qmk_firmware

at32_dfu.c (2384B)

// Copyright 2021-2023 QMK
// Copyright 2023-2024 HorrorTroll <https://github.com/HorrorTroll>
// Copyright 2023-2024 Zhaqian <https://github.com/zhaqian12>
// SPDX-License-Identifier: GPL-2.0-or-later
#include "bootloader.h"
#include "util.h"
#include <ch.h>
#include <hal.h>
#include "wait.h"
#ifndef AT32_BOOTLOADER_RAM_SYMBOL
#    define AT32_BOOTLOADER_RAM_SYMBOL __ram0_end__
#endif
extern uint32_t AT32_BOOTLOADER_RAM_SYMBOL;
/* This code should be checked whether it runs correctly on platforms */
#define SYMVAL(sym) (uint32_t)(((uint8_t *)&(sym)) - ((uint8_t *)0))
#define BOOTLOADER_MAGIC 0xDEADBEEF
#define MAGIC_ADDR (unsigned long *)(SYMVAL(AT32_BOOTLOADER_RAM_SYMBOL) - 4)
__attribute__((weak)) void bootloader_marker_enable(void) {
    uint32_t *marker = (uint32_t *)MAGIC_ADDR;
    *marker          = BOOTLOADER_MAGIC; // set magic flag => reset handler will jump into boot loader
}
__attribute__((weak)) bool bootloader_marker_active(void) {
    const uint32_t *marker = (const uint32_t *)MAGIC_ADDR;
    return (*marker == BOOTLOADER_MAGIC) ? true : false;
}
__attribute__((weak)) void bootloader_marker_disable(void) {
    uint32_t *marker = (uint32_t *)MAGIC_ADDR;
    *marker          = 0;
}
__attribute__((weak)) void bootloader_jump(void) {
    bootloader_marker_enable();
    NVIC_SystemReset();
}
__attribute__((weak)) void mcu_reset(void) {
    NVIC_SystemReset();
}
void enter_bootloader_mode_if_requested(void) {
    if (bootloader_marker_active()) {
        bootloader_marker_disable();
        struct system_memory_vector_t {
            uint32_t stack_top;
            void (*entrypoint)(void);
        };
        const struct system_memory_vector_t *bootloader = (const struct system_memory_vector_t *)(AT32_BOOTLOADER_ADDRESS);
        __disable_irq();
#if defined(__MPU_PRESENT) && (__MPU_PRESENT == 1U)
        ARM_MPU_Disable();
#endif
        SysTick->CTRL = 0;
        SysTick->VAL  = 0;
        SysTick->LOAD = 0;
        // Clear interrupt enable and interrupt pending registers
        for (int i = 0; i < ARRAY_SIZE(NVIC->ICER); i++) {
            NVIC->ICER[i] = 0xFFFFFFFF;
            NVIC->ICPR[i] = 0xFFFFFFFF;
        }
        __set_CONTROL(0);
        __set_MSP(bootloader->stack_top);
        __enable_irq();
        // Jump to bootloader
        bootloader->entrypoint();
        while (true) {
        }
    }
}