PMU — 深度睡眠 EXTI 唤醒

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

void led_config(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)
{
    /* systick configuration */
    systick_config();
    /* LED configuration */
    led_config();
    /* enable clock */
    rcu_periph_clock_enable(RCU_PMU);
    /* wakeup key configuration */
    gd_eval_key_init(KEY_WAKEUP, KEY_MODE_GPIO);
    /* tamper key EXTI configuration */
    gd_eval_key_init(KEY_TAMPER, KEY_MODE_EXTI);
    /* press wakeup key to enter deepsleep mode and use tamper key to generate a exti interrupt to wakeup mcu */
    while(1){
        if(RESET == gpio_input_bit_get(WAKEUP_KEY_GPIO_PORT, WAKEUP_KEY_PIN)){
            /* 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_to_deepsleepmode(PMU_LDO_LOWPOWER, PMU_LOWDRIVER_DISABLE, WFI_CMD);
        }
    }
}

void led_config(void)
{
    gd_eval_led_init(LED2);
    gd_eval_led_init(LED3);
    gd_eval_led_init(LED4);
    gd_eval_led_init(LED5);
}