CRC Check 2's Compliment

Don't suppose anyone has written a CRC error check using 2's compliment in BASIC for use with TI 505-7101 BASIC Programming Module.. if this even sounds remotely familiar drop me a line, and i will touch base with you with more details. Cheers. J

MACCI said:

Don't suppose anyone has written a CRC error check using 2's compliment in BASIC for use with TI 505-7101 BASIC Programming Module.. if this even sounds remotely familiar drop me a line, and i will touch base with you with more details. Cheers. J

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The one that I think that you want is CRCC-CCITT (or CRC-CCITT) based on:
http://www.sea.siemens.com/autogen/docs/plc/505/manuals/560-8107-3.pdf


The poly that your would then want would be X16 + X12 + X5 + 1 (1021h):
http://www.aacomsystems.com/CC8110.pdf


Theory:
http://www.bbc.co.uk/rd/pubs/reports/1981-04.pdf
http://www.altera.com/literature/an/an049.pdf


Walk-through example:
http://www.joegeluso.com/software/articles/ccitt.htm


Example using a lookup table:
http://home.att.net/~jackklein/C_Unleashed/crcccitt.c


Short example (which crashed my browser. Drat, should have been doing this in Konq):
http://www.eagleairaust.com.au/code/crc16.htm


Pascal anyone? (for the Mac no less):
http://www.mactech.com/articles/mactech/Vol.09/09.04/CRC/


Forth? Ok, it's late:
http://www.forth-ev.de/VDimWeb/VD_0498/page17.htm


Try before you buy:
http://rcswww.urz.tu-dresden.de/~sr21/crc.html


On your own:
http://www.google.com/search?q=crc+ccitt&hl=en&lr=lang_en&ie=UTF-8&oe=UTF-8&start=10&sa=N


Enjoy,


John