I’ve set up RetroPie (great project!) and set up my USB controller. I first tried GBA and it worked fine with no additional configuration. When I try a SNES game, though, I can mash buttons all I want and nothing happens.
I’ve tried really hard to search for help with this but whenever I do I get posts of people trying to get their SNES controllers working with RetroPie, not trying to get their controllers to work with the SNES emulator.