DAC_READ
bits = DAC_READ(sc, FFB_DAC_VALUE);
if (!(DAC_READ(sc, FFB_DAC_VALUE) & FFB_DAC_TGC_TIMING_ENABLE))
if (!DAC_READ(sc, FFB_DAC_VALUE)) {
dac = DAC_READ(sc, FFB_DAC_VALUE);
printf("tgc: %08x\n", DAC_READ(sc, FFB_DAC_VALUE));
printf("dcl: %08x\n", DAC_READ(sc, FFB_DAC_VALUE));
dac = DAC_READ(sc, FFB_DAC_VALUE);
val = DAC_READ(sc, FFB_DAC_VALUE);