STM32L151定時從Stop模式定時喚醒

void StopRTCLSIMode(int count)

{

EXTI_InitTypeDef EXTI_InitStructure;

PWR_RTCAccessCmd(ENABLE);//Allow access to RTC

RCC_LSICmd(ENABLE);//LSI Enable

while(RCC_GetFlagStatus(RCC_FLAG_LSIRDY)==RESET);//wait till LSI is ready

RCC_RTCCLKConfig(RCC_RTCCLKSource_LSI);//RTC Clock Source Selection

RCC_RTCCLKCmd(ENABLE);//Enable RTC clock

RTC_WaitForSynchro();//wait for RTC APB registers synchronisation

EXTI_ClearITPendingBit(EXTI_Line20);//配置喚醒中斷

EXTI_InitStructure.EXTI_Line = EXTI_Line20;

EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;

EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;

EXTI_InitStructure.EXTI_LineCmd = ENABLE;

EXTI_Init(&EXTI_InitStructure);

RTC_WakeUpCmd(DISABLE);//禁止喚醒計數器

RTC_WakeUpClockConfig(RTC_WakeUpClock_RTCCLK_Div16);//喚醒時鐘16分頻

RTC_SetWakeUpCounter(count);//設置喚醒計數器

RTC_ITConfig(RTC_IT_WUT,EBANLE);//使能喚醒中斷

RTC_WakeUpCmd(ENABLE);//使能喚醒計數器

}

//喚醒中斷

void RTC_WKUP_IRQHandler(void)

{

if(RTC_GetITStatus(RTC_IT_WUT)!=RESET)

{

RTC_ClearITPendingBit(RTC_IT_WUT);

EXTI_ClearITPendingBit(EXTI_Line20);

Systeminit();

StopRTCLSIMode(2312)//~1S 再次初始化定時喚醒時間

//重新初始化外設

isWKUP = 1;

}

}

在主函數中

int main(void)

{

//TO DO

//1.初始化定時喚醒

//2.進入低功耗模式

while(1)

{

if(isWKUP)

{

isWKUP = 0;

//TO DO 喚醒后干一些事情

StopRTCLSIMode(2312)//~1S 再次初始化定時喚醒時間

//進入低功耗模式

}

}

}