Belkin F8E211 Guía de usuario descargar pdf (Pagina 76)

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

Submit a previously set up URB to the USB stack

Synopsis:

#include <sys/usbdi.h>

int usbd

io( struct usbd urb *urb,

struct usbd

pipe *pipe,

void (*func)(struct usbd

urb *,

struct usbd

pipe *, void *),

void *handle,

uint32 timeout );

Description:

This routine submits a previously set up URB to the USB stack. The

URB would have been set up from one of these functions:

usbd setup bulk()

usbd setup control()

usbd setup interrupt()

usbd setup isochronous()

usbd setup vendor()

For this release of the USB SDK, vendor requests are synchronous

only. Therefore, the func parameter in usbd

io() must be NULL.

☞

The usbd io() function is the one that actually makes the data transfer

happen; the setup functions simply set up the URB for the data

transfer.

pipe An opaque handle returned by usbd

open pipe().

func Callback at I/O completion, given URB, pipe, plus

handle.

handle User data.

timeout A value (in milliseconds) or

USBD TIME DEFAULT or

USBD TIME INFINITY.

64 Chapter 4 USB Library Reference November 2, 2006

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Belkin F8E211 Guía de usuario Pagina 76