STM32 Flashing & Hardware Control MCP Server (stmctl-mcp)

A production-grade Model Context Protocol (MCP) server wrapping STM32CubeCLT (STM32_Programmer_CLI.exe). This MCP server enables any AI coding assistant or agent framework (Antigravity, Claude Desktop, Cursor, custom Node.js/Python agents) to perform hardware flashing, memory dumps, option byte modification, chip erase, board resets, and live SWO printf log tracing.

Hardware & Software Requirements

1. Host Computer Requirements

• Node.js: v18.0.0 or higher

• Operating System: Windows 10 / 11, Linux, or macOS

2. Platform Installation Scripts (scripts/)

Automated installer & environment setup scripts are provided in the scripts/ folder:

• Windows: scripts/install_win.bat

• Linux: scripts/install_linux.sh (Includes ST-LINK USB udev permission rules setup)

• macOS: scripts/install_mac.sh (Includes Homebrew stlink fallback check)

Related MCP server: jlink-mcp

Flexible Path Configuration & Dynamic Resolution Hierarchy

To accommodate different computers, OS environments, and version numbers (e.g., STM32CubeCLT_1.17.0, 1.22.0, 2.0.0), stmctl-mcp resolves STM32_Programmer_CLI.exe using the following priority sequence:

Priority 1: Local Configuration File (stmctl_config.json)

You can manually specify any custom path in stmctl_config.json in the server root directory:

{
  "cli_path": "C:\\MyCustomPath\\STM32_Programmer_CLI.exe",
  "default_port": "SWD",
  "default_mode": "HOTPLUG"
}

Priority 2: Environment Variable

Set STM32_PROGRAMMER_CLI_PATH in your environment or MCP launcher configuration:

STM32_PROGRAMMER_CLI_PATH=C:\ST\STM32CubeCLT_1.22.0\STM32CubeProgrammer\bin\STM32_Programmer_CLI.exe

Priority 3: Automatic Dynamic Version Scanning (C:\ST\STM32CubeCLT_*)

If no manual path is specified, stmctl-mcp automatically scans C:\ST\ for **any installed version number** (sorting highest version first) to locate: C:\ST\STM32CubeCLT_<version>\STM32CubeProgrammer\bin\STM32_Programmer_CLI.exe

Priority 4: Standard Program Files Directories

Scans standard Program Files, Program Files (x86), /usr/local/STMicroelectronics/..., /opt/st/..., and /Applications/... directories.

Priority 5: System PATH Fallback

Tries executing STM32_Programmer_CLI directly from system environment PATH.

Capabilities & Tools Exposed

1. stm32_list_probes: Discover connected ST-LINK, J-Link, UART COM ports, USB devices.

2. stm32_connect_info: Query chip ID, Flash/RAM size, revision ID, CPU core.

3. stm32_flash_firmware: Program .bin, .hex, .elf, .srec files with automatic erase, verification, reset, and run flags.

4. stm32_erase_memory: Perform full chip mass erase or sector/page erase.

5. stm32_read_memory: Read raw memory addresses or dump to .bin/.hex files.

6. stm32_write_memory: Write bytes/words to specific memory addresses or peripheral registers.

7. stm32_read_option_bytes: Read RDP protection level, BOR level, Watchdog, and Boot flags.

8. stm32_write_option_bytes: Modify Option Bytes (e.g. RDP=0xAA, nBOOT0=1).

9. stm32_reset_mcu: Hardware (HWrst), Software (SWrst), or Core (Crst) reset.

10. stm32_run_mcu: Start or resume program execution at specified address.

11. stm32_start_swv_trace: Stream/capture live SWO Serial Wire Viewer printf logs.

12. stm32_raw_cli: Direct passthrough for any custom STM32_Programmer_CLI flags.

Installation & Build

1. Install Dependencies

npm install

2. Build TypeScript Source

npm run build

This compiles TypeScript files into ./dist/index.js.

How to Integrate stmctl-mcp into Any Agent

Method 1: Desktop IDEs & Apps (Antigravity, Claude Desktop, Cursor, VS Code)

Add the JSON configuration block below to your application's MCP settings file (e.g., claude_desktop_config.json or .vscode/mcp.json):

{
  "mcpServers": {
    "stmctl-mcp": {
      "command": "node",
      "args": [
        "c:/Users/kunur/OneDrive/Documents/Smarttrak/Firmware_Agent/STMCTL_MCP/dist/index.js"
      ]
    }
  }
}

Method 2: Custom Node.js / TypeScript Agent

import { Client } from "@modelcontextprotocol/sdk/client/index.js";
import { StdioClientTransport } from "@modelcontextprotocol/sdk/client/stdio.js";

async function main() {
  const transport = new StdioClientTransport({
    command: "node",
    args: ["c:/Users/kunur/OneDrive/Documents/Smarttrak/Firmware_Agent/STMCTL_MCP/dist/index.js"],
  });

  const client = new Client({ name: "firmware-agent-host", version: "1.0.0" }, { capabilities: {} });
  await client.connect(transport);

  const probeResult = await client.callTool({
    name: "stm32_list_probes",
    arguments: {},
  });
  console.log("Probes Result:", probeResult.content[0].text);
}

main().catch(console.error);

Method 3: Custom Python Agent (LangChain / LlamaIndex / CrewAI / AutoGen)

import asyncio
from mcp import ClientSession, StdioServerParameters
from mcp.client.stdio import stdio_client

async def run_firmware_agent():
    server_params = StdioServerParameters(
        command="node",
        args=["c:/Users/kunur/OneDrive/Documents/Smarttrak/Firmware_Agent/STMCTL_MCP/dist/index.js"],
    )

    async with stdio_client(server_params) as (read, write):
        async with ClientSession(read, write) as session:
            await session.initialize()
            result = await session.call_tool("stm32_list_probes", arguments={})
            print("Probe Result:", result.content[0].text)

asyncio.run(run_firmware_agent())

Method 4: Interactive Web Browser Debugging (MCP Inspector)

npm run inspector

This opens the MCP Inspector UI at http://localhost:5173.