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/**

  ******************************************************************************

  * @file    stm32f0xx_hal_crc.c

  * @author  MCD Application Team

  * @brief   CRC HAL module driver.

  *          This file provides firmware functions to manage the following

  *          functionalities of the Cyclic Redundancy Check (CRC) peripheral:

  *           + Initialization and de-initialization functions

  *           + Peripheral Control functions

  *           + Peripheral State functions

  *

  @verbatim

 ===============================================================================

                     ##### How to use this driver #####

 ===============================================================================

    [..]

         (+) Enable CRC AHB clock using __HAL_RCC_CRC_CLK_ENABLE();

         (+) Initialize CRC calculator

             (++) specify generating polynomial (peripheral default or non-default one)

             (++) specify initialization value (peripheral default or non-default one)

             (++) specify input data format

             (++) specify input or output data inversion mode if any

         (+) Use HAL_CRC_Accumulate() function to compute the CRC value of the

             input data buffer starting with the previously computed CRC as

             initialization value

         (+) Use HAL_CRC_Calculate() function to compute the CRC value of the

             input data buffer starting with the defined initialization value

             (default or non-default) to initiate CRC calculation

  @endverbatim

  ******************************************************************************

  * @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 "stm32f0xx_hal.h"

/** @addtogroup STM32F0xx_HAL_Driver

  * @{

  */

/** @defgroup CRC CRC

  * @brief CRC HAL module driver.

  * @{

  */

#ifdef HAL_CRC_MODULE_ENABLED

/* Private typedef -----------------------------------------------------------*/

/* Private define ------------------------------------------------------------*/

/* Private macro -------------------------------------------------------------*/

/* Private variables ---------------------------------------------------------*/

/* Private function prototypes -----------------------------------------------*/

/** @defgroup CRC_Private_Functions CRC Private Functions

  * @{

  */

static uint32_t CRC_Handle_8(CRC_HandleTypeDef *hcrc, uint8_t pBuffer[], uint32_t BufferLength);

static uint32_t CRC_Handle_16(CRC_HandleTypeDef *hcrc, uint16_t pBuffer[], uint32_t BufferLength);

/**

  * @}

  */

/* Exported functions --------------------------------------------------------*/

/** @defgroup CRC_Exported_Functions CRC Exported Functions

  * @{

  */

/** @defgroup CRC_Exported_Functions_Group1 Initialization and de-initialization functions

  *  @brief    Initialization and Configuration functions.

  *

@verbatim

 ===============================================================================

            ##### Initialization and de-initialization functions #####

 ===============================================================================

    [..]  This section provides functions allowing to:

      (+) Initialize the CRC according to the specified parameters

          in the CRC_InitTypeDef and create the associated handle

      (+) DeInitialize the CRC peripheral

      (+) Initialize the CRC MSP (MCU Specific Package)

      (+) DeInitialize the CRC MSP

@endverbatim

  * @{

  */

/**

  * @brief  Initialize the CRC according to the specified

  *         parameters in the CRC_InitTypeDef and create the associated handle.

  * @param  hcrc CRC handle

  * @retval HAL status

  */

HAL_StatusTypeDef HAL_CRC_Init(CRC_HandleTypeDef *hcrc)

{

  /* Check the CRC handle allocation */

  if (hcrc == NULL)

  {

    return HAL_ERROR;

  }

  /* Check the parameters */

  assert_param(IS_CRC_ALL_INSTANCE(hcrc->Instance));

  if (hcrc->State == HAL_CRC_STATE_RESET)

  {

    /* Allocate lock resource and initialize it */

    hcrc->Lock = HAL_UNLOCKED;

    /* Init the low level hardware */

    HAL_CRC_MspInit(hcrc);

  }

  hcrc->State = HAL_CRC_STATE_BUSY;

#if defined(CRC_POL_POL)

  /* check whether or not non-default generating polynomial has been

   * picked up by user */

  assert_param(IS_DEFAULT_POLYNOMIAL(hcrc->Init.DefaultPolynomialUse));

  if (hcrc->Init.DefaultPolynomialUse == DEFAULT_POLYNOMIAL_ENABLE)

  {

    /* initialize peripheral with default generating polynomial */

    WRITE_REG(hcrc->Instance->POL, DEFAULT_CRC32_POLY);

    MODIFY_REG(hcrc->Instance->CR, CRC_CR_POLYSIZE, CRC_POLYLENGTH_32B);

  }

  else

  {

    /* initialize CRC peripheral with generating polynomial defined by user */

    if (HAL_CRCEx_Polynomial_Set(hcrc, hcrc->Init.GeneratingPolynomial, hcrc->Init.CRCLength) != HAL_OK)

