Standby and Shutdown mode in stm32u585 using RTC

[shivss]

Hi,

  I am on stm32u585 IOT dev board for low power modes am using RTC wakeup the sleep and stop 1,2 and 3 are working fine but standby and shutdown is not working ? my code 

void sleep(int mode, int seconds ) {

if (seconds <= 0) return;

 HAL_RTCEx_DeactivateWakeUpTimer(&hrtc);

 __HAL_RTC_WAKEUPTIMER_CLEAR_FLAG(&hrtc, RTC_FLAG_WUTF);

uint32_t wakeup_counter  (uint32_t)(seconds  2048);

 HAL_RTCEx_SetWakeUpTimer_IT(&hrtc, wakeup_counter, RTC_WAKEUPCLOCK_RTCCLK_DIV16, 0);




switch (mode) {

case 0: // Sleep

 HAL_SuspendTick();

HAL_PWR_EnterSLEEPMode(PWR_MAINREGULATOR_ON, PWR_SLEEPENTRY_WFI);

 HAL_ResumeTick();

break;

case 1: // Stop0

 HAL_SuspendTick();

 HAL_PWREx_EnterSTOP1Mode(PWR_STOPENTRY_WFI);

break;

case 2: // Stop1

 HAL_SuspendTick();

 HAL_PWREx_EnterSTOP2Mode(PWR_STOPENTRY_WFI);

break;

case 3: // Stop2

 HAL_SuspendTick();

 HAL_PWREx_EnterSTOP3Mode(PWR_STOPENTRY_WFI);

break;

case 4: // Standby

 __HAL_PWR_CLEAR_FLAG(PWR_WAKEUP_ALL_FLAG | PWR_FLAG_SBF);

 HAL_PWR_EnterSTANDBYMode();

break;

case 5; // Shutdown/DeepSleep

 __HAL_PWR_CLEAR_FLAG(PWR_WAKEUP_ALL_FLAG | PWR_FLAG_SBF);

 HAL_PWREx_EnterSHUTDOWNMode();

break;

default:

break;

 }

}

void HAL_RTCEx_WakeUpTimerEventCallback(RTC_HandleTypeDef *hrtc) {

 HAL_RTCEx_DeactivateWakeUpTimer(&hrtc);

 SystemClock_Config();

 HAL_ResumeTick();
}

[Saket_Om]

Hello @shivss 

The device cannot enter on standby and shutdown mode or cannot exit? 

Please refer to the example below: 

STM32CubeU5/Projects/NUCLEO-U545RE-Q/Examples/PWR/PWR_STANDBY at main · STMicroelectronics/STM32CubeU5 · GitHub

Note that The RTC remains active when the RTC clock source is LSE or LSI.

[shivss]

Hi,

It is not exit from standby and shutdown modes. The example code is using Wakeup pin but want I need is wakeup with RTC .In RTC INIT checking for wakeup same as in example . This code is working for sleep,stop1,2 and 3 the RTC is working fine  with these modes but not for standby or shutdown even UART messages are also not printing after standby or shutdown

static void MX_RTC_Init(void)
{

  /* USER CODE BEGIN RTC_Init 0 */
	uart_send("RTC start\r\n");
	// Check if waking from Standby — if yes, skip full init
	  if (__HAL_PWR_GET_FLAG(PWR_FLAG_SBF) != RESET)
	  {
		  uart_send(">> Woke from STANDBY\r\n");
	      __HAL_PWR_CLEAR_FLAG(PWR_FLAG_SBF);  // Clear standby flag

	      HAL_RTCEx_DeactivateWakeUpTimer(&hrtc);
	  }

  /* USER CODE END RTC_Init 0 */

void sleep(int mode, int seconds ) {

if (seconds <= 0) return;

 HAL_RTCEx_DeactivateWakeUpTimer(&hrtc);

 __HAL_RTC_WAKEUPTIMER_CLEAR_FLAG(&hrtc, RTC_FLAG_WUTF);

uint32_t wakeup_counter  (uint32_t)(seconds  2048);

 HAL_RTCEx_SetWakeUpTimer_IT(&hrtc, wakeup_counter, RTC_WAKEUPCLOCK_RTCCLK_DIV16, 0);




switch (mode) {

case 0: // Sleep

 HAL_SuspendTick();

HAL_PWR_EnterSLEEPMode(PWR_MAINREGULATOR_ON, PWR_SLEEPENTRY_WFI);

 HAL_ResumeTick();

break;

case 1: // Stop0

 HAL_SuspendTick();

 HAL_PWREx_EnterSTOP1Mode(PWR_STOPENTRY_WFI);

break;

case 2: // Stop1

 HAL_SuspendTick();

 HAL_PWREx_EnterSTOP2Mode(PWR_STOPENTRY_WFI);

break;

case 3: // Stop2

 HAL_SuspendTick();

 HAL_PWREx_EnterSTOP3Mode(PWR_STOPENTRY_WFI);

break;

case 4: // Standby

 __HAL_PWR_CLEAR_FLAG(PWR_WAKEUP_ALL_FLAG | PWR_FLAG_SBF);

 HAL_PWR_EnterSTANDBYMode();

break;

case 5; // Shutdown/DeepSleep

 __HAL_PWR_CLEAR_FLAG(PWR_WAKEUP_ALL_FLAG | PWR_FLAG_SBF);

 HAL_PWREx_EnterSHUTDOWNMode();

break;

default:

break;

 }

}

void HAL_RTCEx_WakeUpTimerEventCallback(RTC_HandleTypeDef *hrtc) {

 HAL_RTCEx_DeactivateWakeUpTimer(&hrtc);

 SystemClock_Config();

 HAL_ResumeTick();
}