/**
  ******************************************************************************
  * @file    CRC/CRC_Bytes_Stream_7bit_CRC/Src/main.c
  * @author  MCD Application Team
  * @brief   This sample code shows how to use the STM32F0xx CRC HAL API
  *          to compute 7-bit CRC codes from buffers of data bytes (8-bit data),
  *          based on a user-defined generating polynomial.
  ******************************************************************************
  * @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 CRC_Bytes_Stream_7bit_CRC
  * @{
  */

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#define BUFFER_SIZE_5  5  /* CRC7_DATA8_TEST5[] is 5-byte long   */ 
#define BUFFER_SIZE_17 17 /* CRC7_DATA8_TEST17[] is 17-byte long */ 
#define BUFFER_SIZE_1  1  /* CRC7_DATA8_TEST1[] is 1-byte long   */ 
#define BUFFER_SIZE_2  2  /* CRC7_DATA8_TEST2[] is 2-byte long   */ 

/* User-defined polynomial */
#define CRC_POLYNOMIAL_7B  0x65  /* X^7 + X^6 + X^5 + X^2 + 1,
                                   used in Train Communication Network, IEC 60870-5[17] */

/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* CRC handler declaration */
CRC_HandleTypeDef   CrcHandle;

/* Used for storing CRC Value */
__IO uint32_t uwCRCValue = 0;

/* Bytes buffers that will consecutively yield CRCs */
static const uint8_t CRC7_DATA8_TEST5[5]   = {0x12,0x34,0xBA,0x71,0xAD};
static const uint8_t CRC7_DATA8_TEST17[17] = {0x12,0x34,0xBA,0x71,0xAD,
                                              0x11,0x56,0xDC,0x88,0x1B,
                                              0xEE,0x4D,0x82, 0x93,0xA6,
                                              0x7F,0xC3};
static const uint8_t CRC7_DATA8_TEST1[1]   = {0x19};                                                
static const uint8_t CRC7_DATA8_TEST2[2]   = {0xAB,0xCD};

       

/* Expected CRC Values */
/* The 7 LSB bits are the 7-bit long CRC */
uint32_t uwExpectedCRCValue_1 = 0x00000057;    /* First byte stream CRC  */
uint32_t uwExpectedCRCValue_2 = 0x0000006E;    /* Second byte stream CRC */
uint32_t uwExpectedCRCValue_3 = 0x0000004B;    /* Third byte stream CRC  */
uint32_t uwExpectedCRCValue_4 = 0x00000026;    /* Fourth byte stream CRC */

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

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

/**
  * @brief  Main program
  * @param  None
  * @retval None
  */
int main(void)
{

  /* 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 LED2 */
  BSP_LED_Init(LED2);


  /****************************************************************************/
  /*                                                                          */
  /*                     CRC peripheral initialization                        */
  /*                                                                          */    
  /****************************************************************************/
    
  CrcHandle.Instance = CRC;

  /* The default polynomial is not used. The one to be used must be defined 
     in CrcHandle.Init.GeneratingPolynomial */  
  CrcHandle.Init.DefaultPolynomialUse    = DEFAULT_POLYNOMIAL_DISABLE;
  
  /* Set the value of the generating polynomial. 
    The one used in that example is the 7-bit long CRC generating
    polynomial X^7 + X^6 + X^5 + X^2 + 1 */
  CrcHandle.Init.GeneratingPolynomial    = CRC_POLYNOMIAL_7B;
  
  /* The user-defined generating polynomial yields a 7-bit long CRC */
  CrcHandle.Init.CRCLength               = CRC_POLYLENGTH_7B;

  /* The default init value is used */
  CrcHandle.Init.DefaultInitValueUse     = DEFAULT_INIT_VALUE_ENABLE;

  /* The input data are not inverted */
  CrcHandle.Init.InputDataInversionMode  = CRC_INPUTDATA_INVERSION_NONE;

  /* The output data are not inverted */
  CrcHandle.Init.OutputDataInversionMode = CRC_OUTPUTDATA_INVERSION_DISABLE;

  /* The input data are bytes (8-bit long data) */
  CrcHandle.InputDataFormat              = CRC_INPUTDATA_FORMAT_BYTES;

  /* De-initialize the CRC peripheral */
  if (HAL_CRC_DeInit(&CrcHandle) != HAL_OK)
  {
    /* Initialization Error */
    Error_Handler();
  }  

  /* Then, initialize the CRC handle */
  if (HAL_CRC_Init(&CrcHandle) != HAL_OK)
  {
    /* Initialization Error */
    Error_Handler();
  }


  /****************************************************************************/
  /*                                                                          */
  /*         CRC computation of a first bytes stream                          */
  /*                                                                          */    
  /****************************************************************************/

  /* The 7-bit long CRC of a 5-byte buffer is computed. After IP initialization, 
     the CRC calculator is initialized with the default value that is 0x7F for 
     a 7-bit CRC.
    
