AVR-Chat

----- Original Message ----- 
From: "Richard Cooke" <rcooke@digitalwavelength.com>
To: <AVR-Chat@yahoogroups.com>
Sent: Monday, November 12, 2007 7:14 PM
Subject: [AVR-Chat] Debugging a ATmega48V - what's going on?


> Hi Folks,
>
> I've run into a problem that has me pulling out my hair.  I'm using
> the AVR Dragon and the latest version of AVR Studio to debug my
> boards.  I have two versions let's all them Ver1 and Ver2.  The only
> difference being the RF matching network.  Ver1 works fine.  If I use
> the exact same firmware that works in Ver1 in Ver2 it will hang at a
> spot that makes no sense.
>
> After working for quite a while, I discovered the offending code as
> "PORTB.0 = 1;".  All I am doing is setting the PORTB.0 pin high but as
> I single step through the code it will hang right here. So, the code
> snippet looks like:
>
> PORTD.7 = 1;  <-- this works
> PORTB.0 = 1;  <-- hangs here
>
> If I reverse the two lines to this:
>
> PORTB.0 = 1;  <-- now this works
> PORTD.7 = 1;  <-- debugger hangs here

A faulty flash memory location that loads and verifies OK, but doesn't work 
when the program runs?

Leon