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/****************************************Copyright (c)**************************************************
** Guangzhou ZLG-MCU Development Co.,LTD.
** graduate school
** http://www.zlgmcu.com
**
**--------------File Info-------------------------------------------------------------------------------
** File name: sdtools.c
** Last modified Date: 2005-1-6
** Last Version: V1.0
** Descriptions: sd 卡驱动软件包: SD卡相关工具函数 ---- CRC校验
** Soft Packet of SD Card Driver: tool funcitons about sd card ---- crc check
**
**------------------------------------------------------------------------------------------------------
** Created by: Ming Yuan Zheng
** Created date: 2005-1-6
** Version: V1.0
** Descriptions: The original version
**
**------------------------------------------------------------------------------------------------------
** Modified by:
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*********************
** 函数名称: INT8U SD_GetCmdByte6() Name: INT8U SD_GetCmdByte6()
** 功能描述: 获取SD卡命令的CRC7 Function: get the CRC7 of the command of SD card
** 输 入: INT8U cmd : 命令 Input: INT8U cmd : command
INT8U *param: 命令的参数,长度为4字节 INT8U *param: the param of command,length is 4 bytes
** 输 出: CRC7码 Output: CRC7 code
********************************************************************************************************************/
INT8U SD_GetCmdByte6(INT8U cmd, INT8U *param)
{
INT8U i, j;
INT8U reg = 0;
INT8U array[5];
array[0] = cmd;
for (i = 1; i < 5; i++) /* 将参数的顺序重新排列 */
array[i] = param[4 - i];
for (i = 0; i < 5; i++) /* 计算5个字节的CRC7 */
{
for (j = 0; j < 8; j++)
{
reg <<= 1;
reg ^= ((((array[i] << j) ^ reg) & 0x80) ? 0x9 : 0);
}
}
return ((reg << 1) + 0x01) ; /* 计算结果的CRC7左移一位,并将最低位置1 */
}
#endif
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