AUVITEK_BULK_BUFLEN
sc->sc_ab.ab_endpt, AUVITEK_BULK_BUFLEN);
AUVITEK_BULK_BUFLEN, 0, 0, &sc->sc_ab.ab_bx[i].bx_xfer);
usbd_setup_xfer(bx->bx_xfer, bx, bx->bx_buffer, AUVITEK_BULK_BUFLEN,