    {

      return HAL_ERROR;

    }

  }

#endif /* CRC_POL_POL */

  /* check whether or not non-default CRC initial value has been

   * picked up by user */

  assert_param(IS_DEFAULT_INIT_VALUE(hcrc->Init.DefaultInitValueUse));

  if (hcrc->Init.DefaultInitValueUse == DEFAULT_INIT_VALUE_ENABLE)

  {

    WRITE_REG(hcrc->Instance->INIT, DEFAULT_CRC_INITVALUE);

  }

  else

  {

    WRITE_REG(hcrc->Instance->INIT, hcrc->Init.InitValue);

  }

  /* set input data inversion mode */

  assert_param(IS_CRC_INPUTDATA_INVERSION_MODE(hcrc->Init.InputDataInversionMode));

  MODIFY_REG(hcrc->Instance->CR, CRC_CR_REV_IN, hcrc->Init.InputDataInversionMode);

  /* set output data inversion mode */

  assert_param(IS_CRC_OUTPUTDATA_INVERSION_MODE(hcrc->Init.OutputDataInversionMode));

  MODIFY_REG(hcrc->Instance->CR, CRC_CR_REV_OUT, hcrc->Init.OutputDataInversionMode);

  /* makes sure the input data format (bytes, halfwords or words stream)

   * is properly specified by user */

  assert_param(IS_CRC_INPUTDATA_FORMAT(hcrc->InputDataFormat));

  /* Change CRC peripheral state */

  hcrc->State = HAL_CRC_STATE_READY;

  /* Return function status */

  return HAL_OK;

}

/**

  * @brief  DeInitialize the CRC peripheral.

  * @param  hcrc CRC handle

  * @retval HAL status

  */

HAL_StatusTypeDef HAL_CRC_DeInit(CRC_HandleTypeDef *hcrc)

{

  /* Check the CRC handle allocation */

  if (hcrc == NULL)

  {

    return HAL_ERROR;

  }

  /* Check the parameters */

  assert_param(IS_CRC_ALL_INSTANCE(hcrc->Instance));

  /* Check the CRC peripheral state */

  if (hcrc->State == HAL_CRC_STATE_BUSY)

  {

    return HAL_BUSY;

  }

  /* Change CRC peripheral state */

  hcrc->State = HAL_CRC_STATE_BUSY;

  /* Reset CRC calculation unit */

  __HAL_CRC_DR_RESET(hcrc);

  /* Reset IDR register content */

  CLEAR_BIT(hcrc->Instance->IDR, CRC_IDR_IDR);

  /* DeInit the low level hardware */

  HAL_CRC_MspDeInit(hcrc);

  /* Change CRC peripheral state */

  hcrc->State = HAL_CRC_STATE_RESET;

  /* Process unlocked */

  __HAL_UNLOCK(hcrc);

  /* Return function status */

  return HAL_OK;

}

/**

  * @brief  Initializes the CRC MSP.

  * @param  hcrc CRC handle

  * @retval None

  */

__weak void HAL_CRC_MspInit(CRC_HandleTypeDef *hcrc)

{

  /* Prevent unused argument(s) compilation warning */

  UNUSED(hcrc);

  /* NOTE : This function should not be modified, when the callback is needed,

            the HAL_CRC_MspInit can be implemented in the user file

   */

}

/**

  * @brief  DeInitialize the CRC MSP.

  * @param  hcrc CRC handle

  * @retval None

  */

__weak void HAL_CRC_MspDeInit(CRC_HandleTypeDef *hcrc)

{

  /* Prevent unused argument(s) compilation warning */

  UNUSED(hcrc);

  /* NOTE : This function should not be modified, when the callback is needed,

            the HAL_CRC_MspDeInit can be implemented in the user file

   */

}

/**

  * @}

  */

/** @defgroup CRC_Exported_Functions_Group2 Peripheral Control functions

  *  @brief    management functions.

  *

@verbatim

 ===============================================================================

                      ##### Peripheral Control functions #####

 ===============================================================================

    [..]  This section provides functions allowing to:

      (+) compute the 7, 8, 16 or 32-bit CRC value of an 8, 16 or 32-bit data buffer

          using combination of the previous CRC value and the new one.

       [..]  or

      (+) compute the 7, 8, 16 or 32-bit CRC value of an 8, 16 or 32-bit data buffer

          independently of the previous CRC value.

@endverbatim

  * @{

  */

/**

  * @brief  Compute the 7, 8, 16 or 32-bit CRC value of an 8, 16 or 32-bit data buffer

  *         starting with the previously computed CRC as initialization value.

  * @param  hcrc CRC handle

  * @param  pBuffer pointer to the input data buffer, exact input data format is

  *         provided by hcrc->InputDataFormat.

