Add 0x0d_timer_cbm: bare-metal TIMER0 repeating alarm driver for RP2350

2026-07-17 09:27:30 +02:00 · 2026-04-05 20:28:23 -04:00
parent 998518dcda
commit 424f604935
24 changed files with 1950 additions and 0 deletions
@@ -0,0 +1,70 @@
+/**
+  ******************************************************************************
+  * @file    vector_table.c
+  * @author  Kevin Thomas
+  * @brief   Vector table with initial stack pointer, reset handler, and
+  *          TIMER0 alarm 0 IRQ handler.
+  *
+  *          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.
+  *
+  ******************************************************************************
+  * @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.
+  *
+  ******************************************************************************
+  */
+
+#include <stdint.h>
+
+extern uint32_t _stack_top;
+extern void Reset_Handler(void);
+extern void TIMER0_IRQ_0_Handler(void);
+
+/**
+  * @brief  Default handler for unused exceptions (infinite loop).
+  * @retval None
+  */
+static void _default_handler(void)
+{
+  while (1) {
+  }
+}
+
+typedef void (*vector_func_t)(void);
+
+/**
+  * @brief Vector table placed in .vectors section
+  *
+  *        Entry 0:     Initial SP
+  *        Entry 1:     Reset handler
+  *        Entries 2-15: System exceptions (NMI, HardFault, etc.)
+  *        Entry 16:    IRQ 0 = TIMER0_IRQ_0
+  */
+__attribute__((section(".vectors"), used))
+const void *_vectors[17] = {
+  &_stack_top,                 // 0:  Initial stack pointer
+  Reset_Handler,               // 1:  Reset
+  _default_handler,            // 2:  NMI
+  _default_handler,            // 3:  HardFault
+  _default_handler,            // 4:  MemManage
+  _default_handler,            // 5:  BusFault
+  _default_handler,            // 6:  UsageFault
+  _default_handler,            // 7:  SecureFault
+  0,                           // 8:  Reserved
+  0,                           // 9:  Reserved
+  0,                           // 10: Reserved
+  _default_handler,            // 11: SVCall
+  _default_handler,            // 12: DebugMon
+  0,                           // 13: Reserved
+  _default_handler,            // 14: PendSV
+  _default_handler,            // 15: SysTick
+  TIMER0_IRQ_0_Handler,        // 16: IRQ 0 — TIMER0_IRQ_0
+};