Based on https://github.com/dmadison/ArduinoXInput - Install Arduino IDE hardware: https://github.com/dmadison/ArduinoXInput_AVR - Install Arduino IDE library from Library manager: XInput by David Madison - Tester from Windows Store: Game Controller Tester - Doesn't go to flashing mode automatically. Connect RST to GND to get Arduino Pro Micro to programming mode. - Arduino Pro Micro needs PB0/SS-pin to work. And it is not broken out. So no SPI for PSX-controller I guess? https://forum.arduino.cc/index.php?topic=427828.0