usbd_urb_status()

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.

USBD_STATUS_BITSTUFFING

The last packet from the endpoint contained a bit-stuffing violation.

USBD_STATUS_TOGGLE_MISMATCH

The last packet from the endpoint had the wrong data-toggle PID.

USBD_STATUS_STALL

The endpoint returned a STALL PID.

USBD_STATUS_DEV_NOANSWER

Device didn't respond to token (IN) or didn't provide a handshake (OUT).

USBD_STATUS_PID_FAILURE

Check bits on PID from endpoint failed on data PID (IN) or handshake (OUT).

USBD_STATUS_BAD_PID

Receive PID was invalid or undefined.

USBD_STATUS_DATA_OVERRUN

The endpoint returned more data than the allowable maximum.

USBD_STATUS_DATA_UNDERRUN

The endpoint didn't return enough data to fill the specified buffer.

USBD_STATUS_BUFFER_OVERRUN

During an IN, the host controller received data from the endpoint faster than it could be written to system memory.

USBD_STATUS_BUFFER_UNDERRUN

During an OUT, the host controller couldn't retrieve data fast enough.

USBD_STATUS_NOT_ACCESSED

Controller didn't execute request.

Returns:

EOK

Success.

EBUSY

URB I/O still active.

ETIMEDOUT

Timeout occurred.

EINTR

Operation aborted/interrupted.

ENODEV

Device removed.

EIO

I/O error.

Classification:

QNX Neutrino, QNX 4

See also:

usbd_args_lookup(), usbd_configuration_descriptor(), usbd_device_lookup(), usbd_device_extra(), usbd_device_descriptor(), usbd_endpoint_descriptor(), usbd_hcd_info(), usbd_hub_descriptor(), usbd_interface_descriptor(), usbd_languages_descriptor(), usbd_parse_descriptors(), usbd_string()