MUE_ENDPT_TX
usbd_clear_endpoint_stall_async(sc->mue_ep[MUE_ENDPT_TX]);
if (sc->mue_ep[MUE_ENDPT_TX] != NULL) {
err = usbd_close_pipe(sc->mue_ep[MUE_ENDPT_TX]);
sc->mue_ep[MUE_ENDPT_TX] = NULL;
sc->mue_ed[MUE_ENDPT_TX] = ed->bEndpointAddress;
if (sc->mue_ep[MUE_ENDPT_TX] != NULL)
usbd_abort_pipe(sc->mue_ep[MUE_ENDPT_TX]);
err = usbd_open_pipe(sc->mue_iface, sc->mue_ed[MUE_ENDPT_TX],
USBD_EXCLUSIVE_USE, &sc->mue_ep[MUE_ENDPT_TX]);
usbd_setup_xfer(c->mue_xfer, sc->mue_ep[MUE_ENDPT_TX],