Hello Matthias,
Matthias Trute <mtr...@web.de> writes:
> Hi Enoch,
>
>> *Background* A brief visit to Atmel's Studio while debugging the wlscope
>> ("wordlist scope") patch convinced me that this magnificant tool is not
>> really good at Forth level debugging as it has no concept of the Forth
>> VM.
>
> You dig deep into the inner workings of amforth. A rather dark place. A
> casual programmer is seldom seen in this area.
>
>>
>> *Idea* Let us take advantage of Atmel's documented JTAG protocol (e.g.,
>> AVR067: JTAGICE mkII Communication Protocol) and some reverse engineered
>> data (from AVaRICE) to explore the possibility of enhancing
>> amforth-shell.py with several commands that set VM breakpoints and
>> examine data unintrusively.
>
> The idea sound crazy enough to follow it. Its only beyond what I can do....
> I don't know whether the amforth-shell is the right place to start, it may
> need a more modular design.
>
> Keep in mind that some atmegas do not have JTAG (they have e.g. Debug Wire or
> nothing at all).
That's one of the reasons why such a project is beyond a single
programmer reach. I just have the JTAG Mk II to play with while Atmel is
pushing Mk III (*), there's the debugWIRE to handle, etc.
Within a few days I hope to find the time to conclusively decide about
this project feasibility or if it requires an AmForth kernel heck to
succeed.
Thanks again for the encouragement!
Regards, Enoch.
(*) IIRC the AVRDUDE / AVaRICE guys are in the process of reverse
engineering this Mk III protocol.
>
> Matthias
>
>
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