/**
  ******************************************************************************
  * @file    RTC/RTC_Tamper/Src/main.c
  * @author  MCD Application Team
  * @brief   This sample code shows how to use STM32F0xx RTC HAL API to write/read
  *          data to/from RTC Backup data registers and demonstrates the Tamper
  *          detection feature.
  ******************************************************************************
  * @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 STM32F0xx_HAL_Examples
  * @{
  */

/** @addtogroup RTC_Tamper
  * @{
  */

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* RTC handler declaration */
RTC_HandleTypeDef RtcHandle;

__IO FlagStatus TamperStatus = RESET;

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


/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);

/* Private functions ---------------------------------------------------------*/

/**
  * @brief  Main program
  * @param  None
  * @retval None
  */
int main(void)
{
  GPIO_InitTypeDef  GPIO_InitStruct;
  uint32_t index = 0;
  RTC_TamperTypeDef  stamperstructure;
  
  /* STM32F0xx 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.
       - Low Level Initialization
     */
  HAL_Init();

  /* Configure the system clock to 48 MHz */
  SystemClock_Config();

  /* Configure LED3 */
  BSP_LED_Init(LED3);

  /* Configure PA.00 (Arduino A0) button */
  GPIO_InitStruct.Pin = GPIO_PIN_0;
  GPIO_InitStruct.Pull = GPIO_PULLUP;
  GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
  
  /* Enable GPIOA clock */
  __HAL_RCC_GPIOA_CLK_ENABLE();

  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
  /*##-1- Configure the RTC peripheral #######################################*/
  /* 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.Instance            = RTC;
  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 RTC Tamper ###############################################*/
  stamperstructure.Tamper                       = RTC_TAMPER_2;
  stamperstructure.Trigger                      = RTC_TAMPERTRIGGER_FALLINGEDGE;
  stamperstructure.Filter                       = RTC_TAMPERFILTER_DISABLE;
  stamperstructure.SamplingFrequency            = RTC_TAMPERSAMPLINGFREQ_RTCCLK_DIV32768;
  stamperstructure.PrechargeDuration            = RTC_TAMPERPRECHARGEDURATION_1RTCCLK;
  stamperstructure.TamperPullUp                 = RTC_TAMPER_PULLUP_ENABLE;
  stamperstructure.TimeStampOnTamperDetection   = RTC_TIMESTAMPONTAMPERDETECTION_DISABLE;

  if (HAL_RTCEx_SetTamper_IT(&RtcHandle, &stamperstructure) != HAL_OK)
  {
    /* Initialization Error */
    Error_Handler();
  }

  /* Clear the Tamper interrupt pending bit */
  __HAL_RTC_TAMPER_CLEAR_FLAG(&RtcHandle,RTC_FLAG_TAMP2F);

  /*##-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)))
    {
      Error_Handler();
    }
  }

  /*##-5- Wait for the tamper button is pressed ##############################*/
  while (TamperStatus != SET)
  {
    /* Toggle LED3 with a period of 1s */
    BSP_LED_Toggle(LED3);

    /* Delay */
    HAL_Delay(1000);
  }

  /*##-6- Deactivate the tamper                 ##############################*/
  HAL_RTCEx_DeactivateTamper(&RtcHandle, RTC_TAMPER_2);
    
  /*##-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)
    {
      Error_Handler();
    }
  }

  /* Infinite loop */
  while (1)
  {
    /* Turn LED3 on */
    BSP_LED_Toggle(LED3);

    /* Delay */
    HAL_Delay(100);
  }
}

/**
  * @brief  System Clock Configuration
  *         The system Clock is configured as follow : 
  *            System Clock source            = PLL (HSI/2)
  *            SYSCLK(Hz)                     = 48000000
  *            HCLK(Hz)                       = 48000000
  *            AHB Prescaler                  = 1
  *            APB1 Prescaler                 = 1
  *            HSI Frequency(Hz)              = 8000000
  *            PREDIV                         = 1
  *            PLLMUL                         = 12
  *            Flash Latency(WS)              = 1
  * @param  None
  * @retval None
  */
void SystemClock_Config(void)
{
  RCC_ClkInitTypeDef RCC_ClkInitStruct;
  RCC_OscInitTypeDef RCC_OscInitStruct;
  
  /* No HSE Oscillator on Nucleo, Activate PLL with HSI/2 as source */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_NONE;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
  RCC_OscInitStruct.PLL.PREDIV = RCC_PREDIV_DIV1;
  RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL12;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct)!= HAL_OK)
  {
    /* Initialization Error */
    while(1); 
  }

  /* Select PLL as system clock source and configure the HCLK, PCLK1 clocks dividers */
  RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1);
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1)!= HAL_OK)
  {
    /* Initialization Error */
    while(1); 
  }
}
/**
  * @brief  This function is executed in case of error occurrence.
  * @param  None
  * @retval None
  */
void Error_Handler(void)
{
  /* Turn LED3 on */
  BSP_LED_On(LED3);
  while (1)
  {
  }
}

/**
  * @brief  Tamper event callback function
  * @param  RTC handle
  * @retval None
  */
void HAL_RTCEx_Tamper2EventCallback(RTC_HandleTypeDef *hrtc)
{
}

#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(char *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****/
