Add Toslink to PI+Allo Boss Dac

[sourceror]

Hi all,

I have an Allo Boss DAC connected to my PI and it's working great.

I want to add a Toslink input to my project. With a DIR9001 I can convert a Toslink TORX179 input into an I2s signal.

Now I have the following options:

1. Connect this to the I2S bus. According to the I2S standard you can have multiple devices on the same bus. Now we have to a] either first read it into the PI and output it back to the BOSS or b] let the BOSS directly handle the I2s signal since it's a bus master.
2. Implement a I2S switch. Switching between PI and Toslink I2S signals.

What option would you choose? 1a/1b or 2 and why?

Let me know.

 

[sourceror]

Never mind. Option 1a and 1b won’t work.

I2s is a bus but only between a master and a slave and optionally a controller. Can’t have two senders on the bus. Multiple receivers is possible as long as they are slaves.

So I go for the switch. Option 2.

Thanks.

 

[Mark Tillotson]

Only the clocks in I2S are bussed, the data is individual to each stereo device, and the data direction depends on whether its an ADC or a DAC.

 

[sourceror]

Okay, I choose the switch route.

Now a new problem. I thought just adding a switch/multiplexer between RPI and DIR9001 would do the trick, but no. Both the Allo Boss and a DIR9001 want to be master.

Again two options:

1. I can configure the Allo Boss to become a slave through software and switch over to the DIR9001.
2. I somehow make two masters work...

What to do?