AD1848_STATUS
ADWRITE(sc, AD1848_STATUS, 0);
status = ADREAD(sc, AD1848_STATUS);
ADWRITE(sc, AD1848_STATUS, 0);
printf("ad1848 status=%02x", ADREAD(sc, AD1848_STATUS));
status = CS_READ(sc, AD1848_STATUS);
CS_WRITE(sc, AD1848_STATUS, 0);