss .bss.*);
+    . = ALIGN(32);
+    _ebss = .;
+  } > RAM
+
+  .end_block : ALIGN(4)
+  {
+      __end_block_addr = .;
+      KEEP(*(.end_block));
+  } > FLASH
+
+  /* fictitious region that represents the memory available for the heap */
+  .heap (NOLOAD) :
+  {
+    _sheap = .;
+    . += _heap_size;
+    . = ALIGN(4);
+    _eheap = .;
+  } > RAM
+
+  /* fictitious region that represents the memory available for the stack */
+  .stack (NOLOAD) :
+  {
+    _estack = .;
+    . = ABSOLUTE(_stack_start);
+    _sstack = .;
+  } > RAM
+
+  /* fake output .got section */
+  /* Dynamic relocations are unsupported. This section is only used to detect
+     relocatable code in the input files and raise an error if relocatable code
+     is found */
+  .got (INFO) :
+  {
+    KEEP(*(.got .got.*));
+  }
+
+  .eh_frame (INFO) : { KEEP(*(.eh_frame)) }
+  .eh_frame_hdr (INFO) : { *(.eh_frame_hdr) }
+}
+
+PROVIDE(start_to_end = __end_block_addr - __start_block_addr);
+PROVIDE(end_to_start = __start_block_addr - __end_block_addr);
+
+
+/* Do not exceed this mark in the error messages above                                    | */
+ASSERT(ORIGIN(FLASH) % 4 == 0, "
+ERROR(riscv-rt): the start of the FLASH must be 4-byte aligned");
+
+ASSERT(ORIGIN(RAM) % 32 == 0, "
+ERROR(riscv-rt): the start of the RAM must be 32-byte aligned");
+
+ASSERT(_stext % 4 == 0, "
+ERROR(riscv-rt): `_stext` must be 4-byte aligned");
+
+ASSERT(_sdata % 32 == 0 && _edata % 32 == 0, "
+BUG(riscv-rt): .data is not 32-byte aligned");
+
+ASSERT(_sidata % 32 == 0, "
+BUG(riscv-rt): the LMA of .data is not 32-byte aligned");
+
+ASSERT(_sbss % 32 == 0 && _ebss % 32 == 0, "
+BUG(riscv-rt): .bss is not 32-byte aligned");
+
+ASSERT(_sheap % 4 == 0, "
+BUG(riscv-rt): start of .heap is not 4-byte aligned");
+
+ASSERT(_stext + SIZEOF(.text) < ORIGIN(FLASH) + LENGTH(FLASH), "
+ERROR(riscv-rt): The .text section must be placed inside the FLASH region.
+Set _stext to an address smaller than 'ORIGIN(FLASH) + LENGTH(FLASH)'");
+
+ASSERT(SIZEOF(.stack) > (_max_hart_id + 1) * _hart_stack_size, "
+ERROR(riscv-rt): .stack section is too small for allocating stacks for all the harts.
+Consider changing `_max_hart_id` or `_hart_stack_size`.");
+
+ASSERT(SIZEOF(.got) == 0, "
+.got section detected in the input files. Dynamic relocations are not
+supported. If you are linking to C code compiled using the `gcc` crate
+then modify your build script to compile the C code _without_ the
+-fPIC flag. See the documentation of the `gcc::Config.fpic` method for
+details.");
+
+/* Do not exceed this mark in the error messages above                                    | */
@@ -0,0 +1,124 @@
+//! Implementation module
+//!
+//! **File:** `board.rs`
+//! **Author:** Kevin Thomas
+//! **Date:** 2025
+//!
+//! MIT License
+//!
+//! Copyright (c) 2025 Kevin Thomas
+//!
+//! Permission is hereby granted, free of charge, to any person obtaining a copy
+//! of this software and associated documentation files (the "Software"), to deal
+//! in the Software without restriction, including without limitation the rights
+//! to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//! copies of the Software, and to permit persons to whom the Software is
+//! furnished to do so, subject to the following conditions:
+//!
+//! The above copyright notice and this permission notice shall be included in
+//! all copies or substantial portions of the Software.
+//!
+//! THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//! IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//! FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//! AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//! LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//! OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+//! SOFTWARE.
+
+// Alias our HAL crate
+#[cfg(rp2350)]
+use rp235x_hal as hal;
+#[cfg(rp2040)]
+use rp2040_hal as hal;
+
+// UART driver for echo demo
+use crate::uart;
+
+/// External crystal frequency in Hz (12 MHz).
+pub(crate) const XTAL_FREQ_HZ: u32 = 12_000_000u32;
+
+/// UART baud rate in bits per second.
+pub(crate) const UART_BAUD: u32 = 115_200;
+
+/// Initialise system clocks and PLLs from the external 12 MHz crystal.
+///
+/// # Arguments
+///
+/// * `xosc` - XOSC peripheral singleton.
+/// * `clocks` - CLOCKS peripheral singleton.
+/// * `pll_sys` - PLL_SYS peripheral singleton.
+/// * `pll_usb` - PLL_USB peripheral singleton.
+/// * `resets` - Mutable reference to the RESETS peripheral.
+/// * `watchdog` - Mutable reference to the watchdog timer.
+///
+/// # Returns
+///
+/// Configured clocks manager.
+///
+/// # Panics
+///
+/// Panics if clock initialisation fails.
+pub(crate) fn init_clocks(
+    xosc: hal::pac::XOSC,
+    clocks: hal::pac::CLOCKS,
+    pll_sys: hal::pac::PLL_SYS,
+    pll_usb: hal::pac::PLL_USB,
+    resets: &mut hal::pac::RESETS,
+    watchdog: &mut hal::Watchdog,
+) -> hal::clocks::ClocksManager {
+    hal::clocks::init_clocks_and_plls(
+        XTAL_FREQ_HZ, xosc, clocks, pll_sys, pll_usb, resets, watchdog,
+    )
+    .unwrap()
+}
+
+/// Unlock the GPIO bank and return the pin set.
+///
+/// # Arguments
+///
+/// * `io_bank0` - IO_BANK0 peripheral singleton.
+/// * `pads_bank0` - PADS_BANK0 peripheral singleton.
+/// * `sio` - SIO peripheral singleton.
+/// * `resets` - Mutable reference to the RESETS peripheral.
+///
+/// # Returns
+///
+/// GPIO pin set for the entire bank.
+pub(crate) fn init_pins(
+    io_bank0: hal::pac::IO_BANK0,
+    pads_bank0: hal::pac::PADS_BANK0,
+    sio: hal::pac::SIO,
+    resets: &mut hal::pac::RESETS,
+) -> hal::gpio::Pins {
+    let sio = hal::Sio::new(sio);
+    hal::gpio::Pins::new(io_bank0, pads_bank0, sio.gpio_bank0, resets)
+}
+
+/// Initialise all peripherals and run the UART echo demo.
+///
+/// # Arguments
+///
+/// * `pac` - PAC Peripherals singleton (consumed).
+pub(crate) fn run(mut pac: hal::pac::Peripherals) -> ! {
+    let clocks = init_clocks(pac.XOSC, pac.CLOCKS, pac.PLL_SYS, pac.PLL_USB, &mut pac.RESETS, &mut hal::Watchdog::new(pac.WATCHDOG));
+    let p = init_pins(pac.IO_BANK0, pac.PADS_BANK0, pac.SIO, &mut pac.RESETS);
+    let mut drv = uart::UartDriver::init(pac.UART0, p.gpio0, p.gpio1, UART_BAUD, &mut pac.RESETS, &clocks);
+    drv.puts(b"UART driver ready (115200 8N1)\r\nType characters to echo them back in UPPERCASE:\r\n");
+    echo_loop(&mut drv)
+}
+
+/// Run the uppercase echo loop forever.
+///
+/// # Arguments
+///
+/// * `drv` - Mutable reference to the UART driver.
+fn echo_loop(drv: &mut uart::UartDriver) -> ! {
+    loop {
+        if drv.is_readable() {
+            let c = drv.getchar();
+            drv.putchar(uart::UartDriver::to_upper(c));
+        }
+    }
+}
+
@@ -0,0 +1,83 @@
+//! Implementation module
+//!
+//! **File:** `main.rs`
+//! **Author:** Kevin Thomas
+//! **Date:** 2025
+//!
+//! MIT License
+//!
+//! Copyright (c) 2025 Kevin Thomas
+//!
+//! Permission is hereby granted, free of charge, to any person obtaining a copy
+//! of this software and associated documentation files (the "Software"), to deal
+//! in the Software without restriction, including without limitation the rights
+//! to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//! copies of the Software, and to permit persons to whom the Software is
+//! furnished to do so, subject to the following conditions:
+//!
+//! The above copyright notice and this permission notice shall be included in
+//! all copies or substantial portions of the Software.
+//!
+//! THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//! IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//! FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//! AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//! LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//! OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+//! SOFTWARE.
+
+#![no_std]
+#![no_main]
+
+// Board-level helpers: constants, type aliases, and init functions
+mod board;
+// UART driver module
+mod uart;
+
+// Debugging output over RTT
+use defmt_rtt as _;
+// Panic handler for RISC-V targets
+#[cfg(target_arch = "riscv32")]
+use panic_halt as _;
+// Panic handler for ARM targets
+#[cfg(target_arch = "arm")]
+use panic_probe as _;
+
+// HAL entry-point macro
+use hal::entry;
+
+// Alias our HAL crate
+#[cfg(rp2350)]
+use rp235x_hal as hal;
+#[cfg(rp2040)]
+use rp2040_hal as hal;
+
+/// Second-stage boot loader for RP2040
+#[unsafe(link_section = ".boot2")]
+#[used]
+#[cfg(rp2040)]
+pub static BOOT2: [u8; 256] = rp2040_boot2::BOOT_LOADER_W25Q080;
+
+/// Boot metadata for the RP2350 Boot ROM
+#[unsafe(link_section = ".start_block")]
+#[used]
+#[cfg(rp2350)]
+pub static IMAGE_DEF: hal::block::ImageDef = hal::block::ImageDef::secure_exe();
+
+/// Application entry point for the UART uppercase echo demo.
+#[entry]
+fn main() -> ! {
+    board::run(hal::pac::Peripherals::take().unwrap())
+}
+
+/// Picotool binary info metadata
+#[unsafe(link_section = ".bi_entries")]
+#[used]
+pub static PICOTOOL_ENTRIES: [hal::binary_info::EntryAddr; 5] = [
+    hal::binary_info::rp_cargo_bin_name!(),
+    hal::binary_info::rp_cargo_version!(),
+    hal::binary_info::rp_program_description!(c"UART Uppercase Echo"),
+    hal::binary_info::rp_cargo_homepage_url!(),
+    hal::binary_info::rp_program_build_attribute!(),
+];
+
@@ -0,0 +1,216 @@
+//! Implementation module
+//!
+//! **File:** `uart.rs`
+//! **Author:** Kevin Thomas
+//! **Date:** 2025
+//!
+//! MIT License
+//!
+//! Copyright (c) 2025 Kevin Thomas
+//!
+//! Permission is hereby granted, free of charge, to any person obtaining a copy
+//! of this software and associated documentation files (the "Software"), to deal
+//! in the Software without restriction, including without limitation the rights
+//! to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//! copies of the Software, and to permit persons to whom the Software is
+//! furnished to do so, subject to the following conditions:
+//!
+//! The above copyright notice and this permission notice shall be included in
+//! all copies or substantial portions of the Software.
+//!
+//! THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//! IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//! FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//! AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//! LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//! OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+//! SOFTWARE.
+
+// Rate extension trait for .Hz() baud rate construction
+use fugit::RateExtU32;
+// Non-blocking I/O helper for UART read/write
+use nb::block;
+// Alias our HAL crate
+use rp235x_hal as hal;
+// Clock trait for accessing system clock frequency
+use hal::Clock;
+// UART configuration and peripheral types
+use hal::uart::{DataBits, Enabled, StopBits, UartConfig, UartPeripheral};
+// GPIO pin types and function selectors
+use hal::gpio::{FunctionNull, FunctionUart, Pin, PullDown, PullNone};
+// UART0 peripheral singleton type
+use hal::pac::UART0;
+
+/// Type alias for the configured TX pin (GPIO 0, UART function, no pull).
+type TxPin = Pin<hal::gpio::bank0::Gpio0, FunctionUart, PullNone>;
+
+/// Type alias for the configured RX pin (GPIO 1, UART function, no pull).
+type RxPin = Pin<hal::gpio::bank0::Gpio1, FunctionUart, PullNone>;
+
+/// Type alias for the default TX pin state from `Pins::new()`.
+type TxPinDefault = Pin<hal::gpio::bank0::Gpio0, FunctionNull, PullDown>;
+
+/// Type alias for the default RX pin state from `Pins::new()`.
