bd76439fd2
git-svn-id: https://rt-thread.googlecode.com/svn/trunk@14 bbd45198-f89e-11dd-88c7-29a3b14d5316
115 lines
4.5 KiB
C
115 lines
4.5 KiB
C
/******************** (C) COPYRIGHT 2008 STMicroelectronics ********************
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* File Name : stm32f10x_crc.c
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* Author : MCD Application Team
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* Version : V2.0.3
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* Date : 09/22/2008
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* Description : This file provides all the CRC firmware functions.
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********************************************************************************
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* THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
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* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME.
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* AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY DIRECT,
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* INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE
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* CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING
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* INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
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*******************************************************************************/
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/* Includes ------------------------------------------------------------------*/
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#include "stm32f10x_crc.h"
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/* Private typedef -----------------------------------------------------------*/
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/* Private define ------------------------------------------------------------*/
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/* CR register bit mask */
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#define CR_RESET_Set ((u32)0x00000001)
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/* Private macro -------------------------------------------------------------*/
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/* Private variables ---------------------------------------------------------*/
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/* Private function prototypes -----------------------------------------------*/
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/* Private functions ---------------------------------------------------------*/
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/*******************************************************************************
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* Function Name : CRC_ResetDR
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* Description : Resets the CRC Data register (DR).
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* Input : None
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* Output : None
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* Return : None
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*******************************************************************************/
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void CRC_ResetDR(void)
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{
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/* Reset CRC generator */
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CRC->CR = CR_RESET_Set;
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}
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/*******************************************************************************
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* Function Name : CRC_CalcCRC
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* Description : Computes the 32-bit CRC of a given data word(32-bit).
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* Input : - Data: data word(32-bit) to compute its CRC
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* Output : None
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* Return : 32-bit CRC
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*******************************************************************************/
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u32 CRC_CalcCRC(u32 Data)
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{
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CRC->DR = Data;
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return (CRC->DR);
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}
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/*******************************************************************************
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* Function Name : CRC_CalcBlockCRC
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* Description : Computes the 32-bit CRC of a given buffer of data word(32-bit).
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* Input : - pBuffer: pointer to the buffer containing the data to be
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* computed
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* - BufferLength: length of the buffer to be computed
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* Output : None
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* Return : 32-bit CRC
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*******************************************************************************/
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u32 CRC_CalcBlockCRC(u32 pBuffer[], u32 BufferLength)
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{
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u32 index = 0;
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for(index = 0; index < BufferLength; index++)
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{
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CRC->DR = pBuffer[index];
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}
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return (CRC->DR);
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}
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/*******************************************************************************
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* Function Name : CRC_GetCRC
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* Description : Returns the current CRC value.
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* Input : None
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* Output : None
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* Return : 32-bit CRC
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*******************************************************************************/
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u32 CRC_GetCRC(void)
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{
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return (CRC->DR);
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}
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/*******************************************************************************
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* Function Name : CRC_SetIDRegister
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* Description : Stores a 8-bit data in the Independent Data(ID) register.
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* Input : - IDValue: 8-bit value to be stored in the ID register
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* Output : None
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* Return : None
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*******************************************************************************/
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void CRC_SetIDRegister(u8 IDValue)
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{
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CRC->IDR = IDValue;
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}
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/*******************************************************************************
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* Function Name : CRC_GetIDRegister
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* Description : Returns the 8-bit data stored in the Independent Data(ID) register
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* Input : None
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* Output : None
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* Return : 8-bit value of the ID register
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*******************************************************************************/
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u8 CRC_GetIDRegister(void)
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{
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return (CRC->IDR);
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}
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/******************* (C) COPYRIGHT 2008 STMicroelectronics *****END OF FILE****/
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