Hey Florian,
I've made the 4-player setup with the controlblock configured as arcade-gamepad.
Everything is the same as you discribed, unless the jumpers:
The lower ControlBlock has jumper configuration SJ1:0 SJ2:0;
The upper ControlBlock has jumper configuration SJ1:1, SJ2:1.
I've tested all the connections in arcade mode and every button works fine.
So it looks like the connection to the RPi is working well...
The log-file is copied after I've done the arcade-mode testing, but it doesn't look strange (to me).
2020-05-29 17:14:50.441 DEBUG [467] [Logger::logMessage@18] Starting ControlBlock driver.
2020-05-29 17:14:50.448 DEBUG [467] [Logger::logMessage@18] Created configuration. isEnabled: true, address: 0, pad type: arcade, power switch: true, only one gamepad: false
2020-05-29 17:14:50.449 DEBUG [467] [Logger::logMessage@18] Created configuration. isEnabled: true, address: 6, pad type: arcade, power switch: false, only one gamepad: false
2020-05-29 17:14:50.504 DEBUG [467] [Logger::logMessage@18] Enabled power signal.
2020-05-29 17:14:50.504 DEBUG [467] [Logger::logMessage@18] Created PowerSwitch. doShutdown: 1
2020-05-29 17:14:50.504 DEBUG [467] [Logger::logMessage@18] Starting gamepad polling ...
I've also taken a copy of the log-file when in NES/SNES-mode, this one you can see below:
2020-05-29 17:10:43.833 DEBUG [457] [Logger::logMessage@18] Starting ControlBlock driver.
2020-05-29 17:10:43.841 DEBUG [457] [Logger::logMessage@18] Created configuration. isEnabled: true, address: 0, pad type: nes, power switch: true, only one gamepad: false
2020-05-29 17:10:43.841 DEBUG [457] [Logger::logMessage@18] Created configuration. isEnabled: true, address: 6, pad type: snes, power switch: false, only one gamepad: false
2020-05-29 17:10:43.881 DEBUG [457] [Logger::logMessage@18] Enabled power signal.
2020-05-29 17:10:43.881 DEBUG [457] [Logger::logMessage@18] Created PowerSwitch. doShutdown: 1
2020-05-29 17:10:43.881 DEBUG [457] [Logger::logMessage@18] Starting gamepad polling ...
