stm32---待机唤醒

wkup.c

#include "wkup.h"

void Enter_Standby_Mode()
{
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR,ENABLE); //开启电源时钟
    PWR_WakeUpPinCmd(ENABLE);  //设置waup引脚是唤醒引脚(此机是k_UP)
    PWR_ClearFlag(PWR_FLAG_WU); //清除唤醒标志
    PWR_EnterSTANDBYMode(); //进入待机状态
}

main.c

#include "systick.h"
#include "led.h"
#include "system.h"
#include "key.h"
#include "usart.h"
#include "wkup.h"


int main()
{
    SysTick_Init(72);  //系统时钟初始
    LED_INIT(); 
    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); 
    USART1_Init(9600);
    
    while(1)
    { 
        printf("5\r\n");
        delay_ms(1000);led1=0;
        
        printf("4\r\n");
        delay_ms(1000);led1=1;
        
        printf("3\r\n");
        delay_ms(1000);led1=0;
        
        printf("2\r\n");
        delay_ms(1000);led1=1;
        
        printf("1\r\n");
        delay_ms(1000);led1=0;
        
        Enter_Standby_Mode();
        
    }
}
//串口助手显示54321后进入待机状态