USBD — 设备固件升级 (DFU)

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#include "dfu_core.h"
#include "usbd_hw.h"
#define SRAM_BASE_ADDR      SRAM_BASE
#define SRAM_END_ADDR       (SRAM_BASE + GET_BITS(REG32(0x1FFFF7E0U), 16U, 31U) * 1024U)

int main(void)
{
    uint32_t app_addr;
    app_func application;
    uint32_t sram_sect = REG32(APP_LOADED_ADDR);

    /* configure tamper key to run firmware */
    gd_eval_key_init(KEY_TAMPER, KEY_MODE_GPIO);

    /* tamper key must be pressed on GD32-EVAL when power on */
    if(0U != gd_eval_key_state_get(KEY_TAMPER)){
        /* test if user code is programmed starting from address 0x08008000 */
        if((sram_sect >= SRAM_BASE_ADDR) && (sram_sect < SRAM_END_ADDR)){
            app_addr = *(__IO uint32_t*) (APP_LOADED_ADDR + 4U);
            application = (app_func) app_addr;

            /* initialize user application's stack pointer */
            __set_MSP(*(__IO uint32_t*) APP_LOADED_ADDR);

            /* jump to user application */
            application();
        }
    }

    /* system clocks configuration */
    rcu_config();

    /* GPIO configuration */
    gpio_config();

    /* USB device configuration */
    usbd_init(&usb_dfu, &dfu_desc, &dfu_class);

    /* NVIC configuration */
    nvic_config();

    usbd_connect(&usb_dfu);

    while(1) {
    }
}