I'm trying to wake my STM32L471 up from STOP2 sleep mode using the RTC Alarm. I successfully get it to sleep, and then I'm using the code from the STMCube Example projects (\STM32Cube_FW_L0_V1.11.0) to try to wake it, but not succeeding. Is anyone able to help? Alarm code is below:
RTC_HandleTypeDef RtcHandle;
RTC_DateTypeDef sdatestructure_set = {0};
RTC_TimeTypeDef stimestructure = {0};
RTC_AlarmTypeDef salarmstructure = {{0}, 0};
/*##-1- Configure the Date #################################################*/
/* Set Date: October 31th 2014 */
sdatestructure_set.Year = 14;
sdatestructure_set.Month = RTC_MONTH_OCTOBER;
sdatestructure_set.Date = 31;
//sdatestructure_set.WeekDay = RTC_WEEKDAY_SUNDAY;
if(HAL_RTC_SetDate(&RtcHandle,&sdatestructure_set,RTC_FORMAT_BCD) != HAL_OK)
{
/* Initialization Error */
Error_Handler();
}
/*##-2- Configure the Time #################################################*/
/* Set Time: 23:59:55 */
stimestructure.Hours = 23;
stimestructure.Minutes = 59;
stimestructure.Seconds = 55;
stimestructure.TimeFormat = RTC_HOURFORMAT12_AM;
stimestructure.DayLightSaving = RTC_DAYLIGHTSAVING_NONE ;
stimestructure.StoreOperation = RTC_STOREOPERATION_RESET;
if(HAL_RTC_SetTime(&RtcHandle,&stimestructure,RTC_FORMAT_BCD) != HAL_OK)
{
/* Initialization Error */
Error_Handler();
}
/*##-3- Configure the RTC Alarm peripheral #################################*/
/* Set Alarm to 00:00:10
RTC Alarm Generation: Alarm on Hours, Minutes and Seconds */
salarmstructure.Alarm = RTC_ALARM_A;
salarmstructure.AlarmDateWeekDay = RTC_WEEKDAY_MONDAY;
salarmstructure.AlarmDateWeekDaySel = RTC_ALARMDATEWEEKDAYSEL_DATE;
salarmstructure.AlarmMask = RTC_ALARMMASK_DATEWEEKDAY;
salarmstructure.AlarmSubSecondMask = RTC_ALARMSUBSECONDMASK_NONE;
salarmstructure.AlarmTime.TimeFormat = RTC_HOURFORMAT12_AM;
salarmstructure.AlarmTime.Hours = 00;
salarmstructure.AlarmTime.Minutes = 00;
salarmstructure.AlarmTime.Seconds = 30;
if(HAL_RTC_SetAlarm_IT(&RtcHandle,&salarmstructure,RTC_FORMAT_BCD) != HAL_OK)
{
/* Initialization Error */
Error_Handler();
}
__HAL_RTC_ALARM_ENABLE_IT(&RtcHandle,RTC_IT_ALRA);
__HAL_PWR_CLEAR_FLAG(PWR_FLAG_WU);
HAL_PWREx_EnterSTOP2Mode(PWR_STOPENTRY_WFI);
void HAL_RTC_AlarmAEventCallback(RTC_HandleTypeDef *hrtc)
{
NVIC_SystemRestart();
}