+type RxPinDefault = Pin<hal::gpio::bank0::Gpio1, FunctionNull, PullDown>;
+
+/// Type alias for the fully-enabled UART0 peripheral with TX/RX pins.
+type EnabledUart = UartPeripheral<Enabled, UART0, (TxPin, RxPin)>;
+
+/// Blocking UART0 driver that owns the enabled peripheral and its pins.
+pub struct UartDriver {
+    uart: EnabledUart,
+}
+
+/// Reconfigure TX and RX pins from their default state to UART function.
+fn reconfigure_pins(tx_pin: TxPinDefault, rx_pin: RxPinDefault) -> (TxPin, RxPin) {
+    (
+        tx_pin.reconfigure::<FunctionUart, PullNone>(),
+        rx_pin.reconfigure::<FunctionUart, PullNone>(),
+    )
+}
+
+impl UartDriver {
+    /// Initialize hardware UART0 on the specified TX and RX GPIO pins.
+    ///
+    /// Configures UART0 at the requested baud rate, reconfigures the GPIO
+    /// pins for UART function, and enables 8N1 framing.
+    ///
+    /// # Arguments
+    ///
+    /// * `uart0` - PAC UART0 peripheral singleton.
+    /// * `tx_pin` - GPIO pin to use as UART0 TX (typically GPIO 0).
+    /// * `rx_pin` - GPIO pin to use as UART0 RX (typically GPIO 1).
+    /// * `baud_rate` - Desired baud rate in bits per second (e.g. 115200).
+    /// * `resets` - Mutable reference to the RESETS peripheral.
+    /// * `clocks` - Reference to the initialised clock configuration.
+    ///
+    /// # Panics
+    ///
+    /// Panics if the HAL cannot achieve the requested baud rate.
+    pub fn init(
+        uart0: UART0,
+        tx_pin: TxPinDefault,
+        rx_pin: RxPinDefault,
+        baud_rate: u32,
+        resets: &mut hal::pac::RESETS,
+        clocks: &hal::clocks::ClocksManager,
+    ) -> Self {
+        let pins = reconfigure_pins(tx_pin, rx_pin);
+        let cfg = UartConfig::new(baud_rate.Hz(), DataBits::Eight, None, StopBits::One);
+        let uart = UartPeripheral::new(uart0, pins, resets)
+            .enable(cfg, clocks.peripheral_clock.freq())
+            .unwrap();
+        Self { uart }
+    }
+
+    /// Check whether a received character is waiting in the UART FIFO.
+    ///
+    /// Returns immediately without blocking.
+    ///
+    /// # Returns
+    ///
+    /// `true` if at least one byte is available to read, `false` otherwise.
+    pub fn is_readable(&self) -> bool {
+        self.uart.uart_is_readable()
+    }
+
+    /// Read one character from UART0 (blocking).
+    ///
+    /// Blocks until a byte arrives in the receive FIFO, then returns it.
+    ///
+    /// # Returns
+    ///
+    /// The received byte.
+    pub fn getchar(&mut self) -> u8 {
+        block!(embedded_hal_nb::serial::Read::read(&mut self.uart)).unwrap()
+    }
+
+    /// Transmit one character over UART0 (blocking).
+    ///
+    /// Waits until the transmit FIFO has space, then places the byte into
+    /// the FIFO.
+    ///
+    /// # Arguments
+    ///
+    /// * `c` - Byte to transmit.
+    pub fn putchar(&mut self, c: u8) {
+        block!(embedded_hal_nb::serial::Write::write(&mut self.uart, c)).unwrap();
+    }
+
+    /// Transmit a null-terminated string over UART0.
+    ///
+    /// Sends every byte in the slice, blocking until all bytes are sent.
+    ///
+    /// # Arguments
+    ///
+    /// * `s` - Byte slice to transmit.
+    pub fn puts(&mut self, s: &[u8]) {
+        self.uart.write_full_blocking(s);
+    }
+
+    /// Convert a lowercase ASCII character to uppercase.
+    ///
+    /// Returns the uppercase equivalent if the character is in `b'a'`–`b'z'`;
+    /// all other characters are passed through unchanged.
+    ///
+    /// # Arguments
+    ///
+    /// * `c` - Input byte.
+    ///
+    /// # Returns
+    ///
+    /// Uppercase equivalent, or the original byte.
+    pub fn to_upper(c: u8) -> u8 {
+        if c >= b'a' && c <= b'z' {
+            c - 32
+        } else {
+            c
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    // Import all parent module items
+    use super::*;
+
+    #[test]
+    fn to_upper_lowercase_a() {
+        assert_eq!(UartDriver::to_upper(b'a'), b'A');
+    }
+
+    #[test]
+    fn to_upper_lowercase_z() {
+        assert_eq!(UartDriver::to_upper(b'z'), b'Z');
+    }
+
+    #[test]
+    fn to_upper_lowercase_m() {
+        assert_eq!(UartDriver::to_upper(b'm'), b'M');
+    }
+
+    #[test]
+    fn to_upper_already_uppercase() {
+        assert_eq!(UartDriver::to_upper(b'A'), b'A');
+    }
+
+    #[test]
+    fn to_upper_digit_unchanged() {
+        assert_eq!(UartDriver::to_upper(b'5'), b'5');
+    }
+
+    #[test]
+    fn to_upper_space_unchanged() {
+        assert_eq!(UartDriver::to_upper(b' '), b' ');
+    }
+
+    #[test]
+    fn to_upper_newline_unchanged() {
+        assert_eq!(UartDriver::to_upper(b'\n'), b'\n');
+    }
+
+    #[test]
+    fn to_upper_null_unchanged() {
+        assert_eq!(UartDriver::to_upper(0), 0);
+    }
+}
@@ -0,0 +1,22 @@
+{
+    "configurations": [
+        {
+            "name": "Pico",
+            "includePath": [
+                "${workspaceFolder}/**",
+                "${userHome}/.pico-sdk/sdk/2.2.0/**"
+            ],
+            "forcedInclude": [
+                "${userHome}/.pico-sdk/sdk/2.2.0/src/common/pico_base_headers/include/pico.h",
+                "${workspaceFolder}/build/generated/pico_base/pico/config_autogen.h"
+            ],
+            "defines": [],
+            "compilerPath": "${userHome}/.pico-sdk/toolchain/14_2_Rel1/bin/arm-none-eabi-gcc.exe",
+            "compileCommands": "${workspaceFolder}/build/compile_commands.json",
+            "cStandard": "c17",
+            "cppStandard": "c++14",
+            "intelliSenseMode": "linux-gcc-arm"
+        }
+    ],
+    "version": 4
+}
@@ -0,0 +1,15 @@
+[
+    {
+        "name": "Pico",
+        "compilers": {
+            "C": "${command:raspberry-pi-pico.getCompilerPath}",
+            "CXX": "${command:raspberry-pi-pico.getCxxCompilerPath}"
+        },
+        "environmentVariables": {
+            "PATH": "${command:raspberry-pi-pico.getEnvPath};${env:PATH}"
+        },
+        "cmakeSettings": {
+            "Python3_EXECUTABLE": "${command:raspberry-pi-pico.getPythonPath}"
+        }
+    }
+]
@@ -0,0 +1,9 @@
+{
+    "recommendations": [
+        "marus25.cortex-debug",
+        "ms-vscode.cpptools",
+        "ms-vscode.cpptools-extension-pack",
+        "ms-vscode.vscode-serial-monitor",
+        "raspberry-pi.raspberry-pi-pico"
+    ]
+}
@@ -0,0 +1,50 @@
+{
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "Pico Debug (Cortex-Debug)",
+            "cwd": "${userHome}/.pico-sdk/openocd/0.12.0+dev/scripts",
+            "executable": "${command:raspberry-pi-pico.launchTargetPath}",
+            "request": "launch",
+            "type": "cortex-debug",
+            "servertype": "openocd",
+            "serverpath": "${userHome}/.pico-sdk/openocd/0.12.0+dev/openocd.exe",
+            "gdbPath": "${command:raspberry-pi-pico.getGDBPath}",
+            "device": "${command:raspberry-pi-pico.getChipUppercase}",
+            "configFiles": [
+                "interface/cmsis-dap.cfg",
+                "target/${command:raspberry-pi-pico.getTarget}.cfg"
+            ],
+            "svdFile": "${userHome}/.pico-sdk/sdk/2.2.0/src/${command:raspberry-pi-pico.getChip}/hardware_regs/${command:raspberry-pi-pico.getChipUppercase}.svd",
+            "runToEntryPoint": "main",
+            // Fix for no_flash binaries, where monitor reset halt doesn't do what is expected
+            // Also works fine for flash binaries
+            "overrideLaunchCommands": [
+                "monitor reset init",
+                "load \"${command:raspberry-pi-pico.launchTargetPath}\""
+            ],
+            "openOCDLaunchCommands": [
+                "adapter speed 5000"
+            ]
+        },
+        {
+            "name": "Pico Debug (Cortex-Debug with external OpenOCD)",
+            "cwd": "${workspaceRoot}",
+            "executable": "${command:raspberry-pi-pico.launchTargetPath}",
+            "request": "launch",
+            "type": "cortex-debug",
+            "servertype": "external",
+            "gdbTarget": "localhost:3333",
+            "gdbPath": "${command:raspberry-pi-pico.getGDBPath}",
+            "device": "${command:raspberry-pi-pico.getChipUppercase}",
+            "svdFile": "${userHome}/.pico-sdk/sdk/2.2.0/src/${command:raspberry-pi-pico.getChip}/hardware_regs/${command:raspberry-pi-pico.getChipUppercase}.svd",
+            "runToEntryPoint": "main",
+            // Fix for no_flash binaries, where monitor reset halt doesn't do what is expected
+            // Also works fine for flash binaries
+            "overrideLaunchCommands": [
+                "monitor reset init",
+                "load \"${command:raspberry-pi-pico.launchTargetPath}\""
+            ]
+        },
+    ]
+}
@@ -0,0 +1,43 @@
+{
+    "cmake.showSystemKits": false,
+    "cmake.options.statusBarVisibility": "hidden",
+    "cmake.options.advanced": {
+        "build": {
+            "statusBarVisibility": "hidden"
+        },
+        "launch": {
+            "statusBarVisibility": "hidden"
+        },
+        "debug": {
+            "statusBarVisibility": "hidden"
+        }
+    },
+    "cmake.configureOnEdit": false,
+    "cmake.automaticReconfigure": false,
+    "cmake.configureOnOpen": false,
+    "cmake.generator": "Ninja",
+    "cmake.cmakePath": "${userHome}/.pico-sdk/cmake/v3.31.5/bin/cmake",
+    "C_Cpp.debugShortcut": false,
+    "terminal.integrated.env.windows": {
+        "PICO_SDK_PATH": "${env:USERPROFILE}/.pico-sdk/sdk/2.2.0",
+        "PICO_TOOLCHAIN_PATH": "${env:USERPROFILE}/.pico-sdk/toolchain/14_2_Rel1",
+        "Path": "${env:USERPROFILE}/.pico-sdk/toolchain/14_2_Rel1/bin;${env:USERPROFILE}/.pico-sdk/picotool/2.2.0/picotool;${env:USERPROFILE}/.pico-sdk/cmake/v3.31.5/bin;${env:USERPROFILE}/.pico-sdk/ninja/v1.12.1;${env:PATH}"
+    },
+    "terminal.integrated.env.osx": {
+        "PICO_SDK_PATH": "${env:HOME}/.pico-sdk/sdk/2.2.0",
+        "PICO_TOOLCHAIN_PATH": "${env:HOME}/.pico-sdk/toolchain/14_2_Rel1",
+        "PATH": "${env:HOME}/.pico-sdk/toolchain/14_2_Rel1/bin:${env:HOME}/.pico-sdk/picotool/2.2.0/picotool:${env:HOME}/.pico-sdk/cmake/v3.31.5/bin:${env:HOME}/.pico-sdk/ninja/v1.12.1:${env:PATH}"
+    },
+    "terminal.integrated.env.linux": {
+        "PICO_SDK_PATH": "${env:HOME}/.pico-sdk/sdk/2.2.0",
+        "PICO_TOOLCHAIN_PATH": "${env:HOME}/.pico-sdk/toolchain/14_2_Rel1",
+        "PATH": "${env:HOME}/.pico-sdk/toolchain/14_2_Rel1/bin:${env:HOME}/.pico-sdk/picotool/2.2.0/picotool:${env:HOME}/.pico-sdk/cmake/v3.31.5/bin:${env:HOME}/.pico-sdk/ninja/v1.12.1:${env:PATH}"
