UBTBCMFW_BULK_DT_WR
[UBTBCMFW_BULK_DT_WR] = {
usbd_transfer_start(sc->sc_xfer[UBTBCMFW_BULK_DT_WR]);
usbd_transfer_stop(sc->sc_xfer[UBTBCMFW_BULK_DT_WR]);
xfer = sc->sc_xfer[UBTBCMFW_BULK_DT_WR];