/* USER CODE BEGIN Header */
/**
  ******************************************************************************
  * @file    RTC/RTC_Tamper/Src/main.c
  * @author  MCD Application Team
  * @brief   This sample code shows how to use STM32WLxx RTC HAL API to write/read
  *          data to/from RTC Backup data registers and demonstrates the Tamper
  *          detection feature.
  ******************************************************************************
  * @attention
  *
  * Copyright (c) 2020 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.
  *
  ******************************************************************************
  */
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"

/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */

/* USER CODE END Includes */

/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */

/* USER CODE END PTD */

/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
/* USER CODE END PD */

/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */

/* USER CODE END PM */

/* Private variables ---------------------------------------------------------*/
RTC_HandleTypeDef hrtc;

/* USER CODE BEGIN PV */
__IO FlagStatus TamperStatus;

/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_RTC_Init(void);
/* USER CODE BEGIN PFP */

/* USER CODE END PFP */

/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */

/* USER CODE END 0 */

/**
  * @brief  The application entry point.
  * @retval int
  */
int main(void)
{
  /* USER CODE BEGIN 1 */
  uint32_t i;

  /* STM32WLxx 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
     */
  /* USER CODE END 1 */

  /* MCU Configuration--------------------------------------------------------*/

  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
  HAL_Init();

  /* USER CODE BEGIN Init */
  /* Configure LED2 */
  BSP_LED_Init(LED2);

  /* USER CODE END Init */

  /* Configure the system clock */
  SystemClock_Config();

  /* USER CODE BEGIN SysInit */

  /* Clear tamper interrupt flag */
  TamperStatus = RESET;

  /* USER CODE END SysInit */

  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_RTC_Init();
  /* USER CODE BEGIN 2 */

  /* Check if Tamper detection occurs just after MX_RTC_Init */
  if (TamperStatus != RESET)
  {
    /* Early tamper detection is not a correct behavior. 
       Please set the board as described in the readme.txt */
    Error_Handler();
  }

  /* Set all backup registers to 0xFFFFFFFF.
     Backup registers will be cleared by a tamper detection. */
  for (uint32_t i = 0; i < RTC_BKP_NUMBER; i++)
  {
    HAL_RTCEx_BKUPWrite(&hrtc, i, 0xFFFFFFFF);
  }

  /* Check that Backup registers have been written*/
  for (i = 0; i < RTC_BKP_NUMBER; i++)
  {
    if (HAL_RTCEx_BKUPRead(&hrtc, i) != 0xFFFFFFFF)
    {
      Error_Handler();
    }
  }

  /* Wait for tamper detection. User must act as described in the readme.txt */
  while (TamperStatus == RESET);

  /* Disable the tamper  */
  if (HAL_RTCEx_DeactivateTamper(&hrtc, RTC_TAMPER_1) != HAL_OK)
  {
    Error_Handler();
  }

  /* Check that Backup registers have been cleared by the tamper detection */
  for (i = 0; i < RTC_BKP_NUMBER; i++)
  {
    if (HAL_RTCEx_BKUPRead(&hrtc, i) != 0)
    {
      Error_Handler();
    }
  }

  /* Test is OK Turn on LED2 */
  BSP_LED_On(LED2);
  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
    /* USER CODE END WHILE */

    /* USER CODE BEGIN 3 */
  }
  /* USER CODE END 3 */
}

/**
  * @brief System Clock Configuration
  * @retval None
  */
void SystemClock_Config(void)
{
  RCC_OscInitTypeDef RCC_OscInitStruct = {0};
  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};

  /** Configure LSE Drive Capability
  */
  HAL_PWR_EnableBkUpAccess();
  __HAL_RCC_LSEDRIVE_CONFIG(RCC_LSEDRIVE_LOW);
  /** Configure the main internal regulator output voltage
  */
  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);

  /** Initializes the CPU, AHB and APB buses clocks
  */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSE|RCC_OSCILLATORTYPE_MSI;
  RCC_OscInitStruct.LSEState = RCC_LSE_ON;
  RCC_OscInitStruct.MSIState = RCC_MSI_ON;
  RCC_OscInitStruct.MSICalibrationValue = RCC_MSICALIBRATION_DEFAULT;
  RCC_OscInitStruct.MSIClockRange = RCC_MSIRANGE_11;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    Error_Handler();
  }
  /** Configure the SYSCLKSource, HCLK, PCLK1 and PCLK2 clocks dividers
  */
  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK3|RCC_CLOCKTYPE_HCLK
                              |RCC_CLOCKTYPE_SYSCLK|RCC_CLOCKTYPE_PCLK1
                              |RCC_CLOCKTYPE_PCLK2;
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_MSI;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
  RCC_ClkInitStruct.AHBCLK3Divider = RCC_SYSCLK_DIV1;

  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK)
  {
    Error_Handler();
  }
}

/**
  * @brief RTC Initialization Function
  * @param None
  * @retval None
  */
static void MX_RTC_Init(void)
{

  /* USER CODE BEGIN RTC_Init 0 */

  /* USER CODE END RTC_Init 0 */

  RTC_TamperTypeDef sTamper = {0};

  /* USER CODE BEGIN RTC_Init 1 */

  /* Use __HAL_DBGMCU_FREEZE_RTC(); to freeze the RTC during debug */
  /* 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();
  }
  /** Enable the RTC Tamper 1
  */
  sTamper.Tamper = RTC_TAMPER_1;
  sTamper.Trigger = RTC_TAMPERTRIGGER_RISINGEDGE;
  sTamper.NoErase = RTC_TAMPER_ERASE_BACKUP_ENABLE;
  sTamper.MaskFlag = RTC_TAMPERMASK_FLAG_DISABLE;
  sTamper.Filter = RTC_TAMPERFILTER_DISABLE;
  sTamper.SamplingFrequency = RTC_TAMPERSAMPLINGFREQ_RTCCLK_DIV32768;
  sTamper.PrechargeDuration = RTC_TAMPERPRECHARGEDURATION_1RTCCLK;
  sTamper.TamperPullUp = RTC_TAMPER_PULLUP_ENABLE;
  sTamper.TimeStampOnTamperDetection = RTC_TIMESTAMPONTAMPERDETECTION_ENABLE;
  if (HAL_RTCEx_SetTamper_IT(&hrtc, &sTamper) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN RTC_Init 2 */

  /* Calendar ultra-low power mode */
  if (HAL_RTCEx_SetLowPowerCalib(&hrtc, RTC_LPCAL_SET) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE END RTC_Init 2 */

}

/**
  * @brief GPIO Initialization Function
  * @param None
  * @retval None
  */
static void MX_GPIO_Init(void)
{

  /* GPIO Ports Clock Enable */
  __HAL_RCC_GPIOC_CLK_ENABLE();

}

/* USER CODE BEGIN 4 */
/**
  * @brief  Tamper event callback function
  * @param  RTC handle
  * @retval None
  */
void HAL_RTCEx_Tamper1EventCallback(RTC_HandleTypeDef *hrtc)
{
  TamperStatus = SET;
}

/* USER CODE END 4 */

/**
  * @brief  This function is executed in case of error occurrence.
  * @retval None
  */
void Error_Handler(void)
{
  /* USER CODE BEGIN Error_Handler_Debug */
  while (1)
  {
    BSP_LED_Toggle(LED2);
    HAL_Delay(100);
  }
  /* USER CODE END Error_Handler_Debug */
}

#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 CODE BEGIN 6 */
  /* 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) */
  /* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */