USB enumeration

The XVF3610 includes a Human Interface Device (HID) endpoint to enable the XVF3610 to signal interrupts caused by GPIO events. The table below shows how the XVF3610 HID appears on Windows using USB view.

Table 31 USB HID Endpoint

Device Name

Description

Device Type

Vendor ID

Product ID

USB Class

USB SubClass

USB Protocol

Service Name

USB Version

Driver Description

XVF3610 (UAC1.0) Adaptive

USB Composite Device

Unknown

20b1

16

0

0

0

usbccgp

2

USB Composite Device

XVF3610 (UAC1.0) Adaptive

USB Audio Device

Audio

20b1

16

1

1

0

usbaudio

2

USB Audio Device

XVF3610 (UAC1.0) Adaptive

XMOS Control

Vendor Specific

20b1

16

ff

ff

ff

2

XVF3610 (UAC1.0) Adaptive

USB Input Device

HID (Human Interface Device)

20b1

16

3

0

0

HidUsb

2

USB Input Device

During USB enumeration, the XVF3610 HID produces three descriptors. The listing below shows them as recorded on Windows using USB View. For details of the structure and meaning of these descriptors, see the USB Specification v2.0 sections 9.6.5 and 9.6.6 and the Device Class Definition for Human Interface Devices (HID) v1.11 section 6.2.1.

===>Interface Descriptor<===
bLength: 0x09
bDescriptorType: 0x04
bInterfaceNumber: 0x04
bAlternateSetting: 0x00
bNumEndpoints: 0x01
bInterfaceClass: 0x03 -> HID Interface Class
bInterfaceSubClass: 0x00
bInterfaceProtocol: 0x00
iInterface: 0x00
===>HID Descriptor<===
bLength: 0x09
bDescriptorType: 0x21
bcdHID: 0x0110
bCountryCode: 0x00
bNumDescriptors: 0x01
bDescriptorType: 0x22 (Report Descriptor)
wDescriptorLength: 0x006E
===>Endpoint Descriptor<===
bLength: 0x07
bDescriptorType: 0x05
bEndpointAddress: 0x82 -> Direction: IN - EndpointID: 2
bmAttributes: 0x03 -> Interrupt Transfer Type
wMaxPacketSize: 0x0040 = 0x40 bytes
bInterval: 0x08

NOTE: If the SET_HID_USAGE command has been used to change the meaning of a bit in the HID Report, the wDescriptorLength field of the HID Descriptor may contain a different value. See the USB HID Interface portion of section 4.3.1, USB Interface, for information on using the SET_HID_USAGE command.