Belkin F8E211 Podręcznik Użytkownika Pobierz pdf (Strona 66)

usbd

interface

Get the interface descriptor for a speciﬁc interface setting

Synopsis:

#include <sys/usbdi.h>

usbd_interface_descriptor_t

*usbd_interface_descriptor(

struct usbd_device *device,

_uint8 cfg,

_uint8 ifc,

_uint8 alt,

struct usbd_desc_node **node );

Arguments:

device An opaque handle used to identify the USB device.

cfg The device’s conﬁguration identiﬁer (

bConfigurationValue).

ifc Interface identiﬁer (

bInterfaceNumber).

alt Alternate identiﬁer (

bAlternateSetting).

node Indicates the descriptor’s location for rooting future requests (e.g.

endpoints of this interface).

Library:

libusbdi

Description:

The usbd

interface

descriptor() function lets you obtain the interface descriptor for a

speciﬁc interface setting.

The

usbd_interface_descriptor_t structure looks like this:

typedef struct usbd_interface_descriptor {

_uint8 bLength;

_uint8 bDescriptorType;

_uint8 bInterfaceNumber;

_uint8 bAlternateSetting;

_uint8 bNumEndpoints;

_uint8 bInterfaceClass;

_uint8 bInterfaceSubClass;

_uint8 bInterfaceProtocol;

_uint8 iInterface;

} usbd_interface_descriptor_t;

52 Chapter 4 • USB Library Reference September 10, 2007

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