2023-04-27 STM32: Worlds Simplest Bootloader

Bare Metal Programming Series has released a video to talk about the stm32 bootloader.

https://github.com/lowbyteproductions/bare-metal-series/tree/main/bootloader

* common-defines.h

#ifndef INC_COMMON_DEFINES_H
#define INC_COMMON_DEFINES_H

#include <stdint.h>
#include <stdbool.h>

#endif // INC_COMMON_DEFINES_H

bootloader.c

#include "common-defines.h"
#include <libopencm3/stm32/memorymap.h>

#define BOOTLOADER_SIZE        (0x8000U)
#define MAIN_APP_START_ADDRESS (FLASH_BASE + BOOTLOADER_SIZE)

static void jump_to_main(void) {
  typedef void (*void_fn)(void);

  uint32_t* reset_vector_entry = (uint32_t*)(MAIN_APP_START_ADDRESS + 4U);
  uint32_t* reset_vector = (uint32_t*)(*reset_vector_entry);
  void_fn jump_fn = (void_fn)reset_vector;

  jump_fn();
}

int main(void) {
  jump_to_main();

  // Never return
  return 0;
}

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