Genious.  I will test this.  If true, it's definately a great way to do
it...

Kyrre


----- Original Message -----
From: "Howard Winter" <HDRW@H2ORG.DEMON.CO.UK>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Sunday, June 27, 2004 12:33 AM
Subject: Re: [PIC:] 16F88 RS232 bootloader.


> Kyrre,
>
> On Sat, 26 Jun 2004 17:50:44 +0200, Kyrre Aalerud wrote:
>
> > Is this better or wose than the sum method ?
>
> If I remember rightly (it's late so I can't think
> clearly enough to check!) if the last byte transmitted
> is the checksum, the result of a rolling XOR of
> everything before, when you XOR it you will end up with
> zero if all was sent correctly.  So the receiver just
> XORs everything it receives and the result should be
> zero - easy!
>
> > Maby I can do both ?
>
> No need - it doesn't improve anything.
>
> Cheers,
>
> Howard Winter
> St.Albans, England
>
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