We'll be using the dk Board Support Package. It's good to have its API documentation handy. You can generate the documentation for that crate from the command line:
✅ Run the following command from within the nrf52-code/usb-app folder. It will open the generated documentation in your default web browser. Note that if you run it from inside the nrf52-code/boards/dk folder, you will find a bunch of USB-related documentation missing, because we disable that particular feature by default.
cargo doc --openNOTE: If you are using Safari and the documentation is hard to read due to missing CSS, try opening it in a different browser.
✅ Browse to the documentation for the dk crate, and look at what is available within the usbd module. Some of these functions will be useful later.