USBTrace : Class Decoding : Hub

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USB devices which belong to the Hub class can be monitored using the Hub class decoder (Plug-in dll). The decoder will monitor Hub class specific requests as well as internal Hub specific USB IOCTLs. Hub descriptor is displayed by USBTrace in device information view.

The Hub class requests decoded are:

GET STATUS

CLEAR FEATURE

GET STATE

SET FEATURE

GET DESCRIPTOR

SET DESCRIPTOR

CLEAR TT BUFFER

RESET TT

GET TT STATE

STOP TT

The following internal USB (Hub Specific) IOCTLs are monitored:

IOCTL_INTERNAL_USB_RESET_PORT

IOCTL_INTERNAL_USB_GET_ROOTHUB_PDO

IOCTL_INTERNAL_USB_GET_PORT_STATUS

IOCTL_INTERNAL_USB_ENABLE_PORT

IOCTL_INTERNAL_USB_GET_HUB_COUNT

IOCTL_INTERNAL_USB_CYCLE_PORT

IOCTL_INTERNAL_USB_GET_HUB_NAME

IOCTL_INTERNAL_USB_GET_PARENT_HUB_INFO

Image below shows a Hub specific request, decoded and displayed by USBTrace.