AVR-Chat

Hello Guys,

I'm working with ATMEGA328P (Arduino Board) in C, in AVR Studio and AVR 
Dragon. When I download and run, every time I press the reset button the 
board freezes.
Could anyone suggest a reset interrupt handler I can use in my project? 
I am more familiar with Assembly and in this case it would be 
straightforward, but in C I don't know how the compiler handles this.

Thank you in advance.

> Hello Guys,
>
> I'm working with ATMEGA328P (Arduino Board) in C, in AVR Studio and AVR
> Dragon. When I download and run, every time I press the reset button the
> board freezes.
> Could anyone suggest a reset interrupt handler I can use in my project?
> I am more familiar with Assembly and in this case it would be
> straightforward, but in C I don't know how the compiler handles this.
>
> Thank you in advance.

  Reset takes you to "location 0", the same as a power up.  If you are
using an Arduino that restart location is the bootloader.  Some of the
Arduino bootloaders that I've seen hang out there for several seconds
before jumping to user code.  How long do you wait before you decide
that you've "frozen"?

DLC
-- 
Dennis Clark
TTT Enterprises

Dennis

I have a blinking LED using timer interrupt. This is what I use to check 
if the board is working or not.
When I program the board with debugWIRE and run the code, the LED stops 
blinking in on or off state just after I press the reset button.
After more tests programming and running the code, I left the debug 
session after pressing "disable debugWIRE" in AVR Studio. It was a 
surprise for me the board restarted running my code after I pressed 
reset button.
My conclusion is the board stays in debugWIRE mode unless I press the 
disable debugWIRE in AVR Studio. If I do not press the button and exit 
the software, debugWIRE is not disabled and something wrong happens when 
I press reset button.
Solution: always press "disable debugWIRE".

Adeilton Oliveira
GMB



Dennis Clark wrote:
>  
>
>
> > Hello Guys,
> >
> > I'm working with ATMEGA328P (Arduino Board) in C, in AVR Studio and AVR
> > Dragon. When I download and run, every time I press the reset button the
> > board freezes.
> > Could anyone suggest a reset interrupt handler I can use in my project?
> > I am more familiar with Assembly and in this case it would be
> > straightforward, but in C I don't know how the compiler handles this.
> >
> > Thank you in advance.
>
> Reset takes you to "location 0", the same as a power up. If you are
> using an Arduino that restart location is the bootloader. Some of the
> Arduino bootloaders that I've seen hang out there for several seconds
> before jumping to user code. How long do you wait before you decide
> that you've "frozen"?
>
> DLC
> -- 
> Dennis Clark
> TTT Enterprises
>
> 



[Non-text portions of this message have been removed]

At 11:08 AM 15/08/2009, you wrote:
>Solution: always press "disable debugWIRE".

Absolutely correct otherwise you have no reset (pin used by DW).

You can also use the BOD to help with resets.

Regards

John Samperi

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