Re: [Amforth-devel] Interrupt handling question

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

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Hi Hans,
>> > Do you have a tool that aids in translating Forth to Assembler,
>>
>> I don't _have_ such a tool, I _am_ that tool ;=)
> 
> Given that the routines I need are really simple, maybe I can use you
> as the tool?

I wont recommend me for routine tasks. I'm buggy[1] and my overhead
is pretty high since I tend to write scripts to assist me ;)

> My mechanism may also fill the needs of others:  I have
> set up the necessary scripting that converts one or more forth files
> (using "\ include" as syntax) to a hex file that can be flashed.  The
> source is flashed so that the last adress is right below the boot
> block.  Comments and while space are stripped.  The compile-from-rom
> forth program changes the input vectors so that characters are read
> from ROM until the last byte below the boot block has been hit.  Then,
> the input vectors are set back to rx0/rx0?.

I had quite a few uses for this io redirect, but yours is ingenious.

> Together with my scripting mechanics (and the Forth file translated to
> assembler), it will be possible to build a complete amforth system
> from source without having to go round-trip to the target.

That would be a host based compiler. Do you know the avr assembler
from Daniel Kryzcena? (krue.net). It is written for gforth and he
makes his avrforth with it.

> It may even be good to add some more code so that the source can be
> viewed on the target (in the tradition of making the source code
> available to the "customer").

You drive the idea of a "stand-alone" system to it's limit, don't you?

> For my FPGA application, I will propably put the source into the
> serial flash and compile from there, but I first want to have this
> running on a real AVR.

What's wrong with your io redirect? Put the base system into whatever
the flash is and let KEY read from eeprom, btw: do you want to publish
this module?

Bye
Matthias

[1] I found a stupid error in the interrupt system. For my atmegas
timer0 now increases a variable with your settings for an
hout by now... See svn trunk.
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