User Manual

7 Appendix
7.1 8-Bit CRC Algorithm
// 8 bits crc calculation. Initial value is 0.
// polynomial = X
8
+ X
5
+ X
4
+ 1
// data is an 8 bit number; crc is a 8 bit number
unsigned char eight_bit_crc(unsigned char crc, unsigned char data)
{ unsigned char index; // shift counter
unsigned char fb;
index = 8; // initialise the shift counter
do
{ fb = (crc ^ data) & 0x01;
data >>= 1;
crc >>= 1;
If(fb)
{ crc ^= 0x8c;
}
} while(--index);
return crc;
}
A CRC calculator for Windows is available free of charge from Quantum Research.
lQ 26 QT60248-AS R4.02/0405