/**
  ******************************************************************************
  * @file    RTC/RTC_Alarm/Src/main.c
  * @author  MCD Application Team
  * @brief   This sample code shows how to use STM32H7xx RTC HAL API to configure
  *          Time and Date.
  ******************************************************************************
  * @attention
  *
  * Copyright (c) 2019 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.
  *
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include "main.h"

/** @addtogroup STM32H7xx_HAL_Examples
  * @{
  */

/** @addtogroup RTC_Alarm
  * @{
  */

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/

/* Flag giving the status of the RTC alarm (set off or not yet) */
__IO FlagStatus AlarmStatus = RESET;

/* RTC handler declaration */
RTC_HandleTypeDef RtcHandle;

/* Buffer used for displaying Time */
uint8_t aShowTime[20] = "hh:ms:ss";

/* Private function prototypes -----------------------------------------------*/
static void MPU_Config(void);
static void SystemClock_Config(void);
static void RTC_AlarmConfig(void);
static void RTC_TimeShow(uint8_t *showtime);
static void CPU_CACHE_Enable(void);
/* Private functions ---------------------------------------------------------*/

/**
  * @brief  Main program
  * @param  None
  * @retval None
  */
int main(void)
{
  
  /* Configure the MPU attributes */
  MPU_Config();

  /* Enable the CPU Cache */
  CPU_CACHE_Enable();
  /* STM32H7xx HAL library initialization:
       - 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
     */
  HAL_Init();

  /* Configure the system clock to 280 MHz */
  SystemClock_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);
	
    /*##-4- Make LED1 blink at 1Hz while Alarm still not set off #############*/
    if (AlarmStatus == RESET)
    {
      /* Change the state of LED1 (switch on if LED1 was off and vice-versa) */
      BSP_LED_Toggle(LED1);
      /* Wait during 500ms (to make LED1 blink at 1Hz) */
      HAL_Delay(500);
    }
  }
}

/**
  * @brief  Alarm callback
  * @param  hrtc : RTC handle
  * @retval None
  */
void HAL_RTC_AlarmAEventCallback(RTC_HandleTypeDef *hrtc)
{
  /* Indicate to main program that RTC alarm has been set off */
  AlarmStatus = SET;
  /* 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)                     = 280000000 (CPU Clock)
  *            HCLK(Hz)                       = 280000000 (Bus matrix and AHBs Clock)
  *            AHB Prescaler                  = 1
  *            CD APB3 Prescaler              = 2 (APB3 Clock  140MHz)
  *            CD APB1 Prescaler              = 2 (APB1 Clock  140MHz)
  *            CD APB2 Prescaler              = 2 (APB2 Clock  140MHz)
  *            SRD APB4 Prescaler             = 2 (APB4 Clock  140MHz)
  *            HSE Frequency(Hz)              = 8000000
  *            PLL_M                          = 4
  *            PLL_N                          = 280
  *            PLL_P                          = 2
  *            PLL_Q                          = 2
  *            PLL_R                          = 2
  *            VDD(V)                         = 3.3
  *            Flash Latency(WS)              = 6
  * @param  None
  * @retval None
  */
static void SystemClock_Config(void)
{
  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
  RCC_OscInitTypeDef RCC_OscInitStruct = {0};

  /*!< Supply configuration update enable */
  HAL_PWREx_ConfigSupply(PWR_DIRECT_SMPS_SUPPLY);

  /* 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_SCALE0);

  while(!__HAL_PWR_GET_FLAG(PWR_FLAG_VOSRDY)) {}

  /* Enable HSE Oscillator and activate PLL with HSE as source */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
  RCC_OscInitStruct.HSEState = RCC_HSE_BYPASS;
  RCC_OscInitStruct.HSIState = RCC_HSI_OFF;
  RCC_OscInitStruct.CSIState = RCC_CSI_OFF;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;

