diff --git a/README.md b/README.md
index d475383..0bf8cc6 100644
--- a/README.md
+++ b/README.md
@@ -530,6 +530,7 @@ cargo test --lib --target x86_64-pc-windows-msvc
 | [0x05_servo_rust](drivers/0x05_servo_rust) | SG90 servo motor control | `rp235x-hal`, `embedded-hal` |
 | [0x06_adc_rust](drivers/0x06_adc_rust) | 12-bit ADC voltage + temperature | `rp235x-hal`, `embedded-hal` |
 | [0x07_i2c_rust](drivers/0x07_i2c_rust) | I2C bus scanner (7-bit addresses) | `rp235x-hal`, `embedded-hal` |
+| [0x08_lcd1602_rust](drivers/0x08_lcd1602_rust) | HD44780 16x2 LCD (PCF8574 I2C) | `rp235x-hal`, `embedded-hal` |
 
 <br>
 
diff --git a/drivers/0x08_lcd1602_rust/.cargo/config.toml b/drivers/0x08_lcd1602_rust/.cargo/config.toml
new file mode 100644
index 0000000..1791d74
--- /dev/null
+++ b/drivers/0x08_lcd1602_rust/.cargo/config.toml
@@ -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"
diff --git a/drivers/0x08_lcd1602_rust/.gitignore b/drivers/0x08_lcd1602_rust/.gitignore
new file mode 100644
index 0000000..03381c1
--- /dev/null
+++ b/drivers/0x08_lcd1602_rust/.gitignore
@@ -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
diff --git a/drivers/0x08_lcd1602_rust/.pico-rs b/drivers/0x08_lcd1602_rust/.pico-rs
new file mode 100644
index 0000000..1b6702a
--- /dev/null
+++ b/drivers/0x08_lcd1602_rust/.pico-rs
@@ -0,0 +1 @@
+rp2350
\ No newline at end of file
diff --git a/drivers/0x08_lcd1602_rust/.vscode/extensions.json b/drivers/0x08_lcd1602_rust/.vscode/extensions.json
new file mode 100644
index 0000000..5f2fd0c
--- /dev/null
+++ b/drivers/0x08_lcd1602_rust/.vscode/extensions.json
@@ -0,0 +1,8 @@
+{
+  "recommendations": [
+    "marus25.cortex-debug",
+    "rust-lang.rust-analyzer",
+    "probe-rs.probe-rs-debugger",
+    "raspberry-pi.raspberry-pi-pico"
+  ]
+}
\ No newline at end of file
diff --git a/drivers/0x08_lcd1602_rust/.vscode/launch.json b/drivers/0x08_lcd1602_rust/.vscode/launch.json
new file mode 100644
index 0000000..0bc38c3
--- /dev/null
+++ b/drivers/0x08_lcd1602_rust/.vscode/launch.json
@@ -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"
+    }
+  ]
+}
\ No newline at end of file
diff --git a/drivers/0x08_lcd1602_rust/.vscode/settings.json b/drivers/0x08_lcd1602_rust/.vscode/settings.json
new file mode 100644
index 0000000..b03cd57
--- /dev/null
+++ b/drivers/0x08_lcd1602_rust/.vscode/settings.json
@@ -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
+  }
+}
\ No newline at end of file
diff --git a/drivers/0x08_lcd1602_rust/.vscode/tasks.json b/drivers/0x08_lcd1602_rust/.vscode/tasks.json
new file mode 100644
index 0000000..4194af4
--- /dev/null
+++ b/drivers/0x08_lcd1602_rust/.vscode/tasks.json
@@ -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": []
+    }
+  ]
+}
\ No newline at end of file
diff --git a/drivers/0x08_lcd1602_rust/Cargo.toml b/drivers/0x08_lcd1602_rust/Cargo.toml
new file mode 100644
index 0000000..fc2f7c4
--- /dev/null
+++ b/drivers/0x08_lcd1602_rust/Cargo.toml
@@ -0,0 +1,40 @@
+[package]
+edition = "2024"
+name = "lcd1602"
+version = "0.1.0"
+license = "MIT or Apache-2.0"
+
+[lib]
+name = "lcd1602_lib"
+path = "src/lib.rs"
+
+[[bin]]
+name = "lcd1602"
+path = "src/main.rs"
+
+[build-dependencies]
+regex = "1.11.0"
+
+[dependencies]
+cortex-m = "0.7"
+cortex-m-rt = "0.7"
+embedded-hal = "1.0.0"
+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"] }
diff --git a/drivers/0x08_lcd1602_rust/LICENSE-APACHE b/drivers/0x08_lcd1602_rust/LICENSE-APACHE
new file mode 100644
index 0000000..8d99cbc
--- /dev/null
+++ b/drivers/0x08_lcd1602_rust/LICENSE-APACHE
@@ -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.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
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+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
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+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
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+      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.
