lib/main/STM32F3/Drivers/STM32F3xx_HAL_Driver/Src/stm32f3xx_ll_crc.c

   1 /**
   2   ******************************************************************************
   3   * @file    stm32f3xx_ll_crc.c
   4   * @author  MCD Application Team
   5   * @brief   CRC LL module driver.
   6   ******************************************************************************
   7   * @attention
   8   *
   9   * <h2><center>&copy; COPYRIGHT(c) 2016 STMicroelectronics</center></h2>
  10   *
  11   * Redistribution and use in source and binary forms, with or without modification,
  12   * are permitted provided that the following conditions are met:
  13   *   1. Redistributions of source code must retain the above copyright notice,
  14   *      this list of conditions and the following disclaimer.
  15   *   2. Redistributions in binary form must reproduce the above copyright notice,
  16   *      this list of conditions and the following disclaimer in the documentation
  17   *      and/or other materials provided with the distribution.
  18   *   3. Neither the name of STMicroelectronics nor the names of its contributors
  19   *      may be used to endorse or promote products derived from this software
  20   *      without specific prior written permission.
  21   *
  22   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  23   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  25   * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  26   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  28   * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  29   * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  31   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32   *
  33   ******************************************************************************
  34   */
  35 #if defined(USE_FULL_LL_DRIVER)
  36
  37 /* Includes ------------------------------------------------------------------*/
  38 #include "stm32f3xx_ll_crc.h"
  39
  40 #ifdef  USE_FULL_ASSERT
  41 #include "stm32_assert.h"
  42 #else
  43 #define assert_param(expr) ((void)0U)
  44 #endif
  45
  46 /** @addtogroup STM32F3xx_LL_Driver
  47   * @{
  48   */
  49
  50 #if defined (CRC)
  51
  52 /** @addtogroup CRC_LL
  53   * @{
  54   */
  55
  56 /* Private types -------------------------------------------------------------*/
  57 /* Private variables ---------------------------------------------------------*/
  58 /* Private constants ---------------------------------------------------------*/
  59 /* Private macros ------------------------------------------------------------*/
  60 /* Private function prototypes -----------------------------------------------*/
  61
  62 /* Exported functions --------------------------------------------------------*/
  63 /** @addtogroup CRC_LL_Exported_Functions
  64   * @{
  65   */
  66
  67 /** @addtogroup CRC_LL_EF_Init
  68   * @{
  69   */
  70
  71 /**
  72   * @brief  De-initialize CRC registers (Registers restored to their default values).
  73   * @param  CRCx CRC Instance
  74   * @retval An ErrorStatus enumeration value:
  75   *          - SUCCESS: CRC registers are de-initialized
  76   *          - ERROR: CRC registers are not de-initialized
  77   */
  78 ErrorStatus LL_CRC_DeInit(CRC_TypeDef *CRCx)
  79 {
  80   ErrorStatus status = SUCCESS;
  81
  82   /* Check the parameters */
  83   assert_param(IS_CRC_ALL_INSTANCE(CRCx));
  84
  85   if (CRCx == CRC)
  86   {
  87     /* Set programmable polynomial size in CR register to reset value (32 bits)*/
  88     LL_CRC_SetPolynomialSize(CRCx, LL_CRC_POLYLENGTH_32B);
  89
  90     /* Set programmable polynomial in POL register to reset value */
  91     LL_CRC_SetPolynomialCoef(CRCx, LL_CRC_DEFAULT_CRC32_POLY);
  92
  93     /* Set INIT register to reset value */
  94     LL_CRC_SetInitialData(CRCx, LL_CRC_DEFAULT_CRC_INITVALUE);
  95
  96     /* Set Reversibility options on I/O data values in CR register to reset value */
  97     LL_CRC_SetInputDataReverseMode(CRCx, LL_CRC_INDATA_REVERSE_NONE);
  98     LL_CRC_SetOutputDataReverseMode(CRCx, LL_CRC_OUTDATA_REVERSE_NONE);
  99
 100     /* Reset the CRC calculation unit */
 101     LL_CRC_ResetCRCCalculationUnit(CRCx);
 102
 103     /* Reset IDR register */
 104     LL_CRC_Write_IDR(CRCx, 0x00U);
 105   }
 106   else
 107   {
 108     status = ERROR;
 109   }
 110
 111   return (status);
 112 }
 113
 114 /**
 115   * @}
 116   */
 117
 118 /**
 119   * @}
 120   */
 121
 122 /**
 123   * @}
 124   */
 125
 126 #endif /* defined (CRC) */
 127
 128 /**
 129   * @}
 130   */
 131
 132 #endif /* USE_FULL_LL_DRIVER */
 133
 134 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
 135