Can't make same inputs between USB and GPIO controller

Garell

Hi,

I recently setup my 2P arcade cab with a PI4 and GPIONext. In most games/emulators everything works fine.

My issue is with fighting games like Marvel vs Capcom where you need to make a joystick input + pressing 2 buttons simultaneously. The in game combo isn't triggered while playing with my GPIO controller. But the same inputs work flawlessly with an USB arcade controller.

As a counter example, a simple shoryuken works on both controllers (joystick input + 1 button).

Now I'm not sure were to look at, is it an issue from GPIONext ? (haven't found anything on their github about this) Or is it a configuration issue in the Retroarch controller setting ? (tried to modify controller driver there, but most times it breaks the GPIO controller)

Hopping someone can shed some light on this.

Cheers !

mitu

Most likely a GPIONext issue. You can easily test if all your inputs are processed with jstest - just run jstest /dev/input/js0 with only the GPIO controller connected and press the neessary buttons/joysticks for the combo(s).

Garell

Thank you for your quick reply !

I already did this test, but I didn't see anything unexpected though.

Garell

Finally found the solution:

The default configuration of GPIONext is not optimal for those inputs.

What fixed it:

gpionext set combo_delay 0 # was 50

Hope it helps someone else !