XMOS USB - I2S Adapter

[R101]

I am new to all this and have just set up a B+ with v0.3-beta.

It all works well until I connect my USB DAC, which uses an XMOS based USB to I2S adapter. Rune just keeps reporting that the sound card configuration has changed and cycles the volume between 0 and 100, but does nothing else. The adapter works OK under Ubuntu. Is the Rune kernel UAC2 compliant, or am I wasting my time?

An alternative would be to use the Pi's I2S output in slave mode. Are there any instructions on how to do this in Rune?

[hondagx35]

[R101]

Thanks for the reply, hondagx35.

The USB adapter is locally powered, so I don't think it's likely to be a power problem. It is showing that kind of behaviour, though, so I will check.

None of the I2S choices are labelled as slave mode, but perhaps one is?. So far as I know, the kernel still has to be recompiled to alter the clock direction, which is not something I could do without a lot of help.

[hondagx35]

Hi R101,

the latest image for RP2 and RP3 have support for the HiFiBerry Digi (all versions) and the DAC+ Pro.
These two DACs make use of the slave mode (DAC is clock master).
So check their driver source code how this is done.

Which Pi do you use?

Frank

[R101]

Hi hondagx35,

I am using a B+ but as a result of your post I will be ordering a Pi3 right now!

Thanks.

[R101]

To update this, the Pi 3 works perfectly with my USB card.