Belkin F8E211 Guia do Utilizador descarregar pdf (Página 56)

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

Get the device descriptor for a speciﬁc device

Synopsis:

#include <sys/usbdi.h>

usbd

device descriptor t

*usbd

device descriptor(

struct usbd

device *device,

struct usbd

desc node **node );

Description:

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

descriptor for a speciﬁc device (a handle from usbd

attach()).

The node parameter tells you where a descriptor was found to root

future requests from (e.g. conﬁgurations of the device).

The

usbd device descriptor t structure looks like this:

typedef struct usbd device descriptor {

uint8 bLength;

uint8 bDescriptorType;

uint16 bcdUSB;

uint8 bDeviceClass;

uint8 bDeviceSubClass;

uint8 bDeviceProtocol;

uint8 bMaxPacketSize0;

uint16 idVendor;

uint16 idProduct;

uint16 bcdDevice;

uint8 iManufacturer;

uint8 iProduct;

uint8 iSerialNumber;

uint8 bNumConfigurations;

} usbd

device descriptor t;

Returns:

A pointer to usbd device descriptor t on success, or NULL

on error.

44 Chapter 4 USB Library Reference November 2, 2006

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Belkin F8E211 Guia do Utilizador Página 56