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'[PIC]:ParityBit?'
2001\01\08@083603 by Francois Robbertze

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Dear piclist members

Is it neccessary to include a parity bit if you compare the received bytes against a  8 bit CRC value?
If some of the bits is corrupted the CRC test will fail anyway... so will a additional parity test makes the data more reliable?

Regards

Francois
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2001\01\08@102130 by Bob Ammerman

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A CRC will give you _much_ more message security than a typical parity bit
scheme.

Parity bits will give you  a small additional chance of catching a bad
packet.

When I use CRC, I generally do not bother with parity.

OTOH: When I use a simple LRC (addition or XOR or both) then I sometimes
include parity, too.

(LRC == Longitudinal Redundancy Check)

Bob Ammerman
RAm Systems
(contract development of high performance, high function, low-level
software)

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