UMASS_BBB_CBW_SIZE
&sc->cbw, UMASS_BBB_CBW_SIZE, 0,
bufp = usbd_alloc_buffer(xfer, UMASS_BBB_CBW_SIZE);
n = UMASS_BBB_CBW_SIZE;
memcpy(bufp, &cbw, UMASS_BBB_CBW_SIZE);