Belkin F8E211 Uživatelská příručka stáhnout pdf (Strana 94)

usbd

Get speciﬁc device status

Synopsis:

#include <sys/usbdi.h>

int usbd_status( struct usbd_device *device,

_uint16 rtype,

_uint16 index,

void *addr,

_uint32 len )

Arguments:

device An opaque handle used to identify the USB 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.

addr Address for start of transfer — you must use the buffer allocated by

usbd

alloc().

len The length (in bytes) of the data transfer.

Library:

libusbdi

Description:

You use the usbd

status() function to get speciﬁc device status.

Returns:

EOK Success.

EMSGSIZE Buffer too small for descriptor.

ENOMEM No memory for URB.

ENODEV Device was removed.

Classiﬁcation:

QNX Neutrino, QNX 4

80 Chapter 4 • USB Library Reference September 10, 2007

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Belkin F8E211 Uživatelská příručka Strana 94