Thanks for all the replies, I got this code from a protocol spec that I must use for communications to a RS232 interface and this the way they calculate the CRC for the data in the packet.
I have never done any C programming and thought that somebody in this list may be able to assist. The idea that I get from the replies is that I should rather use a Python module for calculating the CRC, thanks Dave for the suggestion. I'll rather go and look at that than to use a translated C code snippet. Every now and again I come across C code that is compared with Python code and since I don't know C, I can't follow the comparison. I never use C in my work, so for me to go and study the syntax and code layout is something I wouldn't really use a lot. Johan -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Dave Kuhlman Sent: 06 February 2007 07:28 PM To: tutor@python.org Subject: Re: [Tutor] CRC calculation with python On Tue, Feb 06, 2007 at 12:10:36PM -0500, Chris Calloway wrote: > First, you need to find the preprocessor define for CCITT_POLY. The > code is incomplete without it. > > Second, where did this code come from? It defines an unused local > named cval, which will usually cause at least a compilation warning. > > This looks like a snippet, not a complete CCITT CRC calculation. Also, see the crcmod module: http://crcmod.sourceforge.net/ But, the README that comes with crcmod recommends the md5 module in the Python standard library. Dave -- Dave Kuhlman http://www.rexx.com/~dkuhlman _______________________________________________ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.432 / Virus Database: 268.17.25/669 - Release Date: 2007/02/04 09:58 PM -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.432 / Virus Database: 268.17.25/669 - Release Date: 2007/02/04 09:58 PM _______________________________________________ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