+    },
+    "raspberry-pi-pico.cmakeAutoConfigure": true,
+    "raspberry-pi-pico.useCmakeTools": false,
+    "raspberry-pi-pico.cmakePath": "${HOME}/.pico-sdk/cmake/v3.31.5/bin/cmake",
+    "raspberry-pi-pico.ninjaPath": "${HOME}/.pico-sdk/ninja/v1.12.1/ninja",
+    "files.associations": {
+        "stdlib.h": "c"
+    }
+}
@@ -0,0 +1,125 @@
+{
+    "version": "2.0.0",
+    "tasks": [
+        {
+            "label": "Compile Project",
+            "type": "process",
+            "isBuildCommand": true,
+            "dependsOn": "Configure Project",
+            "dependsOrder": "sequence",
+            "command": "${userHome}/.pico-sdk/ninja/v1.12.1/ninja",
+            "args": ["-C", "${workspaceFolder}/build"],
+            "group": "build",
+            "presentation": {
+                "reveal": "always",
+                "panel": "dedicated"
+            },
+            "problemMatcher": "$gcc",
+            "windows": {
+                "command": "${env:USERPROFILE}/.pico-sdk/ninja/v1.12.1/ninja.exe"
+            }
+        },
+        {
+            "label": "Configure Project",
+            "type": "process",
+            "command": "${userHome}/.pico-sdk/cmake/v3.31.5/bin/cmake",
+            "args": [
+                "-S",
+                "${workspaceFolder}",
+                "-B",
+                "${workspaceFolder}/build",
+                "-G",
+                "Ninja"
+            ],
+            "presentation": {
+                "reveal": "always",
+                "panel": "dedicated"
+            },
+            "problemMatcher": "$gcc",
+            "windows": {
+                "command": "${env:USERPROFILE}/.pico-sdk/cmake/v3.31.5/bin/cmake.exe"
+            }
+        },
+        {
+            "label": "Run Project",
+            "type": "process",
+            "command": "${env:HOME}/.pico-sdk/picotool/2.2.0/picotool/picotool",
+            "args": [
+                "load",
+                "${command:raspberry-pi-pico.launchTargetPath}",
+                "-fx"
+            ],
+            "presentation": {
+                "reveal": "always",
+                "panel": "dedicated"
+            },
+            "problemMatcher": [],
+            "windows": {
+                "command": "${env:USERPROFILE}/.pico-sdk/picotool/2.2.0/picotool/picotool.exe"
+            }
+        },
+        {
+            "label": "Flash",
+            "type": "process",
+            "command": "${userHome}/.pico-sdk/openocd/0.12.0+dev/openocd.exe",
+            "args": [
+                "-s",
+                "${userHome}/.pico-sdk/openocd/0.12.0+dev/scripts",
+                "-f",
+                "interface/cmsis-dap.cfg",
+                "-f",
+                "target/${command:raspberry-pi-pico.getTarget}.cfg",
+                "-c",
+                "adapter speed 5000; program \"${command:raspberry-pi-pico.launchTargetPath}\" verify reset exit"
+            ],
+            "problemMatcher": [],
+            "windows": {
+                "command": "${env:USERPROFILE}/.pico-sdk/openocd/0.12.0+dev/openocd.exe",
+            }
+        },
+        {
+            "label": "Rescue Reset",
+            "type": "process",
+            "command": "${userHome}/.pico-sdk/openocd/0.12.0+dev/openocd.exe",
+            "args": [
+                "-s",
+                "${userHome}/.pico-sdk/openocd/0.12.0+dev/scripts",
+                "-f",
+                "interface/cmsis-dap.cfg",
+                "-f",
+                "target/${command:raspberry-pi-pico.getChip}-rescue.cfg",
+                "-c",
+                "adapter speed 5000; reset halt; exit"
+            ],
+            "problemMatcher": [],
+            "windows": {
+                "command": "${env:USERPROFILE}/.pico-sdk/openocd/0.12.0+dev/openocd.exe",
+            }
+        },
+        {
+            "label": "Risc-V Reset (RP2350)",
+            "type": "process",
+            "command": "${userHome}/.pico-sdk/openocd/0.12.0+dev/openocd.exe",
+            "args": [
+                "-s",
+                "${userHome}/.pico-sdk/openocd/0.12.0+dev/scripts",
+                "-c",
+                "set USE_CORE { rv0 rv1 cm0 cm1 }",
+                "-f",
+                "interface/cmsis-dap.cfg",
+                "-f",
+                "target/rp2350.cfg",
+                "-c",
+                "adapter speed 5000; init;",
+                "-c",
+                "write_memory 0x40120158 8 { 0x3 }; echo [format \"Info : ARCHSEL 0x%02x\" [read_memory 0x40120158 8 1]];",
+                "-c",
+                "reset halt; targets rp2350.rv0; echo [format \"Info : ARCHSEL_STATUS 0x%02x\" [read_memory 0x4012015C 8 1]]; exit"
+            ],
+            "problemMatcher": [],
+            "windows": {
+                "command": "${env:USERPROFILE}/.pico-sdk/openocd/0.12.0+dev/openocd.exe",
+            }
+        }
+    ]
+}
@@ -0,0 +1,57 @@
+/**
+ * @file 0x02_blink.c
+ * @brief Blink demonstration: toggle onboard LED every 500 ms
+ * @author Kevin Thomas
+ * @date 2025
+ *
+ * MIT License
+ *
+ * Copyright (c) 2025 Kevin Thomas
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ * -----------------------------------------------------------------------------
+ *
+ * Demonstrates GPIO output control using the blink driver (blink.h / blink.c).
+ * The onboard LED on GPIO 25 is toggled every BLINK_DELAY_MS milliseconds and
+ * the current state is reported over UART.
+ *
+ * Wiring:
+ *   GPIO25 -> Onboard LED (no external wiring needed)
+ */
+
+#include <stdio.h>
+#include "pico/stdlib.h"
+#include "blink.h"
+
+/** @brief GPIO pin for the onboard LED */
+#define LED_PIN        25
+/** @brief Delay between blink toggles in milliseconds */
+#define BLINK_DELAY_MS 500
+
+int main(void) {
+    stdio_init_all();
+    blink_init(LED_PIN);
+    printf("Blink driver initialized on GPIO %d\r\n", LED_PIN);
+    while (true) {
+        blink_toggle(LED_PIN);
+        printf("LED: %s\r\n", blink_get_state(LED_PIN) ? "ON" : "OFF");
+        sleep_ms(BLINK_DELAY_MS);
+    }
+}
@@ -0,0 +1,56 @@
+# Generated Cmake Pico project file
+
+cmake_minimum_required(VERSION 3.13)
+
+set(CMAKE_C_STANDARD 11)
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+# Initialise pico_sdk from installed location
+# (note this can come from environment, CMake cache etc)
+
+# == DO NOT EDIT THE FOLLOWING LINES for the Raspberry Pi Pico VS Code Extension to work ==
+if(WIN32)
+    set(USERHOME $ENV{USERPROFILE})
+else()
+    set(USERHOME $ENV{HOME})
+endif()
+set(sdkVersion 2.2.0)
+set(toolchainVersion 14_2_Rel1)
+set(picotoolVersion 2.2.0)
+set(picoVscode ${USERHOME}/.pico-sdk/cmake/pico-vscode.cmake)
+if (EXISTS ${picoVscode})
+    include(${picoVscode})
+endif()
+# ====================================================================================
+set(PICO_BOARD pico2 CACHE STRING "Board type")
+
+# Pull in Raspberry Pi Pico SDK (must be before project)
+include(pico_sdk_import.cmake)
+
+project(0x02_blink C CXX ASM)
+
+# Initialise the Raspberry Pi Pico SDK
+pico_sdk_init()
+
+# Add executable. Default name is the project name, version 0.1
+
+add_executable(0x02_blink 0x02_blink.c blink.c)
+
+pico_set_program_name(0x02_blink "0x02_blink")
+pico_set_program_version(0x02_blink "0.1")
+
+# Modify the below lines to enable/disable output over UART/USB
+pico_enable_stdio_uart(0x02_blink 1)
+pico_enable_stdio_usb(0x02_blink 0)
+
+# Add the standard library to the build
+target_link_libraries(0x02_blink
+        pico_stdlib)
+
+# Add the standard include files to the build
+target_include_directories(0x02_blink PRIVATE
+        ${CMAKE_CURRENT_LIST_DIR}
+)
+
+pico_add_extra_outputs(0x02_blink)
@@ -0,0 +1,54 @@
+/**
+ * @file blink.c
+ * @brief Implementation of the GPIO output / LED blink driver
+ * @author Kevin Thomas
+ * @date 2025
+ *
+ * MIT License
+ *
+ * Copyright (c) 2025 Kevin Thomas
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include "blink.h"
+#include "pico/stdlib.h"
+#include "hardware/gpio.h"
+
+void blink_init(uint32_t pin) {
+    gpio_init(pin);
+    gpio_set_dir(pin, GPIO_OUT);
+    gpio_put(pin, false);
+}
+
+void blink_on(uint32_t pin) {
+    gpio_put(pin, true);
+}
+
+void blink_off(uint32_t pin) {
+    gpio_put(pin, false);
+}
+
+void blink_toggle(uint32_t pin) {
+    gpio_put(pin, !gpio_get(pin));
+}
+
+bool blink_get_state(uint32_t pin) {
+    return (bool)gpio_get(pin);
+}
@@ -0,0 +1,78 @@
+/**
+ * @file blink.h
+ * @brief Header for GPIO output / LED blink driver
+ * @author Kevin Thomas
+ * @date 2025
+ *
+ * MIT License
+ *
+ * Copyright (c) 2025 Kevin Thomas
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#ifndef BLINK_H
+#define BLINK_H
+
+#include <stdint.h>
+#include <stdbool.h>
+
+/**
+ * @brief Initialize a GPIO pin as a push-pull digital output
+ *
+ * Calls gpio_init() and gpio_set_dir() to configure the pin for output.
+ * The initial drive level is low (LED off).
+ *
+ * @param pin GPIO pin number to configure as a digital output
+ */
+void blink_init(uint32_t pin);
+
+/**
+ * @brief Drive the output pin high (LED on)
+ *
+ * @param pin GPIO pin number previously initialized with blink_init()
+ */
+void blink_on(uint32_t pin);
+
+/**
+ * @brief Drive the output pin low (LED off)
+ *
+ * @param pin GPIO pin number previously initialized with blink_init()
+ */
+void blink_off(uint32_t pin);
+
+/**
+ * @brief Toggle the current state of the output pin
+ *
+ * Reads the current GPIO output level and inverts it. If the LED was on
+ * it is turned off, and vice versa.
+ *
+ * @param pin GPIO pin number previously initialized with blink_init()
+ */
+void blink_toggle(uint32_t pin);
+
+/**
+ * @brief Query the current drive state of the output pin
+ *
+ * @param pin GPIO pin number previously initialized with blink_init()
+ * @return bool true if the pin is driven high, false if driven low
+ */
+bool blink_get_state(uint32_t pin);
+
+#endif // BLINK_H
@@ -0,0 +1,121 @@
+# This is a copy of <PICO_SDK_PATH>/external/pico_sdk_import.cmake
+
+# This can be dropped into an external project to help locate this SDK
+# It should be include()ed prior to project()
+
+# Copyright 2020 (c) 2020 Raspberry Pi (Trading) Ltd.
+#
+# Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
+# following conditions are met:
+#
+# 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following
+# disclaimer.
+#
+# 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following
+# disclaimer in the documentation and/or other materials provided with the distribution.