  * @param  BufferLength input data buffer length (number of bytes if pBuffer

  *         type is * uint8_t, number of half-words if pBuffer type is * uint16_t,

  *         number of words if pBuffer type is * uint32_t).

  * @note  By default, the API expects a uint32_t pointer as input buffer parameter.

  *        Input buffer pointers with other types simply need to be cast in uint32_t

  *        and the API will internally adjust its input data processing based on the

  *        handle field hcrc->InputDataFormat.

  * @retval uint32_t CRC (returned value LSBs for CRC shorter than 32 bits)

  */

uint32_t HAL_CRC_Accumulate(CRC_HandleTypeDef *hcrc, uint32_t pBuffer[], uint32_t BufferLength)

{

  uint32_t index;      /* CRC input data buffer index */

  uint32_t temp = 0U;  /* CRC output (read from hcrc->Instance->DR register) */

  /* Change CRC peripheral state */

  hcrc->State = HAL_CRC_STATE_BUSY;

  switch (hcrc->InputDataFormat)

  {

    case CRC_INPUTDATA_FORMAT_WORDS:

      /* Enter Data to the CRC calculator */

      for (index = 0U; index < BufferLength; index++)

      {

        hcrc->Instance->DR = pBuffer[index];

      }

      temp = hcrc->Instance->DR;

      break;

    case CRC_INPUTDATA_FORMAT_BYTES:

      temp = CRC_Handle_8(hcrc, (uint8_t *)pBuffer, BufferLength);

      break;

    case CRC_INPUTDATA_FORMAT_HALFWORDS:

      temp = CRC_Handle_16(hcrc, (uint16_t *)(void *)pBuffer, BufferLength);    /* Derogation MisraC2012 R.11.5 */

      break;

    default:

      break;

  }

  /* Change CRC peripheral state */

  hcrc->State = HAL_CRC_STATE_READY;

  /* Return the CRC computed value */

  return temp;

}

/**

  * @brief  Compute the 7, 8, 16 or 32-bit CRC value of an 8, 16 or 32-bit data buffer

  *         starting with hcrc->Instance->INIT as initialization value.

  * @param  hcrc CRC handle

  * @param  pBuffer pointer to the input data buffer, exact input data format is

  *         provided by hcrc->InputDataFormat.

  * @param  BufferLength input data buffer length (number of bytes if pBuffer

  *         type is * uint8_t, number of half-words if pBuffer type is * uint16_t,

  *         number of words if pBuffer type is * uint32_t).

  * @note  By default, the API expects a uint32_t pointer as input buffer parameter.

  *        Input buffer pointers with other types simply need to be cast in uint32_t

  *        and the API will internally adjust its input data processing based on the

  *        handle field hcrc->InputDataFormat.

  * @retval uint32_t CRC (returned value LSBs for CRC shorter than 32 bits)

  */

uint32_t HAL_CRC_Calculate(CRC_HandleTypeDef *hcrc, uint32_t pBuffer[], uint32_t BufferLength)

{

  uint32_t index;      /* CRC input data buffer index */

  uint32_t temp = 0U;  /* CRC output (read from hcrc->Instance->DR register) */

  /* Change CRC peripheral state */

  hcrc->State = HAL_CRC_STATE_BUSY;

  /* Reset CRC Calculation Unit (hcrc->Instance->INIT is

  *  written in hcrc->Instance->DR) */

  __HAL_CRC_DR_RESET(hcrc);

  switch (hcrc->InputDataFormat)

  {

    case CRC_INPUTDATA_FORMAT_WORDS:

      /* Enter 32-bit input data to the CRC calculator */

      for (index = 0U; index < BufferLength; index++)

      {

        hcrc->Instance->DR = pBuffer[index];

      }

      temp = hcrc->Instance->DR;

      break;

    case CRC_INPUTDATA_FORMAT_BYTES:

      /* Specific 8-bit input data handling  */

      temp = CRC_Handle_8(hcrc, (uint8_t *)pBuffer, BufferLength);

      break;

    case CRC_INPUTDATA_FORMAT_HALFWORDS:

      /* Specific 16-bit input data handling  */

      temp = CRC_Handle_16(hcrc, (uint16_t *)(void *)pBuffer, BufferLength);    /* Derogation MisraC2012 R.11.5 */

      break;

    default:

      break;

  }

  /* Change CRC peripheral state */

  hcrc->State = HAL_CRC_STATE_READY;

  /* Return the CRC computed value */

  return temp;

}

/**

  * @}

  */

/** @defgroup CRC_Exported_Functions_Group3 Peripheral State functions

  *  @brief    Peripheral State functions.