  RCC_OscInitStruct.PLL.PLLM = 4;
  RCC_OscInitStruct.PLL.PLLN = 280;
  RCC_OscInitStruct.PLL.PLLFRACN = 0;
  RCC_OscInitStruct.PLL.PLLP = 2;
  RCC_OscInitStruct.PLL.PLLR = 2;
  RCC_OscInitStruct.PLL.PLLQ = 2;

  RCC_OscInitStruct.PLL.PLLVCOSEL = RCC_PLL1VCOWIDE;
  RCC_OscInitStruct.PLL.PLLRGE = RCC_PLL1VCIRANGE_1;
  if(HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    /* Initialization Error */
    while(1);
  }

  /* Select PLL as system clock source and configure the bus clocks dividers */
  RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_D1PCLK1 | RCC_CLOCKTYPE_PCLK1 | \
    RCC_CLOCKTYPE_PCLK2  | RCC_CLOCKTYPE_D3PCLK1);

  RCC_ClkInitStruct.SYSCLKSource   = RCC_SYSCLKSOURCE_PLLCLK;
  RCC_ClkInitStruct.SYSCLKDivider  = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.AHBCLKDivider  = RCC_HCLK_DIV1;
  RCC_ClkInitStruct.APB3CLKDivider = RCC_APB3_DIV2;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_APB1_DIV2;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_APB2_DIV2;
  RCC_ClkInitStruct.APB4CLKDivider = RCC_APB4_DIV2;
  if(HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_6) != HAL_OK)
  {
    /* Initialization Error */
    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 100 milliseconds */
    BSP_LED_Toggle(LED3);
    HAL_Delay(50);
  }
}

/**
  * @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 2nd 2016 */
  sdatestructure.Year = 0x16;
  sdatestructure.Month = RTC_MONTH_FEBRUARY;
  sdatestructure.Date = 0x2;
  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_WEEKDAY;
  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;
#ifdef RTC_CLOCK_SOURCE_LSI
  salarmstructure.AlarmTime.SubSeconds = 0x0F9;
#elif defined (RTC_CLOCK_SOURCE_LSE)
  salarmstructure.AlarmTime.SubSeconds = 0x0FF;
#endif

  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);
}


/**
  * @brief  CPU L1-Cache enable.
  * @param  None
  * @retval None
  */
static void CPU_CACHE_Enable(void)
{
  /* Enable I-Cache */
  SCB_EnableICache();

  /* Enable D-Cache */
  SCB_EnableDCache();
}


/**
  * @brief  Configure the MPU attributes
  * @param  None
  * @retval None
  */
static void MPU_Config(void)
{
  MPU_Region_InitTypeDef MPU_InitStruct;

  /* Disable the MPU */
  HAL_MPU_Disable();

  /* Configure the MPU as Strongly ordered for not defined regions */
  MPU_InitStruct.Enable = MPU_REGION_ENABLE;
  MPU_InitStruct.BaseAddress = 0x00;
  MPU_InitStruct.Size = MPU_REGION_SIZE_4GB;
  MPU_InitStruct.AccessPermission = MPU_REGION_NO_ACCESS;
  MPU_InitStruct.IsBufferable = MPU_ACCESS_NOT_BUFFERABLE;
  MPU_InitStruct.IsCacheable = MPU_ACCESS_NOT_CACHEABLE;
  MPU_InitStruct.IsShareable = MPU_ACCESS_SHAREABLE;
  MPU_InitStruct.Number = MPU_REGION_NUMBER0;
  MPU_InitStruct.TypeExtField = MPU_TEX_LEVEL0;
  MPU_InitStruct.SubRegionDisable = 0x87;
  MPU_InitStruct.DisableExec = MPU_INSTRUCTION_ACCESS_DISABLE;

  HAL_MPU_ConfigRegion(&MPU_InitStruct);

  /* Enable the MPU */
  HAL_MPU_Enable(MPU_PRIVILEGED_DEFAULT);
}

#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

/**
  * @}
  */

/**
  * @}
  */