From 3f6f81f8ab2291840a78450bdcb8e93b80e759bc Mon Sep 17 00:00:00 2001
From: Kenryu Shibata <kenryudev5894@gmail.com>
Date: Thu, 15 Oct 2026 00:52:05 +0900
Subject: [PATCH] initial commit

---
 flake.lock | 27 +++++++++++++++++
 flake.nix  | 85 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 112 insertions(+)
 create mode 100644 flake.lock
 create mode 100644 flake.nix

diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..47cfb45
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1791883866,
+        "narHash": "sha256-yvkDdToRZ4IgPc9tSBzzCYJvTLf8n5eE3rgUkpCuD5A=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "a033e66ab94a6bedf2c3d58d93a36319d3cbbbaf",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-26.05",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..6757e98
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,85 @@
+{
+  description = "ch32fun with devshell.";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-26.05";
+  };
+
+  outputs = inputs@{ self, nixpkgs }:
+  let
+    pkgs = import nixpkgs {
+      system = "x86_64-linux";
+    };
+    riscv32Pkgs = import nixpkgs {
+      system = "x86_64-linux";
+      crossSystem = {
+        system = "riscv32-none-elf";
+      };
+    };
+
+    ch32fun = pkgs.stdenv.mkDerivation {
+      pname = "ch32fun";
+      version = "1.0rc2";
+      src = pkgs.fetchgit {
+        url = "https://github.com/cnlohr/ch32fun.git";
+        rev = "72957fb697fe18c875f09126858c94c2590f9ae9";
+        hash = "sha256-xaSlC8R3mgSaodOWiRRWkVxcdikoDdSpUN31R2guBR4=";
+      };
+
+      buildInputs = with pkgs; [ coreutils udev libusb1 ];
+
+      postUnpack = ''
+        export sourceRoot="$sourceRoot/minichlink"
+      '';
+
+      installPhase = ''
+        runHook preInstall
+
+        mkdir -p $out/{share,src}
+        cp -rv ../ch32fun/ $out/src/
+        cp -rv ../extralibs/ $out/src/
+        cp -rv ../misc/ $out/src/
+        rm $out/src/ch32fun/README.md
+        sed -i 's/PREFIX_DEFAULT:=riscv64-elf/PREFIX_DEFAULT:=riscv32-unknown-none-elf/' $out/src/ch32fun/ch32fun.mk
+        sed -i 's/MINICHLINK?=$(CH32FUN)\/..\/minichlink/MINICHLINK?=$(CH32FUN)\/..\/..\/bin/' $out/src/ch32fun/ch32fun.mk
+        sed -i 's/GENERATED_LD_FILE:=$(CH32FUN)\/generated_$(TARGET_MCU_PACKAGE)_$(TARGET_MCU_MEMORY_SPLIT).ld/GENERATED_LD_FILE:=.\/generated_$(TARGET_MCU_PACKAGE)_$(TARGET_MCU_MEMORY_SPLIT).ld/' $out/src/ch32fun/ch32fun.mk
+
+        mkdir -p $out/{bin,lib}
+        mkdir -p $out/lib/udev/rules.d
+        cp -v minichlink $out/bin
+        cp -v minichlink.so $out/lib
+        cp -v 99-minichlink.rules $out/lib/udev/rules.d/
+
+        mkdir -p $out/share/{doc,examples}
+        ls -al $out/share/doc
+        cp -v ../ch32fun/README.md $out/share/doc
+        ls -al $out/share/doc
+        mv $out/share/doc/README.md $out/share/doc/compability.md
+        ls -al $out/share/doc
+        cp -v ../README.md $out/share/doc/README.md
+        ls -al $out/share/doc
+        cp -rv ../examples* $out/share/examples/
+        ls -al $out/share/doc
+
+        runHook postInstall
+      '';
+    };
+
+    whereis-ch32fun = pkgs.writeShellScriptBin "whereis-ch32fun" ''
+      echo "${ch32fun}/src/ch32fun"
+    '';
+
+    shellProfile = riscv32Pkgs.mkShell {
+      name = "WCH ch32";
+      packages = [
+        pkgs.wlink
+        ch32fun
+        whereis-ch32fun
+      ];
+    };
+  in
+  {
+      packages.x86_64-linux.default = ch32fun;
+      devShells.x86_64-linux.default = shellProfile;
+  };
+}