This is a firmware for the Rapsberry Pi Pico that turns it into a USB adapter for two D-Sub 9 joysticks, as they where used for example with the Atari 2600 console and the Commodore C64 and Amiga home computers. They will appear as two digital hats/d-pads with only one button.
The code is based on the various examples of the Pico SDK and TinyUSB and keeps their MIT license.
You can use the precompiled binary from the release page if you use the same GPIOs as in the hardware example below:
| GPIO | D-SUB pin | Function |
|---|---|---|
| 10 | 1 (J1) | J1 UP |
| 11 | 2 (J1) | J1 DOWN |
| 12 | 3 (J1) | J1 LEFT |
| 13 | 4 (J1) | J1 RIGHT |
| 9 | 6 (J1) | J1 BTN |
| 18 | 1 (J2) | J2 UP |
| 19 | 2 (J2) | J2 DOWN |
| 20 | 3 (J2) | J2 LEFT |
| 21 | 4 (J2) | J2 RIGHT |
| 17 | 6 (J2) | J2 BTN |
Additionally you need to connect pin 8 of both D-SUB connectors with GND on the Pico.
If you want to use different GPIOs, you easily can build the firmware yourself. Like any other pico project, after installing the Pico SDK you do:
$ mkdir build
$ cd build
$ cmake ..
$ make
