checksu7ms

MAUREEN · Guest

How do I generate a checksum (16 or 32 bits). What's the
difference between checksum & crc?

StuH_CC · Joined: 07 May 2004 Posts: 16 Location: Shropshire, UK

CCS have provided a driver to generate 8,16 and 32 bit CRCs - it's in the "Drivers" directory of your compiler installation, called CRC.C. There's also an example called EX_CRC.C in the "Examples" directory. Hope this helps.

Stuart.

dyeatman · Joined: 06 Sep 2003 Posts: 1912 Location: Norman, OK

A Cyclic Redundancy Check (CRC) is a mathematical algorithm to determine if an error exists. A checksum is exactly that, just a sum of the data being transmitted.

An 8 bit checksum is where the individual bytes are simply added together modulo 256.

Hope this helps!

SherpaDoug · Joined: 07 Sep 2003 Posts: 1640 Location: Cape Cod Mass USA

A checksum is very easy to impliment and fast to execute but may miss more errors than a CRC. Longer checksums or CRCs catch more errors than shorter ones but take more resources.
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