\ No newline at end of file
diff --git a/drivers/0x08_lcd1602_rust/LICENSE-MIT b/drivers/0x08_lcd1602_rust/LICENSE-MIT
new file mode 100644
index 0000000..5369c70
--- /dev/null
+++ b/drivers/0x08_lcd1602_rust/LICENSE-MIT
@@ -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.
+  
\ No newline at end of file
diff --git a/drivers/0x08_lcd1602_rust/build.rs b/drivers/0x08_lcd1602_rust/build.rs
new file mode 100644
index 0000000..e6de3f1
--- /dev/null
+++ b/drivers/0x08_lcd1602_rust/build.rs
@@ -0,0 +1,68 @@
+//! 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.
+//!
+//! Set up linker scripts
+
+use std::fs::{ File, read_to_string };
+use std::io::Write;
+use std::path::PathBuf;
+
+use regex::Regex;
+
+fn main() {
+    println!("cargo::rustc-check-cfg=cfg(rp2040)");
+    println!("cargo::rustc-check-cfg=cfg(rp2350)");
+
+    // Put the linker script somewhere the linker can find it
+    let out = PathBuf::from(std::env::var_os("OUT_DIR").unwrap());
+    println!("cargo:rustc-link-search={}", out.display());
+
+    println!("cargo:rerun-if-changed=.pico-rs");
+    let contents = read_to_string(".pico-rs")
+        .map(|s| s.trim().to_string().to_lowercase())
+        .unwrap_or_else(|e| {
+            eprintln!("Failed to read file: {}", e);
+            String::new()
+        });
+
+    // The file `memory.x` is loaded by cortex-m-rt's `link.x` script, which
+    // is what we specify in `.cargo/config.toml` for Arm builds
+    let target;
+    if contents == "rp2040" {
+        target = "thumbv6m-none-eabi";
+        let memory_x = include_bytes!("rp2040.x");
+        let mut f = File::create(out.join("memory.x")).unwrap();
+        f.write_all(memory_x).unwrap();
+        println!("cargo::rustc-cfg=rp2040");
+        println!("cargo:rerun-if-changed=rp2040.x");
+    } else {
+        if contents.contains("riscv") {
+            target = "riscv32imac-unknown-none-elf";
+        } else {
+            target = "thumbv8m.main-none-eabihf";
+        }
+        let memory_x = include_bytes!("rp2350.x");
+        let mut f = File::create(out.join("memory.x")).unwrap();
+        f.write_all(memory_x).unwrap();
+        println!("cargo::rustc-cfg=rp2350");
+        println!("cargo:rerun-if-changed=rp2350.x");
+    }
+
+    let re = Regex::new(r"target = .*").unwrap();
+    let config_toml = include_str!(".cargo/config.toml");
+    let result = re.replace(config_toml, format!("target = \"{}\"", target));
+    let mut f = File::create(".cargo/config.toml").unwrap();
+    f.write_all(result.as_bytes()).unwrap();
+
+    // The file `rp2350_riscv.x` is what we specify in `.cargo/config.toml` for
+    // RISC-V builds
+    let rp2350_riscv_x = include_bytes!("rp2350_riscv.x");
+    let mut f = File::create(out.join("rp2350_riscv.x")).unwrap();
+    f.write_all(rp2350_riscv_x).unwrap();
+    println!("cargo:rerun-if-changed=rp2350_riscv.x");
+
+    println!("cargo:rerun-if-changed=build.rs");
+}
diff --git a/drivers/0x08_lcd1602_rust/rp2040.x b/drivers/0x08_lcd1602_rust/rp2040.x
new file mode 100644
index 0000000..0cc665b
--- /dev/null
+++ b/drivers/0x08_lcd1602_rust/rp2040.x
@@ -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;
diff --git a/drivers/0x08_lcd1602_rust/rp2350.x b/drivers/0x08_lcd1602_rust/rp2350.x
new file mode 100644
index 0000000..bda94d8
--- /dev/null
+++ b/drivers/0x08_lcd1602_rust/rp2350.x
@@ -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);
+  
\ No newline at end of file
diff --git a/drivers/0x08_lcd1602_rust/rp2350_riscv.x b/drivers/0x08_lcd1602_rust/rp2350_riscv.x
new file mode 100644
index 0000000..84388aa
--- /dev/null
+++ b/drivers/0x08_lcd1602_rust/rp2350_riscv.x
@@ -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                                    | */
diff --git a/drivers/0x08_lcd1602_rust/src/lcd1602.rs b/drivers/0x08_lcd1602_rust/src/lcd1602.rs
new file mode 100644
index 0000000..fc3d114
--- /dev/null
+++ b/drivers/0x08_lcd1602_rust/src/lcd1602.rs
@@ -0,0 +1,143 @@
+/// PCF8574 -> LCD control pin: Register Select.
