Add new driver implementations and workspace updates

2026-07-14 16:07:28 +02:00 · 2026-03-27 11:18:29 -04:00
parent 1c02ebd76e
commit bef5e91fbf
7844 changed files with 30810 additions and 2 deletions
@@ -0,0 +1,53 @@
+/**
+ * FILE: delay.s
+ *
+ * DESCRIPTION:
+ * RP2350 Delay Functions.
+ * 
+ * BRIEF:
+ * Provides millisecond delay functions based on a 14.5MHz clock.
+ *
+ * AUTHOR: Kevin Thomas
+ * CREATION DATE: November 27, 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   Delay_MS.
+ *
+ * @details Delays for r0 milliseconds. Conversion: loop_count = ms * 3600
+ *          based on a 14.5MHz clock.
+ *
+ * @param   r0 - milliseconds
+ * @retval  None
+ */
+.global Delay_MS
+.type Delay_MS, %function
+Delay_MS:
+.Delay_MS_Push_Registers:
+  push  {r4-r12, lr}                             // push registers r4-r12, lr to the stack
+.Delay_MS_Check:
+  cmp   r0, #0                                   // if MS is not valid, return
+  ble   .Delay_MS_Done                           // branch if less or equal to 0
+.Delay_MS_Setup:
+  ldr   r4, =3600                                // loops per MS based on 14.5MHz clock
+  mul   r5, r0, r4                               // MS * 3600
+.Delay_MS_Loop:
+  subs  r5, r5, #1                               // decrement counter
+  bne   .Delay_MS_Loop                           // branch until zero
+.Delay_MS_Done:
+  pop   {r4-r12, lr}                             // pop registers r4-r12, lr from the stack
+  bx    lr                                       // return