/**
  ******************************************************************************
  * @file    main.c
  * @author  MCU Application Team
  * @brief   Main program body
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; Copyright (c) 2023 Puya Semiconductor Co.
  * All rights reserved.</center></h2>
  *
  * This software component is licensed by Puya under BSD 3-Clause license,
  * the "License"; You may not use this file except in compliance with the
  * License. You may obtain a copy of the License at:
  *                        opensource.org/licenses/BSD-3-Clause
  *
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; Copyright (c) 2016 STMicroelectronics.
  * All rights reserved.</center></h2>
  *
  * This software component is licensed by ST under BSD 3-Clause license,
  * the "License"; You may not use this file except in compliance with the
  * License. You may obtain a copy of the License at:
  *                        opensource.org/licenses/BSD-3-Clause
  *
  ******************************************************************************
  */

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

/* Private define ------------------------------------------------------------*/
#define BACKUP_COUNT 5

/* Private variables ---------------------------------------------------------*/
/* RTC handler declaration */
RTC_HandleTypeDef RtcHandle;
RTC_TamperTypeDef TamperStruct;

__IO FlagStatus TamperStatus;

/* Backup registers table */
uint32_t aBKPDataReg[BACKUP_COUNT] =
{
  RTC_BKP_DR0,  RTC_BKP_DR1,
  RTC_BKP_DR2,  RTC_BKP_DR3,
  RTC_BKP_DR4
};

/* Private user code ---------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
static void APP_SystemClockConfig(void);
static void APP_GpioConfig(void);

/**
  * @brief  Main program.
  * @retval int
  */
int main(void)
{
  uint32_t index = 0;
  
  /* Reset of all peripherals, Initializes the Systick. */
  HAL_Init();
  
  /* Configure system clock */
  APP_SystemClockConfig(); 

  /* Initialize LED */
  BSP_LED_Init(LED_GREEN);
  
  /*##-1- Configure the RTC peripheral #######################################*/
  /* Configure RTC prescaler and RTC data registers */
  /* RTC configured as follow:
      - Asynch Prediv  = Calculated automatically by HAL */
  RtcHandle.Instance = RTC;                        /* Select RTC */
  RtcHandle.Init.AsynchPrediv = RTC_AUTO_1_SECOND; /* RTC asynchronous prescaler calculated automatically for one second time base */
  RtcHandle.Init.OutPut = RTC_OUTPUTSOURCE_NONE;   /* No output on the TAMPER pin */
  if (HAL_RTC_Init(&RtcHandle) != HAL_OK)
  {
    APP_ErrorHandler();
  }

  /*##-2- Configure RTC Tamper ###############################################*/
  APP_GpioConfig();
  
  TamperStruct.Tamper   = RTC_TAMPER_1;
  TamperStruct.Trigger  = RTC_TAMPERTRIGGER_LOWLEVEL;
  if (HAL_RTCEx_SetTamper_IT(&RtcHandle, &TamperStruct) != HAL_OK)
  {
    APP_ErrorHandler();
  }

  /* Clear the Tamper interrupt pending bit */
  __HAL_RTC_TAMPER_CLEAR_FLAG(&RtcHandle,RTC_FLAG_TAMP1F);

  /*##-3- Write Data on the Back Up registers ################################*/
  for (index = 0; index < BACKUP_COUNT; index++)
  {
    HAL_RTCEx_BKUPWrite(&RtcHandle, aBKPDataReg[index], 0xDF59 + (index * 0x5A));
  }

  /*##-4- Check Data is stored on the Back Up registers ######################*/
  for (index = 0; index < BACKUP_COUNT; index++)
  {
    if (HAL_RTCEx_BKUPRead(&RtcHandle, aBKPDataReg[index]) != (0xDF59 + (index * 0x5A)))
    {
      APP_ErrorHandler();
    }
  }

  /* Turn LED on */
  BSP_LED_On(LED_GREEN);

  /* Reset flag after writing of backup register in order to wait for new button press */
  TamperStatus = RESET;

  /*##-5- Wait for the tamper button is pressed ##############################*/
  while (TamperStatus != SET);

  /*##-6- Deactivate the tamper                 ##############################*/
  HAL_RTCEx_DeactivateTamper(&RtcHandle, RTC_TAMPER_1);
    
