usbd_get_endpoint_descriptor
ed = usbd_get_endpoint_descriptor(usc->usc_iface, AR_PIPE_RX_INTR);
ed = usbd_get_endpoint_descriptor(sc->sc_iface, AR_EPT_INTR_RX_NO);
edesc = usbd_get_endpoint_descriptor(sc->sc_iface, 0x83);
epd = usbd_get_endpoint_descriptor(sc->sc_iface, ep->addr);
usbd_get_endpoint_descriptor(struct usbd_interface *, uint8_t);