Initialize pico project

flake.nix

@@ -0,0 +1,30 @@
+{
+  inputs = {
+    crane.url = "github:ipetkov/crane";
+    flake-utils.url = "github:numtide/flake-utils";
+    fenix.url = "github:nix-community/fenix";
+    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+  };
+
+  outputs = {
+    self,
+    crane,
+    fenix,
+    flake-utils,
+    nixpkgs,
+  }:
+    flake-utils.lib.eachDefaultSystem (system: let
+      pkgs = nixpkgs.legacyPackages.${system};
+      fenixPkgs = fenix.packages.${system};
+      craneLib = crane.mkLib pkgs;
+    in {
+
+      devShells.default = craneLib.devShell {
+        packages = with pkgs; [
+          fenixPkgs.rust-analyzer
+          elf2uf2-rs
+        ];
+        RUST_SRC_PATH = "${fenixPkgs.complete.rust-src}/lib/rustlib/src/rust/library";
+      };
+    });
+}