  /*##-7- Check Data is cleared on the Back Up registers #####################*/
  for (index = 0; index < BACKUP_COUNT; index++)
  {
    if (HAL_RTCEx_BKUPRead(&RtcHandle, aBKPDataReg[index]) != 0x00)
    {
      APP_ErrorHandler();
    }
  }
  
  /* Infinite loop */
  while (1)
  {
    /* LED blinking */
    BSP_LED_Toggle(LED_GREEN);
    HAL_Delay(500);
  }
}

/**
  * @brief  GPIO configuration
  * @param  None
  * @retval None
  */
static void APP_GpioConfig(void)
{
  GPIO_InitTypeDef  GPIO_InitStruct = {0};

  __HAL_RCC_GPIOC_CLK_ENABLE();                       /* Enable clock */

  GPIO_InitStruct.Pin = GPIO_PIN_13;
  GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;            /* Push-pull output */
  GPIO_InitStruct.Pull = GPIO_PULLUP;                 /* Enable pull-up */
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;       /* GPIO speed */  
  /* GPIO Initialization */
  HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);
}

/**
  * @brief  System Clock Configuration
  * @param  None
  * @retval None
  */
static void APP_SystemClockConfig(void)
{
  RCC_OscInitTypeDef  OscInitstruct = {0};
  RCC_ClkInitTypeDef  ClkInitstruct = {0};
  
  OscInitstruct.OscillatorType      = RCC_OSCILLATORTYPE_HSE | RCC_OSCILLATORTYPE_HSI | RCC_OSCILLATORTYPE_LSE | 
                                      RCC_OSCILLATORTYPE_LSI;
  OscInitstruct.HSIState            = RCC_HSI_ON;                               /* Enable HSI */
  OscInitstruct.HSIDiv              = RCC_HSI_DIV1;                             /* HSI 1 frequency division */
  OscInitstruct.HSICalibrationValue = RCC_HSICALIBRATION_8MHz;                  /* Configure HSI clock 8MHz */
  OscInitstruct.HSEState            = RCC_HSE_OFF;                              /* Close HSE */
/* OscInitstruct.HSEFreq             = RCC_HSE_24_32MHz; */                     /* Choose HSE frequency of 24-32MHz */
  OscInitstruct.LSEState            = RCC_LSE_OFF;                              /* Close LSE */
/* OscInitstruct.LSEDriver           = RCC_LSEDRIVE_HIGH; */                    /* Drive capability level: high */
  OscInitstruct.LSIState            = RCC_LSI_OFF;                              /* Close LSI */
  OscInitstruct.PLL.PLLState        = RCC_PLL_OFF;                              /* Close PLL */
/* OscInitstruct.PLL.PLLSource       = RCC_PLLSOURCE_HSI; */                    /* PLL clock source selection HSI */
/* OscInitstruct.PLL.PLLMUL          = RCC_PLL_MUL16; */                        /* PLL clock source 16-fold frequency */
  /* Configure oscillator */
  if(HAL_RCC_OscConfig(&OscInitstruct) != HAL_OK)
  {
    APP_ErrorHandler();
  }
  
  ClkInitstruct.ClockType       = RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2;
  ClkInitstruct.SYSCLKSource    = RCC_SYSCLKSOURCE_HSISYS;              /* System clock selection HSISYS */
  ClkInitstruct.AHBCLKDivider   = RCC_SYSCLK_DIV1;                      /* AHB clock 1 division */
  ClkInitstruct.APB1CLKDivider  = RCC_HCLK_DIV1;                        /* APB1 clock 1 division */
  ClkInitstruct.APB2CLKDivider  = RCC_HCLK_DIV2;                        /* APB2 clock 2 division */
  /* Configure Clock */
  if(HAL_RCC_ClockConfig(&ClkInitstruct, FLASH_LATENCY_0) != HAL_OK)
  {
    APP_ErrorHandler();
  }
}

/**
  * @brief  This function is executed in case of error occurrence.
  * @param  None
  * @retval None
  */
void APP_ErrorHandler(void)
{
  /* Infinite loop */
  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 can add his own implementation to report the file name and line number,
     for example: printf("Wrong parameters value: file %s on line %d\r\n", file, line)  */
  /* Infinite loop */
  while (1)
  {
  }
}
#endif /* USE_FULL_ASSERT */

/************************ (C) COPYRIGHT Puya *****END OF FILE******************/
