Belkin F8E211 Guía de usuario descargar pdf (Pagina 72)

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

Get the hub descriptor for a speciﬁc (hub) device

Synopsis:

#include <sys/usbdi.h>

usbd

hub descriptor t *usbd hub descriptor(

struct usbd

device *device,

struct usbd

desc node **node );

Description:

The usbd hub descriptor() function lets you obtain a hub descriptor.

device An opaque handle used to identify the USB device.

node Indicates the descriptor’s location for rooting future

requests.

The

usbd hub descriptor t data structure looks like this:

typedef struct usbd hub descriptor {

uint8 bLength;

uint8 bDescriptorType;

uint8 bNbrPorts;

uint16 wHubCharacteristics;

uint8 bPwrOn2PwrGood;

uint8 bHubContrCurrent;

uint8 DeviceRemovable[1];

uint8 PortPwrCtrlMask[1];

} usbd

hub descriptor t;

Returns:

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

error.

Classiﬁcation:

QNX Neutrino, QNX 4

60 Chapter 4 USB Library Reference November 2, 2006

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Belkin F8E211 Guía de usuario Pagina 72