PMU — 深度睡眠 RTC 唤醒

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

void led_config(void);
void nvic_configuration(void);
void rtc_configuration(void);
void fwdgt_configuration(void);

/* software delay to prevent the impact of Vcore fluctuations.
   It is strongly recommended to include it to avoid issues caused by self-removal. */
static void _soft_delay_(uint32_t time)
{
    __IO uint32_t i;
    for(i=0; i<time*10; i++){
    }
}

int main(void)
{
    /* nvic configuration */
    nvic_configuration();
    /* LED configuration */
    led_config();
    /* systick configuration */
    systick_config();
    gd_eval_led_on(LED5);
    delay_1ms(2000U);
    gd_eval_led_off(LED5);
    /* RTC configuration */
    rtc_configuration();
    /* FWDGT configuration */
    fwdgt_configuration();

    while(1){
        delay_1ms(50U);
        /* The following is to prevent Vcore fluctuations caused by frequency switching. 
           It is strongly recommended to include it to avoid issues caused by self-removal. */
        _soft_delay_(0x50);
        rcu_ahb_clock_config(RCU_AHB_CKSYS_DIV2);
        _soft_delay_(0x50);
        rcu_ahb_clock_config(RCU_AHB_CKSYS_DIV4);
        _soft_delay_(0x50);
        rcu_ahb_clock_config(RCU_AHB_CKSYS_DIV8);
        _soft_delay_(0x50);
        rcu_ahb_clock_config(RCU_AHB_CKSYS_DIV16);
        _soft_delay_(0x50);
        rcu_system_clock_source_config(RCU_CKSYSSRC_IRC8M);
        _soft_delay_(200);
        rcu_ahb_clock_config(RCU_AHB_CKSYS_DIV1);

        /* PMU enters deepsleep mode */
        pmu_to_deepsleepmode(PMU_LDO_LOWPOWER, PMU_LOWDRIVER_DISABLE, WFI_CMD);
        gd_eval_led_toggle(LED2);
    }
}

void led_config(void)
{
    gd_eval_led_init(LED2);
    gd_eval_led_init(LED5);
}