USB_INTERFACE_DESCRIPTOR structure (usbspec.h)
The USB_INTERFACE_DESCRIPTOR structure is used by USB client drivers to retrieve a USB-defined interface descriptor. The members of this structure are described in the Universal Serial Bus 3.1 Specification available at USB Document Library. See section 9.6.5.
Syntax
typedef struct _USB_INTERFACE_DESCRIPTOR {
UCHAR bLength;
UCHAR bDescriptorType;
UCHAR bInterfaceNumber;
UCHAR bAlternateSetting;
UCHAR bNumEndpoints;
UCHAR bInterfaceClass;
UCHAR bInterfaceSubClass;
UCHAR bInterfaceProtocol;
UCHAR iInterface;
} USB_INTERFACE_DESCRIPTOR, *PUSB_INTERFACE_DESCRIPTOR;
Members
bLength
The length, in bytes, of the descriptor.
bDescriptorType
The descriptor type. bDescriptor must be set to USB_INTERFACE_DESCRIPTOR_TYPE.
bInterfaceNumber
The index number of the interface.
bAlternateSetting
The index number of the alternate setting of the interface.
bNumEndpoints
The number of endpoints that are used by the interface, excluding the default status endpoint.
bInterfaceClass
The class code of the device that the USB specification group assigned.
bInterfaceSubClass
The subclass code of the device that the USB specification group assigned.
bInterfaceProtocol
The protocol code of the device that the USB specification group assigned.
iInterface
The index of a string descriptor that describes the interface. For information about this field, see section 9.6.5 in the "Universal Serial Bus Revision 2.0" specification at USB Technology.
Requirements
| Requirement | Value |
|---|---|
| Header | usbspec.h (include Usb100.h) |