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usbd_setup_isochronous()

Set up a URB for an isochronous transfer

Synopsis:

This function is still under development - its synopsis and other details shown here may change significantly!

#include <sys/usbdi.h>

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

Description:

This routine sets up a URB for an isochronous transfer.

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 direction.
• 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

Address for start of transfer -- you must use the buffer allocated by usbd_alloc().

len

The length (in bytes) of the data 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()