USSCANNER_TIMEOUT
sizeof(sense_cmd), 0, USSCANNER_TIMEOUT,
USBD_SHORT_XFER_OK, USSCANNER_TIMEOUT, usscanner_intr_cb);
USSCANNER_TIMEOUT, usscanner_sensedata_cb);
xs->cmdlen, 0, USSCANNER_TIMEOUT, usscanner_cmd_cb);