I was searching through the PICLIST archive for a CRC-16
routine for a project but found nothing useful. The only
thing I found was a Dallas app note (#27) that uses a
linear method, no table lookup and no loops.

This translated well to PIC code. If there is still
an interest I'll post it to the list.

Here is a summary:

; CRC-16  (x^16+x^15+x^2+x^0)
; No tables, No loops, No temporary registers used.
;
; Input:  W = Data byte for CRC calculation
;         crc_hi:crc_lo 16 bit CRC register
;
; Output: crc_hi:crc_lo updated.
;
; 30 instructions, 31 machine cycles per byte.

Charles.