STM32G030 Can't setup RTC, HAL_RTC_Init always return HAL_TIMEOUT

[fgroleau]

Hi, i'm trying to set up the RTC timer to be able to use the alarm and HAL_RTC_Init always return HAL_TIMEOUT. It seem like RTC_ICSR_INITF never go to 1.

uint8_t init_RTC()
{
	 /* USER CODE BEGIN RTC_Init 0 */

	  /* USER CODE END RTC_Init 0 */

	  RTC_TimeTypeDef sTime = {0};
	  RTC_DateTypeDef sDate = {0};

	  /* USER CODE BEGIN RTC_Init 1 */
	  HAL_PWR_EnableBkUpAccess();

	  __HAL_RCC_LSI_ENABLE();
	  __HAL_RCC_RTC_CONFIG(RCC_RTCCLKSOURCE_LSI);

	  __HAL_RCC_RTC_ENABLE();
	  while((RCC->CSR & 0x2) == 0);//wait till the clock is ready
	  /* USER CODE END RTC_Init 1 */


	  /** Initialize RTC Only
	  */
	  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;
	  hrtc.Init.OutPutPullUp = RTC_OUTPUT_PULLUP_NONE;

	  if(HAL_RTC_Init(&hrtc) != HAL_OK)
	  {
	    return 1;
	  }

	  /** Initialize RTC and set the Time and Date
	  */
	  sTime.Hours = 0x0;
	  sTime.Minutes = 0x0;
	  sTime.Seconds = 0x0;
	  sTime.SubSeconds = 0x0;
	  sTime.DayLightSaving = RTC_DAYLIGHTSAVING_NONE;
	  sTime.StoreOperation = RTC_STOREOPERATION_RESET;
	  if (HAL_RTC_SetTime(&hrtc, &sTime, RTC_FORMAT_BCD) != HAL_OK)
	  {
		  return 1;
	  }
	  sDate.WeekDay = RTC_WEEKDAY_MONDAY;
	  sDate.Month = RTC_MONTH_JANUARY;
	  sDate.Date = 0x1;
	  sDate.Year = 0x0;

	  if (HAL_RTC_SetDate(&hrtc, &sDate, RTC_FORMAT_BCD) != HAL_OK)
	  {
		  return 1;
	  }
	  return 0;

}

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[waclawek.jan]

Your RTC clock is not running.

Check in respective RCC registers.

JW

[fgroleau]

Hi,

Thanks for your reply

It's weird because when i try with to see if the clock was running using this function HAL_RCCEx_GetPeriphCLKFreq(RCC_PERIPHCLK_RTC)

The function return that the clock is running at 32kHz wich seem to be the LSI frequency wich is the one i want but the HAL_RTC_Init(&hrtc) function was still returning HAL_TIMEOUT

[waclawek.jan]

OK so what's the content of relevant RCC registers (BDCR, CSR, CR)?

JW

[fgroleau]

At line 33 the value are :

RCC->BDCR = 0x8200

RCC->CSR = 0x1c000003

RCC->CR = 0x3000500

[waclawek.jan · Accepted solution]

These appear to be OK (i.e. LSI selected as RTC clock and LSI indicated as enabled and running).

Is RCC_APBENR1.RTCAPBEN set?

Isn't some tamper source set in RTC?

Try performing backup-domain reset before setting up RTC.

JW

[fgroleau]

Thanks, it seem that setting RCC_APBENR1.RTCAPBEN seem to have fix my issue!