How do you jump to the bootloader (DFU mode) in software on the STM32 F072?

Question

The STM32 App Note 2606 discusses this, but there is no simple code example.

Answer 1

In my project, I'm essentially doing the same as Brad, but without modifying the SystemInit() function.

The CubeMX HAL defines as

void __attribute__((weak)) __initialize_hardware_early(void);

which does - in my case - nothing but calling SystemInit();

So you can just overwrite this function:

#include 
#include "stm32f0xx_hal.h"

#define SYSMEM_RESET_VECTOR            0x1fffC804
#define RESET_TO_BOOTLOADER_MAGIC_CODE 0xDEADBEEF
#define BOOTLOADER_STACK_POINTER       0x20002250

uint32_t dfu_reset_to_bootloader_magic;

void __initialize_hardware_early(void)
{
    if (dfu_reset_to_bootloader_magic == RESET_TO_BOOTLOADER_MAGIC_CODE) {
        void (*bootloader)(void) = (void (*)(void)) (*((uint32_t *) SYSMEM_RESET_VECTOR));
        dfu_reset_to_bootloader_magic = 0;
        __set_MSP(BOOTLOADER_STACK_POINTER);
        bootloader();
        while (42);
    } else {
        SystemInit();
    }
}

void dfu_run_bootloader()
{
    dfu_reset_to_bootloader_magic = RESET_TO_BOOTLOADER_MAGIC_CODE;
    NVIC_SystemReset();
}