Hello,
On 03/26/2011 11:31 AM, D Nyberg wrote:
> Okay gang, I'm making progress with my efforts to get amforth running,
> but encountering perplexing problems.
>
> Issue 1: I got the console running, but only by overriding the kernel's
> calculated uart divider value of 0x33 with my empirically determined
> value of 0x71. Must be running at a clock rate wildly different from
> what the crystal says, or is ignoring the crystal or something like
> that. Any thoughts on possible causes for this?
>
A brand new controller runs on its internal RC oszillator at roughly 1 MHz,
no matter what crystal is connected. To make the external crystal the
clock source for the controller, you must set the fuses accordingly.
Example: on the arduino duemilanove (atmega328p) with 16 MHz crystal, the
fuse values are
LFUSE=0xFF
HFUSE=0xD9
EFUSE=0x05
Check the file
amforth/releases/4.2/appl/arduino/readme.txt
in the amforth source tree.
>
> Issue 2: With the console running, I can do a few really basic things
> such as 1 . yields a correct response of 1<cr> ok, but... If I enter 1
> 2 + . I get the strange response "?? -13 6"<cr> ok.
The output
?? -13 6
says: What you typed in, resulted in an error (??), -13 is "word not found",
iirc, and 6 is the column in which the not-found word ends.
Cheers,
Erich
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