Belkin F8E211 Guía de usuario descargar pdf (Pagina 96)

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

Set up a URB for a control transfer

Synopsis:

CAUTION: This function is still under development its synopsis

and other details shown here may change signiﬁcantly!

#include <sys/usbdi.h>

usbd

setup control( struct usbd urb *urb, uint32 ﬂags, uint16

request,

uint16 rtype, uint16 value, uint16 index, void *addr,

uint32 len );

Description:

This routine sets up a URB for a control 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 SHORT XFER OK—Allow short transfers.

request A device-speciﬁc request.

rtype Type of request (e.g.

USB RECIPIENT DEVICE,

USB RECIPIENT INTERFACE,

USB RECIPIENT ENDPOINT, USB RECIPIENT OTHER,

USB TYPE STANDARD, USB TYPE CLASS,

USB TYPE VENDOR).

value This varies, depending on the request. It’s used for

passing a parameter to the device.

index This varies, depending on the request. It’s used for

passing a parameter to the device.

84 Chapter 4 USB Library Reference November 2, 2006

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Belkin F8E211 Guía de usuario Pagina 96