Cirrus Logic AN194 - Manual (Page 4)

AN194
4 AN194REV1
}
return HashIndex;
} /* end of CalculateHashIndex() */
void updatecrc( int bit )
{
int j;
/* >> 1 the crc, use high bit (now CRC[32]) as control bit */
for (j = 32; j > 0; j--) CRC[j] = CRC[j - 1];
CRC[0] = 0;
/* if bit ^ (control bit) = 1, set CRC = CRC ^ polynomial */
if (bit ^ CRC[32])
{
for ( j = 0; j < 32; j++)
{
CRC[j] ^= crc_poly[j];
}
}
}