Add Feather RP2040 README

boards/feather_rp2040/README.md

@@ -1 +1,94 @@
-Adafruit Feather RP2040 Board Support Crate
+# [feather_rp2040] - Board Support for the [Adafruit Feather RP2040]
+
+You should include this crate if you are writing code that you want to run on
+an [Adafruit Feather RP2040] - a Feather form-factor RP2040 board from Adafruit.
+
+This crate includes the [rp2040-hal], but also configures each pin of the
+RP2040 chip according to how it is connected up on the Feather.
+
+[Adafruit Feather RP2040]: https://www.adafruit.com/product/4884
+[feather_rp2040]: https://github.com/rp-rs/rp-hal/tree/main/boards/feather_rp2040
+[rp2040-hal]: https://github.com/rp-rs/rp-hal/tree/main/rp2040-hal
+[Raspberry Pi Silicon RP2040]: https://www.raspberrypi.org/products/rp2040/
+
+## Using
+
+To use this crate, your `Cargo.toml` file should contain:
+
+```toml
+feather_rp2040 = { git = "https://github.com/rp-rs/rp-hal.git" }
+```
+
+In your program, you will need to call `feather_rp2040::Pins::new` to create
+a new `Pins` structure. This will set up all the GPIOs for any on-board
+devices. See the [examples](./examples) folder for more details.
+
+## Examples
+
+### General Instructions
+
+To compile an example, clone the _rp-hal_ repository and run:
+
+```console
+rp-hal/boards/feather_rp2040 $ cargo build --release --example <name>
+```
+
+You will get an ELF file called
+`./target/thumbv6m-none-eabi/release/examples/<name>`, where the `target`
+folder is located at the top of the _rp-hal_ repository checkout. Normally
+you would also need to specify `--target=thumbv6m-none-eabi` but when
+building examples from this git repository, that is set as the default.
+
+If you want to convert the ELF file to a UF2 and automatically copy it to the
+USB drive exported by the RP2040 bootloader, simply boot your board into
+bootloader mode and run:
+
+```console
+rp-hal/boards/feather_rp2040 $ cargo run --release --example <name>
+```
+
+If you get an error about not being able to find `elf2uf2-rs`, try:
+
+```console
+$ cargo install elf2uf2-rs, then repeating the `cargo run` command above.
+```
+
+### [feather_blinky](./examples/feather_blinky.rs)
+
+Flashes the Feather's on-board LED on and off.
+
+## Contributing
+
+Contributions are what make the open source community such an amazing place to
+be learn, inspire, and create. Any contributions you make are **greatly
+appreciated**.
+
+The steps are:
+
+1. Fork the Project by clicking the 'Fork' button at the top of the page.
+2. Create your Feature Branch (`git checkout -b feature/AmazingFeature`)
+3. Make some changes to the code or documentation.
+4. Commit your Changes (`git commit -m 'Add some AmazingFeature'`)
+5. Push to the Feature Branch (`git push origin feature/AmazingFeature`)
+6. Create a [New Pull Request](https://github.com/rp-rs/rp-hal/pulls)
+7. An admin will review the Pull Request and discuss any changes that may be required.
+8. Once everyone is happy, the Pull Request can be merged by an admin, and your work is part of our project!
+
+## Code of Conduct
+
+Contribution to this crate is organized under the terms of the [Rust Code of
+Conduct][CoC], and the maintainer of this crate, the [rp-rs team], promises
+to intervene to uphold that code of conduct.
+
+[CoC]: CODE_OF_CONDUCT.md
+[rp-rs team]: https://github.com/orgs/rp-rs/teams/rp-rs
+
+## License
+
+The contents of this repository are dual-licensed under the _MIT OR Apache
+2.0_ License. That means you can chose either the MIT licence or the
+Apache-2.0 licence when you re-use this code. See `MIT` or `APACHE2.0` for more
+information on each specific licence.
+
+Any submissions to this project (e.g. as Pull Requests) must be made available
+under these terms.