WWDGT — 窗口看门狗延迟喂狗

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

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

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

    /* turn off LED2 and LED3 */
    gd_eval_led_off(LED2);
    gd_eval_led_off(LED3);

    /* delay */
    delay_1ms(150);

    /* check if the system has resumed from WWDGT reset */
    if(RESET != rcu_flag_get(RCU_FLAG_WWDGTRST)) {
        /* WWDGTRST flag set */
        gd_eval_led_on(LED2);
        /* clear the WWDGTRST flag */
        rcu_all_reset_flag_clear();

        while(1);
    }

    /* enable WWDGT clock */
    rcu_periph_clock_enable(RCU_WWDGT);

    /*
     *  set WWDGT clock = (PCLK1 (60MHz)/4096)/8 = 1831Hz (~546 us)
     *  set counter value to 127
     *  set window value to 80
     *  refresh window is: ~546 * (127-80)= 25.6ms < refresh window < ~546 * (127-63) =34.9ms.
     */
    wwdgt_config(127, 80, WWDGT_CFG_PSC_DIV8);
    wwdgt_enable();

    while(1) {
        /* toggle LED3 */
        gd_eval_led_toggle(LED3);
        /* insert 26 ms delay */
        delay_1ms(26);
        /* update WWDGT counter */
        wwdgt_counter_update(127);
    }
}