+#
+# 3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products
+# derived from this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
+# INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+if (DEFINED ENV{PICO_SDK_PATH} AND (NOT PICO_SDK_PATH))
+    set(PICO_SDK_PATH $ENV{PICO_SDK_PATH})
+    message("Using PICO_SDK_PATH from environment ('${PICO_SDK_PATH}')")
+endif ()
+
+if (DEFINED ENV{PICO_SDK_FETCH_FROM_GIT} AND (NOT PICO_SDK_FETCH_FROM_GIT))
+    set(PICO_SDK_FETCH_FROM_GIT $ENV{PICO_SDK_FETCH_FROM_GIT})
+    message("Using PICO_SDK_FETCH_FROM_GIT from environment ('${PICO_SDK_FETCH_FROM_GIT}')")
+endif ()
+
+if (DEFINED ENV{PICO_SDK_FETCH_FROM_GIT_PATH} AND (NOT PICO_SDK_FETCH_FROM_GIT_PATH))
+    set(PICO_SDK_FETCH_FROM_GIT_PATH $ENV{PICO_SDK_FETCH_FROM_GIT_PATH})
+    message("Using PICO_SDK_FETCH_FROM_GIT_PATH from environment ('${PICO_SDK_FETCH_FROM_GIT_PATH}')")
+endif ()
+
+if (DEFINED ENV{PICO_SDK_FETCH_FROM_GIT_TAG} AND (NOT PICO_SDK_FETCH_FROM_GIT_TAG))
+    set(PICO_SDK_FETCH_FROM_GIT_TAG $ENV{PICO_SDK_FETCH_FROM_GIT_TAG})
+    message("Using PICO_SDK_FETCH_FROM_GIT_TAG from environment ('${PICO_SDK_FETCH_FROM_GIT_TAG}')")
+endif ()
+
+if (PICO_SDK_FETCH_FROM_GIT AND NOT PICO_SDK_FETCH_FROM_GIT_TAG)
+  set(PICO_SDK_FETCH_FROM_GIT_TAG "master")
+  message("Using master as default value for PICO_SDK_FETCH_FROM_GIT_TAG")
+endif()
+
+set(PICO_SDK_PATH "${PICO_SDK_PATH}" CACHE PATH "Path to the Raspberry Pi Pico SDK")
+set(PICO_SDK_FETCH_FROM_GIT "${PICO_SDK_FETCH_FROM_GIT}" CACHE BOOL "Set to ON to fetch copy of SDK from git if not otherwise locatable")
+set(PICO_SDK_FETCH_FROM_GIT_PATH "${PICO_SDK_FETCH_FROM_GIT_PATH}" CACHE FILEPATH "location to download SDK")
+set(PICO_SDK_FETCH_FROM_GIT_TAG "${PICO_SDK_FETCH_FROM_GIT_TAG}" CACHE FILEPATH "release tag for SDK")
+
+if (NOT PICO_SDK_PATH)
+    if (PICO_SDK_FETCH_FROM_GIT)
+        include(FetchContent)
+        set(FETCHCONTENT_BASE_DIR_SAVE ${FETCHCONTENT_BASE_DIR})
+        if (PICO_SDK_FETCH_FROM_GIT_PATH)
+            get_filename_component(FETCHCONTENT_BASE_DIR "${PICO_SDK_FETCH_FROM_GIT_PATH}" REALPATH BASE_DIR "${CMAKE_SOURCE_DIR}")
+        endif ()
+        FetchContent_Declare(
+                pico_sdk
+                GIT_REPOSITORY https://github.com/raspberrypi/pico-sdk
+                GIT_TAG ${PICO_SDK_FETCH_FROM_GIT_TAG}
+        )
+
+        if (NOT pico_sdk)
+            message("Downloading Raspberry Pi Pico SDK")
+            # GIT_SUBMODULES_RECURSE was added in 3.17
+            if (${CMAKE_VERSION} VERSION_GREATER_EQUAL "3.17.0")
+                FetchContent_Populate(
+                        pico_sdk
+                        QUIET
+                        GIT_REPOSITORY https://github.com/raspberrypi/pico-sdk
+                        GIT_TAG ${PICO_SDK_FETCH_FROM_GIT_TAG}
+                        GIT_SUBMODULES_RECURSE FALSE
+
+                        SOURCE_DIR ${FETCHCONTENT_BASE_DIR}/pico_sdk-src
+                        BINARY_DIR ${FETCHCONTENT_BASE_DIR}/pico_sdk-build
+                        SUBBUILD_DIR ${FETCHCONTENT_BASE_DIR}/pico_sdk-subbuild
+                )
+            else ()
+                FetchContent_Populate(
+                        pico_sdk
+                        QUIET
+                        GIT_REPOSITORY https://github.com/raspberrypi/pico-sdk
+                        GIT_TAG ${PICO_SDK_FETCH_FROM_GIT_TAG}
+
+                        SOURCE_DIR ${FETCHCONTENT_BASE_DIR}/pico_sdk-src
+                        BINARY_DIR ${FETCHCONTENT_BASE_DIR}/pico_sdk-build
+                        SUBBUILD_DIR ${FETCHCONTENT_BASE_DIR}/pico_sdk-subbuild
+                )
+            endif ()
+
+            set(PICO_SDK_PATH ${pico_sdk_SOURCE_DIR})
+        endif ()
+        set(FETCHCONTENT_BASE_DIR ${FETCHCONTENT_BASE_DIR_SAVE})
+    else ()
+        message(FATAL_ERROR
+                "SDK location was not specified. Please set PICO_SDK_PATH or set PICO_SDK_FETCH_FROM_GIT to on to fetch from git."
+                )
+    endif ()
+endif ()
+
+get_filename_component(PICO_SDK_PATH "${PICO_SDK_PATH}" REALPATH BASE_DIR "${CMAKE_BINARY_DIR}")
+if (NOT EXISTS ${PICO_SDK_PATH})
+    message(FATAL_ERROR "Directory '${PICO_SDK_PATH}' not found")
+endif ()
+
+set(PICO_SDK_INIT_CMAKE_FILE ${PICO_SDK_PATH}/pico_sdk_init.cmake)
+if (NOT EXISTS ${PICO_SDK_INIT_CMAKE_FILE})
+    message(FATAL_ERROR "Directory '${PICO_SDK_PATH}' does not appear to contain the Raspberry Pi Pico SDK")
+endif ()
+
+set(PICO_SDK_PATH ${PICO_SDK_PATH} CACHE PATH "Path to the Raspberry Pi Pico SDK" FORCE)
+
+include(${PICO_SDK_INIT_CMAKE_FILE})
@@ -0,0 +1,45 @@
+{
+    "configurations": [
+        {
+            "name": "ARM GCC",
+            "includePath": [
+                "${workspaceFolder}/Inc/**"
+            ],
+            "defines": [
+                "__GNUC__",
+                "__ARM_ARCH_8M_MAIN__",
+                "__ARMCC_VERSION"
+            ],
+            "compilerPath": "${userHome}/.pico-sdk/toolchain/14_2_Rel1/bin/arm-none-eabi-gcc",
+            "compileCommands": "${workspaceFolder}/compile_commands.json",
+            "cStandard": "c11",
+            "cppStandard": "c++17",
+            "intelliSenseMode": "gcc-arm",
+            "compilerArgs": [
+                "-mcpu=cortex-m33",
+                "-mthumb"
+            ]
+        },
+        {
+            "name": "ARM GCC (Windows)",
+            "includePath": [
+                "${workspaceFolder}/Inc/**"
+            ],
+            "defines": [
+                "__GNUC__",
+                "__ARM_ARCH_8M_MAIN__",
+                "__ARMCC_VERSION"
+            ],
+            "compilerPath": "${env:USERPROFILE}/.pico-sdk/toolchain/14_2_Rel1/bin/arm-none-eabi-gcc.exe",
+            "compileCommands": "${workspaceFolder}/compile_commands.json",
+            "cStandard": "c11",
+            "cppStandard": "c++17",
+            "intelliSenseMode": "gcc-arm",
+            "compilerArgs": [
+                "-mcpu=cortex-m33",
+                "-mthumb"
+            ]
+        }
+    ],
+    "version": 4
+}
@@ -0,0 +1,9 @@
+{
+    "recommendations": [
+        "marus25.cortex-debug",
+        "ms-vscode.cpptools",
+        "ms-vscode.cpptools-extension-pack",
+        "ms-vscode.vscode-serial-monitor",
+        "raspberry-pi.raspberry-pi-pico"
+    ]
+}
@@ -0,0 +1,47 @@
+{
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "Debug RP2350 (OpenOCD)",
+            "cwd": "${workspaceFolder}",
+            "executable": "${workspaceFolder}/build/blink.elf",
+            "request": "launch",
+            "type": "cortex-debug",
+            "servertype": "openocd",
+            "serverpath": "${userHome}/.pico-sdk/openocd/0.12.0+dev/openocd",
+            "searchDir": [
+                "${userHome}/.pico-sdk/openocd/0.12.0+dev/scripts"
+            ],
+            "gdbPath": "${userHome}/.pico-sdk/toolchain/14_2_Rel1/bin/arm-none-eabi-gdb",
+            "device": "RP2350",
+            "configFiles": [
+                "interface/cmsis-dap.cfg",
+                "target/rp2350.cfg"
+            ],
+            "svdFile": "${userHome}/.pico-sdk/sdk/2.2.0/src/rp2350/hardware_regs/RP2350.svd",
+            "overrideLaunchCommands": [
+                "set arch armv8-m.main",
+                "set output-radix 16",
+                "monitor reset init",
+                "load",
+                "monitor reset halt"
+            ],
+            "openOCDPreConfigLaunchCommands": [
+                "set USE_CORE { cm0 cm1 }"
+            ],
+            "openOCDLaunchCommands": [
+                "adapter speed 5000"
+            ],
+            "preLaunchTask": "Compile Project",
+            "showDevDebugOutput": "raw",
+            "windows": {
+                "serverpath": "${env:USERPROFILE}/.pico-sdk/openocd/0.12.0+dev/openocd.exe",
+                "searchDir": [
+                    "${env:USERPROFILE}/.pico-sdk/openocd/0.12.0+dev/scripts"
+                ],
+                "gdbPath": "${env:USERPROFILE}/.pico-sdk/toolchain/14_2_Rel1/bin/arm-none-eabi-gdb.exe",
+                "svdFile": "${env:USERPROFILE}/.pico-sdk/sdk/2.2.0/src/rp2350/hardware_regs/RP2350.svd"
+            }
+        }
+    ]
+}
@@ -0,0 +1,40 @@
+{
+    "cmake.showSystemKits": false,
+    "cmake.options.statusBarVisibility": "hidden",
+    "cmake.options.advanced": {
+        "build": {
+            "statusBarVisibility": "hidden"
+        },
+        "launch": {
+            "statusBarVisibility": "hidden"
+        },
+        "debug": {
+            "statusBarVisibility": "hidden"
+        }
+    },
+    "cmake.configureOnEdit": false,
+    "cmake.automaticReconfigure": false,
+    "cmake.configureOnOpen": false,
+    "cmake.generator": "Ninja",
+    "cmake.cmakePath": "${userHome}/.pico-sdk/cmake/v3.31.5/bin/cmake",
+    "C_Cpp.debugShortcut": false,
+    "terminal.integrated.env.windows": {
+        "PICO_SDK_PATH": "${env:USERPROFILE}/.pico-sdk/sdk/2.2.0",
+        "PICO_TOOLCHAIN_PATH": "${env:USERPROFILE}/.pico-sdk/toolchain/14_2_Rel1",
+        "Path": "${env:USERPROFILE}/.pico-sdk/toolchain/14_2_Rel1/bin;${env:USERPROFILE}/.pico-sdk/picotool/2.2.0-a4/picotool;${env:USERPROFILE}/.pico-sdk/cmake/v3.31.5/bin;${env:USERPROFILE}/.pico-sdk/ninja/v1.12.1;${env:PATH}"
+    },
+    "terminal.integrated.env.osx": {
+        "PICO_SDK_PATH": "${env:HOME}/.pico-sdk/sdk/2.2.0",
+        "PICO_TOOLCHAIN_PATH": "${env:HOME}/.pico-sdk/toolchain/14_2_Rel1",
+        "PATH": "${env:HOME}/.pico-sdk/toolchain/14_2_Rel1/bin:${env:HOME}/.pico-sdk/picotool/2.2.0-a4/picotool:${env:HOME}/.pico-sdk/cmake/v3.31.5/bin:${env:HOME}/.pico-sdk/ninja/v1.12.1:${env:PATH}"
+    },
+    "terminal.integrated.env.linux": {
+        "PICO_SDK_PATH": "${env:HOME}/.pico-sdk/sdk/2.2.0",
+        "PICO_TOOLCHAIN_PATH": "${env:HOME}/.pico-sdk/toolchain/14_2_Rel1",
+        "PATH": "${env:HOME}/.pico-sdk/toolchain/14_2_Rel1/bin:${env:HOME}/.pico-sdk/picotool/2.2.0-a4/picotool:${env:HOME}/.pico-sdk/cmake/v3.31.5/bin:${env:HOME}/.pico-sdk/ninja/v1.12.1:${env:PATH}"
+    },
+    "raspberry-pi-pico.cmakeAutoConfigure": true,
+    "raspberry-pi-pico.useCmakeTools": false,
+    "raspberry-pi-pico.cmakePath": "${HOME}/.pico-sdk/cmake/v3.31.5/bin/cmake",
+    "raspberry-pi-pico.ninjaPath": "${HOME}/.pico-sdk/ninja/v1.12.1/ninja"
+}
@@ -0,0 +1,128 @@
+{
+    "version": "2.0.0",
+    "tasks": [
+        {
+            "label": "Compile Project",
+            "type": "shell",
+            "command": "make",
+            "group": {
+                "kind": "build",
+                "isDefault": true
+            },
+            "presentation": {
+                "reveal": "always",
+                "panel": "dedicated"
+            },
+            "problemMatcher": "$gcc",
+            "windows": {
+                "command": ".\\build.bat"
+            }
+        },
+        {
+            "label": "Clean Project",
+            "type": "shell",
+            "command": "make clean",
+            "group": "build",
+            "presentation": {
+                "reveal": "always",
+                "panel": "dedicated"
+            },
+            "problemMatcher": [],
+            "windows": {
+                "command": ".\\clean.bat"
+            }
+        },
+        {
+            "label": "Run Project",
+            "type": "shell",
+            "command": "${userHome}/.pico-sdk/picotool/2.2.0-a4/picotool/picotool",
+            "args": [
+                "load",
+                "build/blink.uf2",
+                "-fx"
+            ],
+            "presentation": {
+                "reveal": "always",
+                "panel": "dedicated"
+            },
+            "problemMatcher": [],
+            "dependsOn": [
+                "Compile Project"
+            ],
+            "windows": {
+                "command": "${env:USERPROFILE}/.pico-sdk/picotool/2.2.0-a4/picotool/picotool.exe"
+            }
+        },
+        {
+            "label": "Flash",
+            "type": "shell",
+            "command": "${userHome}/.pico-sdk/openocd/0.12.0+dev/openocd",
+            "args": [
+                "-s",
+                "${userHome}/.pico-sdk/openocd/0.12.0+dev/scripts",
+                "-f",
+                "interface/cmsis-dap.cfg",
+                "-f",
+                "target/rp2350.cfg",
+                "-c",
+                "adapter speed 5000; program build/blink.elf verify reset exit"
+            ],
+            "problemMatcher": [],
+            "dependsOn": [
+                "Compile Project"
+            ],
+            "windows": {
+                "command": "${env:USERPROFILE}/.pico-sdk/openocd/0.12.0+dev/openocd.exe"
+            }
+        },
+        {
+            "label": "Rescue Reset",
+            "type": "process",
+            "command": "${userHome}/.pico-sdk/openocd/0.12.0+dev/openocd",
+            "args": [
+                "-s",
+                "${userHome}/.pico-sdk/openocd/0.12.0+dev/scripts",
+                "-f",
+                "interface/cmsis-dap.cfg",
+                "-f",
+                "target/${command:raspberry-pi-pico.getChip}-rescue.cfg",
+                "-c",
+                "adapter speed 5000; reset halt; exit"
+            ],
+            "problemMatcher": [],
+            "windows": {
+                "command": "${env:USERPROFILE}/.pico-sdk/openocd/0.12.0+dev/openocd.exe"
+            }
+        },
+        {
+            "label": "RISC-V Reset (RP2350)",
+            "type": "process",
+            "command": "${userHome}/.pico-sdk/openocd/0.12.0+dev/openocd",
+            "args": [
+                "-s",
+                "${userHome}/.pico-sdk/openocd/0.12.0+dev/scripts",
+                "-c",
+                "set USE_CORE { rv0 rv1 cm0 cm1 }",
+                "-f",
+                "interface/cmsis-dap.cfg",
+                "-f",
+                "target/rp2350.cfg",
+                "-c",
+                "adapter speed 5000; init;",
+                "-c",
+                "write_memory 0x40120158 8 { 0x3 }; echo [format \"Info : ARCHSEL 0x%02x\" [read_memory 0x40120158 8 1]];",
+                "-c",
+                "reset halt; targets rp2350.rv0; echo [format \"Info : ARCHSEL_STATUS 0x%02x\" [read_memory 0x4012015C 8 1]]; exit"
+            ],
+            "problemMatcher": [],
+            "windows": {
+                "command": "${env:USERPROFILE}/.pico-sdk/openocd/0.12.0+dev/openocd.exe"
+            }
+        }
+    ]
+}
+],
+"problemMatcher": []
+}
+]
+}
@@ -0,0 +1,203 @@
+/**
+ * @file rp2350.h
+ * @brief RP2350 Device Peripheral Access Layer Header File.
