ATU_ENDPT_TX
sc->atu_ed[ATU_ENDPT_TX] = ed->bEndpointAddress;
int err = usbd_create_xfer(sc->atu_ep[ATU_ENDPT_TX],
sc->atu_ep[ATU_ENDPT_TX]);
err = usbd_open_pipe(sc->atu_iface, sc->atu_ed[ATU_ENDPT_TX],
USBD_EXCLUSIVE_USE, &sc->atu_ep[ATU_ENDPT_TX]);
if (sc->atu_ep[ATU_ENDPT_TX] != NULL) {
usbd_abort_pipe(sc->atu_ep[ATU_ENDPT_TX]);
if (sc->atu_ep[ATU_ENDPT_TX] != NULL) {
usbd_close_pipe(sc->atu_ep[ATU_ENDPT_TX]);
sc->atu_ep[ATU_ENDPT_TX] = NULL;