crc.c

包含了８位ＣＲＣ算化程序

/**************** (c) 2008 ***********************************************************/   
/*	FILE     : 		Crc.c															 */	
/*	DESCRIPTION:   	Generate 8bit CRC check code									 */
/*	COMPILER : 		compiler														 */	
/*	VERSION  :  	1.0																 */
/*	DATE	 : 		2008/2/20														 */			
/*	Authoer  : 		flydragon														 */			
/*************************************************************************************/
const unsigned char near CrcTable[] ={
0x00, 0x9b, 0xad, 0x36, 0xc1, 0x5a, 0x6c, 0xf7,

0x19, 0x82, 0xb4, 0x2f, 0xd8, 0x43, 0x75, 0xee,

0x32, 0xa9, 0x9f, 0x04, 0xf3, 0x68, 0x5e, 0xc5,

0x2b, 0xb0, 0x86, 0x1d, 0xea, 0x71, 0x47, 0xdc,

0x64, 0xff, 0xc9, 0x52, 0xa5, 0x3e, 0x08, 0x93,

0x7d, 0xe6, 0xd0, 0x4b, 0xbc, 0x27, 0x11, 0x8a,

0x56, 0xcd, 0xfb, 0x60, 0x97, 0x0c, 0x3a, 0xa1,

0x4f, 0xd4, 0xe2, 0x79, 0x8e, 0x15, 0x23, 0xb8,

0xc8, 0x53, 0x65, 0xfe, 0x09, 0x92, 0xa4, 0x3f,

0xd1, 0x4a, 0x7c, 0xe7, 0x10, 0x8b, 0xbd, 0x26,

0xfa, 0x61, 0x57, 0xcc, 0x3b, 0xa0, 0x96, 0x0d,

0xe3, 0x78, 0x4e, 0xd5, 0x22, 0xb9, 0x8f, 0x14,

0xac, 0x37, 0x01, 0x9a, 0x6d, 0xf6, 0xc0, 0x5b,

0xb5, 0x2e, 0x18, 0x83, 0x74, 0xef, 0xd9, 0x42,

0x9e, 0x05, 0x33, 0xa8, 0x5f, 0xc4, 0xf2, 0x69,

0x87, 0x1c, 0x2a, 0xb1, 0x46, 0xdd, 0xeb, 0x70,

0x0b, 0x90, 0xa6, 0x3d, 0xca, 0x51, 0x67, 0xfc,

0x12, 0x89, 0xbf, 0x24, 0xd3, 0x48, 0x7e, 0xe5,

0x39, 0xa2, 0x94, 0x0f, 0xf8, 0x63, 0x55, 0xce,

0x20, 0xbb, 0x8d, 0x16, 0xe1, 0x7a, 0x4c, 0xd7,

0x6f, 0xf4, 0xc2, 0x59, 0xae, 0x35, 0x03, 0x98,

0x76, 0xed, 0xdb, 0x40, 0xb7, 0x2c, 0x1a, 0x81,

0x5d, 0xc6, 0xf0, 0x6b, 0x9c, 0x07, 0x31, 0xaa,

0x44, 0xdf, 0xe9, 0x72, 0x85, 0x1e, 0x28, 0xb3,

0xc3, 0x58, 0x6e, 0xf5, 0x02, 0x99, 0xaf, 0x34,

0xda, 0x41, 0x77, 0xec, 0x1b, 0x80, 0xb6, 0x2d,

0xf1, 0x6a, 0x5c, 0xc7, 0x30, 0xab, 0x9d, 0x06,

0xe8, 0x73, 0x45, 0xde, 0x29, 0xb2, 0x84, 0x1f,

0xa7, 0x3c, 0x0a, 0x91, 0x66, 0xfd, 0xcb, 0x50,

0xbe, 0x25, 0x13, 0x88, 0x7f, 0xe4, 0xd2, 0x49,

0x95, 0x0e, 0x38, 0xa3, 0x54, 0xcf, 0xf9, 0x62,

0x8c, 0x17, 0x21, 0xba, 0x4d, 0xd6, 0xe0, 0x7b,
};

/**************************************************************************************
Function:		GenerateCRC8
Description:    Generate 8bit crc code
Arguments:		address		is data address
				len			is	data length
Returns:		8bit CRC data	
Notes:
****************************************************************************************/
unsigned char GenerateCRC8(unsigned char *address,unsigned char len)
{
	#ifndef DEBUG
	
	unsigned char oldcrc8;
	unsigned char crc8;
	unsigned char oldcrc;
	unsigned char counter;
	unsigned char x;
	unsigned char i;
	unsigned char *p;
	
	oldcrc8 = 0;
	counter = 0;
	i = len;
	p = address;
	
	while(i--)
		{
		x = oldcrc8;
		oldcrc = CrcTable[x];
		oldcrc8 = *(p + counter);
		oldcrc8 = oldcrc8 ^ oldcrc;
		counter ++;
				
		}
	crc8 = oldcrc8;
	
	return crc8;		
	
	#endif
}
/******2008/04/20*(c)****End of file*************************************************/