lib/main/STM32F1/Drivers/STM32F10x_StdPeriph_Driver/src/stm32f10x_crc.c

   1 /**
   2   ******************************************************************************
   3   * @file    stm32f10x_crc.c
   4   * @author  MCD Application Team
   5   * @version V3.5.0
   6   * @date    11-March-2011
   7   * @brief   This file provides all the CRC firmware functions.
   8   ******************************************************************************
   9   * @attention
  10   *
  11   * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
  12   * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
  13   * TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY
  14   * DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
  15   * FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
  16   * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
  17   *
  18   * <h2><center>&copy; COPYRIGHT 2011 STMicroelectronics</center></h2>
  19   ******************************************************************************
  20   */
  21
  22 /* Includes ------------------------------------------------------------------*/
  23 #include "stm32f10x_crc.h"
  24
  25 /** @addtogroup STM32F10x_StdPeriph_Driver
  26   * @{
  27   */
  28
  29 /** @defgroup CRC
  30   * @brief CRC driver modules
  31   * @{
  32   */
  33
  34 /** @defgroup CRC_Private_TypesDefinitions
  35   * @{
  36   */
  37
  38 /**
  39   * @}
  40   */
  41
  42 /** @defgroup CRC_Private_Defines
  43   * @{
  44   */
  45
  46 /**
  47   * @}
  48   */
  49
  50 /** @defgroup CRC_Private_Macros
  51   * @{
  52   */
  53
  54 /**
  55   * @}
  56   */
  57
  58 /** @defgroup CRC_Private_Variables
  59   * @{
  60   */
  61
  62 /**
  63   * @}
  64   */
  65
  66 /** @defgroup CRC_Private_FunctionPrototypes
  67   * @{
  68   */
  69
  70 /**
  71   * @}
  72   */
  73
  74 /** @defgroup CRC_Private_Functions
  75   * @{
  76   */
  77
  78 /**
  79   * @brief  Resets the CRC Data register (DR).
  80   * @param  None
  81   * @retval None
  82   */
  83 void CRC_ResetDR(void)
  84 {
  85   /* Reset CRC generator */
  86   CRC->CR = CRC_CR_RESET;
  87 }
  88
  89 /**
  90   * @brief  Computes the 32-bit CRC of a given data word(32-bit).
  91   * @param  Data: data word(32-bit) to compute its CRC
  92   * @retval 32-bit CRC
  93   */
  94 uint32_t CRC_CalcCRC(uint32_t Data)
  95 {
  96   CRC->DR = Data;
  97
  98   return (CRC->DR);
  99 }
 100
 101 /**
 102   * @brief  Computes the 32-bit CRC of a given buffer of data word(32-bit).
 103   * @param  pBuffer: pointer to the buffer containing the data to be computed
 104   * @param  BufferLength: length of the buffer to be computed
 105   * @retval 32-bit CRC
 106   */
 107 uint32_t CRC_CalcBlockCRC(uint32_t pBuffer[], uint32_t BufferLength)
 108 {
 109   uint32_t index = 0;
 110
 111   for(index = 0; index < BufferLength; index++)
 112   {
 113     CRC->DR = pBuffer[index];
 114   }
 115   return (CRC->DR);
 116 }
 117
 118 /**
 119   * @brief  Returns the current CRC value.
 120   * @param  None
 121   * @retval 32-bit CRC
 122   */
 123 uint32_t CRC_GetCRC(void)
 124 {
 125   return (CRC->DR);
 126 }
 127
 128 /**
 129   * @brief  Stores a 8-bit data in the Independent Data(ID) register.
 130   * @param  IDValue: 8-bit value to be stored in the ID register
 131   * @retval None
 132   */
 133 void CRC_SetIDRegister(uint8_t IDValue)
 134 {
 135   CRC->IDR = IDValue;
 136 }
 137
 138 /**
 139   * @brief  Returns the 8-bit data stored in the Independent Data(ID) register
 140   * @param  None
 141   * @retval 8-bit value of the ID register
 142   */
 143 uint8_t CRC_GetIDRegister(void)
 144 {
 145   return (CRC->IDR);
 146 }
 147
 148 /**
 149   * @}
 150   */
 151
 152 /**
 153   * @}
 154   */
 155
 156 /**
 157   * @}
 158   */
 159
 160 /******************* (C) COPYRIGHT 2011 STMicroelectronics *****END OF FILE****/