STM32F1待机模式PA0无法唤醒

Corgih · 发表于 2022-9-21 17:07:33

#include "wkup.h"

static u8 t = 0 ;

void STANBY(void) {

RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR,ENABLE);
// PWR->CSR|=1<<8;       //设置WKUP用于唤醒
PWR_WakeUpPinCmd(ENABLE);       //使能WKUP唤醒引脚
PWR_EnterSTANDBYMode();       //进入待机模式
}

void EN_STANBY(void){

RCC_APB2PeriphResetCmd(0X01FC,DISABLE); //复位所有IO口

STANBY();
}

void WKUP_Init(void) {

GPIO_InitTypeDef GPIO_InitStructure;
EXTI_InitTypeDef EXTI_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO,ENABLE);

//POWER_KEY
GPIO_InitStructure.GPIO_Pin  = GPIO_Pin_0;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_Init(GPIOA, &GPIO_InitStructure);

GPIO_EXTILineConfig(GPIO_PortSourceGPIOA,GPIO_PinSource0);       //配置外部中断与GPIOA连接

EXTI_InitStructure.EXTI_Line = EXTI_Line0;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;       //中断模式
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;       //下降沿触发
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);

NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

//if(POWER_CHECK() == 0) STANBY();
}

void EXTI0_IRQHandler(void){

EXTI_ClearITPendingBit(EXTI_Line0);       //清除外部中断线0上的中断标志位

if(POWER_CHECK()) {

      EN_STANBY();
}
}

u8 POWER_CHECK(void) {

while(1) {

      if(power_check) {

         return 0;
      }
      else {

//          t++;

//          delay_ms(30);
//
//          if(t >= 100) {
//
//             t = 0;
            return 1;
         //}
      }
}
}

根据原子的demo，结合实际情况，外部PA0是接了外部上拉的，所以这里PA0外部中断设置为下降沿触发，但是这个状态待机之后，唤醒不了，还是说待机唤醒触发，只能是PA0的上升沿？