esp32

Rust with Xtensa support for Nix using flakes.

$ nix flake show github:knarkzel/esp32
└───packages
    └───x86_64-linux
        └───esp32: package 'esp32'
$ nix build github:knarkzel/esp32#esp32
$ ls -a result
.  ..  .cargo  .rustup

Minimal example

{
  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    esp32 = {
      url = "github:knarkzel/esp32";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs = {
    self,
    nixpkgs,
    esp32,
  }: let
    pkgs = import nixpkgs {system = "x86_64-linux";};
    idf-rust = esp32.packages.x86_64-linux.esp32;
  in {
    devShells.x86_64-linux.default = pkgs.mkShell {
      buildInputs = [
        idf-rust
      ];

      shellHook = ''
        export PATH="${idf-rust}/.rustup/toolchains/esp/bin:$PATH"
        export RUST_SRC_PATH="$(rustc --print sysroot)/lib/rustlib/src/rust/src"
      '';
    };
  };
}

Getting started

Use the above flake, then follow the Rust on ESP Book.

Notes

When building from source, you need a huge amount of memory, about 36 GB. To create temporary swap, use following commands:

$ fallocate -l 36G /tmp/swap; mkswap /tmp/swap; swapon /tmp/swap