USB controller in Android - wrong mapping for buttons

Unity Engine
,
1

I’m building an arcade machine running in a NanoPI M4 (Android 8.1).

I have a custom-built USB controller, which I tried connecting to a Linux PC, a Windows PC and Android NanoPI and proved that is correctly recognized as a joystick by all of them.

I have a Unity project that simply shows which button was pressed, using roughly this code:

string s = "Buttons: ";
foreach (KeyCode k in Enum.GetValues(typeof(KeyCode))) {
   if (Input.GetKey(k)) {
       s += k.ToString() + " ";
   }
}
GUI.Label(Screen.safeArea, s);

When I run it in Windows, I press the “first” button in the controller and I get as expected:

Buttons: JoystickButton0 Joystick1Button0

Same project built for Android, running in NanoPI M4, same controller connected to the USB port, I get:

Buttons: JoystickButton15 Joystick1Button15

I tried using a (generic, chinese) USB gamepad and got the same results: it seems that Unity in Android maps buttons 0-4 to 15-19; and any other buttons are not mapped at all!

This is the Android app Gamepad Tester showing that I am pressing the first button (to show that the OS is correctly recognizing the USB controller, and it’s Unity the one apparently messing things up):

800×763 180 KB

And this is my simple Unity project running in the same Android box, same USB controller, same button:

800×386 97.3 KB

Has anyone encountered the same behavior? Is there a way to instruct Unity to map the buttons differently?

Thanks!

2

Too bad, old post but no replies.
Having the same problem right now, trying to port my PC game to Android and the mapping is weird. I don’t have many controllers to test it but have a few. The mapping is different if connected to Bluetooth or cable.
Tested with some controllers SF30 Pro (cable, Bluetooth, dinput, xinput), 8bitdo zero, xbox 360 (cable), ps2 (cable).