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Article #16203CRC probleem? hoe zit het met de Belgische programmeurs?
From: Heynderickx Steven
Date: Tue, 30 May 2000 00:00
Date: Tue, 30 May 2000 00:00
46 lines
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1791 bytes
Hi Everyone, I am trying to understand a technical memo I have recieved, I need to figure out how to make a CRC for a string of bits. The technical info in the memo says the following: ----------- The string is 88 bits long and the last 8 bits contain the CRC The Hardware control of the CRC is performed through a 7bit scrambler behaving polynomial 1+X^(-1)+X^(-5)+X^(-7) its initial state is B"1111111". The last 8 bits of the incoming message must be calculated in such a way thet the end of the transmission the content of the scrambler is B"00000000" ----------- Does anybody understand this? the following data strings match the CRC if it is of some use to you 1 0 0 0 1 1 0 0 1 0 0 1 0 0 1 1 0 1 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 0 0 0 0 0 1 0 0 0 1 1 0 0 1 0 0 1 1 0 1 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 1 1 1 1 0 0 0 0 0 0 0 0 1 0 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 1 1 1 1 0
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: fcea4,2167cb167627d6bf,start X-Google-Attributes: gidfcea4,public From: "Heynderickx Steven" <heynderickx@artefici.com> Subject: CRC probleem? hoe zit het met de Belgische programmeurs? Date: 2000/05/30 Message-ID: <8h0kiu$h6r$1@nereid.worldonline.nl> X-Deja-AN: 629035725 X-Priority: 3 X-MimeOLE: Produced By Microsoft MimeOLE V5.00.2314.1300 X-Complaints-To: newsmaster@worldonline.nl X-Trace: nereid.worldonline.nl 959698334 17627 195.241.222.195 (30 May 2000 14:52:14 GMT) Organization: WorldOnline - The Internet Communication Company X-MSMail-Priority: Normal NNTP-Posting-Date: 30 May 2000 14:52:14 GMT Newsgroups: be.comp.programming