Собстенно сабж.
Заранее спасибо.

unsigned char Crc8(unsigned char *pcBlock, unsigned char len)
{
unsigned char crc =0;
unsigned char fb, data;
unsigned char POL=0x18;

while (len--)
{
data =*pcBlock++;

fb =crc;
for (unsigned char i=0; i<8; i++)
{
fb =(crc ^ data)&0x01;
if(fb == 0x01)
crc=crc^POL;
crc=(crc>>1)&0x7F;
if (fb == 0x01)
crc=crc|0x80;
data=data>>1;
}
}
return crc;
}