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#define CRC_POLY 0x8408

unsigned int cal_crc(unsigned char *ptr, unsigned int len) 

{

unsigned int crc=0xffff;

unsigned char i;

while(len--)

{

crc^=*ptr++;

for(i=0;i<8;i++)

{

If (crc&0x0001)

{

crc >>= 1;

crc^= CRC_POLY; 

}

else 

{

crc >>= 1;

}

}

} 

crc ^= 0xffff;

return crc;