[Amforth-devel] Difficulty with Hello World exercise

[D N. <dny...@at...>]

I'm having some difficulty getting started with amforth on my target 
system; I'm shaking down the entire tool chain at once. (I'm a bit rusty 
with forth generally, but used it intensively back in the F79 days, so 
I'm remembering more every day) But my target hardware etc is all new at 
this point, and I'm a bit stuck.

My workbench pc runs XP, and I've installed the latest AVR Studio 4 with 
all 3 service packs. Attached to it is a dragon, and my newly assembled 
dragon rider kit. The dragon rider seems to have survived smoke test, 
and as far as I can tell is working correctly. Installed in the dragon 
rider is a 324P. Dragon rider also has the serial option instralled, and 
that's connected by straight-through cable to that pc's serial port 
running teraterm.

I unpacked the amforth zip distribution and created a project per Karl 
Lunt's getting started guide. I changed only the clock speed declaration 
to match the 18.something mHz crystal supplied with the dragon rider, 
and I also set both serial directions to polled, to simplify things for 
now. I set include paths with the -I options in Studo 4 and built the 
project. All seems to have worked, and hex files were created.

Studio downloads and verifies the code, both flash and eeprom regions. 
Letting it run generates no OK prompt, so I've single stepped the 
project from startup, by hitting F11 a step at a time. Control moves 
through the usual init pointers type stuff, then jumps to the inner 
interpreter at DO_EXECUTE.  When we get to the ijmp instruction, the Z 
register contains 0x3860, which according to the map file is 
PFA_DOLITERAL. This seems reasonable to me. But when the ijmp 
instruction executes, studio4 crashes. It does this every time.

I duplicated these steps on my desktop machine (running windows 2000) 
and targeted for the simulator. Everything works the same; execution of 
that ijmp instruction again has 0x3860 in Z, and also crashes studio4.

Surely something that simple, in a tool chain that's been released as 
long as studio4 has been out, can't be a simple bug in avr studio 
regarding the ijmp instruction. But I'm scratching my head over this, 
and have not, as a result, made much progress at getting amforth to run 
here.

Any suggestions,please?