+ * @author Kevin Thomas
+ * @date 2026
+ *
+ * Memory-mapped register structures and peripheral base addresses
+ * for the RP2350 microcontroller (Cortex-M33 dual-core). All
+ * register offsets verified against the RP2350 datasheet
+ * (RP-008373-DS-2).
+ *
+ * MIT License
+ *
+ * Copyright (c) 2026 Kevin Thomas
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#ifndef __RP2350_H
+#define __RP2350_H
+
+#include <stdint.h>
+#include <stdbool.h>
+
+/*!< Defines 'read / write' permissions */
+#define __IO volatile
+
+/*!< Stack addresses */
+#define STACK_TOP              0x20082000UL
+#define STACK_LIMIT            0x2007A000UL
+
+/*!< Memory map */
+#define XIP_BASE               0x10000000UL
+#define SRAM_BASE              0x20000000UL
+#define SIO_BASE               0xD0000000UL
+#define PPB_BASE               0xE0000000UL
+
+/*!< APB peripherals */
+#define CLOCKS_BASE            0x40010000UL
+#define RESETS_BASE            0x40020000UL
+#define IO_BANK0_BASE          0x40028000UL
+#define PADS_BANK0_BASE        0x40038000UL
+#define XOSC_BASE              0x40048000UL
+#define UART0_BASE             0x40070000UL
+
+/**
+  * @brief XOSC (External Crystal Oscillator)
+  */
+typedef struct
+{
+  __IO uint32_t CTRL;          // Control register                               Address offset: 0x00
+  __IO uint32_t STATUS;        // Status register                                Address offset: 0x04
+  __IO uint32_t DORMANT;       // Dormant mode                                   Address offset: 0x08
+  __IO uint32_t STARTUP;       // Startup delay                                  Address offset: 0x0C
+  __IO uint32_t COUNT;         // Frequency count                                Address offset: 0x10
+} XOSC_TypeDef;
+
+/**
+  * @brief CLOCKS
+  */
+typedef struct
+{
+  __IO uint32_t RESERVED0[18]; // Other clock registers                          Address offset: 0x00-0x44
+  __IO uint32_t CLK_PERI_CTRL; // Peripheral clock control                       Address offset: 0x48
+} CLOCKS_TypeDef;
+
+/**
+  * @brief RESETS
+  */
+typedef struct
+{
+  __IO uint32_t RESET;         // Reset control                                  Address offset: 0x00
+  __IO uint32_t WDSEL;         // Watchdog select                                Address offset: 0x04
+  __IO uint32_t RESET_DONE;    // Reset done status                              Address offset: 0x08
+} RESETS_TypeDef;
+
+/**
+  * @brief IO_BANK0 GPIO Control (one per GPIO)
+  */
+typedef struct
+{
+  __IO uint32_t STATUS;        // GPIO status                                    Address offset: 0x00
+  __IO uint32_t CTRL;          // GPIO control                                   Address offset: 0x04
+} IO_BANK0_GPIO_TypeDef;
+
+/**
+  * @brief IO_BANK0
+  */
+typedef struct
+{
+  IO_BANK0_GPIO_TypeDef GPIO[30]; // GPIO 0-29 status/ctrl pairs                 Address offset: 0x000-0x0E8
+} IO_BANK0_TypeDef;
+
+/**
+  * @brief PADS_BANK0
+  */
+typedef struct
+{
+  __IO uint32_t VOLTAGE_SELECT; // Voltage select                                Address offset: 0x00
+  __IO uint32_t GPIO[30];      // GPIO 0-29 pad control                          Address offset: 0x04-0x78
+} PADS_BANK0_TypeDef;
+
+/**
+  * @brief Peripheral Definitions
+  */
+#define XOSC                   ((XOSC_TypeDef *) XOSC_BASE)
+#define CLOCKS                 ((CLOCKS_TypeDef *) CLOCKS_BASE)
+#define RESETS                 ((RESETS_TypeDef *) RESETS_BASE)
+#define IO_BANK0               ((IO_BANK0_TypeDef *) IO_BANK0_BASE)
+#define PADS_BANK0             ((PADS_BANK0_TypeDef *) PADS_BANK0_BASE)
+#define SIO                    ((volatile uint32_t *) SIO_BASE)
+#define CPACR                  ((volatile uint32_t *) (PPB_BASE + 0x0ED88UL))
+
+/**
+  * @brief XOSC bit definitions
+  */
+#define XOSC_STATUS_STABLE_SHIFT     31U
+
+/**
+  * @brief CPACR bit definitions
+  */
+#define CPACR_CP0_SHIFT              0U
+#define CPACR_CP1_SHIFT              1U
+
+/**
+  * @brief CLOCKS bit definitions
+  */
+#define CLK_PERI_CTRL_ENABLE_SHIFT   11U
+#define CLK_PERI_CTRL_AUXSRC_SHIFT   5U
+#define CLK_PERI_CTRL_AUXSRC_XOSC   4U
+
+/**
+  * @brief RESETS bit definitions
+  */
+#define RESETS_RESET_IO_BANK0_SHIFT  6U
+#define RESETS_RESET_UART0_SHIFT     26U
+
+/**
+  * @brief IO_BANK0 bit definitions
+  */
+#define IO_BANK0_CTRL_FUNCSEL_MASK   0x1FU
+#define IO_BANK0_CTRL_FUNCSEL_UART   0x02U
+#define IO_BANK0_CTRL_FUNCSEL_SIO    0x05U
+
+/**
+  * @brief PADS_BANK0 bit definitions
+  */
+#define PADS_BANK0_OD_SHIFT          7U
+#define PADS_BANK0_IE_SHIFT          6U
+#define PADS_BANK0_ISO_SHIFT         8U
+
+/**
+  * @brief UART register offsets (word indices from UART0_BASE)
+  */
+#define UART_DR_OFFSET               (0x000U / 4U)
+#define UART_FR_OFFSET               (0x018U / 4U)
+#define UART_IBRD_OFFSET             (0x024U / 4U)
+#define UART_FBRD_OFFSET             (0x028U / 4U)
+#define UART_LCR_H_OFFSET           (0x02CU / 4U)
+#define UART_CR_OFFSET               (0x030U / 4U)
+
+/**
+  * @brief UART flag register bit definitions
+  */
+#define UART_FR_TXFF_MASK            32U
+#define UART_FR_RXFE_MASK            16U
+
+/**
+  * @brief UART line control and enable values
+  */
+#define UART_LCR_H_8N1_FIFO         0x70U
+#define UART_CR_ENABLE               ((3U << 8) | 1U)
+
+/**
+  * @brief GPIO pin definitions
+  */
+#define LED_PIN                      25U
+
+/**
+  * @brief SIO GPIO register offsets (word indices from SIO_BASE)
+  */
+#define SIO_GPIO_IN_OFFSET           (0x004U / 4U)
+#define SIO_GPIO_OUT_SET_OFFSET      (0x018U / 4U)
+#define SIO_GPIO_OUT_CLR_OFFSET      (0x020U / 4U)
+#define SIO_GPIO_OUT_XOR_OFFSET      (0x028U / 4U)
+#define SIO_GPIO_OE_SET_OFFSET       (0x038U / 4U)
+
+#endif /* __RP2350_H */
@@ -0,0 +1,43 @@
+/**
+ * @file rp2350_delay.h
+ * @brief Delay driver header for RP2350.
+ * @author Kevin Thomas
+ * @date 2026
+ *
+ * Millisecond busy-wait delay calibrated for a 12 MHz clock.
+ *
+ * MIT License
+ *
+ * Copyright (c) 2026 Kevin Thomas
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#ifndef __RP2350_DELAY_H
+#define __RP2350_DELAY_H
+
+#include "rp2350.h"
+
+/**
+  * @brief  Delay for the specified number of milliseconds.
+  * @param  ms number of milliseconds to delay
+  * @retval None
+  */
+void delay_ms(uint32_t ms);
+
+#endif /* __RP2350_DELAY_H */
@@ -0,0 +1,72 @@
+/**
+ * @file rp2350_gpio.h
+ * @brief GPIO driver header for RP2350.
+ * @author Kevin Thomas
+ * @date 2026
+ *
+ * SIO-based GPIO configuration, set, clear, toggle, and read
+ * functions for the RP2350 GPIO pins 0-29.
+ *
+ * MIT License
+ *
+ * Copyright (c) 2026 Kevin Thomas
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#ifndef __RP2350_GPIO_H
+#define __RP2350_GPIO_H
+
+#include "rp2350.h"
+
+/**
+  * @brief  Configure a GPIO pin as SIO output.
+  * @param  gpio_num GPIO pin number (0-29)
+  * @retval None
+  */
+void gpio_config(uint32_t gpio_num);
+
+/**
+  * @brief  Drive a GPIO output high.
+  * @param  gpio_num GPIO pin number (0-29)
+  * @retval None
+  */
+void gpio_set(uint32_t gpio_num);
+
+/**
+  * @brief  Drive a GPIO output low.
+  * @param  gpio_num GPIO pin number (0-29)
+  * @retval None
+  */
+void gpio_clear(uint32_t gpio_num);
+
+/**
+  * @brief  Toggle a GPIO output.
+  * @param  gpio_num GPIO pin number (0-29)
+  * @retval None
+  */
+void gpio_toggle(uint32_t gpio_num);
+
+/**
+  * @brief  Read the current input level of a GPIO pin.
