STM32 Web Flash

A Web Serial flasher for the STM32 factory UART bootloader, with an optional serial console.

Quick start (Docker)

1. docker compose up --build
2. Open http://localhost:8080

Quick start (local)

1. Serve this folder over HTTPS or localhost (Web Serial requires a secure context).
2. Put your STM32 into the system bootloader (BOOT0 high, reset).
3. Connect USB-to-UART (CDC) and click Connect.
4. Select a firmware.bin and click Flash firmware.

Notes

• Bootloader uses 8 data bits, even parity, 1 stop bit. This is set automatically.
• Serial console uses 8-N-1. You can set its baud rate separately.
• Flash address defaults to 0x08000000. Adjust if your memory map differs.
• Mass erase uses the bootloader erase command (0x43/0x44/0x45).
• Web Serial is supported in Chromium-based browsers (Chrome/Edge).
• Web assets are served from docs/ for GitHub Pages compatibility.

License

Licensed under the Apache License, Version 2.0.
See the LICENSE file for details.

Contributing

Contributions are welcome! Please open issues or pull requests on GitHub.

By contributing, you agree that your contributions are licensed under Apache 2.0.