Hi folks.

I’ve spent more than a few evenings fiddling around to get a custom system built that enables the st7789v display via the Linux fbtft driver as the console and the “hifiberry” DAC on the pirate audio board that I’m using.

Here’s a photo because it’s awesome:

IMG_3953640×480 38.9 KB

The next step of the project is to start working on a Scenic based UI for the device. I’ve just tried throwing scenic_driver_nerves_rpi at it to see what happens, and while it seems to load and start correctly nothing is displayed on the console.

Currently installed is scenic 0.10.5 and scenic_driver_nerves_rpi 0.10.1.

The configuration is:

config :podbox, :viewport, %{
  name: :main_viewport,
  size: {240, 240},
  default_scene: Podbox.Scene.Main,
  drivers: [
    %{
      module: Scenic.Driver.Nerves.Rpi
    }
  ]
}

And the default scene is:

defmodule Podbox.Scenes.Main do
  use Scenic.Scene
  alias Scenic.Graph
  import Scenic.Primitives
  import Scenic.Components

  @graph Graph.build()
         |> text("Hello, World!", font_size: 22, translate: {20, 80})

  def init(_scene_args, _opts) do
    {:ok, %{graph: @graph}, push: @graph}
  end
end

Running Scenic.ViewPort.info(:main_viewport) returns:

{:ok,
 %Scenic.ViewPort.Status{
   drivers: %{
     #PID<0.2941.0> => %Scenic.ViewPort.Driver.Info{
       module: Scenic.Driver.Nerves.Rpi,
       type: "Static Monitor",
       id: nil,
       width: 1996092956,
       height: 1993753600,
       pid: #PID<0.2941.0>,
       private: nil
     }
   },
   root_config: {Podbox.Scene.Main, nil},
   root_graph: {:graph, Podbox.Scene.Main, nil},
   root_scene_pid: Podbox.Scene.Main,
   size: {240, 240},
   styles: %{},
   transforms: %{}
 }}

Does anyone have any idea what might be going wrong?