[fpc-pascal] Arduino project

[Christo Crause]

On Sun, Sep 13, 2026 at 4:19 AM Travis Siegel via fpc-pascal <
fpc-pascal at lists.freepascal.org> wrote:

>
> On 9/11/2026 4:15 PM, Christo Crause via fpc-pascal wrote:
> > Here are some thoughts on two types of boards (there are many
> > different boards of course):
> > - Arduino Uno R4 (esp32-s3 module): Wifi + USB + 1x serial + CAN,
> > higher power consumption, limited FPC support in trunk (workable but
> > not straight forward).
>
>
> I wasn't aware any of the arduino boards were supported by FPC, I was
> actually tempted to mention to the op that FPC might not be a good
> development platform, due to lack of support for arduino boards, but
> since I hadn't checked to be 100 percent sure, I left that part out of
> my reply.
>

FPC supports just about all of the AVR controllers used in many of the
Arduino boards:
Uno Rev1 - 3, Nano, Pro Mini (atmega328p)
Leonardo, Micro, Pro Micro (atmega32U4)
Nano Every, Uno Wifi rev2 (atmega4809)
Mega (atmega2560)


> Good to know such support is present, that might make some of my
> projects more accessible to more platforms.
>
> Where does one find the (limited) arduino support that is present in
> FPC? I'd be curious if any of the boards I have are directly supported.
>

FPC supports the AVR controllers but does not provide much in terms of
libraries.
Note that FPC supports the microcontrollers, not the boards as such.
Some third party libraries/code example:
https://github.com/ackarwow/unolib - Pascal version of some of Arduino's
libraries
https://github.com/ccrause/fpc-avr - Pascal examples and libraries


> I realize the difference between arduino boards isn't all that
> significant, so support for one is at least partially accessible to
> other arduino boards.  How would one (possibly) contribute to increasing
> the number of boards supported?
>

>From a compiler perspective the differences between Arduino boards can be
massive.
The controller could be based on AVR, ARM, RISC-V, xtensa or other
architecture.
The Arduino ecosystem hides this detail behind lots of abstraction.
Board support is an Arduino ecosystem concept, FPC can define an alias for
a
board that maps to a controller it supports, but it is not the same thing.

To reproduce the Arduino experience on top of FPC I suggest expanding the
Unolib project.

I have probably half a dozen arduino boards here, along with the same
> number of raspberry pies, as well as micro:bit and propeller/basic stamp
> boards from parallax.  I'm now beginning to wonder if FPC could be
> adapted to work with the parallax propeller boards, since they aren't
> (functionally) all that different from arduinos, just been around a
> whole lot longer, and have more processors (in most cases)
>
> This is probably a discussion better directed to the fpc-devel list, but
> I'm just curious how difficult (or easy) it would be to support other
> boards.
>

Yes, best to enquire on fpc-devel.
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