Hardware approach: You could attach a momentary push button to one of the GPIO pins, just as the RetroPie GPIO adapter does. You could then poll the state of the button, e.g., with SNESDev (https://github.com/petrockblog/SNESDev-RPi) and perform certain action, when certain events have happened. SNESDev has implemented a three state automaton with this functionality:
• press and hold: send “r” key (for rewind function of RetroArch)
• press and release three times: send “ESC”
• press and release five times: shutdown
The idea is to set a key that must be held to use hot keys (such as select) with “input_enable_hotkey_btn = 1” and then an exit key (such as start), which will now only work if the enable hot key button is held down, with “input_exit_emulator_btn = 2”.[/qoute]
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