text: /**
    ******************************************************************************
    * @file    RTC/RTC_Alarm/Src/main.c 
    * @author  MCD Application Team
    * @version V1.0.4
    * @date    06-May-2016
    * @brief   This sample code shows how to use STM32F4xx RTC HAL API to configure 
    *          Time and Date.
    ******************************************************************************
    * @attention
    *
    * <h2><center>&copy; COPYRIGHT(c) 2016 STMicroelectronics</center></h2>
    *
    * Redistribution and use in source and binary forms, with or without modification,
    * are permitted provided that the following conditions are met:
    *   1. Redistributions of source code must retain the above copyright notice,
    *      this list of conditions and the following disclaimer.
    *   2. Redistributions in binary form must reproduce the above copyright notice,
    *      this list of conditions and the following disclaimer in the documentation
    *      and/or other materials provided with the distribution.
    *   3. Neither the name of STMicroelectronics nor the names of its contributors
    *      may be used to endorse or promote products derived from this software
    *      without specific prior written permission.
    *
    * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
    * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
    * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
    * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
    * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
    * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
    * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
    * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
    * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
    *
    ******************************************************************************
    */
  
  /* Includes ------------------------------------------------------------------*/
  #include "main.h"
  
  /** @addtogroup STM32F4xx_HAL_Examples
    * @{
    */
  
  /** @addtogroup RTC_Alarm
    * @{
    */
  
  /* Private typedef -----------------------------------------------------------*/
  /* Private define ------------------------------------------------------------*/
  /* Private macro -------------------------------------------------------------*/
  /* Private variables ---------------------------------------------------------*/
  /* RTC handler declaration */
  RTC_HandleTypeDef RtcHandle;
  
  /* Buffer used for displaying Time */
  uint8_t aShowTime[50] = {0};
  
  /* Private function prototypes -----------------------------------------------*/
  static void SystemClock_Config(void);
  static void RTC_AlarmConfig(void);
  static void RTC_TimeShow(uint8_t* showtime);
  
  /* Private functions ---------------------------------------------------------*/
  
  /**
    * @brief  Main program
    * @param  None
    * @retval None
    */
  int main(void)
  {  
    /* STM32F4xx HAL library initialization:
         - Configure the Flash prefetch
         - Systick timer is configured by default as source of time base, but user 
           can eventually implement his proper time base source (a general purpose 
           timer for example or other time source), keeping in mind that Time base 
           duration should be kept 1ms since PPP_TIMEOUT_VALUEs are defined and 
           handled in milliseconds basis.
         - Set NVIC Group Priority to 4
         - Low Level Initialization: global MSP (MCU Support Package) initialization
       */
    HAL_Init();
  
    /* Configure the system clock to 180 MHz */
    SystemClock_Config();
    
    /* Since MFX is used, LED init is done after clock config */
    /* Configure LED1 and LED3 */
    BSP_LED_Init(LED1);
    BSP_LED_Init(LED3);
  
    /*##-1- Configure the RTC peripheral #######################################*/
    RtcHandle.Instance = RTC;
  
    /* Configure RTC prescaler and RTC data registers */
    /* RTC configured as follows:
        - Hour Format    = Format 24
        - Asynch Prediv  = Value according to source clock
        - Synch Prediv   = Value according to source clock
        - OutPut         = Output Disable
        - OutPutPolarity = High Polarity
        - OutPutType     = Open Drain */
    RtcHandle.Init.HourFormat     = RTC_HOURFORMAT_24;
    RtcHandle.Init.AsynchPrediv   = RTC_ASYNCH_PREDIV;
    RtcHandle.Init.SynchPrediv    = RTC_SYNCH_PREDIV;
    RtcHandle.Init.OutPut         = RTC_OUTPUT_DISABLE;
    RtcHandle.Init.OutPutPolarity = RTC_OUTPUT_POLARITY_HIGH;
    RtcHandle.Init.OutPutType     = RTC_OUTPUT_TYPE_OPENDRAIN;
    if (HAL_RTC_Init(&RtcHandle) != HAL_OK)
    {
      /* Initialization Error */
      Error_Handler();
    }
  
    /*##-2- Configure Alarm ####################################################*/
    /* Configure RTC Alarm */
    RTC_AlarmConfig();
    
    /* Infinite loop */  
    while (1)
    {
      /*##-3- Display the updated Time #########################################*/
      RTC_TimeShow(aShowTime);
    }
  }
  
  /**
    * @brief  Alarm callback
    * @param  hrtc : RTC handle
    * @retval None
    */
  void HAL_RTC_AlarmAEventCallback(RTC_HandleTypeDef *hrtc)
  {
    /* Turn LED1 on: Alarm generation */
    BSP_LED_On(LED1);
  }
  
  /**
    * @brief  System Clock Configuration
    *         The system Clock is configured as follow : 
    *            System Clock source            = PLL (HSE)
    *            SYSCLK(Hz)                     = 180000000
    *            HCLK(Hz)                       = 180000000
    *            AHB Prescaler                  = 1
    *            APB1 Prescaler                 = 4
    *            APB2 Prescaler                 = 2
    *            HSE Frequency(Hz)              = 25000000
    *            PLL_M                          = 25
    *            PLL_N                          = 360
    *            PLL_P                          = 2
    *            PLL_Q                          = 7
    *            PLL_R                          = 6
    *            VDD(V)                         = 3.3
    *            Main regulator output voltage  = Scale1 mode
    *            Flash Latency(WS)              = 5
    * @param  None
    * @retval None
    */
  static void SystemClock_Config(void)
  {
    RCC_ClkInitTypeDef RCC_ClkInitStruct;
    RCC_OscInitTypeDef RCC_OscInitStruct;
    HAL_StatusTypeDef ret = HAL_OK;
  
