Here's a CRC-16 implementation from my web page (http://home.netcom.com/~fastfwd/answers.html#PIC00076):
This isn't the fastest possible implementation, but it should be quick enough for most purposes. It uses the standard X.25 (and XMODEM) polynomial: x^16+x^12+x^5+1.
CRCHI EQU some register CRCLO EQU another register CLRF CRCHI CLRF CRCLO ;Append 16 "0" bits to your message here. LOOP: ;If there are no more bits in your message, go to ;"DONE". Otherwise, left-shift the next bit of your ;message into the carry here. RLF CRCLO RLF CRCHI SKPC ;X^16 GOTO LOOP MOVLW 00010000B ;X^12 XORWF CRCHI ; MOVLW 00100001B ;X^5 + 1 XORWF CRCLO ; GOTO LOOP DONE: ;The CRC is in "CRCHI" and "CRCLO".
|file: /Techref/microchip/crc16-aw.htm, 1KB, , updated: 2000/12/8 11:13, local time: 2018/1/17 10:22,
|©2018 These pages are served without commercial sponsorship. (No popup ads, etc...).Bandwidth abuse increases hosting cost forcing sponsorship or shutdown. This server aggressively defends against automated copying for any reason including offline viewing, duplication, etc... Please respect this requirement and DO NOT RIP THIS SITE. Questions?|
<A HREF="http://www.piclist.com/techref/microchip/crc16-aw.htm"> PIC Microcontroller Bit Math Method - CRC16</A>
|Did you find what you needed?|
PICList 2018 contributors:
o List host: MIT, Site host massmind.org, Top posters @20180117
* Page Editors: James Newton, David Cary, and YOU!
* Roman Black of Black Robotics donates from sales of Linistep stepper controller kits.
* Ashley Roll of Digital Nemesis donates from sales of RCL-1 RS232 to TTL converters.
* Monthly Subscribers: Gregg Rew. on-going support is MOST appreciated!
* Contributors: Richard Seriani, Sr.
Welcome to www.piclist.com!