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2 mjames 1 
/**
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  ******************************************************************************
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  * @file    stm32f0xx_ll_crc.c
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  * @author  MCD Application Team
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  * @brief   CRC LL module driver.
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  ******************************************************************************
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  * @attention
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  *
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  * <h2><center>&copy; Copyright (c) 2016 STMicroelectronics.
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  * All rights reserved.</center></h2>
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  *
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  * This software component is licensed by ST under BSD 3-Clause license,
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  * the "License"; You may not use this file except in compliance with the
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  * License. You may obtain a copy of the License at:
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  *                        opensource.org/licenses/BSD-3-Clause
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  *
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  ******************************************************************************
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  */
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#if defined(USE_FULL_LL_DRIVER)
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/* Includes ------------------------------------------------------------------*/
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#include "stm32f0xx_ll_crc.h"
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#include "stm32f0xx_ll_bus.h"
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#ifdef  USE_FULL_ASSERT
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#include "stm32_assert.h"
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#else
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#define assert_param(expr) ((void)0U)
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#endif /* USE_FULL_ASSERT */
2 mjames 30 
 
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/** @addtogroup STM32F0xx_LL_Driver
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  * @{
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  */
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#if defined (CRC)
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/** @addtogroup CRC_LL
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  * @{
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  */
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/* Private types -------------------------------------------------------------*/
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/* Private variables ---------------------------------------------------------*/
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/* Private constants ---------------------------------------------------------*/
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/* Private macros ------------------------------------------------------------*/
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/* Private function prototypes -----------------------------------------------*/
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/* Exported functions --------------------------------------------------------*/
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/** @addtogroup CRC_LL_Exported_Functions
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  * @{
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  */
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/** @addtogroup CRC_LL_EF_Init
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  * @{
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  */
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/**
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  * @brief  De-initialize CRC registers (Registers restored to their default values).
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  * @param  CRCx CRC Instance
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  * @retval An ErrorStatus enumeration value:
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  *          - SUCCESS: CRC registers are de-initialized
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  *          - ERROR: CRC registers are not de-initialized
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  */
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ErrorStatus LL_CRC_DeInit(CRC_TypeDef *CRCx)
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{
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  ErrorStatus status = SUCCESS;
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  /* Check the parameters */
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  assert_param(IS_CRC_ALL_INSTANCE(CRCx));
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  if (CRCx == CRC)
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  {
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#if defined(CRC_POL_POL)
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    /* Set programmable polynomial size in CR register to reset value (32 bits)*/
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    LL_CRC_SetPolynomialSize(CRCx, LL_CRC_POLYLENGTH_32B);
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    /* Set programmable polynomial in POL register to reset value */
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    LL_CRC_SetPolynomialCoef(CRCx, LL_CRC_DEFAULT_CRC32_POLY);
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#endif /* CRC_POL_POL */
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    /* Set INIT register to reset value */
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    LL_CRC_SetInitialData(CRCx, LL_CRC_DEFAULT_CRC_INITVALUE);
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    /* Set Reversibility options on I/O data values in CR register to reset value */
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    LL_CRC_SetInputDataReverseMode(CRCx, LL_CRC_INDATA_REVERSE_NONE);
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    LL_CRC_SetOutputDataReverseMode(CRCx, LL_CRC_OUTDATA_REVERSE_NONE);
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    /* Reset the CRC calculation unit */
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    LL_CRC_ResetCRCCalculationUnit(CRCx);
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    /* Reset IDR register */
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    LL_CRC_Write_IDR(CRCx, 0x00U);
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  }
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  else
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  {
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    status = ERROR;
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  }
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  return (status);
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}
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/**
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  * @}
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  */
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/**
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  * @}
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  */
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/**
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  * @}
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  */
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#endif /* defined (CRC) */
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/**
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  * @}
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  */
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#endif /* USE_FULL_LL_DRIVER */
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/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
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