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Unable to store the internal rtc time in back-up registers

Ajay_9121
Associate II

Hey buddies, I am working on STM2F103C8T6  microcontroller.  I am using LSI Clock of 40 MHz & using external clock of 36 MHz. I am trying to read the clock after power OFF & ON Low by using the following code(below) . Even though the 3.3v is detected on the VBAT pin, the clock in not getting updated during the power OFF. It is again reading from the previous stored value in the backup register. Pleas help me to resolve this issue.

 

 

/ USER CODE BEGIN Header / /** ****************************************************************************** * @file : main.c * @brief : Main program body ****************************************************************************** * @attention * * Copyright (c) 2024 STMicroelectronics. * All rights reserved. * * This software is licensed under terms that can be found in the LICENSE file * in the root directory of this software component. * If no LICENSE file comes with this software, it is provided AS-IS. * ****************************************************************************** */ / USER CODE END Header / /* Includes ------------------------------------------------------------------*/ #include "main.h" /* Private includes ----------------------------------------------------------*/ / USER CODE BEGIN Includes / / USER CODE END Includes / /* Private typedef -----------------------------------------------------------*/ / USER CODE BEGIN PTD / / USER CODE END PTD / /* Private define ------------------------------------------------------------*/ / USER CODE BEGIN PD / / USER CODE END PD / /* Private macro -------------------------------------------------------------*/ / USER CODE BEGIN PM / / USER CODE END PM / /* Private variables ---------------------------------------------------------*/ RTC_HandleTypeDef hrtc; UART_HandleTypeDef huart3; / USER CODE BEGIN PV / char time[20]; char date[20]; / USER CODE END PV / /* Private function prototypes -----------------------------------------------*/ void SystemClock_Config(void); static void MX_GPIO_Init(void); static void MX_RTC_Init(void); static void MX_USART3_UART_Init(void); / USER CODE BEGIN PFP / / USER CODE END PFP / /* Private user code ---------------------------------------------------------*/ / USER CODE BEGIN 0 / void set_time(void) { RTC_TimeTypeDef sTime; RTC_DateTypeDef DateToUpdate; sTime.Hours = 0x11; sTime.Minutes = 0x20; sTime.Seconds = 0x30; if (HAL_RTC_SetTime(&hrtc, &sTime, RTC_FORMAT_BCD) != HAL_OK) { Error_Handler(); } DateToUpdate.WeekDay = RTC_WEEKDAY_FRIDAY; DateToUpdate.Month = RTC_MONTH_JULY; DateToUpdate.Date = 0x26; DateToUpdate.Year = 0x0; if (HAL_RTC_SetDate(&hrtc, &DateToUpdate, RTC_FORMAT_BCD) != HAL_OK) { Error_Handler(); } HAL_RTCEx_BKUPWrite(&hrtc, RTC_BKP_DR1, 0x32F2); } void get_time(void) { RTC_DateTypeDef gDate; RTC_TimeTypeDef gTime; / Get the RTC current Time / HAL_RTC_GetTime(&hrtc, &gTime, RTC_FORMAT_BIN); / Get the RTC current Date / HAL_RTC_GetDate(&hrtc, &gDate, RTC_FORMAT_BIN); / Display time Format: hh:mm:ss / sprintf((char*)time,"%02d:%02d:%02d",gTime.Hours, gTime.Minutes, gTime.Seconds); / Display date Format: dd-mm-yy / sprintf((char*)date,"%02d-%02d-%2d",gDate.Date, gDate.Month, 2000 + gDate.Year); } void UART_DISPLAY(void) { HAL_UART_Transmit(&huart3, time, sizeof(time), HAL_MAX_DELAY); HAL_UART_Transmit(&huart3, date, sizeof(date), HAL_MAX_DELAY); } / USER CODE END 0 / /** * @brief The application entry point. * @retval int */ int main(void) { / USER CODE BEGIN 1 / / USER CODE END 1 / /* MCU Configuration--------------------------------------------------------*/ / Reset of all peripherals, Initializes the Flash interface and the Systick. / HAL_Init(); / USER CODE BEGIN Init / / USER CODE END Init / / Configure the system clock / SystemClock_Config(); / USER CODE BEGIN SysInit / / USER CODE END SysInit / / Initialize all configured peripherals / MX_GPIO_Init(); MX_RTC_Init(); MX_USART3_UART_Init(); / USER CODE BEGIN 2 / / USER CODE END 2 / if(HAL_RTCEx_BKUPRead(&hrtc,RTC_BKP_DR1)!