[Amforth-devel] Image Debug

[<an...@ki...>]

Guys

I have compiled and downloaded the image for the amforth core as it 
comes, using a hand tweaked set of device defs. But cant get a squeak 
out of the board. (atmega1280, on an arduino mega clone)

Compilation is fine except for a single warning:-

C:\Documents and 
settings\andy\Desktop\forthduino_3.8\core\devices/atmega1280.asm(192): 
warning: .cseg .db misalignment - padding zero byte

ATmega1280 memory use summary [bytes]:
Segment   Begin    End      Code   Data   Used    Size   Use%
---------------------------------------------------------------
[.cseg] 0x000000 0x01e7e0   1904   5908   7812  131072   6.0%
[.dseg] 0x000200 0x000200      0      0      0    8192   0.0%
[.eseg] 0x000000 0x000040      0     64     64    4096   1.6%

Assembly complete, 0 errors. 1 warnings



At the moment I am considering the list below.

1. I missed tweaking something in the code as it comes, Mathias 
suggested  using polled serial comms instead of ISR's. Do I need to 
tweak something to make this so, or does it do it already? There may be 
no response from the serial link but the board may actually be running.

2. I have got something wrong with the fuses and addresses etc and the 
board just is'nt running. Programing all verifies etc and is done from 
AVR Studio, 4.18 with an AVR ISP Mk2.

BOD, Disabled
SPI, Enabled
Boot Flash 4k, start $F000 (to match .equ max_dict_addr = $F000)
Full swing osc , slow rise time with max delays


3. I have got something wrong with the hardware defs or the tweaks to 
the app asm file and the code just is'nt running, crashed.


To help with the debugging, I need to turn on the debugging LED that is 
connected to port B7.

Where and how is best to place the code?

Where: as in it will run at boot and turn on the LED showing something 
is live. Where it can stay once I have completed and become part of the 
templates in the distribution. (not somewhere it will interfere with 
someone else's implementation of a 1280 based non arduino board, will 
blink it rather than leave it on eventualy)

How: as in, just in line assembler at the indicated spot, or do 
something that approaches the assembler approximation of forth.

40 DDRB c!
40 PORTB c!

Whilst ultimately blinking would be nice for now I am happy with turn 
the LED on.

I am not really looking for someone to do this for me here, just point 
me in the right Amforth compatible direction.

All input and advice welcome.

Cheers

Andy Kirby