STM32Cube RTC Clock issues

[gvigelette]

Posted on August 29, 2014 at 16:09

Hi Everyone, hopefully someone can shed some light on my issue that I keep seeing.  I set the RTC clock from the cellular chipset and get the time every minute with the following results.

Global Date: Aug 29, 2014  Time: 08:49 AMUpdated Time: 08:49 AMUpdated Time: 08:50 AMUpdated Time: 08:51 AMUpdated Time: 08:52 AMUpdated Time: 08:53 AMUpdated Time: 08:54 AMUpdated Time: 08:55 AMUpdated Time: 08:56 AMUpdated Time: 08:57 AMUpdated Time: 08:64 AMDATA: AT+CCLK?DATA: +CCLK: ''14/08/29,09:27:16-16''Setting RTC ClockUpdated Time: 09:28 AMUpdated Time: 09:29 AMUpdated Time: 09:30 AMUpdated Time: 09:31 AMUpdated Time: 09:16 AMUpdated Time: 09:16 AMUpdated Time: 09:17 AMUpdated Time: 09:18 AMUpdated Time: 09:19 AMUpdated Time: 09:20 AMUpdated Time: 09:21 AMAs you can see for the first few minutes the clock updates as expected and then starts to have issues.I am using STM32Cube with FreeRTOS on a STM32F415VG processor using HSE and LSI for the clock settings.  The following are the functions used to configure, set the time, and update my time string./** System Clock Configuration*/void SystemClock_Config(void){  RCC_ClkInitTypeDef RCC_ClkInitStruct;  RCC_PeriphCLKInitTypeDef PeriphClkInitStruct;  RCC_OscInitTypeDef RCC_OscInitStruct;  __PWR_CLK_ENABLE();  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSI|RCC_OSCILLATORTYPE_HSE;  RCC_OscInitStruct.HSEState = RCC_HSE_ON;  RCC_OscInitStruct.LSIState = RCC_LSI_ON;  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;  RCC_OscInitStruct.PLL.PLLM = 8;  RCC_OscInitStruct.PLL.PLLN = 336;  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;  RCC_OscInitStruct.PLL.PLLQ = 7;  HAL_RCC_OscConfig(&RCC_OscInitStruct);  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_SYSCLK|RCC_CLOCKTYPE_PCLK1                              |RCC_CLOCKTYPE_PCLK2;  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;  HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5);   PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_RTC;  PeriphClkInitStruct.RTCClockSelection = RCC_RTCCLKSOURCE_LSI;  HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct);}/* RTC init function */void MX_RTC_Init(void){   /**Initialize RTC and set the Time and Date   */  hrtc.Instance = RTC;  hrtc.Init.HourFormat = RTC_HOURFORMAT_12;  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;  HAL_RTC_Init(&hrtc);}void HAL_RTC_MspInit(RTC_HandleTypeDef* hrtc){ __HAL_RCC_RTC_ENABLE(); }int8_t rtc_SetDateTime(char* dateTimeStr){  RTC_TimeTypeDef sTime;  RTC_DateTypeDef sDate; uint8_t month; uint8_t date; uint8_t year; uint8_t hour; uint8_t minute; uint8_t second; uint8_t ssecond; char* pData = NULL; // parse string pData = strstr(dateTimeStr, ''\''''); if(pData != NULL) { pData++; //sscanf(dateTimeStr, ''%hhu/%hhu/%hhu %hhu:%hhu:%hhu'', &sDate.Month, &sDate.Date, &sDate.Year, &sTime.Hours, &sTime.Minutes , &sTime.Seconds); sscanf(pData, ''%hhu/%hhu/%hhu,%hhu:%hhu:%hhu-%hhu'', &year, &month, &date, &hour, &minute, &second, &ssecond); if(hour>12) { sTime.Hours = hour-12; sTime.TimeFormat = RTC_HOURFORMAT12_PM; } else { sTime.Hours = hour; sTime.TimeFormat = RTC_HOURFORMAT12_AM; } sTime.Minutes = minute; sTime.Seconds = second; sTime.SubSeconds = ssecond; sDate.Month = month; sDate.Date = date; sDate.Year = year; sTime.DayLightSaving = RTC_DAYLIGHTSAVING_NONE; sTime.StoreOperation = RTC_STOREOPERATION_RESET; sDate.WeekDay = RTC_WEEKDAY_FRIDAY; if(HAL_RTC_SetDate(&hrtc,&sDate,FORMAT_BCD) != HAL_OK) { printf(''Error setting the Date\n\r''); } if(HAL_RTC_SetTime(&hrtc,&sTime,FORMAT_BCD) != HAL_OK) { printf(''Error setting the Time\n\r''); } return 1; } return 0;}int8_t rtc_UpdateTime(void){   RTC_TimeTypeDef sTime;   memset(g_timeStr,0,9); HAL_RTC_GetTime(&hrtc, &sTime, FORMAT_BCD); sprintf(g_timeStr, ''%02hhu:%02hhu %s'', sTime.Hours, sTime.Minutes, sTime.TimeFormat==0x00?''AM'':''PM''); printf(''Updated Time: %s\n\r'', g_timeStr); return 1; }Any help would be greatly appreciated, and thank you in advance.George #whiskey-tango-foxtrot #stm32 #rtc #wakeup #timer

[Tesla DeLorean]

Posted on August 29, 2014 at 16:38

Updated Time: 08:57 AM

Updated Time: 08:64 AM

64!!!? You are using BCD, this means Hexadecimal like presentation where the high/low nibbles hold 0-9 values, perhaps you want to use binary, 0..59 ? 57 -> 0x39 64 -> 0x40

[gvigelette]

Posted on August 29, 2014 at 16:49Thanks Clive,I just figured it out and re-formatted my functions to use BCD correctly.