UGENSA_BULK_DT_RD
[UGENSA_BULK_DT_RD] = {
xfer_config[UGENSA_BULK_DT_RD].ep_index = x;
usbd_xfer_set_stall(ssc->sc_xfer[UGENSA_BULK_DT_RD]);
usbd_transfer_start(ssc->sc_xfer[UGENSA_BULK_DT_RD]);
usbd_transfer_stop(ssc->sc_xfer[UGENSA_BULK_DT_RD]);