Belkin F8E211 Podręcznik Użytkownika Pobierz pdf (Strona 57)

feature()

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 );

Arguments:

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.

Library:

libusbdi

Description:

The usbd

feature() function lets you control a speciﬁc feature on a USB device.

Returns:

EOK Success.

ENOMEM No memory for URB.

ENODEV Device was removed.

EIO I/O error on USB device.

Classiﬁcation:

QNX Neutrino, QNX 4

September 10, 2007 Chapter 4 • USB Library Reference 43

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Belkin F8E211 Podręcznik Użytkownika Strona 57