Belkin F8E211 Guia do Utilizador descarregar pdf (Página 74)

usbd interface descriptor()  2006, QNX Software Systems GmbH & Co. KG.

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 );

Description:

The usbd interface descriptor() function lets you obtain the interface

descriptor for a speciﬁc interface setting.

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).

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;

62 Chapter 4 USB Library Reference November 2, 2006

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