text: /**
    ******************************************************************************
    * @file    stm32f3xx_ll_crc.c
    * @author  MCD Application Team
    * @version V1.3.0
    * @date    01-July-2016
    * @brief   CRC LL module driver.
    ******************************************************************************
    * @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.
    *
    ******************************************************************************
    */
  #if defined(USE_FULL_LL_DRIVER)
  
  /* Includes ------------------------------------------------------------------*/
  #include "stm32f3xx_ll_crc.h"
  
  #ifdef  USE_FULL_ASSERT
  #include "stm32_assert.h"
  #else
  #define assert_param(expr) ((void)0U)
  #endif
  
  /** @addtogroup STM32F3xx_LL_Driver
    * @{
    */
  
  #if defined (CRC)
  
  /** @addtogroup CRC_LL
    * @{
    */
  
  /* Private types -------------------------------------------------------------*/
  /* Private variables ---------------------------------------------------------*/
  /* Private constants ---------------------------------------------------------*/
  /* Private macros ------------------------------------------------------------*/
  /* Private function prototypes -----------------------------------------------*/
  
  /* Exported functions --------------------------------------------------------*/
  /** @addtogroup CRC_LL_Exported_Functions
    * @{
    */
  
  /** @addtogroup CRC_LL_EF_Init
    * @{
    */
  
  /**
    * @brief  De-initialize CRC registers (Registers restored to their default values).
    * @param  CRCx CRC Instance
    * @retval An ErrorStatus enumeration value:
    *          - SUCCESS: CRC registers are de-initialized
    *          - ERROR: CRC registers are not de-initialized
    */
  ErrorStatus LL_CRC_DeInit(CRC_TypeDef *CRCx)
  {
    ErrorStatus status = SUCCESS;
  
    /* Check the parameters */
    assert_param(IS_CRC_ALL_INSTANCE(CRCx));
  
    if (CRCx == CRC)
    {
      /* Set programmable polynomial size in CR register to reset value (32 bits)*/
      LL_CRC_SetPolynomialSize(CRCx, LL_CRC_POLYLENGTH_32B);
  
      /* Set programmable polynomial in POL register to reset value */
      LL_CRC_SetPolynomialCoef(CRCx, LL_CRC_DEFAULT_CRC32_POLY);
  
      /* Set INIT register to reset value */
      LL_CRC_SetInitialData(CRCx, LL_CRC_DEFAULT_CRC_INITVALUE);
  
      /* Set Reversibility options on I/O data values in CR register to reset value */
      LL_CRC_SetInputDataReverseMode(CRCx, LL_CRC_INDATA_REVERSE_NONE);
      LL_CRC_SetOutputDataReverseMode(CRCx, LL_CRC_OUTDATA_REVERSE_NONE);
  
      /* Reset the CRC calculation unit */
      LL_CRC_ResetCRCCalculationUnit(CRCx);
  
      /* Reset IDR register */
      LL_CRC_Write_IDR(CRCx, 0x00U);
    }
    else
    {
      status = ERROR;
    }
  
    return (status);
  }
  
  /**
    * @}
    */
  
  /**
    * @}
    */
  
  /**
    * @}
    */
  
  #endif /* defined (CRC) */
  
  /**
    * @}
    */
  
  #endif /* USE_FULL_LL_DRIVER */
  
  /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
  
  