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Finally found the solution:
The default configuration of GPIONext is not optimal for those inputs.
What fixed it:
Hope it helps someone else !
@everett115 please fill out https://retropie.org.uk/forum/topic/3/read-this-first
@mitu sorry, it doesn't work 😢
@mitu There is no modification needed at all you can use multi-switch --generic command to offer an easy setup.
@MaMikee Please install raspi-gpio at first with sudo apt install raspi-gpio command. There are tons of other possibilities available ;)
pi@retropie:~ $ uname -r
Ok that's great news! Thank you!
Sorry, i believed it was possible. No problem, you can delete this Fr topic , i opened this topic in English too.
for me, not working, some games in dreamcast i cant move directional of gpio only buttons of action :(
@scopaust As with other controller that don't have a hotkey, you can use Select instead of a hotkey.
I did my setup manually, but I saw the option a few months ago.
When you configure input in es, do P1 first, then go back and do P2. This will then map both controllers in the auto configuration script, otherwise it only creates the map for player 1
@mitu thanks for the answer, but not exactly what I meant...
I'll explain myself...I have a custom board that uses the exact same pinout from the link I posted, that same pinout is the same as recalbox which now can simply toggle to activate it
My question is if that can still be made in Retropie like the tutorial I posted or if there's newer ways to do it (and maybe simpler?)