init

.gitignore

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+result*

README.md

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+# nix-mdk
+
+this is a nix flake for the [mdk](https://github.com/cpq/mdk) single-header ESP32C3 SDK. It also provides the awesome [esputil](https://github.com/cpq/esputil) flashing utility.
+
+## todo
+
+- add support for ESP32

flake.lock

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+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1767313136,
+        "narHash": "sha256-16KkgfdYqjaeRGBaYsNrhPRRENs0qzkQVUooNHtoy2w=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "ac62194c3917d5f474c1a844b6fd6da2db95077d",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-25.05",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+{
+  inputs.nixpkgs.url = "github:nixos/nixpkgs/nixos-25.05";
+  outputs = {
+    nixpkgs,
+    self,
+    ...
+  }: let
+    pkgs = nixpkgs.legacyPackages.x86_64-linux;
+    src = pkgs.fetchzip {
+      url = "https://github.com/cpq/mdk/archive/e2c1d4e4bd9b152dfa32b48a7c0ae5f5a8b8276d.zip";
+      sha256 = "sha256-IBlM/c75KscqxKccGbiiiyjcxyLvUQb+ycHFGEpFAn8=";
+    };
+    esp32c3example = {exampleName}: (pkgs.callPackage ({
+      pkgsCross,
+      gitMinimal,
+      fetchzip,
+      esputil,
+      lib,
+      ...
+    }:
+      pkgsCross.riscv64-embedded.stdenv.mkDerivation {
+        pname = "esp32c3-${exampleName}";
+        version = "0.0.2";
+        inherit src;
+        MDK = "/build/source"; # so it jumps to build directory for
+        ARCH = "esp32c3";
+        TOOLCHAIN = "riscv64-none-elf";
+        nativeBuildInputs = [
+          gitMinimal
+        ];
+        patchPhase = ''
+          cp ${esputil}/bin/esputil esputil
+        '';
+        buildPhase = ''
+          git init
+          echo $ESPUTIL
+          make -C examples/${exampleName} build
+        '';
+        installPhase = ''
+          mkdir -p $out/bin
+          cp ./examples/${exampleName}/firmware.{bin,elf} $out/bin/
+          cat<<EOF>$out/bin/esp32c3-${exampleName}
+          #!/usr/bin/env bash
+          ${esputil}/bin/esputil flash 0 $(echo $out)/bin/firmware.bin
+          EOF
+          chmod +x $out/bin/esp32c3-${exampleName}
+        '';
+      }) {esputil = self.packages.x86_64-linux.esputil;});
+  in {
+    packages.x86_64-linux.esputil = pkgs.callPackage ({
+      stdenv,
+      fetchzip,
+      ...
+    }:
+      stdenv.mkDerivation {
+        pname = "esputil";
+        version = "1.0.1";
+        src = fetchzip {
+          url = "https://github.com/cpq/esputil/archive/refs/tags/1.0.1.zip";
+          sha256 = "sha256-yP/JPmk+5X7Ok89rOjqtiyQmIryxTiLZ0/Eil0XJHLA=";
+        };
+        installPhase = ''
+          mkdir -p $out/bin
+          cp ./esputil $out/bin/esputil -r
+        '';
+      }) {};
+    packages.x86_64-linux.esp32c3-blinky = esp32c3example {exampleName = "blinky";};
+    packages.x86_64-linux.esp32c3-bme280 = esp32c3example {exampleName = "bme280";};
+    packages.x86_64-linux.esp32c3-button = esp32c3example {exampleName = "button";};
+    packages.x86_64-linux.esp32c3-ws2812 = esp32c3example {exampleName = "ws2812";};
+  };
+}