AVR-Chat

On Fri, Oct 16, 2009 at 09:22:28AM -0300, Emerson Santos wrote:
> HI
> 
> I?ve a AVR DRagon and I made a 10 pin flat cable with about 30 cm
> length ... well , when I put a ATmega16 or mega32 .. its work fine (I
> use the AVRSTudio 4.16 build 638), but with ATmega164p the JTAG fail
> with a message that not can?t read ... when I use my hand to envolve
> the flat cable .... Its work ...? Its a EMI ? EMC ???
> 
> Anyone have this type of problem ?

Yes. Have had that sort of problem with the Dragon where an ECROS ICE
Cube worked perfectly.

Not sure that just one thing "fixed" my problem but the Dragon behaved
differently for different length of cable. Seemed to work best at 6",
about 14 cm, which was as short as I could make it.

Also put 1/4" thick rubber feet on the bottom of the Dragon to hold it
off the metal top table. Believe that helped but wasn't a complete cure.
The combination of rubber feet and short cable got things working.

-- 
David Kelly N4HHE, dkelly@HiWAAY.net
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Whom computers would destroy, they must first drive mad.