crc8.c

一个循冗余校验的程序

#include<reg52.h>

#define	byte	unsigned	char	
#define	word	unsigned	int		

//code	byte	CRCC[8] = {0x28,0xca,0x4e,0xfa,0x00,0x00,0x00,0x6f};
//code	byte	CRCC[8] = {0x28,0x5b,0x1a,0x21,0x00,0x00,0x00,0xf6};
code	byte	CRC[8] = {0x28,0xd8,0x53,0x5a,0x00,0x00,0x00,0x63};

//data	byte	crc;	

byte	crc8(byte	*Index,byte	len)
{
	byte	i,j;
	byte	crc = 0x00;
	for(i = 0;i < len-1;i++)
	{
		crc = crc^Index[i];
		for(j = 0;j < 8;j++)
		{
		 	if(crc & 0x01)	crc = (crc >> 1)^0x8c;
			else	crc = crc>>1;
		}
	}
	if(crc == Index[7])		return 1;
	else	return	0;
}

void	main(void)
{	
	byte	result;	   
	
	P1 = 0x00;
	result = crc8(CRC,8); 
	if(result)	P1 = 0x01;
	while(1);		

}