AVR-Chat

Hi Bruce,

I don't think it can be the "Pin Change Interrupt" sources. The
firmware works on Ver1 boards.  I don't change a thing when I hook up
the boards to the Dragon.  The same code is used for both versions. 
Ver1 works while Ver2 hangs at PORTB.0 = 1.

Thanks,

Richard Cooke

--- In AVR-Chat@yahoogroups.com, Bruce Parham <obparham@...> wrote:
>
> Richard Cooke wrote:
> 
> > 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
> > 
> > 
> > This strange behavior doesn't occur with the Ver1 board, only with
> > Ver2.  I've checked (multiple times) to make sure that there are no
> > shorts.  I've checked the bare boards and everything looks good.
> > 
> > Does anybody have any ideas what I should try next?
> > 
> > Thanks,
> > 
> > Richard Cooke
> > Lake Forest, CA USA
> >  
> 
> Hi Richard,
> 
> Both of those pins are listed as "Pin Change Interrupt" sources.
Have they
> somehow become unmasked?
> 
> Bruce
>