stm32lib/STM32F0xx_HAL_Driver/Src/stm32f0xx_ll_crc.c

/**
  ******************************************************************************
  * @file    stm32f0xx_ll_crc.c
  * @author  MCD Application Team
  * @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 "stm32f0xx_ll_crc.h"

#ifdef  USE_FULL_ASSERT
#include "stm32_assert.h"
#else
#define assert_param(expr) ((void)0U)
#endif

/** @addtogroup STM32F0xx_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)
  {
#if defined(CRC_PROG_POLYNOMIAL_SUPPORT)
    /* 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);
#endif

    /* 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****/