=0X32F2) { set_time(); } HAL_GPIO_WritePin(GPIOA, GPIO_PIN_15,GPIO_PIN_SET ); HAL_Delay(200); HAL_GPIO_WritePin(GPIOB, GPIO_PIN_13, GPIO_PIN_SET); HAL_Delay(200); HAL_GPIO_WritePin(GPIOA, GPIO_PIN_15,GPIO_PIN_RESET ); HAL_Delay(2000); / Infinite loop / / USER CODE BEGIN WHILE / while (1) { / USER CODE END WHILE / / USER CODE BEGIN 3 / get_time(); UART_DISPLAY(); HAL_Delay(1000); } / USER CODE END 3 / } /** * @brief System Clock Configuration * @retval None */ void SystemClock_Config(void) { RCC_OscInitTypeDef RCC_OscInitStruct = {0}; RCC_ClkInitTypeDef RCC_ClkInitStruct = {0}; RCC_PeriphCLKInitTypeDef PeriphClkInit = {0}; /** Initializes the RCC Oscillators according to the specified parameters * in the RCC_OscInitTypeDef structure. */ RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSI|RCC_OSCILLATORTYPE_HSE; RCC_OscInitStruct.HSEState = RCC_HSE_ON; RCC_OscInitStruct.HSEPredivValue = RCC_HSE_PREDIV_DIV1; RCC_OscInitStruct.HSIState = RCC_HSI_ON; RCC_OscInitStruct.LSIState = RCC_LSI_ON; RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON; RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE; RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL9; if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) { Error_Handler(); } /** Initializes the CPU, AHB and APB buses clocks */ RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|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_DIV2; RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1; if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK) { Error_Handler(); } PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_RTC; PeriphClkInit.RTCClockSelection = RCC_RTCCLKSOURCE_LSI; if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK) { Error_Handler(); } } /** * @brief RTC Initialization Function * @PAram None * @retval None */ static void MX_RTC_Init(void) { / USER CODE BEGIN RTC_Init 0 / / USER CODE END RTC_Init 0 / RTC_TimeTypeDef sTime = {0}; RTC_DateTypeDef DateToUpdate = {0}; / USER CODE BEGIN RTC_Init 1 / / USER CODE END RTC_Init 1 / /** Initialize RTC Only */ hrtc.Instance = RTC; hrtc.Init.AsynchPrediv = RTC_AUTO_1_SECOND; hrtc.Init.OutPut = RTC_OUTPUTSOURCE_ALARM; if (HAL_RTC_Init(&hrtc) != HAL_OK) { Error_Handler(); } / USER CODE BEGIN Check_RTC_BKUP / / USER CODE END Check_RTC_BKUP / /** Initialize RTC and set the Time and Date */ sTime.Hours = 0x11; sTime.Minutes = 0x20; sTime.Seconds = 0x30; if (HAL_RTC_SetTime(&hrtc, &sTime, RTC_FORMAT_BCD) != HAL_OK) { Error_Handler(); } DateToUpdate.WeekDay = RTC_WEEKDAY_FRIDAY; DateToUpdate.Month = RTC_MONTH_JULY; DateToUpdate.Date = 0x26; DateToUpdate.Year = 0x0; if (HAL_RTC_SetDate(&hrtc, &DateToUpdate, RTC_FORMAT_BCD) != HAL_OK) { Error_Handler(); } / USER CODE BEGIN RTC_Init 2 / / USER CODE END RTC_Init 2 / } /** * @brief USART3 Initialization Function * @PAram None * @retval None */ static void MX_USART3_UART_Init(void) { / USER CODE BEGIN USART3_Init 0 / / USER CODE END USART3_Init 0 / / USER CODE BEGIN USART3_Init 1 / / USER CODE END USART3_Init 1 / huart3.Instance = USART3; huart3.Init.BaudRate = 115200; huart3.Init.WordLength = UART_WORDLENGTH_8B; huart3.Init.StopBits = UART_STOPBITS_1; huart3.Init.Parity = UART_PARITY_NONE; huart3.Init.Mode = UART_MODE_TX_RX; huart3.Init.HwFlowCtl = UART_HWCONTROL_NONE; huart3.Init.OverSampling = UART_OVERSAMPLING_16; if (HAL_UART_Init(&huart3) != HAL_OK) { Error_Handler(); } / USER CODE BEGIN USART3_Init 2 / / USER CODE END USART3_Init 2 / } /** * @brief GPIO Initialization Function * @PAram None * @retval None */ static void MX_GPIO_Init(void) { GPIO_InitTypeDef GPIO_InitStruct = {0}; / USER CODE BEGIN MX_GPIO_Init_1 / / USER CODE END MX_GPIO_Init_1 / / GPIO Ports Clock Enable / __HAL_RCC_GPIOC_CLK_ENABLE(); __HAL_RCC_GPIOD_CLK_ENABLE(); __HAL_RCC_GPIOB_CLK_ENABLE(); __HAL_RCC_GPIOA_CLK_ENABLE(); /*Configure GPIO pin Output Level */ HAL_GPIO_WritePin(GPIOB, GPIO_PIN_13, GPIO_PIN_RESET); /*Configure GPIO pin Output Level */ HAL_GPIO_WritePin(GPIOA, GPIO_PIN_15, GPIO_PIN_RESET); /*Configure GPIO pin : PB13 */ GPIO_InitStruct.Pin = GPIO_PIN_13; GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP; GPIO_InitStruct.Pull = GPIO_NOPULL; GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW; HAL_GPIO_Init(GPIOB, &GPIO_InitStruct); /*Configure GPIO pin : PA15 */ GPIO_InitStruct.Pin = GPIO_PIN_15; GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP; GPIO_InitStruct.Pull = GPIO_NOPULL; GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW; HAL_GPIO_Init(GPIOA, &GPIO_InitStruct); / USER CODE BEGIN MX_GPIO_Init_2 / / USER CODE END MX_GPIO_Init_2 / } / USER CODE BEGIN 4 / / USER CODE END 4 / /** * @brief This function is executed in case of error occurrence. * @retval None */ void Error_Handler(void) { / USER CODE BEGIN Error_Handler_Debug / / User can add his own implementation to report the HAL error return state / __disable_irq(); while (1) { } / USER CODE END Error_Handler_Debug / } #ifdef USE_FULL_ASSERT /** * @brief Reports the name of the source file and the source line number * where the assert_param error has occurred. * @PAram file: pointer to the source file name * @PAram line: assert_param error line source number * @retval None */ void assert_failed(uint8_t *file, uint32_t line) { / USER CODE BEGIN 6 / /* User can add his own implementation to report the file name and line number, ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */ / USER CODE END 6 / } #endif / USE_FULL_ASSERT /

