Appendix E: Usb Enumeration - XMOS VocalFusion XVF3510 User Manual

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
DESCRIPTION DEVICE TYPE
NAME
XVF3510 USB
(UAC1.0) Composite Unknown
Adaptive Device
XVF3510
USB Audio
(UAC1.0) Audio
Device
Adaptive
XVF3510
XMOS Vendor
(UAC1.0)
Control Specific
Adaptive
XVF3510 HID (Human
USB Input
(UAC1.0) Interface
Device
Adaptive Device)
During USB enumeration, the XVF3510 HID produces three descriptors. The listing below shows them
as recorded on Windows using
USB Specification v2.0
descriptors, see the
for Human Interface Devices (HID) v1.11
===>Interface Descriptor<===
bLength:
bDescriptorType:
bInterfaceNumber:
bAlternateSetting:
bNumEndpoints:
bInterfaceClass:
bInterfaceSubClass:
bInterfaceProtocol:
iInterface:
===>HID Descriptor<===
bLength:
bDescriptorType:
bcdHID:
bCountryCode:
bNumDescriptors:
bDescriptorType:
wDescriptorLength:
===>Endpoint Descriptor<===
bLength:
bDescriptorType:
bEndpointAddress:
bmAttributes:
wMaxPacketSize:
bInterval:
XM-014232-PC
VENDOR PRODUCT USB
ID ID CLASS SUBCLASS
20b1 0014 00
20b1 0014 01
20b1 0014 ff
20b1 0014 03
USB View. For details of the structure and meaning of these
sections 9.6.5 and 9.6.6 and the
section 6.2.1.
0x09
0x04
0x04
0x00
0x01
0x03 -> HID Interface Class
0x00
0x00
0x00
0x09
0x21
0x0110
0x00
0x01
0x22 (Report Descriptor)
0x002B
0x07
0x05
0x82 -> Direction: IN - EndpointID: 2
0x03 -> Interrupt Transfer Type
0x0040 = 0x40 bytes
0x08
USB USB SERVICE
PROTOCOL NAME
00 00 usbccgp 2.00
01 00 usbaudio 2.00
ff ff
00 00 HidUsb
Device Class Definition
USB DRIVER
VERSION DESCRIPTION
USB
Composite
Device
USB Audio
Device
2.00
USB Input
2.00
Device
78