Name

usb_fill_int_urb — macro to help initialize a interrupt urb

Synopsis

void usb_fill_int_urb (struct urb *  urb,
 struct usb_device *  dev,
 unsigned int  pipe,
 void *  transfer_buffer,
 int  buffer_length,
 usb_complete_t  complete_fn,
 void *  context,
 int  interval);

Arguments

urb

pointer to the urb to initialize.

dev

pointer to the struct usb_device for this urb.

pipe

the endpoint pipe

transfer_buffer

pointer to the transfer buffer

buffer_length

length of the transfer buffer

complete_fn

pointer to the usb_complete_t function

context

what to set the urb context to.

interval

what to set the urb interval to, encoded like the endpoint descriptor's bInterval value.

Description

Initializes a interrupt urb with the proper information needed to submit it to a device. Note that high speed interrupt endpoints use a logarithmic encoding of the endpoint interval, and express polling intervals in microframes (eight per millisecond) rather than in frames (one per millisecond).