Retroarch theme for 2-way joysticks/defender layout?
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I have been running an older RetroPie for some time happily, but this last week I dusted off the parts I got some time ago to make a Defender/Stargate front panel, with a two-way joystick and leaf switch buttons. I am planning to try using GP2040-CE for the USB interface on this panel, and update retropie itself to the current release.
I am trying to figure out the best way to actually use this control scheme though. I was thinking I would set up the existing generic panel (2 sticks, 12 buttons) as players 1 and 2 in gp2040-ce's config, and the new Defender one as player 3. That way, I'm hoping that I can tell from lsusb or similar which one is currently connected.
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Is there a way to start RetroPie with a different emulationstation theme? (and does one exist that works with only a 2-way up/down joystick?)
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Is there also a way to change the listed games to only the ones supported by that controller? (i.e. MAME/Defender and MAME/Stargate, pretty much)
I don't mind if it takes a restart to switch controls, and I also don't mind writing some code or bash script to handle the startup part, if the basics already exist...
Just hoping to avoid having a keyboard plugged in just to navigate the menus :-)
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