www.pudn.com > c8051f020上实现的CRC.rar > CRC.#1

#include 
#include 
#define crc_model 0x1021l 
#define crc_byte 0x8000l 
#define last_byte  2 
idata unsigned short crc_variable; 
idata unsigned short crc_store; 
void crc(int adata) 
{ 
   int k; 
   int crc_temp; 
   char mark; 
   int rchar; 
   rchar=adata; 
   crc_temp=crc_variable; 
   for(k=0;k<8;k++) 
   {    
        if(crc_temp&crc_byte) 
		mark=1; 
		crc_temp<<=1; 
		if(rchar&0x80) 
		crc_temp++; 
		rchar<<=1; 
		if(mark==1) 
		crc_temp^=crc_model; 
   } 
   crc_variable=crc_temp; 
} 
 
void main(void) 
{ 
    int i; 
	int j; 
	int k=0; 
    int a[300]; 
	for(i=0;i<256;i++) 
	{  
	  crc_variable=0; 
      a[i]=i; 
	  crc(a[i]); 
      for( j=0;j