Using Cynthion with Packetry

Together with Packetry, Cynthion can be used as a USB 2.0 protocol analyzer capable of capturing and analyzing traffic between a host and any Low, Full, and High Speed USB device.

Before proceeding, please ensure you have completed all steps in the Getting Started with Cynthion section.

Prerequisites

To use Cynthion’s USB Analyzer you will need to ensure the following software is installed:

Packetry

USB Analyzer Bitstream

Cynthion ships from the factory with the USB Analyzer as the default bitstream for the FPGA.

If you have previously flashed a different default bitstream you can run the USB Analyzer bitstream with:

cynthion run analyzer

If you want to configure USB Analyzer as the default bitstream for the FPGA:

cynthion flash analyzer

You can verify that everything is working by running:

cynthion info

You should see output like:

Detected a Cynthion device!
    Bitstream: USB Analyzer (Cynthion Project)
    Hardware: Cynthion r1.4
    Flash UID: xxxxxxxxxxxxxxxx

Connect Hardware

Connection diagram for using Cynthion with Packetry.

Next, see the Packetry documentation for more detail, or the tutorial Protocol analysis of a USB keyboard for a worked example.