    The computed CRC is stored in uint32_t uwCRCValue. The 7-bit long CRC is made of
    uwCRCValue 7 LSB bits. */

  uwCRCValue = HAL_CRC_Accumulate(&CrcHandle, (uint32_t *)&CRC7_DATA8_TEST5, BUFFER_SIZE_5);

  /* Compare the CRC value to the expected one */
  if (uwCRCValue != uwExpectedCRCValue_1)
  {
    /* Wrong CRC value: enter Error_Handler */
    Error_Handler();
  }

  
  /****************************************************************************/
  /*                                                                          */
  /*         CRC computation of a second bytes stream                         */
  /*                                                                          */    
  /****************************************************************************/

  /* The 7-bit long CRC of a 17-byte buffer is computed. The CRC calculator
    is not re-initialized, instead the previously computed CRC is used
    as initial value. */

  uwCRCValue = HAL_CRC_Accumulate(&CrcHandle, (uint32_t *)&CRC7_DATA8_TEST17, BUFFER_SIZE_17);

  /* Compare the CRC value to the expected one */
  if (uwCRCValue != uwExpectedCRCValue_2)
  {
    /* Wrong CRC value: enter Error_Handler */
    Error_Handler();
  }


  /****************************************************************************/
  /*                                                                          */
  /*         CRC computation of a single byte                                 */
  /*                                                                          */    
  /****************************************************************************/

  /* The 7-bit long CRC of a 1-byte buffer is computed. The CRC calculator
    is not re-initialized, instead the previously computed CRC is used
    as initial value. */

  uwCRCValue = HAL_CRC_Accumulate(&CrcHandle, (uint32_t *)&CRC7_DATA8_TEST1, BUFFER_SIZE_1);

  /* Compare the CRC value to the expected one */
  if (uwCRCValue != uwExpectedCRCValue_3)
  {
    /* Wrong CRC value: enter Error_Handler */
    Error_Handler();
  }


  /****************************************************************************/
  /*                                                                          */
  /*         CRC computation of the last bytes stream                         */
  /*                                                                          */    
  /****************************************************************************/

  /* The 7-bit long CRC of a 2-byte buffer is computed. The CRC calculator
    is re-initialized with the default value that is 0x7F for a 7-bit CRC.
    This is done with a call to HAL_CRC_Calculate() instead of 
    HAL_CRC_Accumulate(). */

  uwCRCValue = HAL_CRC_Calculate(&CrcHandle, (uint32_t *)&CRC7_DATA8_TEST2, BUFFER_SIZE_2);

  /* Compare the CRC value to the expected one */
  if (uwCRCValue != uwExpectedCRCValue_4)
  {
    /* Wrong CRC value: enter Error_Handler */
    Error_Handler();
  }
  else
  {
    /* Right CRC value: Turn LED2 on */
    BSP_LED_On(LED2);
  }  


  /* Infinite loop */
  while (1)
  {
  }
}

/**
  * @brief  System Clock Configuration
  *         The system Clock is configured as follow : 
  *            System Clock source            = PLL (HSI48)
  *            SYSCLK(Hz)                     = 48000000
  *            HCLK(Hz)                       = 48000000
  *            AHB Prescaler                  = 1
  *            APB1 Prescaler                 = 1
  *            HSI Frequency(Hz)              = 48000000
  *            PREDIV                         = 2
  *            PLLMUL                         = 2
  *            Flash Latency(WS)              = 1
  * @param  None
  * @retval None
  */
void SystemClock_Config(void)
{
  RCC_ClkInitTypeDef RCC_ClkInitStruct;
  RCC_OscInitTypeDef RCC_OscInitStruct;
  
  /* Select HSI48 Oscillator as PLL source */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI48;
  RCC_OscInitStruct.HSI48State = RCC_HSI48_ON;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI48;
  RCC_OscInitStruct.PLL.PREDIV = RCC_PREDIV_DIV2;
  RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL2;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct)!= HAL_OK)
  {
    /* Initialization Error */
    while(1); 
  }

  /* Select PLL as system clock source and configure the HCLK and 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
  */
static void Error_Handler(void)
{
  while (1)
  {
    /* Error if LED2 is slowly blinking (1 sec. period) */
    BSP_LED_Toggle(LED2); 
    HAL_Delay(1000);   
  }

}

#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****/
