Control.com - Nerds in Control

This seems pretty straightforward. I typed it all in from memory, so if there are bugs, let me know.

Max<br>
superalpha@yahoo.com

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unsigned int CRC16;
#define SEED 0xFFFF  //initialization for CRC16
#define GP   0xA001  //generating polynomial

//for standard CRC16
//(remainder of division)
//to start a new CRC, set CRC16 = SEED
//then for each byte call Calc_CRC(byte, &CRC16);
//CRC16 will contain the result
//(if you calculate all of the incoming data
//INCLUDING the CRC, the result should be 0x0000
//and if you are sending the CRC be sure to
//send the bytes in the correct order)

void Calc_CRC(unsigned byte b, unsigned int* CRC)
{
   BOOL carry;
   int i;

   CRC[0] ^= b & 0xFF;
   for (i=0; i<8; i++)
   {
      carry = CRC[0] & 0x0001;
      CRC[0]>>=1;
      if (carry) CRC[0] ^= GP;
   }
}
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