+  * @param  gpio_num GPIO pin number (0-29)
+  * @retval bool true if pin is high, false if low
+  */
+bool gpio_get(uint32_t gpio_num);
+
+#endif /* __RP2350_GPIO_H */
@@ -0,0 +1,72 @@
+/**
+ * @file rp2350_led.h
+ * @brief LED driver header for RP2350.
+ * @author Kevin Thomas
+ * @date 2026
+ *
+ * High-level GPIO output / LED driver wrapping the
+ * low-level GPIO functions.
+ *
+ * MIT License
+ *
+ * Copyright (c) 2026 Kevin Thomas
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#ifndef __RP2350_LED_H
+#define __RP2350_LED_H
+
+#include "rp2350.h"
+
+/**
+  * @brief  Initialize a GPIO pin as a push-pull digital output.
+  * @param  pin GPIO pin number to configure
+  * @retval None
+  */
+void led_init(uint32_t pin);
+
+/**
+  * @brief  Drive the output pin high (LED on).
+  * @param  pin GPIO pin number
+  * @retval None
+  */
+void led_on(uint32_t pin);
+
+/**
+  * @brief  Drive the output pin low (LED off).
+  * @param  pin GPIO pin number
+  * @retval None
+  */
+void led_off(uint32_t pin);
+
+/**
+  * @brief  Toggle the current state of the output pin.
+  * @param  pin GPIO pin number
+  * @retval None
+  */
+void led_toggle(uint32_t pin);
+
+/**
+  * @brief  Query the current drive state of the output pin.
+  * @param  pin GPIO pin number
+  * @retval bool true if the pin is driven high, false if low
+  */
+bool led_get_state(uint32_t pin);
+
+#endif /* __RP2350_LED_H */
@@ -0,0 +1,42 @@
+/**
+ * @file rp2350_reset.h
+ * @brief Reset controller driver header for RP2350.
+ * @author Kevin Thomas
+ * @date 2026
+ *
+ * Provides subsystem reset release for IO_BANK0.
+ *
+ * MIT License
+ *
+ * Copyright (c) 2026 Kevin Thomas
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#ifndef __RP2350_RESET_H
+#define __RP2350_RESET_H
+
+#include "rp2350.h"
+
+/**
+  * @brief  Release IO_BANK0 from reset and wait until ready.
+  * @retval None
+  */
+void reset_init_subsystem(void);
+
+#endif /* __RP2350_RESET_H */
@@ -0,0 +1,42 @@
+/**
+ * @file rp2350_reset_handler.h
+ * @brief Reset handler header for RP2350.
+ * @author Kevin Thomas
+ * @date 2026
+ *
+ * Entry point after reset. Performs stack initialization, XOSC
+ * setup, subsystem reset release, UART initialization,
+ * and branches to main().
+ *
+ * MIT License
+ *
+ * Copyright (c) 2026 Kevin Thomas
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#ifndef __RP2350_RESET_HANDLER_H
+#define __RP2350_RESET_HANDLER_H
+
+/**
+  * @brief  Reset handler entry point (naked, noreturn).
+  * @retval None
+  */
+void Reset_Handler(void) __attribute__((noreturn));
+
+#endif /* __RP2350_RESET_HANDLER_H */
@@ -0,0 +1,43 @@
+/**
+ * @file rp2350_stack.h
+ * @brief Stack pointer initialization header for RP2350.
+ * @author Kevin Thomas
+ * @date 2026
+ *
+ * Sets MSP, PSP, MSPLIM, and PSPLIM from the STACK_TOP and
+ * STACK_LIMIT values defined in rp2350.h.
+ *
+ * MIT License
+ *
+ * Copyright (c) 2026 Kevin Thomas
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#ifndef __RP2350_STACK_H
+#define __RP2350_STACK_H
+
+#include "rp2350.h"
+
+/**
+  * @brief  Initialize MSP, PSP, MSPLIM, and PSPLIM stack pointers.
+  * @retval None
+  */
+void stack_init(void);
+
+#endif /* __RP2350_STACK_H */
@@ -0,0 +1,82 @@
+/**
+ * @file rp2350_uart.h
+ * @brief UART0 driver header for RP2350.
+ * @author Kevin Thomas
+ * @date 2026
+ *
+ * Bare-metal UART0 driver supporting TX/RX on GPIO 0/1 at
+ * 115200 baud (12 MHz XOSC clock).
+ *
+ * MIT License
+ *
+ * Copyright (c) 2026 Kevin Thomas
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#ifndef __RP2350_UART_H
+#define __RP2350_UART_H
+
+#include "rp2350.h"
+
+/**
+  * @brief  Release UART0 from reset and wait until ready.
+  * @retval None
+  */
+void uart_release_reset(void);
+
+/**
+  * @brief  Initialize UART0 pins, baud rate, line control, and enable.
+  * @retval None
+  */
+void uart_init(void);
+
+/**
+  * @brief  Check whether a received byte is waiting in the UART FIFO.
+  * @retval bool true if at least one byte is available
+  */
+bool uart_is_readable(void);
+
+/**
+  * @brief  Read one character from UART0 (blocking).
+  * @retval char the received character
+  */
+char uart_getchar(void);
+
+/**
+  * @brief  Transmit one character over UART0 (blocking).
+  * @param  c character to transmit
+  * @retval None
+  */
+void uart_putchar(char c);
+
+/**
+  * @brief  Transmit a null-terminated string over UART0.
+  * @param  str pointer to the string to send
+  * @retval None
+  */
+void uart_puts(const char *str);
+
+/**
+  * @brief  Convert a lowercase ASCII character to uppercase.
+  * @param  c input character
+  * @retval char uppercase equivalent or original character
+  */
+char uart_to_upper(char c);
+
+#endif /* __RP2350_UART_H */
@@ -0,0 +1,49 @@
+/**
+ * @file rp2350_xosc.h
+ * @brief XOSC driver header for RP2350.
+ * @author Kevin Thomas
+ * @date 2026
+ *
+ * External crystal oscillator initialization and peripheral
+ * clock enable using the XOSC registers.
+ *
+ * MIT License
+ *
+ * Copyright (c) 2026 Kevin Thomas
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#ifndef __RP2350_XOSC_H
+#define __RP2350_XOSC_H
+
+#include "rp2350.h"
+
+/**
+  * @brief  Initialize the external crystal oscillator and wait until stable.
+  * @retval None
+  */
+void xosc_init(void);
+
+/**
+  * @brief  Enable the XOSC peripheral clock via CLK_PERI_CTRL.
+  * @retval None
+  */
+void xosc_enable_peri_clk(void);
+
+#endif /* __RP2350_XOSC_H */
@@ -0,0 +1,86 @@
+# ------------------------------------------------------------------------------
+# @file    Makefile
+# @author  Kevin Thomas
+# @brief   Build script for RP2350 bare-metal C blink driver.
+#
+#          Compiles, links, and generates UF2 firmware for the RP2350.
+# ------------------------------------------------------------------------------
+
+# OS detection
+ifeq ($(OS),Windows_NT)
+  MKDIR = if not exist $(subst /,\\,$(BUILD_DIR)) mkdir $(subst /,\\,$(BUILD_DIR))
+  RM    = if exist $(subst /,\\,$(BUILD_DIR)) rmdir /s /q $(subst /,\\,$(BUILD_DIR))
+else
+  MKDIR = mkdir -p $(BUILD_DIR)
+  RM    = rm -rf $(BUILD_DIR)
+endif
+
+# Toolchain
+CC      = arm-none-eabi-gcc
+OBJCOPY = arm-none-eabi-objcopy
+SIZE    = arm-none-eabi-size
+
+# Target
+TARGET  = blink
+
+# Directories
+SRC_DIR  = Src
+INC_DIR  = Inc
+BUILD_DIR = build
+
+# CPU flags
+CPU_FLAGS = -mcpu=cortex-m33 -mthumb
+
+# Compiler flags
+CFLAGS  = $(CPU_FLAGS) -Og -g3 -Wall -Wextra \
+          -ffunction-sections -fdata-sections \
+          -I$(INC_DIR)
+
+# Linker flags
+LDFLAGS = $(CPU_FLAGS) -T linker.ld -nostdlib -Wl,--gc-sections
+
+# Source files
+SRCS = $(SRC_DIR)/vector_table.c \
+       $(SRC_DIR)/rp2350_reset_handler.c \
+       $(SRC_DIR)/rp2350_stack.c \
+       $(SRC_DIR)/rp2350_xosc.c \
+       $(SRC_DIR)/rp2350_reset.c \
+       $(SRC_DIR)/rp2350_uart.c \
+       $(SRC_DIR)/rp2350_gpio.c \
+       $(SRC_DIR)/rp2350_led.c \
+       $(SRC_DIR)/rp2350_delay.c \
+       $(SRC_DIR)/main.c \
+       $(SRC_DIR)/image_def.c
+
+# Object files
+OBJS = $(patsubst $(SRC_DIR)/%.c,$(BUILD_DIR)/%.o,$(SRCS))
+
+# Rules
+.PHONY: all clean flash
+
+all: $(BUILD_DIR)/$(TARGET).bin
+	@echo "==================================="
+	@echo "SUCCESS! Created $(TARGET).elf and $(TARGET).bin"
+	@echo "==================================="
+
+$(BUILD_DIR)/%.o: $(SRC_DIR)/%.c | $(BUILD_DIR)
+	$(CC) $(CFLAGS) -c $< -o $@
+
+$(BUILD_DIR)/$(TARGET).elf: $(OBJS)
+	$(CC) $(LDFLAGS) $(OBJS) -o $@
+	$(SIZE) $@
+
+$(BUILD_DIR)/$(TARGET).bin: $(BUILD_DIR)/$(TARGET).elf
+	$(OBJCOPY) -O binary $< $@
+
+
+$(BUILD_DIR):
+	$(MKDIR)
+
+clean:
+	$(RM)
+
+flash: $(BUILD_DIR)/$(TARGET).elf
+	openocd -f interface/cmsis-dap.cfg -f target/rp2350.cfg \
+	  -c "adapter speed 5000" \
+	  -c "program $< verify reset exit"
@@ -0,0 +1,41 @@
+/**
+ * @file image_def.c
+ * @brief RP2350 IMAGE_DEF block for boot ROM image recognition.
+ * @author Kevin Thomas
+ * @date 2026
+ *
+ * Must appear within the first 4 KB of flash for the boot ROM
+ * to accept the image.
+ *
+ * MIT License
+ *
+ * Copyright (c) 2026 Kevin Thomas
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#include <stdint.h>
+
+__attribute__((section(".embedded_block"), used))
+const uint8_t picobin_block[] = {
+  0xD3, 0xDE, 0xFF, 0xFF,
+  0x42, 0x01, 0x21, 0x10,
+  0xFF, 0x01, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00,
+  0x79, 0x35, 0x12, 0xAB
+};
@@ -0,0 +1,63 @@
+/**
+ * @file main.c
+ * @brief Blink demonstration: toggle onboard LED every 500 ms.
+ * @author Kevin Thomas
+ * @date 2026
+ *
+ * Demonstrates GPIO output control using the blink driver.
+ * The onboard LED on GPIO 25 is toggled every 500 ms and the
+ * current state is reported over UART.
+ *
+ * MIT License
+ *
+ * Copyright (c) 2026 Kevin Thomas
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#include "rp2350_led.h"
+#include "rp2350_uart.h"
+#include "rp2350_delay.h"
+
+/** @brief Delay between LED state toggles in milliseconds */
+#define BLINK_DELAY_MS 500
+
+/**
+  * @brief  Print the current LED state over UART.
+  * @param  pin GPIO pin number to query
+  * @retval None
+  */
+static void print_led_state(uint32_t pin)
+{
+  if (led_get_state(pin))
+    uart_puts("LED: ON\r\n");
+  else
+    uart_puts("LED: OFF\r\n");
+}
+
+int main(void)
+{
+  led_init(LED_PIN);
+  uart_puts("LED driver initialized on GPIO 25\r\n");
+  while (1) 
+  {
+    led_toggle(LED_PIN);
+    print_led_state(LED_PIN);
+    delay_ms(BLINK_DELAY_MS);
+  }
+}
@@ -0,0 +1,48 @@
+/**
+ * @file rp2350_delay.c
+ * @brief Delay driver implementation for RP2350.
+ * @author Kevin Thomas
+ * @date 2026
+ *
+ * Busy-wait millisecond delay calibrated for a 12 MHz clock
+ * (3600 loop iterations per millisecond).
+ *
+ * MIT License
+ *
+ * Copyright (c) 2026 Kevin Thomas
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#include "rp2350_delay.h"
+
+void delay_ms(uint32_t ms)
+{
+  if (ms == 0)
+    return;
+  __asm__ volatile (
+    "mov r4, #3600\n\t"
+    "mul r5, %0, r4\n\t"
+    "1:\n\t"
+    "subs r5, #1\n\t"
+    "bne 1b\n\t"
+    :
+    : "r" (ms)
+    : "r4", "r5", "cc"
+  );
+}
@@ -0,0 +1,99 @@
+/**
+ * @file rp2350_gpio.c
+ * @brief GPIO driver implementation for RP2350.
