zephyr-nix

Develop Zephyr projects using Nix

Features

• SDK packaging

  • sdk

  The minimal SDK. Can be overriden with additional targets.

  sdk.override {
    targets = [
      "arm-zephyr-eabi"
    ];
  }

  • sdkFull

  SDK with all targets enabled.

• Host tools packaging

  • hosttools

  Binary hosttools from the Zephyr SDK. Because of libc incompatibilities not all binaries in this derivation actually works.

  • hosttools-nix

  A re-packaging of the Zephyr SDK hosttools using nixpkgs packages.

Basic usage

• shell.nix

{ mkShell
, zephyr
, callPackage
, cmake
, ninja
, lib
}:

mkShell {
  packages = [
    (zephyr.sdk.override {
      targets = [
        "arm-zephyr-eabi"
      ];
    })
    zephyr.pythonEnv
    # Use zephyr.hosttools-nix to use nixpkgs built tooling instead of official Zephyr binaries
    zephyr.hosttools
    cmake
    ninja
  ];

}

Flakes usage

• flake.nix

{
  description = "A very basic Zephyr flake";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";

    # Customize the version of Zephyr used by the flake here
    zephyr.url = "github:zephyrproject-rtos/zephyr/v3.5.0";
    zephyr.flake = false;

    zephyr-nix.url = "github:adisbladis/zephyr-nix";
    zephyr-nix.inputs.nixpkgs.follows = "nixpkgs";
    zephyr-nix.inputs.zephyr.follows = "zephyr";
  };

  outputs = { self, nixpkgs, zephyr-nix, ... }: let
    pkgs = nixpkgs.legacyPackages.x86_64-linux;
    zephyr = zephyr-nix.packages.x86_64-linux;
  in {
    devShells.x86_64-linux.default = pkgs.mkShell {
      # Use the same mkShell as documented above
    };
  };
}

Using specific SDK versions

zephyr-nix packages multiple Zephyr SDK versions that can be accessed by their versioned attributes.

• Classic Nix

{ pkgs, zephyr-nix }:
pkgs.mkShell {
  packages = [
    zephyr-nix.sdks."0.16".sdkFull
  ];
}

• Flakes

Flake output schema requires packages to be flat, so the nested SDKs sets are folded into the top-level:

devShells.x86_64-linux.default = pkgs.mkShell {
  packages = [
    zephyr-nix.packages.x86_64-linux.sdkFull-0_16
  ];
};

Building a west project with Nix

For building west projects with Nix you can use west2nix.