This firmware, written in Rust using embedded-hal (rp235x-hal), is designed for the Raspberry Pi Pico 2 W platform using the RP2350 microcontroller. Its application is an environment-sensing device which can measure CO2 concentration in the atmosphere, ambient temperature and humidity.

Building

Prerequisites

Rust compiler & cargo package manager: https://www.rust-lang.org/
RPi Pico SDK: https://github.com/raspberrypi/pico-sdk
RPi picotool: https://github.com/raspberrypi/picotool
ARM bare metal compiler toolchain
- arm-none-eabi-gcc (& arm-none-eabi-newlib) on Arch Linux, your system may have different package names
The ARMv8 or RISC-V Rust toolchain:
- ARMv8: rustup target add thumbv8m.main-none-eabihf
- RISC-V: rustup target add riscv32imac-unknown-none-elf

Environment configuration

This build system assumes the environment variables: PICO_BOARD, PICO_PLATFORM & PICO_SDK_PATH are set. picotool should also be available in the PATH.

The env-vars.sh script sets these values to pico2_w, rp2350-arm-s and my personal Pico SDK path, respectively. The environment variable definitions in this file can be set with source ./scripts/env-vars.sh.

Compiling & running

cargo build (or cargo build --release)

If you wish to run the binary on your Pico (connected in BOOTSEL mode):

cargo run (or cargo run --release)