OnBoard RTC auf dem STM32F411E Discovery

/**

  ******************************************************************************

  * File Name          : main.c

  * Description        : Main program body

  **********************************************************************************************************************************************************

  */

/* Includes ------------------------------------------------------------------*/

#include "main.h"

#include "stm32f4xx_hal.h"

#include "stm32f4xx_hal_uart.h"

/* Private variables ---------------------------------------------------------*/

RTC_HandleTypeDef hrtc;

UART_HandleTypeDef huart2;

void SystemClock_Config(void);

static void MX_GPIO_Init(void);

static void MX_RTC_Init(void);

//static void MX_USART2_UART_Init(void);

static void MX_USART2_UART_Init(void)

{

  huart2.Instance = USART2;

  huart2.Init.BaudRate = 9600;

  huart2.Init.WordLength = UART_WORDLENGTH_8B;

  huart2.Init.StopBits = UART_STOPBITS_1;

  huart2.Init.Parity = UART_PARITY_NONE;

  huart2.Init.Mode = UART_MODE_TX_RX;

  huart2.Init.HwFlowCtl = UART_HWCONTROL_NONE;

  huart2.Init.OverSampling = UART_OVERSAMPLING_16;

  if (HAL_UART_Init(&huart2) != HAL_OK)

  {

    _Error_Handler(__FILE__, __LINE__);

  }

}

int main(void)

{

  RTC_TimeTypeDef st_time;

  uint8_t sec=0;

  HAL_Init();

  SystemClock_Config();

  /*Initialise USART2*/

  MX_GPIO_Init();

  HAL_UART_MspInit(&huart2);

  MX_USART2_UART_Init();

  /*Initialise RTC*/

  MX_RTC_Init();

  HAL_RTC_MspInit(&hrtc);

  HAL_RTC_Init(&hrtc);   

  while (1)

  {

      HAL_RTC_GetTime(&hrtc, &st_time, RTC_FORMAT_BCD);

      HAL_Delay(5);

      sec=st_time.Seconds;

      HAL_UART_Transmit(&huart2 ,&sec , 1,100);

      HAL_Delay(400);

  }

}

/** System Clock Configuration

*/

void SystemClock_Config(void)

{

  RCC_OscInitTypeDef RCC_OscInitStruct;

  RCC_ClkInitTypeDef RCC_ClkInitStruct;

  RCC_PeriphCLKInitTypeDef PeriphClkInitStruct;

    /**Configure the main internal regulator output voltage 

    */

  __HAL_RCC_PWR_CLK_ENABLE();

  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);

    /**Initializes the CPU, AHB and APB busses clocks 

    */

  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI|RCC_OSCILLATORTYPE_LSI;

  RCC_OscInitStruct.HSIState = RCC_HSI_ON;

  RCC_OscInitStruct.HSICalibrationValue = 16;

  RCC_OscInitStruct.LSIState = RCC_LSI_ON;

  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;

  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;

  RCC_OscInitStruct.PLL.PLLM = 8;

  RCC_OscInitStruct.PLL.PLLN = 192;

  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV4;

  RCC_OscInitStruct.PLL.PLLQ = 8;

  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)

  {

    _Error_Handler(__FILE__, __LINE__);

  }

    /**Initializes the CPU, AHB and APB busses 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_DIV4;

  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;

  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_3) != HAL_OK)

  {

    _Error_Handler(__FILE__, __LINE__);

  }

  PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_RTC;

  PeriphClkInitStruct.RTCClockSelection = RCC_RTCCLKSOURCE_LSI;

  if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct) != HAL_OK)

  {

    _Error_Handler(__FILE__, __LINE__);

  }

    /**Configure the Systick interrupt time 

    */

  HAL_SYSTICK_Config(HAL_RCC_GetHCLKFreq()/1000);

    /**Configure the Systick 

    */

  HAL_SYSTICK_CLKSourceConfig(SYSTICK_CLKSOURCE_HCLK);

  /* SysTick_IRQn interrupt configuration */

  HAL_NVIC_SetPriority(SysTick_IRQn, 0, 0);

}

/* RTC init function */

static void MX_RTC_Init(void)

{

  RTC_TimeTypeDef sTime;

  RTC_DateTypeDef sDate;

    /**Initialize RTC Only 

    */

  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;

  if (HAL_RTC_Init(&hrtc) != HAL_OK)

  {

    _Error_Handler(__FILE__, __LINE__);

  }

    /**Initialize RTC and set the Time and Date 

    */

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

  sTime.Hours = 0x1;

  sTime.Minutes = 0x0;

  sTime.Seconds = 0x0;

  sTime.TimeFormat = RTC_HOURFORMAT12_AM;

  sTime.DayLightSaving = RTC_DAYLIGHTSAVING_NONE;

  sTime.StoreOperation = RTC_STOREOPERATION_RESET;

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

  {

    _Error_Handler(__FILE__, __LINE__);

  }

  sDate.WeekDay = RTC_WEEKDAY_MONDAY;

  sDate.Month = RTC_MONTH_JANUARY;

  sDate.Date = 0x1;

  sDate.Year = 0x4;

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

  {

    _Error_Handler(__FILE__, __LINE__);

  }

    HAL_RTCEx_BKUPWrite(&hrtc,RTC_BKP_DR0,0x32F2);

  }

}

/** Configure pins as 

        * Analog 

        * Input 

        * Output

        * EVENT_OUT

        * EXTI

*/

static void MX_GPIO_Init(void)

{

  /* GPIO Ports Clock Enable */

  __HAL_RCC_GPIOA_CLK_ENABLE();

}

void _Error_Handler(char * file, int line)

{

  while(1) 

  {

  }

}

#ifdef USE_FULL_ASSERT

void assert_failed(uint8_t* file, uint32_t line)

{

}