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usbd setup isochronous()  2006, QNX Software Systems GmbH & Co. KG.

Set up a URB for an isochronous transfer

Synopsis:

CAUTION: 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.

88 Chapter 4 USB Library Reference November 2, 2006

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Belkin F8E211 Guía de usuario Pagina 100