usbd_xfer_set_interval
usbd_xfer_set_interval(xfer, 0);
usbd_xfer_set_interval(xfer, x);
usbd_xfer_set_interval(sc->sc_xfer[ATP_INTR_DT], 1000 / rate);
usbd_xfer_set_interval(sc->xfer[UEP_INTR_DT], 1000 / rate);
usbd_xfer_set_interval(transfer, 500);
usbd_xfer_set_interval(transfer, 0);
usbd_xfer_set_interval(transfer, 0);
usbd_xfer_set_interval(sc->sc_xfer[UKBD_INTR_DT_0], rate);
usbd_xfer_set_interval(sc->sc_xfer[UKBD_INTR_DT_1], rate);
usbd_xfer_set_interval(sc->sc_xfer[UMS_INTR_DT], 1000 / rate);
usbd_xfer_set_interval(sc->sc_xfer[WSP_INTR_DT], 1000 / rate);
usbd_xfer_set_interval(xfer, cdce_tx_interval);
usbd_xfer_set_interval(xfer, 500);
usbd_xfer_set_interval(xfer, 0);
usbd_xfer_set_interval(xfer, 0);
usbd_xfer_set_interval(xfer, 0);
usbd_xfer_set_interval(xfer, 500); /* ms */
usbd_xfer_set_interval(xfer, 0);
usbd_xfer_set_interval(xfer, 0);
usbd_xfer_set_interval(sc->sc_xfer[x], iv);
void usbd_xfer_set_interval(struct usb_xfer *xfer, int);