1 ACCEPTED SOLUTION

Accepted Solutions

We also try with LSE but clock not getting updated please reslove the issue.you can check below clock configurationScreenshot 2024-07-30 113026.png

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8 REPLIES 8
TDK
Guru

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example code

 

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/ USER CODE BEGIN Header /
/**
  ******************************************************************************
  * @file           : main.c
  * @brief          : Main program body
  ******************************************************************************
  * @attention
  *
  * Copyright (c) 2024 STMicroelectronics.
  * All rights reserved.
  *
  * This software is licensed under terms that can be found in the LICENSE file
  * in the root directory of this software component.
  * If no LICENSE file comes with this software, it is provided AS-IS.
  *
  ******************************************************************************
  */
/ USER CODE END Header /
/* Includes ------------------------------------------------------------------*/
#include "main.h"
 
/* Private includes ----------------------------------------------------------*/
/ USER CODE BEGIN Includes /
#include <stdio.h>
#include <string.h>
/ USER CODE END Includes /
 
/* Private typedef -----------------------------------------------------------*/
/ USER CODE BEGIN PTD /
/ USER CODE END PTD /
 
/* Private define ------------------------------------------------------------*/
/ USER CODE BEGIN PD /
 
/ USER CODE END PD /
 
/* Private macro -------------------------------------------------------------*/
/ USER CODE BEGIN PM /
 
/ USER CODE END PM /
 
/* Private variables ---------------------------------------------------------*/
RTC_HandleTypeDef hrtc;
 
UART_HandleTypeDef huart3;
char time[10];
char date[10];
RTC_TimeTypeDef RtcTime;
RTC_DateTypeDef RtcDate;
 
uint8_t CompareSeconds;
uint8_t CompareDate;
 
uint8_t Message[64];
uint8_t MessageLen;
uint8_t Messagexyz[64];
uint8_t MessageLenxyz;
 
/ USER CODE BEGIN PV /
 
void SetRTC(void);
void BackupDateToBR(void);
 
/ USER CODE END PV /
 
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_RTC_Init(void);
static void MX_USART3_UART_Init(void);
/ USER CODE BEGIN PFP /
extern uint32_t CalculateDayNumber(uint8_t Date, uint8_t Month, uint8_t Year); // DD.MM.YY
extern void CalculateDateFromDayNumber(uint32_t DayNumber, uint8_t Date, uint8_t Month, uint8_t *Year);
/ USER CODE END PFP /
 
/* Private user code ---------------------------------------------------------*/
/ USER CODE BEGIN 0 /
 
/ USER CODE BEGIN 1 /
uint32_t CalculateDayNumber(uint8_t Date, uint8_t Month, uint8_t Year)
{
// Format:
// DD.MM.YY
uint32_t _Year = Year + 20;
Month = (Month + 9) % 12;
Year = Year - (Month / 10);
return ((365  Year) + (Year / 4) - (Year / 100) + (Year / 400) + (((Month  306) + 5) / 10) + (Date - 1));
}
 
void CalculateDateFromDayNumber(uint32_t DayNumber, uint8_t Date, uint8_t Month, uint8_t *Year)
{
uint32_t Date, Month, _Year;
_Year = ((10000 * DayNumber) + 14780) / 3652425;
int32_t ddd = DayNumber - ((365 * Year) + (Year / 4) - (Year / 100) + (Year / 400));
if (ddd < 0)
{
_Year -= 1;
ddd = DayNumber - ((365 * Year) + (Year / 4) - (Year / 100) + (Year / 400));
}
int32_t mi = ((100 * ddd) + 52) / 3060;
_Month = (mi + 2) % 12 + 1;
Year = Year + (mi + 2)/12;
_Date = ddd - ((mi * 306) + 5)/10 + 1;
*Date = _Date;
*Month = _Month;
*Year = _Year - 20;
}
 
/ USER CODE END 0 /
 
/**
  * @brief  The application entry point.
  * @retval int
  */
int main(void)
{
  / USER CODE BEGIN 1 /
  / USER CODE END 1 /
 
  /* MCU Configuration--------------------------------------------------------*/
 
  / Reset of all peripherals, Initializes the Flash interface and the Systick. /
  HAL_Init();
 
  / USER CODE BEGIN Init /
  / USER CODE END Init /
 
  / Configure the system clock /
  SystemClock_Config();
 
  / USER CODE BEGIN SysInit /
  / USER CODE END SysInit /
 
  / Initialize all configured peripherals /
  MX_GPIO_Init();
  MX_RTC_Init();
  MX_USART3_UART_Init();
  / USER CODE BEGIN 2 /
 
