usbd_setup_isochronous()

Set up a URB for an isochronous transfer

Synopsis:

#include <sys/usbdi.h>

int usbd_setup_isochronous( struct usbd_urb *urb,
                            _uint32 flags,
                            _int32 frame,
                            void *addr,
                            _uint32 len );

Arguments:

urb

An opaque handle (from usbd_alloc_urb()).

flags

One of the following:

• URB_DIR_IN—specify incoming (device-to-PC) transfer.
• URB_DIR_OUT—specify outgoing (PC-to-device) transfer.
• URB_DIR_NONE—don't specify the direction.

You can optionally OR in either or both of the following:

• URB_ISOCH_ASAP—allow transfer as soon as possible (overrides frame).
• URB_SHORT_XFER_OK—allow short transfers.

frame

The device frame number. This is ignored if URB_ISOCH_ASAP is set.

addr

The address for the start of the transfer. You must use the buffer allocated by usbd_alloc().

len

The length (in bytes) of the data transfer.

Library:

libusbdi

Description:

This routine sets up a URB for an isochronous transfer.

Returns:

EOK

Success.

Classification:

QNX Neutrino, QNX 4

See also:

usbd_descriptor(), usbd_feature(), usbd_io(), usbd_setup_bulk(), usbd_setup_control(), usbd_setup_interrupt(), usbd_setup_vendor(), usbd_status()