USB 2.0

Axon has two USB 2.0 port ( 480 Mbps ). This guide explains how to use and inspect USB 2.0 interfaces on a Linux system.

../../../../_images/axon-usb2.webp

Basic Utilities and Commands

List Connected USB Devices

Use lsusb to display information about USB buses and the devices connected to them.

vicharak@vicharak:~$ lsusb -t
/:  Bus 003.Port 001: Dev 001, Class=root_hub, Driver=ehci-platform/1p, 480M
/:  Bus 004.Port 001: Dev 001, Class=root_hub, Driver=ohci-platform/1p, 12M
/:  Bus 005.Port 001: Dev 001, Class=root_hub, Driver=ohci-platform/1p, 12M
/:  Bus 006.Port 001: Dev 001, Class=root_hub, Driver=ehci-platform/1p, 480M
    |__ Port 001: Dev 005, If 0, Class=Mass Storage, Driver=usb-storage, 480M

What it shows:

  • USB Bus number (Bus 003, 004, 005 and 006)

  • Device number (Device 001)

  • Vendor ID and Product ID

  • Manufacturer and device name

To get verbose information:

lsusb -v

To filter by a specific device ID:

lsusb -d <vendor>:<product>

USB Device Speed and Topology

Use usb-devices to print detailed information:

usb-devices

Or read from /sys directly:

cat /sys/bus/usb/devices/usb*/speed

Mount USB Storage Devices

Check kernel log after device is plugged in:

dmesg | grep -i usb

Find your device (e.g., /dev/sda1) and mount it:

sudo fdisk -l
sudo mount /dev/sda1 /mnt

To unmount:

sudo umount /mnt

Live USB Debugging

Use dmesg to view logs:

dmesg | grep -i usb

dmesg -w   # watch live

USB Command Reference

This section lists common Linux commands used to interact with USB devices.

Command

Description

lsusb

List USB devices

usb-devices

Detailed USB device info

dmesg

Kernel logs and hotplug info

mount

Mount USB storage device

Note

Speed values:

  • 1.5 Mbps - USB 1.1 (Low Speed)

  • 12 Mbps - USB 1.1 (Full Speed)

  • 480 Mbps - USB 2.0 (High Speed)

  • 5000 Mbps - USB 3.0 / USB 3.1 Gen1 (SuperSpeed)