 
 
  / USER CODE END 2 /
 
  / Infinite loop /
  / USER CODE BEGIN WHILE /
  HAL_GPIO_WritePin(GPIOA, GPIO_PIN_15, GPIO_PIN_SET);
  HAL_Delay(200);
  HAL_GPIO_WritePin(GPIOB, GPIO_PIN_13, GPIO_PIN_SET);
  HAL_Delay(200);
  HAL_GPIO_WritePin(GPIOA, GPIO_PIN_15, GPIO_PIN_RESET);
  HAL_Delay(2000);
 
  while (1)
  {
    / USER CODE END WHILE /
   HAL_RTC_GetTime(&hrtc, &RtcTime, RTC_FORMAT_BIN);
  HAL_RTC_GetDate(&hrtc, &RtcDate, RTC_FORMAT_BIN);
     HAL_UART_Transmit(&huart3, Messagexyz, MessageLenxyz, 100);
 
  if(RtcTime.Seconds != CompareSeconds)
  {
  MessageLen = sprintf((char*)Message, "Date: %02d.%02d.20%02d Time: %02d:%02d:%02d\n\r", RtcDate.Date, RtcDate.Month, RtcDate.Year, RtcTime.Hours, RtcTime.Minutes, RtcTime.Seconds);
  HAL_UART_Transmit(&huart3, Message, MessageLen, 100);
  CompareSeconds = RtcTime.Seconds;
  }
  if(RtcDate.Date != CompareDate)
  {
  BackupDateToBR();
  CompareDate = RtcDate.Date;
  }
 
  // if(GPIO_PIN_RESET == HAL_GPIO_ReadPin(TEST_GPIO_Port, TEST_Pin))
  // {
//  while(GPIO_PIN_RESET == HAL_GPIO_ReadPin(TEST_GPIO_Port, TEST_Pin))
//  {}
//  SetRTC();
  // }
    HAL_Delay(1000);
    / USER CODE BEGIN 3 /
  }
  / USER CODE END 3 /
}
 
/**
  * @brief System Clock Configuration
  * @retval None
  */
void SystemClock_Config(void)
{
  RCC_OscInitTypeDef RCC_OscInitStruct = {0};
  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
  RCC_PeriphCLKInitTypeDef PeriphClkInit = {0};
 
  /** Initializes the RCC Oscillators according to the specified parameters
  * in the RCC_OscInitTypeDef structure.
  */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI | RCC_OSCILLATORTYPE_LSI;
  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
  RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
  RCC_OscInitStruct.LSIState = RCC_LSI_ON;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI_DIV2;
  RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL2;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    Error_Handler();
  }
 
  /** Initializes the CPU, AHB and APB buses clocks
  */
  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK | 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_DIV2;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
 
  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0) != HAL_OK)
  {
    Error_Handler();
  }
 
  PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_RTC;
  PeriphClkInit.RTCClockSelection = RCC_RTCCLKSOURCE_LSI;
  if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK)
  {
    Error_Handler();
  }
}
 
/**
  * @brief RTC Initialization Function
  * @PAram None
  * @retval None
  */
// static void MX_RTC_Init(void)
// {
//   / USER CODE BEGIN RTC_Init 0 /
//   / USER CODE END RTC_Init 0 /
 
//   RTC_TimeTypeDef sTime = {0};
//   RTC_DateTypeDef DateToUpdate = {0};
 
//   / USER CODE BEGIN RTC_Init 1 /
//   / USER CODE END RTC_Init 1 /
 
//   /** Initialize RTC Only
//   */
//   hrtc.Instance = RTC;
//   hrtc.Init.AsynchPrediv = RTC_AUTO_1_SECOND;
//   hrtc.Init.OutPut = RTC_OUTPUTSOURCE_ALARM;
//   if (HAL_RTC_Init(&hrtc) != HAL_OK)
//   {
//     Error_Handler();
//   }
 
//   / USER CODE BEGIN Check_RTC_BKUP /
//   / USER CODE END Check_RTC_BKUP /
 
//   /** Initialize RTC and set the Time and Date
//   */
//   sTime.Hours = 0x03;
//   sTime.Minutes = 0x10;
//   sTime.Seconds = 0x30;
 
//   if (HAL_RTC_SetTime(&hrtc, &sTime, RTC_FORMAT_BCD) != HAL_OK)
//   {
//     Error_Handler();
//   }
//   DateToUpdate.WeekDay = RTC_WEEKDAY_SATURDAY;
//   DateToUpdate.Month = RTC_MONTH_JULY;
//   DateToUpdate.Date = 0x27;
//   DateToUpdate.Year = 0x24;
 
//   if (HAL_RTC_SetDate(&hrtc, &DateToUpdate, RTC_FORMAT_BCD) != HAL_OK)
//   {
//     Error_Handler();
//   }
//   / USER CODE BEGIN RTC_Init 2 /
//   / USER CODE END RTC_Init 2 /
// }
 
void MX_RTC_Init(void)
{
  RTC_TimeTypeDef sTime = {0};
  RTC_DateTypeDef DateToUpdate = {0};
 
