FWDGT — 独立看门狗喂狗

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#include "gd32f30x.h"
#include "systick.h"
#include "gd32f307c_eval.h"

int main(void)
{
    /* configure systick  */
    systick_config();

    /* configure LED  */
    gd_eval_led_init(LED2);
    gd_eval_led_init(LED3);

    /* configure the Tamper key which is used to reload FWDGT  */
    gd_eval_key_init(KEY_TAMPER, KEY_MODE_EXTI);

    delay_1ms(500);

    /* configure FWDGT counter clock: 40KHz(IRC40K) / 64 = 0.625 KHz */
    fwdgt_config(2 * 500, FWDGT_PSC_DIV64);

    /* check if the system has resumed from FWDGT reset */
    if(RESET != rcu_flag_get(RCU_FLAG_FWDGTRST)) {
        /* turn on LED3 */
        gd_eval_led_on(LED3);
        /* clear the FWDGT reset flag */
        rcu_all_reset_flag_clear();

        while(1) {
        }

    } else {
        /* turn on LED2 */
        gd_eval_led_on(LED2);
    }

    while(1) {
    }
}