[SOLVED] Teensy Joystick registering multiple events per button press

[theluthier]

I’m building a rpi2 + retropie into a gameboy pocket. I’ve wired the GBP’s buttons to a Teensy and installed a generic USB Joystick sketch. I’ve tested the setup extensively on Mac and Linux machines, both working perfectly. However whenever I connect the Teensy to my rpi2 + retropie, the Teensy joystick registers as a dev/input/eventX instead of a dev/input/jsX – On my other linux machine, it registers as a dev/input/jsX.

As an event, every button press registers multiple times per press. Here’s a video running the evtest command:

https://goo.gl/photos/gQotv2zJyvpULThL9

Based on my searching, it seems that the Teensy registering as an “event” instead of a “js” could be the issue. But I can’t find how to remedy the registration. Any advice on how to fix this so each button press registers once would be much appreciated!

[theluthier]

I managed to solve my problem. The issue seemed to come from the example sketch included with Teensyduino found under File > Examples > Teensy > USB_Joystick > Complete. I’m not an experienced arduino-er, but with that sketch the buttons seem to be sourced and updated using a “Joystick.send_now” command. When I modified the sketch to source and update based on the “bounce” method, the buttons worked as expected. The bounce method is used in another example sketch: File > Examples > Teensy > USB_Joystick > Buttons. Modifying that approach according to my setup was fairly simple to get it working.

In the end, this really had nothing to do with RetroPie.

[Anonymous]

Hello theluthier, can you post your sketch? I have the same problem!

Thank You!

[theluthier]

Absolutely @cluf20! It’s maybe tailored toward my specific setup, but maybe you can derive something from it if you can’t use it as is.

[Author]

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