Re: [Amforth] AmForth JTAG support

[Matthias T. <mt...@we...>]

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).

Matthias