i just started a custom Zynthian build, after I had a RasPi4 some months and had nothing else to do with it.
I will use 4 Arcade-Buttons for UI-Control and a 3.5“ Touchscreen.
The Buttons are connected to GPIO and work so far. Today I got the display working. I had some problems with inverted x-axis but it all works now.
Now I would like to know what GPIO-Pins the Display actually uses (Cheap Screen, works with the RasPi 3.5, V.1-Settings), because I want to build MIDI In/Out-Circuitry which I want to connect to the GPIO-Pins.
Can anybody help me on how to do that? I would like to use some form of extension to connect the Display only to the Pins it needs, so I can use the other Pins for MIDI In/Out (and possibly for Aufio too).