STM32笔记--低功耗与RTC唤醒

硬件平台： STM32L051

 void system_stop(void) 
{ 
    __HAL_RCC_AHB_FORCE_RESET(); 
    __HAL_RCC_APB1_FORCE_RESET(); 
    __HAL_RCC_APB2_FORCE_RESET(); 
    __HAL_RCC_PWR_CLK_ENABLE();             
    HAL_PWR_EnableBkUpAccess();     
    __HAL_PWR_CLEAR_FLAG(PWR_FLAG_SB); 
    __HAL_RTC_WRITEPROTECTION_DISABLE(&hrtc);   
    __HAL_RTC_WAKEUPTIMER_DISABLE_IT(&hrtc,RTC_IT_WUT);
    __HAL_RTC_TIMESTAMP_DISABLE_IT(&hrtc,RTC_IT_TS);
    __HAL_RTC_ALARM_CLEAR_FLAG(&hrtc,RTC_FLAG_ALRAF | RTC_FLAG_ALRBF); 
    __HAL_RTC_TIMESTAMP_CLEAR_FLAG(&hrtc,RTC_FLAG_TSF); 
    __HAL_RTC_WAKEUPTIMER_CLEAR_FLAG(&hrtc,RTC_FLAG_WUTF); 
    __HAL_RCC_BACKUPRESET_RELEASE();                   
    __HAL_RTC_WRITEPROTECTION_ENABLE(&hrtc);   
    __HAL_PWR_CLEAR_FLAG(PWR_FLAG_WU);  
    HAL_PWR_EnterSTOPMode(PWR_LOWPOWERREGULATOR_ON, PWR_STOPENTRY_WFI); 
}