Move mcu into full flake-parts module

mcu/default.nix

@@ -0,0 +1,40 @@
+{
+  perSystem = { libMy, pkgs, ... }: {
+    devenv.shells.mcu = libMy.withRootdir {
+      packages = with pkgs; [
+        gnumake
+        cmake
+        pkgsCross.arm-embedded.buildPackages.gdb # ARM one is broken
+        gcc-arm-embedded
+        python3
+        picotool
+        openocd-rp2040
+      ];
+
+      env = {
+        PICO_SDK_PATH = "${pkgs.pico-sdk}/lib/pico-sdk";
+      };
+
+      scripts = {
+        build.exec = ''
+          cmake -S . -B build -D CMAKE_BUILD_TYPE=Debug -D PICO_STDIO_SEMIHOSTING=1
+          cmake --build build --parallel
+        '';
+        build-rel.exec = ''
+          cmake -S . -B build-release -D CMAKE_BUILD_TYPE=Release
+          cmake --build build-release --parallel
+        '';
+        clean.exec = ''
+          rm -rf build/ build-release/
+        '';
+
+        ocd.exec = ''
+          openocd -f ${./tigard-swd.cfg} -f target/rp2040.cfg
+        '';
+        gdb.exec = ''
+          arm-none-eabi-gdb -x .gdbinit build/qclk.elf
+        '';
+      };
+    };
+  };
+}

mcu/devenv.nix

@@ -1,36 +0,0 @@
-{ pkgs, ... }: {
-  packages = with pkgs; [
-    gnumake
-    cmake
-    pkgsCross.arm-embedded.buildPackages.gdb # ARM one is broken
-    gcc-arm-embedded
-    python3
-    picotool
-    openocd-rp2040
-  ];
-
-  env = {
-    PICO_SDK_PATH = "${pkgs.pico-sdk}/lib/pico-sdk";
-  };
-
-  scripts = {
-    build.exec = ''
-      cmake -S . -B build -D CMAKE_BUILD_TYPE=Debug -D PICO_STDIO_SEMIHOSTING=1
-      cmake --build build --parallel
-    '';
-    build-rel.exec = ''
-      cmake -S . -B build-release -D CMAKE_BUILD_TYPE=Release
-      cmake --build build-release --parallel
-    '';
-    clean.exec = ''
-      rm -rf build/ build-release/
-    '';
-
-    ocd.exec = ''
-      openocd -f ${./tigard-swd.cfg} -f target/rp2040.cfg
-    '';
-    gdb.exec = ''
-      arm-none-eabi-gdb -x .gdbinit build/qclk.elf
-    '';
-  };
-}