Add new driver implementations and workspace updates

drivers/0x01_uart_asm_arm/main.s

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+/**
+ * FILE: main.s
+ *
+ * DESCRIPTION:
+ * RP2350 Bare-Metal UART Main Application.
+ * 
+ * BRIEF:
+ * Main application entry point for RP2350 UART driver. Contains the
+ * main loop that echoes UART input to output.
+ *
+ * AUTHOR: Kevin Thomas
+ * CREATION DATE: November 2, 2025
+ * UPDATE DATE: November 27, 2025
+ */
+
+.syntax unified                                  // use unified assembly syntax
+.cpu cortex-m33                                  // target Cortex-M33 core
+.thumb                                           // use Thumb instruction set
+
+.include "constants.s"
+
+/**
+ * Initialize the .text section. 
+ * The .text section contains executable code.
+ */
+.section .text                                   // code section
+.align 2                                         // align to 4-byte boundary
+
+/**
+ * @brief   Main application entry point.
+ *
+ * @details Implements the infinite echo loop.
+ *
+ * @param   None
+ * @retval  None
+ */
+.global main                                     // export main
+.type main, %function                            // mark as function
+main:
+.Push_Registers:
+  push  {r4-r12, lr}                             // push registers r4-r12, lr to the stack
+.Loop:
+  bl    UART0_In                                 // call UART0_In
+  bl    UART0_Out                                // call UART0_Out
+  b     .Loop                                    // loop forever
+.Pop_Registers:
+  pop   {r4-r12, lr}                             // pop registers r4-r12, lr from the stack
+  bx    lr                                       // return to caller
+
+/**
+ * Test data and constants.
+ * The .rodata section is used for constants and static data.
+ */
+.section .rodata                                 // read-only data section
+
+/**
+ * Initialized global data.
+ * The .data section is used for initialized global or static variables.
+ */
+.section .data                                   // data section
+
+/**
+ * Uninitialized global data.
+ * The .bss section is used for uninitialized global or static variables.
+ */
+.section .bss                                    // BSS section