AD1848_STATUS
status = ADREAD(&sc->sc_ad1848, AD1848_STATUS);
ADWRITE(&sc->sc_ad1848, AD1848_STATUS, 0);
ADWRITE(sc, AD1848_STATUS, 0);
printf("ad1848 status=%02x", ADREAD(sc, AD1848_STATUS));
status = ADREAD(sc, AD1848_STATUS);
ADWRITE(sc, AD1848_STATUS, 0);
status = ADREAD(&sc->sc_ad1848, AD1848_STATUS);
ADWRITE(&sc->sc_ad1848, AD1848_STATUS, 0);