  /** Initialize RTC Only 
  */
  hrtc.Instance = RTC;
  hrtc.Init.AsynchPrediv = RTC_AUTO_1_SECOND;
  hrtc.Init.OutPut = RTC_OUTPUTSOURCE_ALARM;
  if (HAL_RTC_Init(&hrtc) != HAL_OK)
  {
    Error_Handler();
  }
 
  / USER CODE BEGIN Check_RTC_BKUP /
 
  RTC_DateTypeDef BackupDate;
 
  RtcDate.Date = (HAL_RTCEx_BKUPRead(&hrtc, RTC_BKP_DR2) >> 8);
  RtcDate.Month = HAL_RTCEx_BKUPRead(&hrtc, RTC_BKP_DR2);
  RtcDate.Year = (HAL_RTCEx_BKUPRead(&hrtc, RTC_BKP_DR3) >> 8);
  RtcDate.WeekDay = HAL_RTCEx_BKUPRead(&hrtc, RTC_BKP_DR3);
 
  MessageLenxyz = sprintf((char*)Messagexyz, "Backup Date Value: %d, Month: %d, Year: %d, Weekday: %d\n\r", RtcDate.Date, RtcDate.Month, RtcDate.Year, RtcDate.WeekDay);
 
 
  HAL_RTC_GetTime(&hrtc, &RtcTime, RTC_FORMAT_BIN); // There is also an internal date update based on HW RTC time elapsed!!
  HAL_RTC_GetDate(&hrtc, &BackupDate, RTC_FORMAT_BIN); // Days elapsed since MCU power down
 
  uint32_t BackupDateDays = CalculateDayNumber(BackupDate.Date, BackupDate.Month, BackupDate.Year);
  uint32_t RtcDateDays = CalculateDayNumber(RtcDate.Date, RtcDate.Month, RtcDate.Year);
 
      // MessageLenxyz = sprintf((char*)Messagexyz, "BackupDateDays : %d RtcDateDays: %d\n\r", BackupDateDays,RtcDateDays);
 
 
  RtcDateDays += (BackupDateDays - CalculateDayNumber(1, 1, 0));
 
  CalculateDateFromDayNumber(RtcDateDays, &RtcDate.Date, &RtcDate.Month, &RtcDate.Year);
 
  HAL_RTC_SetDate(&hrtc, &RtcDate, RTC_FORMAT_BIN);
 
  //
  // You have to do not let Init code to reinitialize Time and Date in RTC.
  // It's "a bug" in HAL widely described and complain on forums.
  // That causes every MCU restart the time and date will be same as you configured in CubeMX.
  // All you have to do is just return before init time/date in this user section.
  //
    return;
  / USER CODE END Check_RTC_BKUP /
 
  /** Initialize RTC and set the Time and Date 
  */
  sTime.Hours = 23;
  sTime.Minutes = 59;
  sTime.Seconds = 55;
 
  if (HAL_RTC_SetTime(&hrtc, &sTime, RTC_FORMAT_BIN) != HAL_OK)
  {
    Error_Handler();
  }
  DateToUpdate.WeekDay = RTC_WEEKDAY_SATURDAY;
  DateToUpdate.Month = RTC_MONTH_FEBRUARY;
  DateToUpdate.Date = 3;
  DateToUpdate.Year = 20;
 
  if (HAL_RTC_SetDate(&hrtc, &DateToUpdate, RTC_FORMAT_BIN) != HAL_OK)
  {
    Error_Handler();
  }
 
}
 
/**
  * @brief USART3 Initialization Function
  * @PAram None
  * @retval None
  */
static void MX_USART3_UART_Init(void)
{
  / USER CODE BEGIN USART3_Init 0 /
  / USER CODE END USART3_Init 0 /
 
  / USER CODE BEGIN USART3_Init 1 /
  / USER CODE END USART3_Init 1 /
 
  huart3.Instance = USART3;
  huart3.Init.BaudRate = 115200;
  huart3.Init.WordLength = UART_WORDLENGTH_8B;
  huart3.Init.StopBits = UART_STOPBITS_1;
  huart3.Init.Parity = UART_PARITY_NONE;
  huart3.Init.Mode = UART_MODE_TX_RX;
  huart3.Init.HwFlowCtl = UART_HWCONTROL_NONE;
  huart3.Init.OverSampling = UART_OVERSAMPLING_16;
  if (HAL_UART_Init(&huart3) != HAL_OK)
  {
    Error_Handler();
  }
  / USER CODE BEGIN USART3_Init 2 /
  / USER CODE END USART3_Init 2 /
}
 
/**
  * @brief GPIO Initialization Function
  * @PAram None
  * @retval None
  */
static void MX_GPIO_Init(void)
{
  GPIO_InitTypeDef GPIO_InitStruct = {0};
 
  / GPIO Ports Clock Enable /
  __HAL_RCC_GPIOC_CLK_ENABLE();
  __HAL_RCC_GPIOD_CLK_ENABLE();
  __HAL_RCC_GPIOA_CLK_ENABLE();
  __HAL_RCC_GPIOB_CLK_ENABLE();
 
  /*Configure GPIO pin Output Level */
  HAL_GPIO_WritePin(GPIOA, GPIO_PIN_15, GPIO_PIN_RESET);
 
  /*Configure GPIO pin Output Level */
  HAL_GPIO_WritePin(GPIOB, GPIO_PIN_13, GPIO_PIN_RESET);
 
