WWDG reset failure In the Self Test library
MCU : STM32H743ZTi
OS : RTEMS
STL: en.x-cube-classb-v2-3-0
STL code integrated with RTEMS os plat form and STL test initiated from boot start area. WWDG test is working as expected until RTC and HAL_PWR_EnableBkUpAccess is disable.
After enabling the RTC and back access area, WWDG not firing the reset and code staying at tim7(hal tick time).
/**
* @brief RTC Initialization Function
* @param None
* @retval None
*/
void MX_RTC_Init(void)
{
/* 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 */
/* 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.OutPutPolarity = RTC_OUTPUT_POLARITY_HIGH;
hrtc.Init.OutPutType = RTC_OUTPUT_TYPE_OPENDRAIN;
hrtc.Init.OutPutRemap = RTC_OUTPUT_REMAP_NONE;
if (HAL_RTC_Init(&hrtc) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN Check_RTC_BKUP */
if(HAL_RTCEx_BKUPRead(&hrtc, RTC_BKP_DR0) != 0x32F2){
/* USER CODE END Check_RTC_BKUP */
/** Initialize RTC and set the Time and Date
*/
sTime.Hours = 0;
sTime.Minutes = 0;
sTime.Seconds = 0;
sTime.DayLightSaving = RTC_DAYLIGHTSAVING_NONE;
sTime.StoreOperation = RTC_STOREOPERATION_RESET;
if (HAL_RTC_SetTime(&hrtc, &sTime, RTC_FORMAT_BIN) != HAL_OK)
{
Error_Handler();
}
sDate.WeekDay = RTC_WEEKDAY_MONDAY;
sDate.Month = RTC_MONTH_JANUARY;
sDate.Date = 1;
sDate.Year = 0;
if (HAL_RTC_SetDate(&hrtc, &sDate, RTC_FORMAT_BIN) != HAL_OK)
{
Error_Handler();
}
/** Enable the TimeStamp
*/
if (HAL_RTCEx_SetTimeStamp(&hrtc, RTC_TIMESTAMPEDGE_RISING, RTC_TIMESTAMPPIN_DEFAULT) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN RTC_Init 2 */
HAL_RTCEx_BKUPWrite(&hrtc,RTC_BKP_DR0,0x32F2);
}
/* USER CODE END RTC_Init 2 */
}
/******************************************************************************/
/**
* @brief write the test result into the backup register
*
* @param : testResult
*
* @retval : None
*/
void stlBackupRegWrite(uint32_t testResult)
{
__HAL_RTC_WRITEPROTECTION_DISABLE(&hrtc);
HAL_PWR_EnableBkUpAccess();
HAL_RTCEx_BKUPWrite(&hrtc, RTC_BKP_DR0, testResult);
//__HAL_RTC_WRITEPROTECTION_ENABLE(&hrtc);
if (testResult != stlBackupRegRead() )
{
#if defined(STL_VERBOSE) || defined(STL_VERBOSE_POR)
stlPrintf("backup write failed!");
#endif
}
HAL_PWR_DisableBkUpAccess();
}
/******************************************************************************/
/**
* @brief read the test result from backup register
*
* @param : void
*
* @retval : test result
*/
uint32_t stlBackupRegRead(void)
{
uint32_t readData;
HAL_PWR_EnableBkUpAccess();
readData = HAL_RTCEx_BKUPRead(&hrtc, RTC_BKP_DR1);
HAL_PWR_DisableBkUpAccess();
return readData;
}
Is there any relation between WWDG and Backup access ?
Please let me know any finds. For our application we need to store STL test result in the backup register.