XMOS VocalFusion XVF3510, User Manual

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XM-014232-PC 78
APPENDIX E: USB ENUMERATION
The XVF3510 includes a Human Interface Device (HID) endpoint to enable the XVF3510 to signal
interrupts caused by GPIO events. The table below shows how the XVF3510 HID appears on Windows
using the Microsoft Universal Serial Bus Viewer (USBView).
DEVICE
NAME
DESCRIPTION DEVICE TYPE
VENDOR
ID
PRODUCT
ID
USB
CLASS
USB
SUBCLASS
USB
PROTOCOL
SERVICE
NAME
USB
VERSION DRIVER
DESCRIPTION
XVF3510
(UAC1.0)
Adaptive USB
Composite
Device
Unknown 20b1 0014 00 00 00 usbccgp 2.00
USB
Composite
Device
XVF3510
(UAC1.0)
Adaptive
USB Audio
Device
Audio 20b1 0014 01 01 00 usbaudio 2.00
USB Audio
Device
XVF3510
(UAC1.0)
Adaptive
XMOS
Control Vendor
Specific
20b1 0014 ff ff ff 2.00
XVF3510
(UAC1.0)
Adaptive
USB Input
Device
HID (Human
Interface
Device)
20b1 0014 03 00 00 HidUsb 2.00
USB Input
Device
During USB enumeration, the XVF3510 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: 0x002B
===>Endpoint Descriptor<===
bLength: 0x07
bDescriptorType: 0x05
bEndpointAddress: 0x82 -> Direction: IN - EndpointID: 2
bmAttributes: 0x03 -> Interrupt Transfer Type
wMaxPacketSize: 0x0040 = 0x40 bytes
bInterval: 0x08