  /*Configure GPIO pin : PA15 */
  GPIO_InitStruct.Pin = GPIO_PIN_15;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
 
  /*Configure GPIO pin : PB13 */
  GPIO_InitStruct.Pin = GPIO_PIN_13;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
}
 
/ USER CODE BEGIN 4 /
void BackupDateToBR(void)
{
HAL_RTCEx_BKUPWrite(&hrtc, RTC_BKP_DR2, ((RtcDate.Date << | (RtcDate.Month)));
HAL_RTCEx_BKUPWrite(&hrtc, RTC_BKP_DR3, ((RtcDate.Year << | (RtcDate.WeekDay)));
  
}
 
void SetRTC(void)
{
RTC_TimeTypeDef sTime = {0};
RTC_DateTypeDef DateToUpdate = {0};
 
/** Initialize RTC and set the Time and Date
*/
sTime.Hours = 23;
sTime.Minutes = 59;
sTime.Seconds = 56;
 
if (HAL_RTC_SetTime(&hrtc, &sTime, RTC_FORMAT_BIN) != HAL_OK)
{
  Error_Handler();
}
 
DateToUpdate.WeekDay = RTC_WEEKDAY_SATURDAY;
DateToUpdate.Month = RTC_MONTH_FEBRUARY;
DateToUpdate.Date = 3;
DateToUpdate.Year = 20;
 
if (HAL_RTC_SetDate(&hrtc, &DateToUpdate, RTC_FORMAT_BIN) != HAL_OK)
{
  Error_Handler();
}
 
BackupDateToBR();
}
/ USER CODE END 4 /
 
/**
  * @brief  This function is executed in case of error occurrence.
  * @retval None
  */
void Error_Handler(void)
{
  __disable_irq();
  while (1)
  {
  }
}
 
#ifdef  USE_FULL_ASSERT
/**
  * @brief  Reports the name of the source file and the source line number
  *         where the assert_param error has occurred.
  * @PAram  file: pointer to the source file name
  * @PAram  line: assert_param error line source number
  * @retval None
  */
void assert_failed(uint8_t *file, uint32_t line)
  / USER CODE BEGIN 6 /
  /* User can add his own implementation to report the file name and line number,
     ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
  / USER CODE END 6 /
}
#endif / USE_FULL_ASSERT /

 

LSI does not work if power is down.

To maintain real time, you must use LSE.

JW

We also try with LSE but clock not getting updated please reslove the issue.you can check below clock configurationScreenshot 2024-07-30 113026.png

> We also try with LSE but clock not getting updated 

Does clock update during runtime?

If no, LSE simply does not run at all.

If yes, LSE may be marginal.

Read AN2867 and follow recommendations.

JW

we are getting the oscillator voltage  as 1.2V in LSE external voltage and VBAT as 3.3V. Is this OK for the oscillator working properly or there is any specific voltage?

 

You can't judge whether LSE works or not by measuring its voltage by a multimeter.

It's an ultralow power oscillator and unless you measure it using a specialized low capacitance probe on oscilloscope, you are likely to influence it by the measurement.

Besides AN2867, review the many threads discussing similar problems here (including the thread you've already contributed to), and follow the recommendations therein.

JW

Thankyou Waclawek for the reply. Meanwhile we verify the hardware can you please let us know whether the code used for RTC Initialization and backup method is correct and sufficient. Please help me with this. Thankyou

 

 

 

/* USER CODE BEGIN Header */
#include "stdio.h"
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"

/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
/* USER CODE END Includes */

/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
/* USER CODE END PTD */

/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
/* USER CODE END PD */

/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */
/* USER CODE END PM */

/* Private variables ---------------------------------------------------------*/
RTC_HandleTypeDef hrtc;

UART_HandleTypeDef huart3;

/* USER CODE BEGIN PV */
char time[10];
char date[10];
RTC_TimeTypeDef RtcTime;
RTC_DateTypeDef RtcDate;
 
uint8_t CompareSeconds;
uint8_t CompareDate;
 
uint8_t Message[64];
uint8_t MessageLen;
uint8_t Messagexyz[64];
uint8_t MessageLenxyz;
/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_RTC_Init(void);
static void MX_USART3_UART_Init(void);
void BackupDateToBR(void);
extern uint32_t CalculateDayNumber(uint8_t , uint8_t , uint8_t ); // DD.MM.YY
extern void CalculateDateFromDayNumber(uint32_t , uint8_t *, uint8_t *, uint8_t *);
/* USER CODE BEGIN PFP */
/* USER CODE END PFP */

/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
uint32_t CalculateDayNumber(uint8_t Date, uint8_t Month, uint8_t Year)
{
	// Format:
	// DD.MM.YY
	uint32_t _Year = Year + 20;
	Month = (Month + 9) % 12;
	_Year = _Year - (Month / 10);
	return ((365 * _Year) + (_Year / 4) - (_Year / 100) + (_Year / 400) + (((Month * 306) + 5) / 10) + (Date - 1));
}

void CalculateDateFromDayNumber(uint32_t DayNumber, uint8_t *Date, uint8_t *Month, uint8_t *Year)
{
	uint32_t _Date, _Month, _Year;
	_Year = ((10000 * DayNumber) + 14780) / 3652425;
	int32_t ddd = DayNumber - ((365 * _Year) + (_Year / 4) - (_Year / 100) + (_Year / 400));
	if (ddd < 0)
	{
		_Year -= 1;
		ddd = DayNumber - ((365 * _Year) + (_Year / 4) - (_Year / 100) + (_Year / 400));
	}
	int32_t mi = ((100 * ddd) + 52) / 3060;
	_Month = (mi + 2) % 12 + 1;
	_Year = _Year + (mi + 2)/12;
	_Date = ddd - ((mi * 306) + 5)/10 + 1;
	*Date = _Date;
	*Month = _Month;
	*Year = _Year - 20;
}

