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/****************************************Copyright (c)************************************************** 
**                               Guangzhou ZLG-MCU Development Co.,LTD. 
**                                      graduate school 
**                                 http://www.zlgmcu.com 
** 
**--------------File Info------------------------------------------------------------------------------- 
** File name:			sdcrc.h 
** Last modified Date:	2005-3-11 
** Last Version:		V2.0 
** Descriptions:		SD/MMC卡读写模块: 相关工具函数 ---- CRC校验头文件 
**						Soft Packet of SD/MMC Card: tool funcitons  ---- crc check header file 
** 
**------------------------------------------------------------------------------------------------------ 
** Created by:			Ming Yuan Zheng 
** Created date:		2005-1-6 
** Version:				V1.0 
** Descriptions:		The original version 
** 
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extern INT16U SD_GetCRC16(INT8U *pSource,INT16U len);	//得到len个字节的CRC16 
 
extern INT8U SD_GetCmdByte6(INT8U cmd,INT8U *param);	//得到SD命令的第6个字节: CRC7 + 停止位1 
 
extern INT8U SD_GetCRC7(INT8U *pSource,INT16U len);		//得到len个字节的CRC7