+ * @author Kevin Thomas
+ * @date 2026
+ *
+ * SIO-based GPIO configuration using IO_BANK0 and PADS_BANK0
+ * register structs defined in rp2350.h. All register offsets
+ * verified against the RP2350 datasheet (RP-008373-DS-2).
+ *
+ * MIT License
+ *
+ * Copyright (c) 2026 Kevin Thomas
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#include "rp2350_gpio.h"
+
+/**
+  * @brief  Configure pad control for a GPIO pin.
+  * @param  gpio_num GPIO pin number (0-29)
+  * @retval None
+  */
+static void gpio_config_pad(uint32_t gpio_num)
+{
+  uint32_t value;
+  value = PADS_BANK0->GPIO[gpio_num];
+  value &= ~(1U << PADS_BANK0_OD_SHIFT);
+  value |= (1U << PADS_BANK0_IE_SHIFT);
+  value &= ~(1U << PADS_BANK0_ISO_SHIFT);
+  PADS_BANK0->GPIO[gpio_num] = value;
+}
+
+/**
+  * @brief  Set IO_BANK0 FUNCSEL to SIO for a GPIO pin.
+  * @param  gpio_num GPIO pin number (0-29)
+  * @retval None
+  */
+static void gpio_config_funcsel(uint32_t gpio_num)
+{
+  uint32_t value;
+  value = IO_BANK0->GPIO[gpio_num].CTRL;
+  value &= ~IO_BANK0_CTRL_FUNCSEL_MASK;
+  value |= IO_BANK0_CTRL_FUNCSEL_SIO;
+  IO_BANK0->GPIO[gpio_num].CTRL = value;
+}
+
+/**
+  * @brief  Enable the output driver for a GPIO pin via SIO.
+  * @param  gpio_num GPIO pin number (0-29)
+  * @retval None
+  */
+static void gpio_enable_output(uint32_t gpio_num)
+{
+  SIO[SIO_GPIO_OE_SET_OFFSET] = (1U << gpio_num);
+}
+
+void gpio_config(uint32_t gpio_num)
+{
+  gpio_config_pad(gpio_num);
+  gpio_config_funcsel(gpio_num);
+  gpio_enable_output(gpio_num);
+}
+
+void gpio_set(uint32_t gpio_num)
+{
+  SIO[SIO_GPIO_OUT_SET_OFFSET] = (1U << gpio_num);
+}
+
+void gpio_clear(uint32_t gpio_num)
+{
+  SIO[SIO_GPIO_OUT_CLR_OFFSET] = (1U << gpio_num);
+}
+
+void gpio_toggle(uint32_t gpio_num)
+{
+  SIO[SIO_GPIO_OUT_XOR_OFFSET] = (1U << gpio_num);
+}
+
+bool gpio_get(uint32_t gpio_num)
+{
+  return (SIO[SIO_GPIO_IN_OFFSET] & (1U << gpio_num)) != 0;
+}
@@ -0,0 +1,58 @@
+/**
+ * @file rp2350_led.c
+ * @brief LED driver implementation for RP2350.
+ * @author Kevin Thomas
+ * @date 2026
+ *
+ * High-level wrapper around the GPIO driver for LED control.
+ *
+ * MIT License
+ *
+ * Copyright (c) 2026 Kevin Thomas
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#include "rp2350_led.h"
+#include "rp2350_gpio.h"
+
+void led_init(uint32_t pin)
+{
+  gpio_config(pin);
+  gpio_clear(pin);
+}
+
+void led_on(uint32_t pin)
+{
+  gpio_set(pin);
+}
+
+void led_off(uint32_t pin)
+{
+  gpio_clear(pin);
+}
+
+void led_toggle(uint32_t pin)
+{
+  gpio_toggle(pin);
+}
+
+bool led_get_state(uint32_t pin)
+{
+  return gpio_get(pin);
+}
@@ -0,0 +1,41 @@
+/**
+ * @file rp2350_reset.c
+ * @brief Reset controller driver implementation for RP2350.
+ * @author Kevin Thomas
+ * @date 2026
+ *
+ * Releases IO_BANK0 from reset and waits until the subsystem
+ * is ready.
+ *
+ * MIT License
+ *
+ * Copyright (c) 2026 Kevin Thomas
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#include "rp2350_reset.h"
+
+void reset_init_subsystem(void)
+{
+  uint32_t value;
+  value = RESETS->RESET;
+  value &= ~(1U << RESETS_RESET_IO_BANK0_SHIFT);
+  RESETS->RESET = value;
+  while ((RESETS->RESET_DONE & (1U << RESETS_RESET_IO_BANK0_SHIFT)) == 0) {}
+}
@@ -0,0 +1,80 @@
+/**
+ * @file rp2350_reset_handler.c
+ * @brief Reset handler implementation for RP2350.
+ * @author Kevin Thomas
+ * @date 2026
+ *
+ * Entry point after power-on or system reset. Initializes the
+ * stack, XOSC, subsystem resets, UART, then branches
+ * to main().
+ *
+ * MIT License
+ *
+ * Copyright (c) 2026 Kevin Thomas
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#include "rp2350_reset_handler.h"
+#include "rp2350_stack.h"
+#include "rp2350_xosc.h"
+#include "rp2350_reset.h"
+#include "rp2350_uart.h"
+
+extern int main(void);
+
+extern uint32_t __data_lma;
+extern uint32_t __data_start;
+extern uint32_t __data_end;
+extern uint32_t __bss_start;
+extern uint32_t __bss_end;
+
+static void _data_copy_init(void)
+{
+  uint32_t *src = &__data_lma;
+  uint32_t *dst = &__data_start;
+  while (dst < &__data_end)
+    *dst++ = *src++;
+}
+
+static void _bss_zero_init(void)
+{
+  uint32_t *dst = &__bss_start;
+  while (dst < &__bss_end)
+    *dst++ = 0U;
+}
+
+void _ram_init(void)
+{
+  stack_init();
+  _data_copy_init();
+  _bss_zero_init();
+}
+
+void __attribute__((naked, noreturn)) Reset_Handler(void)
+{
+  __asm__ volatile (
+    "bl _ram_init\n\t"
+    "bl xosc_init\n\t"
+    "bl xosc_enable_peri_clk\n\t"
+    "bl reset_init_subsystem\n\t"
+    "bl uart_release_reset\n\t"
+    "bl uart_init\n\t"
+    "b main\n\t"
+  );
+}
@@ -0,0 +1,47 @@
+/**
+ * @file rp2350_stack.c
+ * @brief Stack pointer initialization for RP2350.
+ * @author Kevin Thomas
+ * @date 2026
+ *
+ * Sets MSP, PSP, MSPLIM, and PSPLIM using inline assembly.
+ *
+ * MIT License
+ *
+ * Copyright (c) 2026 Kevin Thomas
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#include "rp2350_stack.h"
+
+void stack_init(void)
+{
+  __asm__ volatile (
+    "ldr   r0, =%0\n\t"
+    "msr   PSP, r0\n\t"
+    "ldr   r0, =%1\n\t"
+    "msr   MSPLIM, r0\n\t"
+    "msr   PSPLIM, r0\n\t"
+    "ldr   r0, =%0\n\t"
+    "msr   MSP, r0\n\t"
+    :
+    : "i" (STACK_TOP), "i" (STACK_LIMIT)
+    : "r0"
+  );
+}
@@ -0,0 +1,134 @@
+/**
+ * @file rp2350_uart.c
+ * @brief UART0 driver implementation for RP2350.
+ * @author Kevin Thomas
+ * @date 2026
+ *
+ * Configures UART0 on GPIO 0 (TX) and GPIO 1 (RX) at 115200
+ * baud using the 12 MHz XOSC clock.
+ *
+ * MIT License
+ *
+ * Copyright (c) 2026 Kevin Thomas
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#include "rp2350_uart.h"
+
+/** @brief Base address pointer for UART0 peripheral registers */
+#define UART_BASE ((volatile uint32_t *) UART0_BASE)
+
+/**
+  * @brief  Clear the UART0 reset bit in the reset controller.
+  * @retval None
+  */
+static void uart_clear_reset_bit(void)
+{
+  uint32_t value;
+  value = RESETS->RESET;
+  value &= ~(1U << RESETS_RESET_UART0_SHIFT);
+  RESETS->RESET = value;
+}
+
+/**
+  * @brief  Wait until the UART0 block is out of reset.
+  * @retval None
+  */
+static void uart_wait_reset_done(void)
+{
+  while ((RESETS->RESET_DONE & (1U << RESETS_RESET_UART0_SHIFT)) == 0) {}
+}
+
+/**
+  * @brief  Configure GPIO pins 0 (TX) and 1 (RX) for UART function.
+  * @retval None
+  */
+static void uart_configure_pins(void)
+{
+  IO_BANK0->GPIO[0].CTRL = IO_BANK0_CTRL_FUNCSEL_UART;
+  IO_BANK0->GPIO[1].CTRL = IO_BANK0_CTRL_FUNCSEL_UART;
+  PADS_BANK0->GPIO[0] = 0x04;
+  PADS_BANK0->GPIO[1] = 0x40;
+}
+
+/**
+  * @brief  Set UART0 baud rate divisors for 115200 at 12 MHz.
+  * @retval None
+  */
+static void uart_set_baud(void)
+{
+  UART_BASE[UART_CR_OFFSET] = 0;
+  UART_BASE[UART_IBRD_OFFSET] = 6;
+  UART_BASE[UART_FBRD_OFFSET] = 33;
+}
+
+/**
+  * @brief  Configure line control and enable UART0.
+  * @retval None
+  */
+static void uart_enable(void)
+{
+  UART_BASE[UART_LCR_H_OFFSET] = UART_LCR_H_8N1_FIFO;
+  UART_BASE[UART_CR_OFFSET] = UART_CR_ENABLE;
+}
+
+void uart_release_reset(void)
+{
+  uart_clear_reset_bit();
+  uart_wait_reset_done();
+}
+
+void uart_init(void)
+{
+  uart_configure_pins();
+  uart_set_baud();
+  uart_enable();
+}
+
+bool uart_is_readable(void)
+{
+  return (UART_BASE[UART_FR_OFFSET] & UART_FR_RXFE_MASK) == 0;
+}
+
+char uart_getchar(void)
+{
+  while (UART_BASE[UART_FR_OFFSET] & UART_FR_RXFE_MASK) {}
+  return (char)(UART_BASE[UART_DR_OFFSET] & 0xFF);
+}
+
+void uart_putchar(char c)
+{
+  while (UART_BASE[UART_FR_OFFSET] & UART_FR_TXFF_MASK) {}
+  UART_BASE[UART_DR_OFFSET] = (uint32_t)c;
+}
+
+void uart_puts(const char *str)
+{
+  while (*str) 
+  {
+    uart_putchar(*str++);
+  }
+}
+
+char uart_to_upper(char c)
+{
+  if (c >= 'a' && c <= 'z')
+    return (char)(c - 32);
+  return c;
+}
@@ -0,0 +1,48 @@
+/**
+ * @file rp2350_xosc.c
+ * @brief XOSC driver implementation for RP2350.
+ * @author Kevin Thomas
+ * @date 2026
+ *
+ * Configures the external crystal oscillator and enables the
+ * peripheral clock sourced from XOSC.
+ *
+ * MIT License
+ *
+ * Copyright (c) 2026 Kevin Thomas
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#include "rp2350_xosc.h"
+
+void xosc_init(void)
+{
+  XOSC->STARTUP = 0x00C4U;
+  XOSC->CTRL = 0x00FABAA0U;
+  while ((XOSC->STATUS & (1U << XOSC_STATUS_STABLE_SHIFT)) == 0) {}
+}
+
+void xosc_enable_peri_clk(void)
+{
+  uint32_t value;
+  value = CLOCKS->CLK_PERI_CTRL;
+  value |= (1U << CLK_PERI_CTRL_ENABLE_SHIFT);
+  value |= (CLK_PERI_CTRL_AUXSRC_XOSC << CLK_PERI_CTRL_AUXSRC_SHIFT);
+  CLOCKS->CLK_PERI_CTRL = value;
+}
@@ -0,0 +1,44 @@
+/**
+ * @file vector_table.c
+ * @brief Vector table with initial stack pointer and reset handler.
+ * @author Kevin Thomas
+ * @date 2026
+ *
+ * Placed in the .vectors section at the start of flash.
+ * The Thumb bit (bit 0 = 1) is automatically set by the
+ * linker for function pointers in Thumb mode.