/* USER CODE END 0 */

/**
  * @brief  The application entry point.
  * @retval int
  */
int main(void)
{

  /* USER CODE BEGIN 1 */
  /* USER CODE END 1 */

  /* MCU Configuration--------------------------------------------------------*/

  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
  HAL_Init();

  /* USER CODE BEGIN Init */
  /* USER CODE END Init */

  /* Configure the system clock */
  SystemClock_Config();

  /* USER CODE BEGIN SysInit */
  /* USER CODE END SysInit */

  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_RTC_Init();
  MX_USART3_UART_Init();
  /* USER CODE BEGIN 2 */
  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
	HAL_GPIO_WritePin(GPIOA, GPIO_PIN_15, GPIO_PIN_SET);
  HAL_Delay(200);
  HAL_GPIO_WritePin(GPIOB, GPIO_PIN_13, GPIO_PIN_SET);
  HAL_Delay(200);
  HAL_GPIO_WritePin(GPIOA, GPIO_PIN_15, GPIO_PIN_RESET);
  HAL_Delay(2000);
	while(1)
	{
     HAL_RTC_GetTime(&hrtc, &RtcTime, RTC_FORMAT_BIN);
	  HAL_RTC_GetDate(&hrtc, &RtcDate, RTC_FORMAT_BIN);

	  if(RtcTime.Seconds != CompareSeconds)
	  {
		  MessageLen = sprintf((char*)Message, "Date: %02d.%02d.20%02d Time: %02d:%02d:%02d\n\r", RtcDate.Date, RtcDate.Month, RtcDate.Year, RtcTime.Hours, RtcTime.Minutes, RtcTime.Seconds);
		  HAL_UART_Transmit(&huart3, Message, MessageLen, 100);
		  CompareSeconds = RtcTime.Seconds;
	  }
	  if(RtcDate.Date != CompareDate)
	  {
		  BackupDateToBR();
		  CompareDate = RtcDate.Date;
	  }
		
	}
    /* USER CODE END WHILE */

    /* USER CODE BEGIN 3 */
  /* USER CODE END 3 */
}

/**
  * @brief System Clock Configuration
  * @retval None
  */
void SystemClock_Config(void)
{
  RCC_OscInitTypeDef RCC_OscInitStruct = {0};
  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
  RCC_PeriphCLKInitTypeDef PeriphClkInit = {0};

  /** Initializes the RCC Oscillators according to the specified parameters
  * in the RCC_OscInitTypeDef structure.
  */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI|RCC_OSCILLATORTYPE_LSE;
  RCC_OscInitStruct.LSEState = RCC_LSE_ON;
  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
  RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI_DIV2;
  RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL9;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    Error_Handler();
  }

  /** Initializes the CPU, AHB and APB buses clocks
  */
  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|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_DIV2;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;

  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1) != HAL_OK)
  {
    Error_Handler();
  }
  PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_RTC;
  PeriphClkInit.RTCClockSelection = RCC_RTCCLKSOURCE_LSE;
  if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK)
  {
    Error_Handler();
  }
}

/**
  * @brief RTC Initialization Function
  *  None
  * @retval None
  */
static void MX_RTC_Init(void)
{

  /* USER CODE BEGIN RTC_Init 0 */
  /* USER CODE END RTC_Init 0 */

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

  /* USER CODE BEGIN RTC_Init 1 */
  /* USER CODE END RTC_Init 1 */

  /** Initialize RTC Only
  */
  hrtc.Instance = RTC;
  hrtc.Init.AsynchPrediv = RTC_AUTO_1_SECOND;
  hrtc.Init.OutPut = RTC_OUTPUTSOURCE_ALARM;
  if (HAL_RTC_Init(&hrtc) != HAL_OK)
  {
    Error_Handler();
  }

  /* USER CODE BEGIN Check_RTC_BKUP */

  RTC_DateTypeDef BackupDate;
 
  RtcDate.Date = (HAL_RTCEx_BKUPRead(&hrtc, RTC_BKP_DR2) >> 8);
  RtcDate.Month = HAL_RTCEx_BKUPRead(&hrtc, RTC_BKP_DR2);
  RtcDate.Year = (HAL_RTCEx_BKUPRead(&hrtc, RTC_BKP_DR3) >> 8);
  RtcDate.WeekDay = HAL_RTCEx_BKUPRead(&hrtc, RTC_BKP_DR3);
 
  MessageLenxyz = sprintf((char*)Messagexyz, "Backup Date Value: %d, Month: %d, Year: %d, Weekday: %d\n\r", RtcDate.Date, RtcDate.Month, RtcDate.Year, RtcDate.WeekDay);
 
