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();
}

 

[Hai]

Hello @shivss 

Could you please ensure that the RTC wake-up timer interrupt is properly configured by adding the following functions ? Once done, kindly let us know if the issue persists:

 /* Enable WakeUp line functionality for the RTC ALARMA */
 HAL_PWR_EnableWakeUpPin(PWR_WAKEUP_PIN7_HIGH_3);

 /* Enable the Autonomous Mode for the RTC */
 __HAL_RCC_RTCAPB_CLKAM_ENABLE();

Best regards,

Haifa.

[shivss]

Hi @Hai 

 
HAL_RTCEx_DeactivateWakeUpTimer(&hrtc);

/*functionality for the RTC ALARMA */
 HAL_PWR_EnableWakeUpPin(PWR_WAKEUP_PIN7_HIGH_3);

 /* Enable the Autonomous Mode for the RTC */
 __HAL_RCC_RTCAPB_CLKAM_ENABLE();

 __HAL_RTC_WAKEUPTIMER_CLEAR_FLAG(&hrtc, RTC_FLAG_WUTF);/* Enable WakeUp line 

I have added after the deactivate wakeup timer  then it wakeup one time after then when am trying to send it again back to standby/shutdown then its not even entering into standby/shutdown its getting hang   

[shivss]

Hi @Hai 

 Waiting the reply with solution . Thanks

[shivss]

HI ,

any reply ? can you guys give me example code for all sleep ,stop and shutdown and standby ? or any working code

[Saket_Om]

Hello @shivss 

Could you check the article below:

How to configure the RTC to wake up the STM32 peri... - STMicroelectronics Community

[shivss]

HI @Saket_Om 

 

That is for different board and more over that is not standby or shutdown mode?

[pyszny]

Hello @shivss 
Were you able to solve the problem?

[NFern.1]

Hi @shivss @pyszny 

Could you figure out the correct configuration to wake-up from Shut-down using RTC Alarm for U5x MCUs? Please share your solution if possible. Thanks!