+pub const PIN_RS: u8 = 0x01;
+
+/// PCF8574 -> LCD control pin: Read/Write.
+pub const PIN_RW: u8 = 0x02;
+
+/// PCF8574 -> LCD control pin: Enable.
+pub const PIN_EN: u8 = 0x04;
+
+/// Build a PCF8574 output byte for a 4-bit LCD nibble.
+pub fn build_nibble(nibble: u8, nibble_shift: u8, mode: u8, backlight_mask: u8) -> u8 {
+    let mut data = (nibble & 0x0F) << nibble_shift;
+    if mode != 0 { data |= PIN_RS; }
+    data |= backlight_mask;
+    data
+}
+
+/// Build the PCF8574 byte with EN asserted.
+pub fn nibble_with_en(nibble_byte: u8) -> u8 {
+    nibble_byte | PIN_EN
+}
+
+/// Build the PCF8574 byte with EN de-asserted.
+pub fn nibble_without_en(nibble_byte: u8) -> u8 {
+    nibble_byte & !PIN_EN
+}
+
+/// HD44780 row-offset lookup.
+const ROW_OFFSETS: [u8; 2] = [0x00, 0x40];
+
+/// Compute the DDRAM address byte for `lcd_set_cursor`.
+pub fn cursor_address(line: u8, position: u8) -> u8 {
+    let row = if line > 1 { 1 } else { line as usize };
+    0x80 | (position + ROW_OFFSETS[row])
+}
+
+/// Format a counter value as `"Count: NNNNNN"` (right-justified, 6 digits).
+pub fn format_counter(buf: &mut [u8], count: u32) -> usize {
+    let prefix = b"Count: ";
+    buf[..7].copy_from_slice(prefix);
+    let mut pos = 7;
+    let digits = [
+        ((count / 100000) % 10) as u8,
+        ((count / 10000) % 10) as u8,
+        ((count / 1000) % 10) as u8,
+        ((count / 100) % 10) as u8,
+        ((count / 10) % 10) as u8,
+        (count % 10) as u8,
+    ];
+    let mut leading = true;
+    for (i, &d) in digits.iter().enumerate() {
+        if i == 5 || d != 0 { leading = false; }
+        buf[pos] = if leading { b' ' } else { b'0' + d };
+        pos += 1;
+    }
+    pos
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn build_nibble_command_mode() {
+        let b = build_nibble(0x03, 4, 0, 0x08);
+        assert_eq!(b, 0x38);
+    }
+
+    #[test]
+    fn build_nibble_data_mode() {
+        let b = build_nibble(0x04, 4, 1, 0x08);
+        assert_eq!(b, 0x49);
+    }
+
+    #[test]
+    fn build_nibble_no_backlight() {
+        let b = build_nibble(0x0F, 4, 0, 0x00);
+        assert_eq!(b, 0xF0);
+    }
+
+    #[test]
+    fn nibble_with_en_sets_bit() {
+        assert_eq!(nibble_with_en(0x38), 0x3C);
+    }
+
+    #[test]
+    fn nibble_without_en_clears_bit() {
+        assert_eq!(nibble_without_en(0x3C), 0x38);
+    }
+
+    #[test]
+    fn cursor_address_line0_col0() {
+        assert_eq!(cursor_address(0, 0), 0x80);
+    }
+
+    #[test]
+    fn cursor_address_line1_col0() {
+        assert_eq!(cursor_address(1, 0), 0xC0);
+    }
+
+    #[test]
+    fn cursor_address_line0_col5() {
+        assert_eq!(cursor_address(0, 5), 0x85);
+    }
+
+    #[test]
+    fn cursor_address_line1_col15() {
+        assert_eq!(cursor_address(1, 15), 0xCF);
+    }
+
+    #[test]
+    fn cursor_address_clamps_line() {
+        assert_eq!(cursor_address(5, 0), 0xC0);
+    }
+
+    #[test]
+    fn format_counter_zero() {
+        let mut buf = [0u8; 16];
+        let n = format_counter(&mut buf, 0);
+        assert_eq!(&buf[..n], b"Count:      0");
+    }
+
+    #[test]