  *

@verbatim

 ===============================================================================

                      ##### Peripheral State functions #####

 ===============================================================================

    [..]

    This subsection permits to get in run-time the status of the peripheral.

@endverbatim

  * @{

  */

/**

  * @brief  Return the CRC handle state.

  * @param  hcrc CRC handle

  * @retval HAL state

  */

HAL_CRC_StateTypeDef HAL_CRC_GetState(CRC_HandleTypeDef *hcrc)

{

  /* Return CRC handle state */

  return hcrc->State;

}

/**

  * @}

  */

/**

  * @}

  */

/** @addtogroup CRC_Private_Functions

  * @{

  */

/**

  * @brief  Enter 8-bit input data to the CRC calculator.

  *         Specific data handling to optimize processing time.

  * @param  hcrc CRC handle

  * @param  pBuffer pointer to the input data buffer

  * @param  BufferLength input data buffer length

  * @retval uint32_t CRC (returned value LSBs for CRC shorter than 32 bits)

  */

static uint32_t CRC_Handle_8(CRC_HandleTypeDef *hcrc, uint8_t pBuffer[], uint32_t BufferLength)

{

  uint32_t i; /* input data buffer index */

  uint16_t data;

  __IO uint16_t *pReg;

  /* Processing time optimization: 4 bytes are entered in a row with a single word write,

   * last bytes must be carefully fed to the CRC calculator to ensure a correct type

   * handling by the peripheral */

  for (i = 0U; i < (BufferLength / 4U); i++)

  {

    hcrc->Instance->DR = ((uint32_t)pBuffer[4U * i] << 24U) | \

                         ((uint32_t)pBuffer[(4U * i) + 1U] << 16U) | \

                         ((uint32_t)pBuffer[(4U * i) + 2U] << 8U)  | \

                         (uint32_t)pBuffer[(4U * i) + 3U];

  }

  /* last bytes specific handling */

  if ((BufferLength % 4U) != 0U)

  {

    if ((BufferLength % 4U) == 1U)

    {

      *(__IO uint8_t *)(__IO void *)(&hcrc->Instance->DR) = pBuffer[4U * i];         /* Derogation MisraC2012 R.11.5 */

    }

    if ((BufferLength % 4U) == 2U)

    {

      data = ((uint16_t)(pBuffer[4U * i]) << 8U) | (uint16_t)pBuffer[(4U * i) + 1U];

      pReg = (__IO uint16_t *)(__IO void *)(&hcrc->Instance->DR);                    /* Derogation MisraC2012 R.11.5 */

      *pReg = data;

    }

    if ((BufferLength % 4U) == 3U)

    {

      data = ((uint16_t)(pBuffer[4U * i]) << 8U) | (uint16_t)pBuffer[(4U * i) + 1U];

      pReg = (__IO uint16_t *)(__IO void *)(&hcrc->Instance->DR);                    /* Derogation MisraC2012 R.11.5 */

      *pReg = data;

      *(__IO uint8_t *)(__IO void *)(&hcrc->Instance->DR) = pBuffer[(4U * i) + 2U];  /* Derogation MisraC2012 R.11.5 */

    }

  }

  /* Return the CRC computed value */

  return hcrc->Instance->DR;

}

/**

  * @brief  Enter 16-bit input data to the CRC calculator.

  *         Specific data handling to optimize processing time.

  * @param  hcrc CRC handle

  * @param  pBuffer pointer to the input data buffer

  * @param  BufferLength input data buffer length

  * @retval uint32_t CRC (returned value LSBs for CRC shorter than 32 bits)

  */

static uint32_t CRC_Handle_16(CRC_HandleTypeDef *hcrc, uint16_t pBuffer[], uint32_t BufferLength)

{

  uint32_t i;  /* input data buffer index */

  __IO uint16_t *pReg;

  /* Processing time optimization: 2 HalfWords are entered in a row with a single word write,

   * in case of odd length, last HalfWord must be carefully fed to the CRC calculator to ensure

   * a correct type handling by the peripheral */

  for (i = 0U; i < (BufferLength / 2U); i++)

  {

    hcrc->Instance->DR = ((uint32_t)pBuffer[2U * i] << 16U) | (uint32_t)pBuffer[(2U * i) + 1U];

  }

  if ((BufferLength % 2U) != 0U)

  {

    pReg = (__IO uint16_t *)(__IO void *)(&hcrc->Instance->DR);                 /* Derogation MisraC2012 R.11.5 */

    *pReg = pBuffer[2U * i];

  }

  /* Return the CRC computed value */

  return hcrc->Instance->DR;

}

/**

  * @}

  */

#endif /* HAL_CRC_MODULE_ENABLED */

/**

  * @}

  */

/**

  * @}

  */

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