+ *
+ * MIT License
+ *
+ * Copyright (c) 2026 Kevin Thomas
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#include <stdint.h>
+
+extern uint32_t _stack_top;
+extern void Reset_Handler(void);
+
+typedef void (*vector_func_t)(void);
+
+__attribute__((section(".vectors"), used))
+const void *_vectors[2] = {
+  &_stack_top,
+  Reset_Handler
+};
@@ -0,0 +1,144 @@
+/**
+  ******************************************************************************
+  * @file    linker.ld
+  * @author  Kevin Thomas
+  * @brief   Minimal linker script for bare-metal RP2350 development.
+  *
+  *          Defines FLASH (XIP 32 MB) and RAM (520 kB SRAM) regions.
+  *          The vector table is placed at the start of flash (0x10000000).
+  *
+  ******************************************************************************
+  * @attention
+  *
+  * Copyright (c) 2026 Kevin Thomas.
+  * All rights reserved.
+  *
+  * This software is licensed under terms that can be found in the LICENSE file
+  * in the root directory of this software component.
+  * If no LICENSE file comes with this software, it is provided AS-IS.
+  *
+  ******************************************************************************
+  */
+
+/**
+  * Entry point.
+  */
+ENTRY(Reset_Handler)
+
+/**
+  * Define memory regions.
+  */
+__XIP_BASE   = 0x10000000;
+__XIP_SIZE   = 32M;
+
+__SRAM_BASE  = 0x20000000;
+__SRAM_SIZE  = 520K;
+__STACK_SIZE = 32K;
+
+/**
+  * Memory layout.
+  */
+MEMORY
+{
+  RAM   (rwx) : ORIGIN = __SRAM_BASE, LENGTH = __SRAM_SIZE
+  FLASH (rx)  : ORIGIN = __XIP_BASE,  LENGTH = __XIP_SIZE
+}
+
+/**
+  * Program headers.
+  */
+PHDRS
+{
+  text PT_LOAD FLAGS(5);
+  data PT_LOAD FLAGS(6);
+}
+
+/**
+  * Section placement.
+  */
+SECTIONS
+{
+  . = ORIGIN(FLASH);
+
+  /**
+    * Vector table MUST be first at 0x10000000.
+    */
+  .vectors :
+  {
+    KEEP(*(.vectors))
+  } > FLASH :text
+
+  /**
+    * Verify vector table placement.
+    */
+  ASSERT((ADDR(.vectors) == ORIGIN(FLASH)),
+         "Vector table must be at start of flash (0x10000000)")
+
+  /**
+    * Text and read-only data.
+    */
+  .text :
+  {
+    . = ALIGN(4);
+    *(.text*)
+    *(.rodata*)
+    KEEP(*(.init))
+    KEEP(*(.fini))
+    KEEP(*(.ARM.attributes))
+  } > FLASH :text
+
+  /**
+    * IMAGE_DEF block at end of code.
+    */
+  .embedded_block :
+  {
+    KEEP(*(.embedded_block))
+  } > FLASH :text
+
+  /**
+    * Initialized data and RAM-resident code (LMA in flash, VMA in RAM).
+    * Startup copies from __data_lma to __data_start..__data_end.
+    */
+  .data :
+  {
+    . = ALIGN(4);
+    __data_start = .;
+    *(.ram_func*)
+    *(.data*)
+    . = ALIGN(4);
+    __data_end = .;
+  } > RAM AT> FLASH :data
+
+    __data_lma = LOADADDR(.data);
+
+  /**
+    * Uninitialized data (BSS) in RAM.
+    */
+  .bss (NOLOAD) :
+  {
+    . = ALIGN(4);
+    __bss_start = .;
+    *(.bss*)
+    *(COMMON)
+    . = ALIGN(4);
+    __bss_end = .;
+  } > RAM
+
+  /**
+    * Non-secure stack symbols.
+    */
+  __StackTop   = ORIGIN(RAM) + LENGTH(RAM);
+  __StackLimit = __StackTop - __STACK_SIZE;
+  __stack      = __StackTop;
+  _stack_top   = __StackTop;
+
+  /**
+    * Stack section (no load).
+    */
+  .stack (NOLOAD) : { . = ALIGN(8); } > RAM
+
+  /**
+    * Provide vector table symbol to startup code.
+    */
+  PROVIDE(__Vectors = ADDR(.vectors));
+}
@@ -0,0 +1,102 @@
+# SPDX-License-Identifier: MIT OR Apache-2.0
+#
+# Copyright (c) 2021–2024 The rp-rs Developers
+# Copyright (c) 2021 rp-rs organization
+# Copyright (c) 2025 Raspberry Pi Ltd.
+#
+# Cargo Configuration for the https://github.com/rp-rs/rp-hal.git repository.
+#
+# You might want to make a similar file in your own repository if you are
+# writing programs for Raspberry Silicon microcontrollers.
+#
+
+[build]
+target = "thumbv8m.main-none-eabihf"
+# Set the default target to match the Cortex-M33 in the RP2350
+# target = "thumbv8m.main-none-eabihf"
+# target = "thumbv6m-none-eabi"
+# target = "riscv32imac-unknown-none-elf"
+
+# Target specific options
+[target.thumbv6m-none-eabi]
+# Pass some extra options to rustc, some of which get passed on to the linker.
+#
+# * linker argument --nmagic turns off page alignment of sections (which saves
+#   flash space)
+# * linker argument -Tlink.x tells the linker to use link.x as the linker
+#   script. This is usually provided by the cortex-m-rt crate, and by default
+#   the version in that crate will include a file called `memory.x` which
+#   describes the particular memory layout for your specific chip. 
+# * no-vectorize-loops turns off the loop vectorizer (seeing as the M0+ doesn't
+#   have SIMD)
+linker = "flip-link"
+rustflags = [
+    "-C", "link-arg=--nmagic",
+    "-C", "link-arg=-Tlink.x",
+    "-C", "link-arg=-Tdefmt.x",
+    "-C", "no-vectorize-loops",
+]
+
+# Use picotool for loading.
+#
+# Load an elf, skipping unchanged flash sectors, verify it, and execute it
+runner = "${PICOTOOL_PATH} load -u -v -x -t elf"
+#runner = "probe-rs run --chip ${CHIP} --protocol swd"
+
+# This is the hard-float ABI for Arm mode.
+#
+# The FPU is enabled by default, and float function arguments use FPU
+# registers.
+[target.thumbv8m.main-none-eabihf]
+# Pass some extra options to rustc, some of which get passed on to the linker.
+#
+# * linker argument --nmagic turns off page alignment of sections (which saves
+#   flash space)
+# * linker argument -Tlink.x tells the linker to use link.x as a linker script.
+#   This is usually provided by the cortex-m-rt crate, and by default the
+#   version in that crate will include a file called `memory.x` which describes
+#   the particular memory layout for your specific chip. 
+# * linker argument -Tdefmt.x also tells the linker to use `defmt.x` as a
+#   secondary linker script. This is required to make defmt_rtt work.
+rustflags = [
+    "-C", "link-arg=--nmagic",
+    "-C", "link-arg=-Tlink.x",
+    "-C", "link-arg=-Tdefmt.x",
+    "-C", "target-cpu=cortex-m33",
+]
+
+# Use picotool for loading.
+#
+# Load an elf, skipping unchanged flash sectors, verify it, and execute it
+runner = "${PICOTOOL_PATH} load -u -v -x -t elf"
+#runner = "probe-rs run --chip ${CHIP} --protocol swd"
+
+# This is the soft-float ABI for RISC-V mode.
+#
+# Hazard 3 does not have an FPU and so float function arguments use integer
+# registers.
+[target.riscv32imac-unknown-none-elf]
+# Pass some extra options to rustc, some of which get passed on to the linker.
+#
+# * linker argument --nmagic turns off page alignment of sections (which saves
+#   flash space)
+# * linker argument -Trp235x_riscv.x also tells the linker to use
+#   `rp235x_riscv.x` as a linker script. This adds in RP2350 RISC-V specific
+#   things that the riscv-rt crate's `link.x` requires and then includes
+#   `link.x` automatically. This is the reverse of how we do it on Cortex-M.
+# * linker argument -Tdefmt.x also tells the linker to use `defmt.x` as a
+#   secondary linker script. This is required to make defmt_rtt work.
+rustflags = [
+    "-C", "link-arg=--nmagic",
+    "-C", "link-arg=-Trp2350_riscv.x",
+    "-C", "link-arg=-Tdefmt.x",
+]
+
+# Use picotool for loading.
+#
+# Load an elf, skipping unchanged flash sectors, verify it, and execute it
+runner = "${PICOTOOL_PATH} load -u -v -x -t elf"
+#runner = "probe-rs run --chip ${CHIP} --protocol swd"
+
+[env]
+DEFMT_LOG = "debug"
@@ -0,0 +1,113 @@
+# Created by https://www.toptal.com/developers/gitignore/api/rust,visualstudiocode,macos,windows,linux
+# Edit at https://www.toptal.com/developers/gitignore?templates=rust,visualstudiocode,macos,windows,linux
+
+### Linux ###
+*~
+
+# temporary files which can be created if a process still has a handle open of a deleted file
+.fuse_hidden*
+
+# KDE directory preferences
+.directory
+
+# Linux trash folder which might appear on any partition or disk
+.Trash-*
+
+# .nfs files are created when an open file is removed but is still being accessed
+.nfs*
+
+### macOS ###
+# General
+.DS_Store
+.AppleDouble
+.LSOverride
+
+# Icon must end with two 
+Icon
+
+
+# Thumbnails
+._*
+
+# Files that might appear in the root of a volume
+.DocumentRevisions-V100
+.fseventsd
+.Spotlight-V100
+.TemporaryItems
+.Trashes
+.VolumeIcon.icns
+.com.apple.timemachine.donotpresent
+
+# Directories potentially created on remote AFP share
+.AppleDB
+.AppleDesktop
+Network Trash Folder
+Temporary Items
+.apdisk
+
+### macOS Patch ###
+# iCloud generated files
+*.icloud
+
+### Rust ###
+# Generated by Cargo
+# will have compiled files and executables
+debug/
+target/
+
+# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
+# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
+Cargo.lock
+
+# These are backup files generated by rustfmt
+**/*.rs.bk
+
+# MSVC Windows builds of rustc generate these, which store debugging information
+*.pdb
+
+### VisualStudioCode ###
+.vscode/*
+!.vscode/settings.json
+!.vscode/tasks.json
+!.vscode/launch.json
+!.vscode/extensions.json
+!.vscode/*.code-snippets
+
+# Local History for Visual Studio Code
+.history/
+
+# Built Visual Studio Code Extensions
+*.vsix
+
+### VisualStudioCode Patch ###
+# Ignore all local history of files
+.history
+.ionide
+
+### Windows ###
+# Windows thumbnail cache files
+Thumbs.db
+Thumbs.db:encryptable
+ehthumbs.db
+ehthumbs_vista.db
+
+# Dump file
+*.stackdump
+
+# Folder config file
+[Dd]esktop.ini
+
+# Recycle Bin used on file shares
+$RECYCLE.BIN/
+
+# Windows Installer files
+*.cab
+*.msi
+*.msix
+*.msm
+*.msp
+
+# Windows shortcuts
+*.lnk
+
+# End of https://www.toptal.com/developers/gitignore/api/rust,visualstudiocode,macos,windows,linux
@@ -0,0 +1 @@
+rp2350
@@ -0,0 +1,8 @@
+{
+  "recommendations": [
+    "marus25.cortex-debug",
+    "rust-lang.rust-analyzer",
+    "probe-rs.probe-rs-debugger",
+    "raspberry-pi.raspberry-pi-pico"
+  ]
+}
@@ -0,0 +1,41 @@
+{
+  "version": "0.2.0",
+  "configurations": [
+    {
+      "name": "Pico Debug (probe-rs)",
+      "cwd": "${workspaceFolder}",
+      "request": "launch",
+      "type": "probe-rs-debug",
+      "connectUnderReset": false,
+      "speed": 5000,
+      "runtimeExecutable": "probe-rs",
+      "chip": "${command:raspberry-pi-pico.getChip}",
+      "runtimeArgs": [
+        "dap-server"
+      ],
+      "flashingConfig": {
+        "flashingEnabled": true,
+        "haltAfterReset": false
+      },
+      "coreConfigs": [
+        {
+          "coreIndex": 0,
+          "programBinary": "${command:raspberry-pi-pico.launchTargetPath}",
+          "rttEnabled": true,
+          "svdFile": "${command:raspberry-pi-pico.getSVDPath}",
+          "rttChannelFormats": [
+            {
+              "channelNumber": 0,
+              "dataFormat": "Defmt",
+              "mode": "NoBlockSkip",
+              "showTimestamps": true
+            }
+          ]
+        }
+      ],
+      "preLaunchTask": "Build + Generate SBOM (debug)",
+      "consoleLogLevel": "Debug",
+      "wireProtocol": "Swd"
+    }
+  ]
+}
--- a/Show More
+++ b/Show More