For use with Raspberry Pi Pico boards.
Adapted from the dev_hid_composite
pico-example from GitHub.
Supports PMW3360 optical mouse sensors.
When compiling for the first time, check out the required git submodules.
git submodule update --init
cd pico-sdk
git submodule update --init
Then do this to build.
mkdir build
cd build
cmake ..
make trackball
And flash the resulting trackball.uf2
file to your Pico.