lib/main/STM32F4/Drivers/STM32F4xx_StdPeriph_Driver/src/stm32f4xx_crc.c

   1 /**
   2   ******************************************************************************
   3   * @file    stm32f4xx_crc.c
   4   * @author  MCD Application Team
   5   * @version V1.7.1
   6   * @date    20-May-2016
   7   * @brief   This file provides all the CRC firmware functions.
   8   ******************************************************************************
   9   * @attention
  10   *
  11   * <h2><center>&copy; COPYRIGHT 2016 STMicroelectronics</center></h2>
  12   *
  13   * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
  14   * You may not use this file except in compliance with the License.
  15   * You may obtain a copy of the License at:
  16   *
  17   *        http://www.st.com/software_license_agreement_liberty_v2
  18   *
  19   * Unless required by applicable law or agreed to in writing, software
  20   * distributed under the License is distributed on an "AS IS" BASIS,
  21   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  22   * See the License for the specific language governing permissions and
  23   * limitations under the License.
  24   *
  25   ******************************************************************************
  26   */
  27
  28 /* Includes ------------------------------------------------------------------*/
  29 #include "stm32f4xx_crc.h"
  30
  31 /** @addtogroup STM32F4xx_StdPeriph_Driver
  32   * @{
  33   */
  34
  35 /** @defgroup CRC
  36   * @brief CRC driver modules
  37   * @{
  38   */
  39
  40 /* Private typedef -----------------------------------------------------------*/
  41 /* Private define ------------------------------------------------------------*/
  42 /* Private macro -------------------------------------------------------------*/
  43 /* Private variables ---------------------------------------------------------*/
  44 /* Private function prototypes -----------------------------------------------*/
  45 /* Private functions ---------------------------------------------------------*/
  46
  47 /** @defgroup CRC_Private_Functions
  48   * @{
  49   */
  50
  51 /**
  52   * @brief  Resets the CRC Data register (DR).
  53   * @param  None
  54   * @retval None
  55   */
  56 void CRC_ResetDR(void)
  57 {
  58   /* Reset CRC generator */
  59   CRC->CR = CRC_CR_RESET;
  60 }
  61
  62 /**
  63   * @brief  Computes the 32-bit CRC of a given data word(32-bit).
  64   * @param  Data: data word(32-bit) to compute its CRC
  65   * @retval 32-bit CRC
  66   */
  67 uint32_t CRC_CalcCRC(uint32_t Data)
  68 {
  69   CRC->DR = Data;
  70
  71   return (CRC->DR);
  72 }
  73
  74 /**
  75   * @brief  Computes the 32-bit CRC of a given buffer of data word(32-bit).
  76   * @param  pBuffer: pointer to the buffer containing the data to be computed
  77   * @param  BufferLength: length of the buffer to be computed
  78   * @retval 32-bit CRC
  79   */
  80 uint32_t CRC_CalcBlockCRC(uint32_t pBuffer[], uint32_t BufferLength)
  81 {
  82   uint32_t index = 0;
  83
  84   for(index = 0; index < BufferLength; index++)
  85   {
  86     CRC->DR = pBuffer[index];
  87   }
  88   return (CRC->DR);
  89 }
  90
  91 /**
  92   * @brief  Returns the current CRC value.
  93   * @param  None
  94   * @retval 32-bit CRC
  95   */
  96 uint32_t CRC_GetCRC(void)
  97 {
  98   return (CRC->DR);
  99 }
 100
 101 /**
 102   * @brief  Stores a 8-bit data in the Independent Data(ID) register.
 103   * @param  IDValue: 8-bit value to be stored in the ID register
 104   * @retval None
 105   */
 106 void CRC_SetIDRegister(uint8_t IDValue)
 107 {
 108   CRC->IDR = IDValue;
 109 }
 110
 111 /**
 112   * @brief  Returns the 8-bit data stored in the Independent Data(ID) register
 113   * @param  None
 114   * @retval 8-bit value of the ID register
 115   */
 116 uint8_t CRC_GetIDRegister(void)
 117 {
 118   return (CRC->IDR);
 119 }
 120
 121 /**
 122   * @}
 123   */
 124
 125 /**
 126   * @}
 127   */
 128
 129 /**
 130   * @}
 131   */
 132
 133 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/