CRC Ganeration

[Nibble]

Hello
I need to do code for a 7 bit CRC calculation to protect 5 bytes. The
polynomial is x^7+x^3+1
Can anybody help me?
Thanks in advance.

 

[Paul Burke]

Nibble wrote:

Hello
I need to do code for a 7 bit CRC calculation to protect 5 bytes. The
polynomial is x^7+x^3+1
Can anybody help me?
Thanks in advance.

Google for CRC calculation! Here's one simple result:
<http://www.relisoft.com/Science/CrcNaive.html>

It's basically shifting in , XORing the MS bit with the poly, and
pushing 1s or 0s into the CRC.

How you do it in the end depends on how fast you want to do it, whether
it's in software or hardware, how much time you've got to debug it etc. etc.

Paul Burke