AVR-Chat

John

It sounds to me as though you're saying that you _can_ program through 
DW - and re-reading the data-sheet it appears this should be the case - 
something I must look into further - thanks for the prod. It seems there 
has been a deal of discussion on AVRFreaks about possible problems with 
JtagICE II and DW. Perhaps my DW experience has been tainted by the fact 
that my setup simply doesn't do what it doesn't say on the tin.

As far as enabling the DW fuse goes, the JtagICE II section on the DW 
interface says:

"AVR devices with debugWIRE interface are shipped with the DWEN fuse 
un-programmed from the factory. The debugWIRE interface itself cannot 
enable this fuse."

Is this wrong?

Thanks,
Mark


John Samperi wrote:
> At 09:41 PM 26/01/2007, you wrote:
>   
>> you can't program with DW and can't have both ISP and DW enabled at 
>> the same time,
>> so the program/debug cycle isn't exactly seamless.
>>     
>
> True, but why would you want to both program and debug at the same time
> on the same chip that has DW enabled? Set the fuses BEFORE you start a DW
> session, then simply "Build and run" from then on. The new code will be
> automatically download into the chip each time you have a successful build.
>   
> You don't even have to program the DW fuse as many people mistakenly do,
> this will also be done automatically the first time you start a debugging
> session. Once you finish debugging simply disable DW from within a DW
> session and your chip is as good as new....well minus a few hundred write
> lives :)
>
>