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

From: Erik Walthinsen
Subject: Re: [avr-libc-dev] [bug #37901] CRC-CCITT calculation incorrect
Date: Tue, 11 Dec 2012 08:02:45 -0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:16.0) Gecko/20121011 Thunderbird/16.0.1

On 12/11/2012 07:50 AM, Weddington, Eric wrote:
We need to support the xmega users better. If they're getting easily confused, 
then we need to help.

It took me a while to discover that the Xmega "CCITT" wasn't the same as the avr-libc function, and yes, the difference between _xmodem and _ccitt isn't all that well described (esp if/since they're actually inverse of each other polynomial-wise). Plenty of trouble finding the right Python code to insert into my passive bus sniffer too. Not looking forward to figuring out CRC-32 re: the NVM, the CRC module, and python. That *should* be easier since they claim it's 802.3 and afaik crc32 is quite a bit more standardized, but...

The key for me was finding this page:


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