Wakeup Standby from WKUP pin AND RTC Timer

[yoann2]

Posted on July 22, 2016 at 16:08

Hello,

I have problem to wake up from standby mode. I ma working on STM32L162, WKUP2 is on PC13 I succeed to wake from RTC timer or with the WKUP2 pin individually on my board, but when i want to be wake from one or the other i have problem. I can be wake from WKUP pin when i am in standby but not with the RTC. After the delay of RTC timer passed i can't be wakeup from WKUP it's seems that there a conflict maybe on the interrupt... My code is below, i comment ''HAL_RTCEx_SetWakeUpTimer_IT'' to be wake from WKUP and ''HAL_PWR_EnableWakeUpPin'' to be wake from RTC timer (timeout is 10s)

void enter_standby_mode(void)
{
/* RTC configuration */ 
RTCHandle.Instance = RTC; 
RTCHandle.Init.HourFormat = RTC_HOURFORMAT_24;
RTCHandle.Init.AsynchPrediv =0x7F; // LSE as RTC clock: RTC_ASYNCH_PREDIV
RTCHandle.Init.SynchPrediv = 0x00FF; // LSE as RTC clock: RTC_SYNCH_PREDIV;
RTCHandle.Init.OutPut = RTC_OUTPUT_DISABLE;
RTCHandle.Init.OutPutPolarity = RTC_OUTPUT_POLARITY_HIGH;
RTCHandle.Init.OutPutType = RTC_OUTPUT_TYPE_OPENDRAIN;
/* Disable Wake-up timer */ 
HAL_RTCEx_DeactivateWakeUpTimer(&RTCHandle);
/* Clear PWR wake up Flag */
__HAL_PWR_CLEAR_FLAG(PWR_FLAG_WU);
/* Clear RTC Wake Up timer Flag */
__HAL_RTC_WAKEUPTIMER_CLEAR_FLAG(&RTCHandle, RTC_FLAG_WUTF);
/* Setting the Wake up time */
HAL_RTCEx_SetWakeUpTimer_IT(&RTCHandle, 0x000A, RTC_WAKEUPCLOCK_CK_SPRE_16BITS); 
/* Set WKUP2 as Wake Up pin */
HAL_PWR_EnableWakeUpPin(0x0200);
__HAL_PWR_CLEAR_FLAG(PWR_FLAG_WU);
/* Request to enter STANDBY mode */ 
HAL_PWR_EnterSTANDBYMode(); 
}

Did someone already succeed to be wake from different potential source ? Thanks #rtc #standby #pwr #wkup