AVR-Chat

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