Re: [Amforth-devel] Image Debug

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

Hi Andy,


A few remarks from me (sorry, but I dont have the right
hardware at hand and the simulator is not really helpful)

Do you know the the web avr fuse calculator?

http://www.engbedded.com/fusecalc

I just played around with it from your remarks

>>> 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
>>>       

I stumbled across the full swing osc. The arduino schematics tells me
there is a quartz.
My guess for the fuses would be low 0x7f, high 0x99 and extended 0xff
(just enter
the values on the website to see the effects: factory default and a 16MHz
quartz).

>  >> Boot Flash 4k, start $F000 (to match .equ max_dict_addr = $F000)
> is correct though, or is it ??
>   

The max_dict_address is the highest address the self programming
feature can deal with. Everything above this limit is read-only for amforth.
It's basically the same as the maximum boot loader size. But: It's not a
bootloader, the reset has to start at address 0x0000, not at the bootloader
start address. (to make things even more complicate: It's possible to
move the amforth to the bootloader and turn it into an unbreakable
system, but thats a completly different story; I would not stress it _now_).


> Hmm a scope it is then, my hearing is very poor in the ultrasonic <|;)
>   

ROTFL mine too ;=)

> That's reassuring to know. I think I want to keep this to the templates 
> and board specific bits though. Rather than mess with the code that is 
> common to all.
>   

I just ordered an arduino mega, but it will take a week or two. Just
keep the hope
that it works. I absolutly sure it will do so.

Matthias