Debugging Usually Slightly Broken (USB) Devices and Drivers
Talkat Embedded Linux Conference + OpenIoT Summit North America 2017 · on Tuesday, 2017-02-21· at 15:00· Skyline II·
summary
Covers USB descriptors, Linux matching and how to force or change bindings by writing to sysfs (for example echo 04e8 6860 > driver/g_serial/new_id), shows using interface authorization and device authorization to block or permit functions, demonstrates building a gadget with ConfigFS on an Odroid and getting a TTY, and uses usbmon + Wireshark to capture transfer-level traffic (notes usbmon shows transfers only, not low-level transactions; hardware analyzers cost more).
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chapters (32)
- 0:00Intro
- 1:42This presentation...
- 2:28What USB is about?
- 3:38Endpoints...
- 4:57Endpoint types
- 7:14USB descriptors
- 9:00USB classes
- 10:45Step by step
- 12:00USB Device Details
- 13:11What USB driver really is?
- 14:16How driver is chosen?
- 14:43USB device identity
- 15:54USB Host Big Picture
- 16:46Automation is good...
- 17:54sys/bus/usb/devices/demystified
- 19:17Limit number of allowed devices
- 20:26Use only subset of functionality
- 21:52Change configuration
- 22:10Add Device ID to driver
- 23:14Dynamic IDs formats
- 24:45Bind/Unbind particular interface Check which driver is bound
- 34:08USB bus
- 34:38USB transfer vs transaction
- 35:42USB Request Block
- 37:49Typical USB driver
- 39:06Typical bugs?
- 41:25HW USB sniffers - Commercial
- 42:10HW USB sniffers - Open Hardware
- 42:49USB Mon
- 44:14Data validity
- 44:38Good old friend Wireshark
- 47:54Summary
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