Belkin F8E211 Guía de usuario descargar pdf (Pagina 45)

 2006, QNX Software Systems GmbH & Co. KG.

usbd conﬁguration descriptor()

Get the conﬁguration descriptor for a speciﬁc conﬁguration setting

Synopsis:

#include <sys/usbdi.h>

usbd

configuration descriptor t

*usbd

configuration descriptor(

struct usbd

device *device,

uint8 cfg,

struct usbd

desc node **node );

Description:

The usbd conﬁguration descriptor() function lets you obtain the

conﬁguration descriptor for a speciﬁc conﬁguration setting.

device An opaque handle used to identify the USB device.

cfg The device’s conﬁguration identiﬁer

(

bConfigurationValue).

node Indicates the descriptor’s location for rooting future

requests (e.g. interfaces of this conﬁguration).

The

usbd configuration descriptor t structure looks like

this:

typedef struct usbd configuration descriptor {

uint8 bLength;

uint8 bDescriptorType;

uint16 wTotalLength;

uint8 bNumInterfaces;

uint8 bConfigurationValue;

uint8 iConfiguration;

uint8 bmAttributes;

uint8 MaxPower;

} usbd

configuration descriptor t;

November 2, 2006 Chapter 4 USB Library Reference 33

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Belkin F8E211 Guía de usuario Pagina 45