Belkin F8E211 Uživatelská příručka stáhnout pdf (Strana 86)

usbd

setup

Set up a URB for a control transfer

This function isn’t currently implemented. To set up a URB for a control transfer, use

usbd

setup

vendor() instead.

Synopsis:

#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 );

Arguments:

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 the direction.

You can optionally OR in the following:

•

URB_SHORT_XFER_OK—allow short transfers.

request A device-speciﬁc request.

rtype The type of request; one of the following:

•

USB_RECIPIENT_DEVICE

• USB_RECIPIENT_INTERFACE

• USB_RECIPIENT_ENDPOINT

• USB_RECIPIENT_OTHER

ORed with one of the following:

•

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.

72 Chapter 4 • USB Library Reference September 10, 2007

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