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usbd

urb

Return status information on a URB

Synopsis:

#include <sys/usbdi.h>

int usbd_urb_status( struct usbd_urb *urb,

_uint32 *status,

_uint32 *len )

Arguments:

urb An opaque handle (from usbd

alloc

urb()).

status Completion status (see below).

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

Library:

libusbdi

Description:

You use the usbd

urb

status() function to extract completion status and data-transfer

length from a URB.

Completion status

The status ﬁeld contains the completion status information, which includes the

following ﬂags:

USBD_STATUS_INPROG

The operation is in progress.

USBD_STATUS_CMP

The operation is complete.

USBD_STATUS_CMP_ERR

The operation is complete, but an error occurred.

USBD_STATUS_TIMEOUT

The operation timed out.

USBD_STATUS_ABORTED

The operation aborted.

USBD_STATUS_CRC_ERR

The last packet from the endpoint contained a CRC error.

86 Chapter 4 • USB Library Reference September 10, 2007

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Belkin F8E211 Guida Utente Pagina 100