+    fn format_counter_one() {
+        let mut buf = [0u8; 16];
+        let n = format_counter(&mut buf, 1);
+        assert_eq!(&buf[..n], b"Count:      1");
+    }
+
+    #[test]
+    fn format_counter_large() {
+        let mut buf = [0u8; 16];
+        let n = format_counter(&mut buf, 123456);
+        assert_eq!(&buf[..n], b"Count: 123456");
+    }
+
+    #[test]
+    fn format_counter_six_digits() {
+        let mut buf = [0u8; 16];
+        let n = format_counter(&mut buf, 999999);
+        assert_eq!(&buf[..n], b"Count: 999999");
+    }
+}
diff --git a/drivers/0x08_lcd1602_rust/src/lib.rs b/drivers/0x08_lcd1602_rust/src/lib.rs
new file mode 100644
index 0000000..6f93728
--- /dev/null
+++ b/drivers/0x08_lcd1602_rust/src/lib.rs
@@ -0,0 +1,3 @@
+#![no_std]
+
+pub mod lcd1602;
diff --git a/drivers/0x08_lcd1602_rust/src/main.rs b/drivers/0x08_lcd1602_rust/src/main.rs
new file mode 100644
index 0000000..4b0586a
--- /dev/null
+++ b/drivers/0x08_lcd1602_rust/src/main.rs
@@ -0,0 +1,326 @@
+//! @file main.rs
+//! @brief HD44780 16x2 LCD (PCF8574 I2C backpack) demonstration
+//! @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 16x2 HD44780 LCD connected via a PCF8574 I2C backpack using
+//! the lcd1602 driver (lcd1602.rs). Line 0 shows a static title and line 1
+//! displays a live up-counter that increments every second. The counter
+//! value is also printed over UART for debugging.
+//!
+//! Wiring:
+//!   GPIO2 (SDA) -> PCF8574 backpack SDA  (4.7 kohm pull-up to 3.3 V)
+//!   GPIO3 (SCL) -> PCF8574 backpack SCL  (4.7 kohm pull-up to 3.3 V)
+//!   3.3V or 5V  -> PCF8574 backpack VCC
+//!   GND         -> PCF8574 backpack GND
+
+#![no_std]
+#![no_main]
+
+#[allow(dead_code)]
+mod lcd1602;
+
+use defmt_rtt as _;
+#[cfg(target_arch = "riscv32")]
+use panic_halt as _;
+#[cfg(target_arch = "arm")]
+use panic_probe as _;
+
+use embedded_hal::i2c::I2c;
+use fugit::RateExtU32;
+use hal::entry;
+use hal::Clock;
+use hal::gpio::{FunctionI2C, FunctionNull, FunctionUart, Pin, PullDown, PullNone, PullUp};
+use hal::uart::{DataBits, Enabled, StopBits, UartConfig, UartPeripheral};
+
+#[cfg(rp2350)]
+use rp235x_hal as hal;
+
+#[cfg(rp2040)]
+use rp2040_hal as hal;
+
+#[unsafe(link_section = ".boot2")]
+#[used]
+#[cfg(rp2040)]
+pub static BOOT2: [u8; 256] = rp2040_boot2::BOOT_LOADER_W25Q080;
+
+#[unsafe(link_section = ".start_block")]
+#[used]
+#[cfg(rp2350)]
+pub static IMAGE_DEF: hal::block::ImageDef = hal::block::ImageDef::secure_exe();
+
+const XTAL_FREQ_HZ: u32 = 12_000_000u32;
+
+const UART_BAUD: u32 = 115_200;
+const I2C_BAUD: u32 = 100_000;
+const LCD_I2C_ADDR: u8 = 0x27;
+const NIBBLE_SHIFT: u8 = 4;
+const BACKLIGHT_MASK: u8 = 0x08;
+const COUNTER_DELAY_MS: u32 = 1_000;
+
+type TxPin = Pin<hal::gpio::bank0::Gpio0, FunctionUart, PullNone>;
+type RxPin = Pin<hal::gpio::bank0::Gpio1, FunctionUart, PullNone>;
+type TxPinDefault = Pin<hal::gpio::bank0::Gpio0, FunctionNull, PullDown>;
+type RxPinDefault = Pin<hal::gpio::bank0::Gpio1, FunctionNull, PullDown>;
+type EnabledUart = UartPeripheral<Enabled, hal::pac::UART0, (TxPin, RxPin)>;
+
+/// 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.
