Hello Martin,
Welcome to the list.
AmForth on the Arduino Uno R4 wifi board would be a wonderful step
forward,
and yes, if and when you are ready to contribute back it will be
gratefully
received :) Like the UNO R3 and the MEGA, it is a board that it is
always
likely to be readily available.
My ARM and AmForth ARM experience is limited. From a top level look at
the
ARM source, it seems similar to the current SVN repo RISC-V (ISA
excepted)
so you may be getting knowledge of two for a little over the price of
one.
I also have some ESP32-C6 which is a RISC-V which I'm also very curious
about, but I have to focus on one platform at a time :)
I have made some progress getting AmForth running on some WCH RISC-V
mcu,
and polling RX certainly works well enough to get a Forth prompt.
I'm sure you have it already, chapter 28 has the register values you
will
need to make something similar to appl/launchpad-arm/words/usart.s
https://www.renesas.com/en/document/mah/renesas-ra4m1-group-users-manual-hardware
When you get the prompt, I think you will have a similar arrangement to
SVN RISC-V; core words in flash, new words defined in ram (so they do
not
survive a reset) and perhaps some memory issues arising from a shared
heritage with the AVR codebase. I mention it now, as I did with the
RISC-V
codebase.
Which leaves flash for persistence, eeprom (I think the RA4M1 has 8-KB
data
flash memory (100,000 program/erase (P/E) cycles)) and interrupts :)
Lots of
choices to be made. Both AmForth ARM and RISC-V are currently
wonderfully
experimental.
I Look forward to hearing how you get on.
Best wishes,
Tristan
On 2025-12-21 13:52, Martin Kobetic wrote:
Hi, I just want to introduce myself and highlight that I'm trying to
get
armforth going on Arduino Uno R4 wifi board. I'm relatively new to
forth
and embedded programming in general but I'm learning quickly (and
having a
blast). I've got flashforth running on atmega 2560, although that was
mostly about figuring out some bootloader details. But I wanted to play
with 32-bit forth and MCUs and amforth looks like a great platform to
start
with.
Uno R4 board uses Renesas ARM Cortex M4 (RA4M1), so I copied
appl/launchpad-arm and started tweaking it. Again the beginnings were
about
figuring out bootloader stuff, but now I have amforth finally starting
properly and currently debugging my tweaked version of delays. Next I
need
to get the serial connection going so that I can interact with forth
and
then I'll probably spend some time playing with the onboard LED matrix.
I'd
be happy to contribute back once I have something worth contributing.
In
the meantime you can see my progress at
https://github.com/mkobetic/amforth/compare/main...unor4.
If there's anyone who's also playing with the ARM stuff or knows what
state
it's in, I'd love to get some pointers or collaborate. In the meantime
I'll
keep you posted if I get anywhere with this.
Best regards,
Martin
PS: I also have some ESP32-C6 which is a RISC-V which I'm also very
curious
about, but I have to focus on one platform at a time :).
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