使用芯源CW32 MCU实现低功耗模式下的RTC定时唤醒功能

void RTC_Init(void) {

    RTC_TimeTypeDef sTime = {0};

    RTC_DateTypeDef sDate = {0};



    // 使能RTC时钟

    __HAL_RCC_RTC_ENABLE();

    

    // 配置RTC时钟源为LSE

    RTC_HandleTypeDef hrtc;

    hrtc.Instance = RTC;

    hrtc.Init.HourFormat = RTC_HOURFORMAT_24;

    hrtc.Init.AsynchPrediv = 127;

    hrtc.Init.SynchPrediv = 255;

    hrtc.Init.OutPut = RTC_OUTPUT_DISABLE;

    hrtc.Init.OutPutRemap = RTC_OUTPUT_REMAP_NONE;

    hrtc.Init.OutPutPolarity = RTC_OUTPUT_POLARITY_HIGH;

    hrtc.Init.OutPutType = RTC_OUTPUT_TYPE_OPENDRAIN;



    if (HAL_RTC_Init(&hrtc) != HAL_OK) {

        Error_Handler();

    }



    // 设置时间

    sTime.Hours = 0x12;

    sTime.Minutes = 0x30;

    sTime.Seconds = 0x00;

    HAL_RTC_SetTime(&hrtc, &sTime, RTC_FORMAT_BIN);

    

    // 设置日期

    sDate.WeekDay = RTC_WEEKDAY_MONDAY;

    sDate.Month = RTC_MONTH_JANUARY;

    sDate.Date = 0x01;

    sDate.Year = 0x21;

    HAL_RTC_SetDate(&hrtc, &sDate, RTC_FORMAT_BIN);

}

void Enter_LowPowerMode(void) {

    // 使能RTC中断

    HAL_NVIC_SetPriority(RTC_Alarm_IRQn, 0, 0);

    HAL_NVIC_EnableIRQ(RTC_Alarm_IRQn);



    // 设置闹钟触发时间，1分钟后唤醒

    RTC_AlarmTypeDef sAlarm = {0};

    sAlarm.AlarmTime.Hours = 0x12;

    sAlarm.AlarmTime.Minutes = 0x31;

    sAlarm.AlarmTime.Seconds = 0x00;

    sAlarm.Alarm = RTC_ALARM_A;

    HAL_RTC_SetAlarm_IT(&hrtc, &sAlarm, RTC_FORMAT_BIN);



    // MCU进入低功耗模式

    HAL_PWR_EnterSLEEPMode(PWR_MAINREGULATOR_ON, PWR_SLEEPENTRY_WFI);

}

void RTC_Alarm_IRQHandler(void) {

    HAL_RTC_AlarmIRQHandler(&hrtc);



    // 获取当前时间

    RTC_TimeTypeDef sTime;

    RTC_DateTypeDef sDate;

    

    HAL_RTC_GetTime(&hrtc, &sTime, RTC_FORMAT_BIN);

    HAL_RTC_GetDate(&hrtc, &sDate, RTC_FORMAT_BIN);



    printf("当前时间: %02d:%02d:%02d\n", sTime.Hours, sTime.Minutes, sTime.Seconds);

}