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#define CRC_POLYNOM16 0x1021
unsigned int crc_16(unsigned int crc,
unsigned char *msg,
unsigned char msg_len)
{
unsigned char i=0;
while(msg_len-- >0)
{
crc = crc^ (unsigned int) *msg++<<8;
for(i=0;i<8;i++)
{
if(crc & 0x8000)
{
crc^=CRC_POLYNOM16;
crc<<=1;
}
else
{
crc<<=1;
}
}
}
return (crc & 0xFFFF);
}
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