【STM32H7S78-DK测评】RTC日期与时间设置

RTC是非常实用的时间，日期功能模块，STM32H7S78-DK提供RTC功能，在使能RTC模块的同时，也使能UART串口打印功能，方便后期展示RTC数据。



在图形化配置界面：





点击保存，检查生成的代码：

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static void MX_UART4_Init(void)

{



  /* USER CODE BEGIN UART4_Init 0 */



  /* USER CODE END UART4_Init 0 */



  /* USER CODE BEGIN UART4_Init 1 */



  /* USER CODE END UART4_Init 1 */

  huart4.Instance = UART4;

  huart4.Init.BaudRate = 115200;

  huart4.Init.WordLength = UART_WORDLENGTH_8B;

  huart4.Init.StopBits = UART_STOPBITS_1;

  huart4.Init.Parity = UART_PARITY_NONE;

  huart4.Init.Mode = UART_MODE_TX_RX;

  huart4.Init.HwFlowCtl = UART_HWCONTROL_NONE;

  huart4.Init.OverSampling = UART_OVERSAMPLING_16;

  huart4.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;

  huart4.Init.ClockPrescaler = UART_PRESCALER_DIV1;

  huart4.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;

  if (HAL_UART_Init(&huart4) != HAL_OK)

  {

    Error_Handler();

  }

  if (HAL_UARTEx_SetTxFifoThreshold(&huart4, UART_TXFIFO_THRESHOLD_1_8) != HAL_OK)

  {

    Error_Handler();

  }

  if (HAL_UARTEx_SetRxFifoThreshold(&huart4, UART_RXFIFO_THRESHOLD_1_8) != HAL_OK)

  {

    Error_Handler();

  }

  if (HAL_UARTEx_DisableFifoMode(&huart4) != HAL_OK)

  {

    Error_Handler();

  }

  /* USER CODE BEGIN UART4_Init 2 */



  /* USER CODE END UART4_Init 2 */



}

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static void MX_RTC_Init(void)

{



  /* USER CODE BEGIN RTC_Init 0 */



  /* USER CODE END RTC_Init 0 */



  RTC_PrivilegeStateTypeDef privilegeState = {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 = RTC_ASYNCH_PREDIV;

  hrtc.Init.SynchPrediv = RTC_SYNCH_PREDIV;

  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;

  hrtc.Init.BinMode = RTC_BINARY_NONE;

  if (HAL_RTC_Init(&hrtc) != HAL_OK)

  {

    Error_Handler();

  }

  privilegeState.rtcPrivilegeFull = RTC_PRIVILEGE_FULL_NO;

  privilegeState.backupRegisterPrivZone = RTC_PRIVILEGE_BKUP_ZONE_NONE;

  privilegeState.backupRegisterStartZone2 = RTC_BKP_DR0;

  privilegeState.backupRegisterStartZone3 = RTC_BKP_DR0;

  if (HAL_RTCEx_PrivilegeModeSet(&hrtc, &privilegeState) != HAL_OK)

  {

    Error_Handler();

  }



  /* USER CODE BEGIN Check_RTC_BKUP */



  /* Set Date and Time (if not already done before)*/

  /* Read the Back Up Register 0 Data */

  if (HAL_RTCEx_BKUPRead(&hrtc, RTC_BKP_DR0) != 0x32F2)

  {

    /* Configure RTC Calendar */

  /* USER CODE END Check_RTC_BKUP */



  /** Initialize RTC and set the Time and Date

  */

  sTime.Hours = 0x2;

  sTime.Minutes = 0x0;

  sTime.Seconds = 0x0;

  sTime.DayLightSaving = RTC_DAYLIGHTSAVING_NONE;

  sTime.StoreOperation = RTC_STOREOPERATION_RESET;

  if (HAL_RTC_SetTime(&hrtc, &sTime, RTC_FORMAT_BCD) != HAL_OK)

  {

    Error_Handler();

  }

  sDate.WeekDay = RTC_WEEKDAY_WEDNESDAY;

  sDate.Month = RTC_MONTH_NOVEMBER;

  sDate.Date = 0x8;

  sDate.Year = 0x0;



  if (HAL_RTC_SetDate(&hrtc, &sDate, RTC_FORMAT_BCD) != HAL_OK)

  {

    Error_Handler();

  }

  /* USER CODE BEGIN RTC_Init 2 */



  /* Writes a data in a RTC Backup data Register0 */

  HAL_RTCEx_BKUPWrite(&hrtc, RTC_BKP_DR0, 0x32F2);

  }

  else

  {

    /* Check if the Power On Reset flag is set */

    if (__HAL_RCC_GET_FLAG(RCC_FLAG_BORRST) != RESET)

    {

      /* Turn on LD2: Power on reset occurred */

      BSP_LED_On(LD2);

    }



    /* Check if Pin Reset flag is set */

    if (__HAL_RCC_GET_FLAG(RCC_FLAG_PINRST) != RESET)

    {

      /* Turn on LD2: External reset occurred */

      BSP_LED_On(LD2);

    }

  }

  /* Clear source Reset Flag */

  __HAL_RCC_CLEAR_RESET_FLAGS();



  /* USER CODE END RTC_Init 2 */



}

重定向printf

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#ifdef __GNUC__

#define PUTCHAR_PROTOTYPE int __io_putchar(int ch)

#else

#define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f)

#endif



PUTCHAR_PROTOTYPE

{

  HAL_UART_Transmit(&huart4, (uint8_t *)&ch, 1, HAL_MAX_DELAY);

  return ch;

}

接下来打印日期与时间：

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/**

  * [url=home.php?mod=space&uid=247401]@brief[/url]  Display the current time and date.

  * @param  showtime : pointer to buffer

  * @param  showdate : pointer to buffer

  * @retval None

  */

static void RTC_CalendarShow(uint8_t *showtime, uint8_t *showdate)

{

  RTC_DateTypeDef sdatestructureget;

  RTC_TimeTypeDef stimestructureget;



  /* Get the RTC current Time */

  HAL_RTC_GetTime(&hrtc, &stimestructureget, RTC_FORMAT_BIN);

  /* Get the RTC current Date */

  HAL_RTC_GetDate(&hrtc, &sdatestructureget, RTC_FORMAT_BIN);

  /* Display time Format : hh:mm:ss */

  sprintf((char *)showtime, "%2d:%2d:%2d", stimestructureget.Hours, stimestructureget.Minutes, stimestructureget.Seconds);

  /* Display date Format : mm-dd-yyyy */

  sprintf((char *)showdate, "%2d-%2d-%2d", sdatestructureget.Month, sdatestructureget.Date, 2000 + sdatestructureget.Year);



  printf("\r\n%s", showtime);

  printf("\r\n%s", showdate);

}

展示：

不知道有没有备份电源

rtc的误差多少？24小时能差1秒不