+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.
+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 UART0 for serial output (stdio equivalent).
+///
+/// # Arguments
+///
+/// * `uart0` - PAC UART0 peripheral singleton.
+/// * `tx_pin` - GPIO pin to use as UART0 TX (GPIO 0).
+/// * `rx_pin` - GPIO pin to use as UART0 RX (GPIO 1).
+/// * `resets` - Mutable reference to the RESETS peripheral.
+/// * `clocks` - Reference to the initialised clock configuration.
+///
+/// # Returns
+///
+/// Enabled UART0 peripheral ready for blocking writes.
+///
+/// # Panics
+///
+/// Panics if the HAL cannot achieve the requested baud rate.
+fn init_uart(
+    uart0: hal::pac::UART0,
+    tx_pin: TxPinDefault,
+    rx_pin: RxPinDefault,
+    resets: &mut hal::pac::RESETS,
+    clocks: &hal::clocks::ClocksManager,
+) -> EnabledUart {
+    let pins = (
+        tx_pin.reconfigure::<FunctionUart, PullNone>(),
+        rx_pin.reconfigure::<FunctionUart, PullNone>(),
+    );
+    let cfg = UartConfig::new(UART_BAUD.Hz(), DataBits::Eight, None, StopBits::One);
+    UartPeripheral::new(uart0, pins, resets)
+        .enable(cfg, clocks.peripheral_clock.freq())
+        .unwrap()
+}
+
+/// Create a blocking delay timer from the ARM SysTick peripheral.
+///
+/// # Arguments
+///
+/// * `clocks` - Reference to the initialised clock configuration.
+///
+/// # Returns
+///
+/// Blocking delay provider.
+///
+/// # Panics
+///
+/// Panics if the cortex-m core peripherals have already been taken.
+fn init_delay(clocks: &hal::clocks::ClocksManager) -> cortex_m::delay::Delay {
+    let core = cortex_m::Peripherals::take().unwrap();
+    cortex_m::delay::Delay::new(core.SYST, clocks.system_clock.freq().to_Hz())
+}
+
+/// Write one raw byte to the PCF8574 expander over I2C.
+fn pcf_write_byte(i2c: &mut impl I2c, addr: u8, data: u8) {
+    let _ = i2c.write(addr, &[data]);
+}
+
+/// Toggle EN to latch a nibble into the LCD controller.
+fn pcf_pulse_enable(i2c: &mut impl I2c, addr: u8, data: u8, delay: &mut cortex_m::delay::Delay) {
+    pcf_write_byte(i2c, addr, lcd1602::nibble_with_en(data));
+    delay.delay_us(1);
+    pcf_write_byte(i2c, addr, lcd1602::nibble_without_en(data));
+    delay.delay_us(50);
+}
+
+/// Write one 4-bit nibble to the LCD.
+fn lcd_write4(i2c: &mut impl I2c, addr: u8, nibble: u8, mode: u8, delay: &mut cortex_m::delay::Delay) {
+    let data = lcd1602::build_nibble(nibble, NIBBLE_SHIFT, mode, BACKLIGHT_MASK);
+    pcf_pulse_enable(i2c, addr, data, delay);
+}
+
+/// Send one full 8-bit command/data value as two nibbles.
+fn lcd_send(i2c: &mut impl I2c, addr: u8, value: u8, mode: u8, delay: &mut cortex_m::delay::Delay) {
+    lcd_write4(i2c, addr, (value >> 4) & 0x0F, mode, delay);
+    lcd_write4(i2c, addr, value & 0x0F, mode, delay);
+}
+
+/// Execute the HD44780 4-bit mode power-on reset sequence.
+fn lcd_hd44780_reset(i2c: &mut impl I2c, addr: u8, delay: &mut cortex_m::delay::Delay) {
+    lcd_write4(i2c, addr, 0x03, 0, delay);
+    delay.delay_ms(5);
+    lcd_write4(i2c, addr, 0x03, 0, delay);
+    delay.delay_us(150);
+    lcd_write4(i2c, addr, 0x03, 0, delay);
+    delay.delay_us(150);
+    lcd_write4(i2c, addr, 0x02, 0, delay);
+    delay.delay_us(150);
+}
+
+/// Send post-reset configuration commands to the HD44780.
