RTC ERROR (Lost DATE when reset)

[Skalibur]

Hello everyone.

I need help with RTC, im trying to implement RTC on STM32f1.

I configure with CubeMX

RTC_HandleTypeDef hrtc; RTC_TimeTypeDef sTime; RTC_DateTypeDef sDate; /* RTC init function */ void MX_RTC_Init(void) { /**Initialize RTC Only */ hrtc.Instance = RTC; hrtc.Init.AsynchPrediv = RTC_AUTO_1_SECOND; hrtc.Init.OutPut = RTC_OUTPUTSOURCE_NONE; if (HAL_RTC_Init(&hrtc) != HAL_OK) { Error_Handler(); } }

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RTC_HandleTypeDef hrtc; RTC_TimeTypeDef sTime; RTC_DateTypeDef sDate;   /* RTC init function */ void MX_RTC_Init(void) {       /**Initialize RTC Only     */   hrtc.Instance = RTC;   hrtc.Init.AsynchPrediv = RTC_AUTO_1_SECOND;   hrtc.Init.OutPut = RTC_OUTPUTSOURCE_NONE;   if (HAL_RTC_Init(&hrtc) != HAL_OK)   {     Error_Handler();   }   }

Later in my main

case ‘q’: // Read { HAL_RTC_GetDate(&hrtc, &sDate, FORMAT_BCD); HAL_RTC_GetTime(&hrtc, &sTime, FORMAT_BCD); fecha[0] = (sDate.Date >> 4) + 0x30; fecha[1] = (sDate.Date & 0x0F) + 0x30; fecha[3] = (sDate.Month >> 4) + 0x30; fecha[4] = (sDate.Month & 0x0F) + 0x30; fecha[6] = (sDate.Year >> 4) + 0x30; fecha[7] = (sDate.Year & 0x0F) + 0x30; hora[0] = (sTime.Hours >> 4) + 0x30; hora[1] = (sTime.Hours & 0x0F) + 0x30; hora[3] = (sTime.Minutes >> 4) + 0x30; hora[4] = (sTime.Minutes & 0x0F) + 0x30; hora[6] = (sTime.Seconds >> 4) + 0x30; hora[7] = (sTime.Seconds & 0x0F) + 0x30; hora[8] = 0x09; hora[9] = 0x0A; hora[10] = 0x0D; HAL_UART_Transmit(&huart2, (uint8_t*) fecha, strlen(fecha), HAL_MAX_DELAY); HAL_UART_Transmit(&huart2, (uint8_t*) hora, strlen(hora), HAL_MAX_DELAY); } break; case ‘Q’: // Write { sTime.Hours = 0x16; sTime.Minutes = 0x10; sTime.Seconds = 0x00; if (HAL_RTC_SetTime(&hrtc, &sTime, RTC_FORMAT_BCD) != HAL_OK){Error_Handler();} sDate.WeekDay = RTC_WEEKDAY_TUESDAY; sDate.Month = RTC_MONTH_FEBRUARY; sDate.Date = 0x21; sDate.Year = 0x17; if (HAL_RTC_SetDate(&hrtc, &sDate, RTC_FORMAT_BCD) != HAL_OK){Error_Handler();} } break;

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case ‘q’: // Read   {   HAL_RTC_GetDate(&hrtc, &sDate, FORMAT_BCD);   HAL_RTC_GetTime(&hrtc, &sTime, FORMAT_BCD);     fecha[0] = (sDate.Date >> 4) + 0x30;   fecha[1] = (sDate.Date & 0x0F) + 0x30;   fecha[3] = (sDate.Month >> 4) + 0x30;   fecha[4] = (sDate.Month & 0x0F) + 0x30;   fecha[6] = (sDate.Year >> 4) + 0x30;   fecha[7] = (sDate.Year & 0x0F) + 0x30;     hora[0] = (sTime.Hours >> 4) + 0x30;   hora[1] = (sTime.Hours & 0x0F) + 0x30;   hora[3] = (sTime.Minutes >> 4) + 0x30;   hora[4] = (sTime.Minutes & 0x0F) + 0x30;   hora[6] = (sTime.Seconds >> 4) + 0x30;   hora[7] = (sTime.Seconds & 0x0F) + 0x30;   hora[8] = 0x09;   hora[9] = 0x0A;   hora[10] = 0x0D;     HAL_UART_Transmit(&huart2, (uint8_t*) fecha, strlen(fecha), HAL_MAX_DELAY);   HAL_UART_Transmit(&huart2, (uint8_t*) hora, strlen(hora), HAL_MAX_DELAY);   }   break;     case ‘Q’: // Write   {   sTime.Hours = 0x16;   sTime.Minutes = 0x10;   sTime.Seconds = 0x00;     if (HAL_RTC_SetTime(&hrtc, &sTime, RTC_FORMAT_BCD) != HAL_OK){Error_Handler();}     sDate.WeekDay = RTC_WEEKDAY_TUESDAY;   sDate.Month = RTC_MONTH_FEBRUARY;   sDate.Date = 0x21;   sDate.Year = 0x17;     if (HAL_RTC_SetDate(&hrtc, &sDate, RTC_FORMAT_BCD) != HAL_OK){Error_Handler();}   }   break;

I have a 3v battery to vBat CR2032 and test on Therminal. (For unknown reason can’t use debug on eclipse) but this is the problem.

At first init if press “q” (Read sTime and sDate) return this:

01/01/00 00:04:37 // Wrong DATE Correct Time

If press “Q” (to write) and then “q” (to read) return this:

21/02/17 00:04:10 // Correct Date and TIME

If disconnect power supply of STM32, and then connect and press “q” (Read sTime and sDate) return this:

01/01/00 00:05:01 // Lost DATE but TIME its correct!!

Resume, I need write DATE every time after reset or lost power, but TIME always its correct.

if (HAL_RTC_SetDate(&hrtc, &sDate, RTC_FORMAT_BCD) != HAL_OK) { Error_Handler(); }

Why lost DATE?

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