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Re: [avr-chat] avrdude-ATMega32 fuse bits issues

From: Brian Dean
Subject: Re: [avr-chat] avrdude-ATMega32 fuse bits issues
Date: Tue, 20 Dec 2005 23:40:59 -0500
User-agent: Mutt/1.5.11

On Tue, Dec 20, 2005 at 08:34:08PM -0800, Chris Pontiga wrote:

> So at this point I would say that my problem lies in the bsd cable I
> am using. For some reason it 0's out everything thing on the chip when
> programming. I found out this was the case after popping the chip off
> of the breadboard and back into the STK500.  I read the chip into a
> file and found that all the bits were zero.
> I am pretty sure that all the lines are hooked up correctly.  MISO,
> MOSI, SCK, and RST are all connected to the chip through 330 ohm
> resistors.  GND is connected directly to ground.

How long is your cable?  I wonder if your parallel port might be a
little weak?  Do you have MISO, MOSI, and/or SCK connected to anything
else other than directly to the chip?  Sometimes something else in the
circuit can load those lines down enough so that the programmer cannot
take control of the lines during programming.  The STK500 is fairly
strong in this regard, so you might be able to program successfully
with the STK500 but not with a weaker programmer like the parallel
port + series resistors.  Just a thought.

Brian Dean
ATmega128 based MAVRIC controllers

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