Cynthion is an all-in-one tool for building, testing, monitoring, and experimenting with USB devices. Built around a unique FPGA-based architecture, Cynthion’s digital hardware can be fully customized to suit the application at hand. As a result, it can act as a no-compromise High-Speed USB protocol analyzer, a USB-hacking multi-tool, or a USB development platform.
Out-of-the-box, Cynthion acts as a USB protocol analyzer capable of capturing and analyzing traffic between a host and any Low-, Full-, or High-Speed ("USB 2.0") USB device. It works seamlessly with our open-source analysis software.
Combined with our LUNA gateware and Facedancer libraries, Cynthion becomes a versatile USB-hacking and development tool. Facedancer makes it quick and easy to create or tamper with real USB devices—not just emulations—even if you don’t have experience with digital-hardware design, HDL, or FPGA architecture!
For more information, see the Cynthion Crowd Supply page.
This project is broken down into several directories:
docs/-- sources for the Cynthion Sphinx documentationcynthion/python/-- sources for the maincynthionpython module and amaranth gateware.cynthion/rust/-- sources for the maincynthionrust crate.firmware/-- sources for Cynthion firmware.shared/-- a collection of toml files containing values shared between host code, gateware and firmware.util/-- miscellaneous support files for Cynthion
Cynthion's documentation is captured on Read the Docs. Raw documentation sources are in the docs/ folder.
Cynthion is supported by two additional firmware projects: