This is a “fork” of Shyri GBA BT HID project which allows your GBA to be used as Bluetooth gamepad. I wanted a professional board for soldering everything, so I made it, however you have to use his code (I put a copy of his project in mine).
I haven't been able to write the code yet, if you find an easier way to do that, please let me know it!
This project is licensed under a Creative Commons license: Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
Check the LICENSE.md for more information.