+fn lcd_hd44780_configure(i2c: &mut impl I2c, addr: u8, delay: &mut cortex_m::delay::Delay) {
+    lcd_send(i2c, addr, 0x28, 0, delay);
+    lcd_send(i2c, addr, 0x0C, 0, delay);
+    lcd_send(i2c, addr, 0x01, 0, delay);
+    delay.delay_ms(2);
+    lcd_send(i2c, addr, 0x06, 0, delay);
+}
+
+/// Set the LCD cursor position.
+fn lcd_set_cursor(i2c: &mut impl I2c, addr: u8, line: u8, position: u8, delay: &mut cortex_m::delay::Delay) {
+    lcd_send(i2c, addr, lcd1602::cursor_address(line, position), 0, delay);
+}
+
+/// Write a byte slice as character data to the LCD.
+fn lcd_puts(i2c: &mut impl I2c, addr: u8, s: &[u8], delay: &mut cortex_m::delay::Delay) {
+    for &ch in s {
+        lcd_send(i2c, addr, ch, 1, delay);
+    }
+}
+
+/// Initialize the LCD, display the title, and log over UART.
+fn setup_display(
+    i2c: &mut impl I2c,
+    uart: &EnabledUart,
+    delay: &mut cortex_m::delay::Delay,
+) {
+    lcd_hd44780_reset(i2c, LCD_I2C_ADDR, delay);
+    lcd_hd44780_configure(i2c, LCD_I2C_ADDR, delay);
+    lcd_set_cursor(i2c, LCD_I2C_ADDR, 0, 0, delay);
+    lcd_puts(i2c, LCD_I2C_ADDR, b"Reverse Eng.", delay);
+    uart.write_full_blocking(b"LCD 1602 driver initialized at I2C addr 0x27\r\n");
+}
+
+/// Format and display the next counter value on LCD line 1.
+fn update_counter(
+    i2c: &mut impl I2c,
+    uart: &EnabledUart,
+    delay: &mut cortex_m::delay::Delay,
+    count: &mut u32,
+) {
+    let mut buf = [0u8; 16];
+    let n = lcd1602::format_counter(&mut buf, *count);
+    *count += 1;
+    lcd_set_cursor(i2c, LCD_I2C_ADDR, 1, 0, delay);
+    lcd_puts(i2c, LCD_I2C_ADDR, &buf[..n], delay);
+    uart.write_full_blocking(&buf[..n]);
+    uart.write_full_blocking(b"\r\n");
+    delay.delay_ms(COUNTER_DELAY_MS);
+}
+
+/// Application entry point for the LCD 1602 counter demo.
+///
+/// Initializes the LCD over I2C with a static title on line 0 and
+/// continuously increments a counter on line 1 every second.
+///
+/// # Returns
+///
+/// Does not return.
+#[entry]
+fn main() -> ! {
+    let mut pac = hal::pac::Peripherals::take().unwrap();
+    let clocks = init_clocks(
+        pac.XOSC, pac.CLOCKS, pac.PLL_SYS, pac.PLL_USB, &mut pac.RESETS,
+        &mut hal::Watchdog::new(pac.WATCHDOG),
+    );
+    let pins = init_pins(pac.IO_BANK0, pac.PADS_BANK0, pac.SIO, &mut pac.RESETS);
+    let uart = init_uart(pac.UART0, pins.gpio0, pins.gpio1, &mut pac.RESETS, &clocks);
+    let mut delay = init_delay(&clocks);
+    let sda_pin = pins.gpio2.reconfigure::<FunctionI2C, PullUp>();
+    let scl_pin = pins.gpio3.reconfigure::<FunctionI2C, PullUp>();
+    let mut i2c = hal::I2C::i2c1(
+        pac.I2C1, sda_pin, scl_pin, I2C_BAUD.Hz(),
+        &mut pac.RESETS, clocks.system_clock.freq(),
+    );
+    setup_display(&mut i2c, &uart, &mut delay);
+    let mut count: u32 = 0;
+    loop {
+        update_counter(&mut i2c, &uart, &mut delay, &mut count);
+    }
+}
+
+#[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"LCD 1602 Counter Demo"),
+    hal::binary_info::rp_cargo_homepage_url!(),
+    hal::binary_info::rp_program_build_attribute!(),
+];
+
+// End of file