Belkin F8E211 Guia do Utilizador descarregar pdf (Página 68)

usbd

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 );

Arguments:

urb A pointer to a USB Request Block.

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.

Library:

libusbdi

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 DDK, 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.

54 Chapter 4 • USB Library Reference September 10, 2007

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