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[avr-libc-dev] [bug #37901] CRC-CCITT calculation incorrect

From: Joerg Wunsch
Subject: [avr-libc-dev] [bug #37901] CRC-CCITT calculation incorrect
Date: Tue, 11 Dec 2012 14:01:50 +0000
User-agent: Mozilla/5.0 (X11; Linux i686 on x86_64; rv:10.0.2) Gecko/20100101 Firefox/10.0.2

Update of bug #37901 (project avr-libc):

                  Status:                    None => Invalid                
             Assigned to:                    None => joerg_wunsch           
             Open/Closed:                    Open => Closed                 


Follow-up Comment #1:

The function you describe is provided by
_crc_xmodem_update() in <util/crc16.h>.  It uses
the same polynomial as _crc_ccitt_update()
(x^16 + x^12 + x^5 + 1), but the opposite bit order.

_crc_ccitt_update() is known to work well together with
typical communication protocols that transmit the low-order
bit first, e.g. IEEE 802.15.4.


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