Hi Possum,

If you use external controller like arduino you could set all you need in register 17

Register 17 (0x11) (MC5)
|1| | | | | | | | Mono Right (if set for MONO)
|0| | | | | | | | Mono Left (if set for MONO) (D)
| |1| | | | | | | OSF (Oversample filter) Bypass
| |0| | | | | | | Use OSF (D)
| | |1| | | | | | Relock Jitter Reduction
| | |0| | | | | | Normal Operation Jitter Reduction (D)
| | | |1| | | | | SPDIF: Auto deemph ON (D)
| | | |0| | | | | SPDIF: Auto deemph OFF
| | | | |1| | | | SPDIF Auto (Only if no I2S on pins) (D)
| | | | |0| | | | SPDIF Manual (Manually select SPDIF input format)
| | | | | |1| | | FIR: 28 coefficients (D)
| | | | | |0| | | FIR: 27 coefficients
| | | | | | |1| | FIR: Phase invert
| | | | | | |0| | FIR: Phase NO invert (D)
| | | | | | | |1| All MONO (Then select Mono L or R)
| | | | | | | |0| Eight channel (D)

the default value in Hifiduino is:
0x9D which is 1001 1101

if you want to change chanell you put it to 0x1D which is 0001 1101

thats the code from Hifiduino
#ifdef DUALMONO
byte reg17R=0x9D; // Auto SPDIF, MONO RIGHT CHANNEL, other defaults. Used for reg 17 right only
#endif DUALMONO


void writeSabreReg(byte regAddr, byte regVal)
{
// By default the chip with addres 0x48 is the left channel
writeSabreLeftReg(regAddr, regVal);

#ifdef DUALMONO
// If dual mono write also to the other chip.
writeSabreRightReg(regAddr, regVal);
// Set the right chip (addr 0x49) to be the right channel
reg17R=reg17;
writeSabreRightReg(0x11, bitSet(reg17R,7));
#endif DUALMONO
}

writeSabreReg(0x11,reg17);

Now you just have to know the adress of your chip, which by default is 0x48, by changing the addr jumper (for details see Integration guide) you can change it to 0x49, but its not a must if you use just one buffalo, just write the settings to right chip.

Tomasz

The easiest way is to use the address jumper and the on-board firmware with the DIP switches set to Mono. No need to do anything with I2C unless you are already doing so for another reason.

2 Transmitters, 2 Receivers.