 
  HAL_RTC_GetTime(&hrtc, &RtcTime, RTC_FORMAT_BIN); // There is also an internal date update based on HW RTC time elapsed!!
  HAL_RTC_GetDate(&hrtc, &BackupDate, RTC_FORMAT_BIN); // Days elapsed since MCU power down
 
  uint32_t BackupDateDays = CalculateDayNumber(BackupDate.Date, BackupDate.Month, BackupDate.Year);
  uint32_t RtcDateDays = CalculateDayNumber(RtcDate.Date, RtcDate.Month, RtcDate.Year);
 
      // MessageLenxyz = sprintf((char*)Messagexyz, "BackupDateDays : %d RtcDateDays: %d\n\r", BackupDateDays,RtcDateDays);
 
 
  RtcDateDays += (BackupDateDays - CalculateDayNumber(1, 1, 0));
 
  CalculateDateFromDayNumber(RtcDateDays, &RtcDate.Date, &RtcDate.Month, &RtcDate.Year);
 
  HAL_RTC_SetDate(&hrtc, &RtcDate, RTC_FORMAT_BIN);
    return;
  /* USER CODE END Check_RTC_BKUP */

  /** Initialize RTC and set the Time and Date
  */
  sTime.Hours = 0x10;
  sTime.Minutes = 0x10;
  sTime.Seconds = 0x30;

  if (HAL_RTC_SetTime(&hrtc, &sTime, RTC_FORMAT_BCD) != HAL_OK)
  {
    Error_Handler();
  }
  DateToUpdate.WeekDay = RTC_WEEKDAY_SATURDAY;
  DateToUpdate.Month = RTC_MONTH_JULY;
  DateToUpdate.Date = 0x27;
  DateToUpdate.Year = 0x24;

  if (HAL_RTC_SetDate(&hrtc, &DateToUpdate, RTC_FORMAT_BCD) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN RTC_Init 2 */
  /* USER CODE END RTC_Init 2 */

}

/**
  * @brief USART3 Initialization Function
  *  None
  * @retval None
  */
static void MX_USART3_UART_Init(void)
{

  /* USER CODE BEGIN USART3_Init 0 */
  /* USER CODE END USART3_Init 0 */

  /* USER CODE BEGIN USART3_Init 1 */
  /* USER CODE END USART3_Init 1 */
  huart3.Instance = USART3;
  huart3.Init.BaudRate = 115200;
  huart3.Init.WordLength = UART_WORDLENGTH_8B;
  huart3.Init.StopBits = UART_STOPBITS_1;
  huart3.Init.Parity = UART_PARITY_NONE;
  huart3.Init.Mode = UART_MODE_TX_RX;
  huart3.Init.HwFlowCtl = UART_HWCONTROL_NONE;
  huart3.Init.OverSampling = UART_OVERSAMPLING_16;
  if (HAL_UART_Init(&huart3) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN USART3_Init 2 */
  /* USER CODE END USART3_Init 2 */

}

/**
  * @brief GPIO Initialization Function
  *  None
  * @retval None
  */
static void MX_GPIO_Init(void)
{
  GPIO_InitTypeDef GPIO_InitStruct = {0};
/* USER CODE BEGIN MX_GPIO_Init_1 */
/* USER CODE END MX_GPIO_Init_1 */

  /* GPIO Ports Clock Enable */
  __HAL_RCC_GPIOC_CLK_ENABLE();
  __HAL_RCC_GPIOD_CLK_ENABLE();
  __HAL_RCC_GPIOB_CLK_ENABLE();
  __HAL_RCC_GPIOA_CLK_ENABLE();

  /*Configure GPIO pin Output Level */
  HAL_GPIO_WritePin(GPIOB, GPIO_PIN_13, GPIO_PIN_RESET);

  /*Configure GPIO pin Output Level */
  HAL_GPIO_WritePin(GPIOA, GPIO_PIN_15, GPIO_PIN_RESET);

  /*Configure GPIO pin : PB13 */
  GPIO_InitStruct.Pin = GPIO_PIN_13;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

  /*Configure GPIO pin : PA15 */
  GPIO_InitStruct.Pin = GPIO_PIN_15;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

/* USER CODE BEGIN MX_GPIO_Init_2 */
/* USER CODE END MX_GPIO_Init_2 */
}

/* USER CODE BEGIN 4 */
void BackupDateToBR(void)
{
	HAL_RTCEx_BKUPWrite(&hrtc, RTC_BKP_DR2, ((RtcDate.Date <<  | (RtcDate.Month)));
	HAL_RTCEx_BKUPWrite(&hrtc, RTC_BKP_DR3, ((RtcDate.Year <<  | (RtcDate.WeekDay)));
}
/* USER CODE END 4 */

/**
  * @brief  This function is executed in case of error occurrence.
  * @retval None
  */
void Error_Handler(void)
{
  /* USER CODE BEGIN Error_Handler_Debug */
  /* USER CODE END Error_Handler_Debug */
}

#ifdef  USE_FULL_ASSERT
/**
  * @brief  Reports the name of the source file and the source line number
  *         where the assert_param error has occurred.
  *   file: pointer to the source file name
  *   line: assert_param error line source number
  * @retval None
  */
void assert_failed(uint8_t *file, uint32_t line)
{
  /* USER CODE BEGIN 6 */
  /* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */

 

Ajay_9121_0-1722504559814.png