    /* Enable Power Control clock */
    __HAL_RCC_PWR_CLK_ENABLE();
  
    /* The voltage scaling allows optimizing the power consumption when the device is 
       clocked below the maximum system frequency, to update the voltage scaling value 
       regarding system frequency refer to product datasheet.  */
    __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
  
    /* Enable HSE Oscillator and activate PLL with HSE as source */
    RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
    RCC_OscInitStruct.HSEState = RCC_HSE_ON;
    RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
    RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
    RCC_OscInitStruct.PLL.PLLM = 25;
    RCC_OscInitStruct.PLL.PLLN = 360;
    RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
    RCC_OscInitStruct.PLL.PLLQ = 7;
    RCC_OscInitStruct.PLL.PLLR = 6;
    
    ret = HAL_RCC_OscConfig(&RCC_OscInitStruct);
    if(ret != HAL_OK)
    {
      while(1) { ; }
    }
    
    /* Activate the OverDrive to reach the 180 MHz Frequency */  
    ret = HAL_PWREx_EnableOverDrive();
    if(ret != HAL_OK)
    {
      while(1) { ; }
    }
    
    /* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2 clocks dividers */
    RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | 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;  
    
    ret = HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5);
    if(ret != HAL_OK)
    {
      while(1) { ; }
    }
  }
  
  /**
    * @brief  This function is executed in case of error occurrence.
    * @param  None
    * @retval None
    */
  void Error_Handler(void)
  {
    while (1)
    {
      /* Toggle LED3 with a period of one second */
      BSP_LED_Toggle(LED3);
      HAL_Delay(1000);
    }
  }
  
  /**
    * @brief  Configure the current time and date.
    * @param  None
    * @retval None
    */
  static void RTC_AlarmConfig(void)
  {
    RTC_DateTypeDef  sdatestructure;
    RTC_TimeTypeDef  stimestructure;
    RTC_AlarmTypeDef salarmstructure;
   
    /*##-1- Configure the Date #################################################*/
    /* Set Date: Tuesday February 18th 2014 */
    sdatestructure.Year = 0x14;
    sdatestructure.Month = RTC_MONTH_FEBRUARY;
    sdatestructure.Date = 0x18;
    sdatestructure.WeekDay = RTC_WEEKDAY_TUESDAY;
    
    if(HAL_RTC_SetDate(&RtcHandle,&sdatestructure, RTC_FORMAT_BCD) != HAL_OK)
    {
      /* Initialization Error */
      Error_Handler(); 
    } 
    
    /*##-2- Configure the Time #################################################*/
    /* Set Time: 02:20:00 */
    stimestructure.Hours = 0x02;
    stimestructure.Minutes = 0x20;
    stimestructure.Seconds = 0x00;
    stimestructure.TimeFormat = RTC_HOURFORMAT12_AM;
    stimestructure.DayLightSaving = RTC_DAYLIGHTSAVING_NONE ;
    stimestructure.StoreOperation = RTC_STOREOPERATION_RESET;
    
    if(HAL_RTC_SetTime(&RtcHandle,&stimestructure, RTC_FORMAT_BCD) != HAL_OK)
    {
      /* Initialization Error */
      Error_Handler(); 
    }  
  
    /*##-3- Configure the RTC Alarm peripheral #################################*/
    /* Set Alarm to 02:20:30 
       RTC Alarm Generation: Alarm on Hours, Minutes and Seconds */
    salarmstructure.Alarm = RTC_ALARM_A;
    salarmstructure.AlarmDateWeekDay = RTC_WEEKDAY_MONDAY;
    salarmstructure.AlarmDateWeekDaySel = RTC_ALARMDATEWEEKDAYSEL_DATE;
    salarmstructure.AlarmMask = RTC_ALARMMASK_DATEWEEKDAY;
    salarmstructure.AlarmSubSecondMask = RTC_ALARMSUBSECONDMASK_NONE;
    salarmstructure.AlarmTime.TimeFormat = RTC_HOURFORMAT12_AM;
   salarmstructure.AlarmTime.Hours = 0x02;
    salarmstructure.AlarmTime.Minutes = 0x20;
    salarmstructure.AlarmTime.Seconds = 0x30;
    salarmstructure.AlarmTime.SubSeconds = 0x56;
    
    if(HAL_RTC_SetAlarm_IT(&RtcHandle,&salarmstructure, RTC_FORMAT_BCD) != HAL_OK)
    {
      /* Initialization Error */
      Error_Handler(); 
    }
  }
  
  /**
    * @brief  Display the current time.
    * @param  showtime : pointer to buffer
    * @retval None
    */
  static void RTC_TimeShow(uint8_t* showtime)
  {
    RTC_DateTypeDef sdatestructureget;
    RTC_TimeTypeDef stimestructureget;
    
    /* Get the RTC current Time */
    HAL_RTC_GetTime(&RtcHandle, &stimestructureget, RTC_FORMAT_BIN);
    /* Get the RTC current Date */
    HAL_RTC_GetDate(&RtcHandle, &sdatestructureget, RTC_FORMAT_BIN);
    /* Display time Format : hh:mm:ss */
    sprintf((char*)showtime,"%02d:%02d:%02d",stimestructureget.Hours, stimestructureget.Minutes, stimestructureget.Seconds);
  } 
  
  #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 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) */
  
    /* Infinite loop */
    while (1)
    {
    }
  }
  #endif
  
  /**
    * @}
    */
  
  /**
    * @}
    */
  
  /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
  