usbd_io()

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.

Returns:

EBADF

Improper usbd_connect() call.

EINVAL

Improper usbd_connect() call.

ENODEV

Device was removed.

Classification:

QNX Neutrino, QNX 4

See also:

usbd_descriptor(), usbd_feature(), usbd_setup_control(), usbd_setup_bulk(), usbd_setup_interrupt(), usbd_setup_isochronous(), usbd_setup_vendor(), usbd_status()