Belkin F8E211 Guía de usuario descargar pdf (Pagina 64)

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

Control a feature for a USB device.

Synopsis:

#include <sys/usbdi.h>

int usbd

feature( struct usbd device *device,

int set,

uint16 feature,

uint16 rtype, uint16 index );

Description:

The usbd feature() function lets you control a speciﬁc feature on a

USB device.

device An opaque handle used to identify the USB device.

set Set or clear a feature on the USB device.

feature A speciﬁc feature on the device.

rtype Type of request (e.g.

USB RECIPIENT DEVICE,

USB RECIPIENT INTERFACE,

USB RECIPIENT ENDPOINT, USB RECIPIENT OTHER,

USB TYPE STANDARD, USB TYPE CLASS,

USB TYPE VENDOR).

index This varies, depending on the request. It’s used for

passing a parameter to the device.

Returns:

EOK Success.

ENOMEM No memory for URB.

ENODEV Device was removed.

EIO I/O error on USB device.

52 Chapter 4 USB Library Reference November 2, 2006

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Belkin F8E211 Guía de usuario Pagina 64