Orbital - build and flash Gleam projects to devices running

Erlang Platform & Framework Forums AtomVM Forum
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1

Hello! I’ve started playing around with Gleam and AtomVM and I’m having so much fun! I made a little tool called orbital to help build and flash Gleam projects to embedded devices, though I might share it here for folks who want to give that a try :slight_smile:

A video showcasing the 'orbital' workflow: The command 'gleam run -m orbital flash esp32 --port /dev/tty.usbserial001' is ran in a terminal window. After a short while the message 'Done' is displayed and the command 'screen' is ran to show that the code was flashed and is running on an esp device

2

Thank you for the awesome project! May I ask you what library did you use for the GPIO access in the video? Or is it just a set of wrappers over external Erlang functions?

3

Yeah it is a little set of wrappers I defined in my Gleam project:

pub type Value {
  High
  Low
}

pub type Mode {
  Output
  Input
}

@external(erlang, "pin_ffi", "set")
pub fn set(pin: Int, to value: Value) -> Result(Nil, Nil)

@external(erlang, "pin_ffi", "mode")
pub fn mode(pin: Int, mode: Mode) -> Result(Nil, Nil)

% inside src/pin_ffi.gleam
-module(pin_ffi).
-export([ set/2, mode/2]).

set(Pin, Value) ->
    % This is using the functions from atomvm's
    % gpio module
    case gpio:digital_write(Pin, Value) of
        ok -> {ok, nil};
        _ -> {error, nil}
    end.

mode(Pin, Mode) ->
    case gpio:set_pin_mode(Pin, Mode) of
        ok -> {ok, nil};
        _ -> {error, nil}
    end.
4

Thanks, that helped a lot!