Cirrus Logic card as SPDIF DAC

Question

Hello, Can the Cirrus Logic audio card take an SPDIF input from an external source and play it on the analogue outputs? If so, is there likely to be much latency? Does the audio data have to pass through the Raspberry Pi or can this be handled by the card's hardware? Thanks,

timg73 · Accepted Answer

I'll answer my own question: yes, it can. The mixing is handled in hardware, and the latency is about 300us. BTW if anybody from Cirrus Logic is listening, a bit more documentation would be appreciated. There's a lot going on in this little audio chip and there are literally hundreds of registers and mixers accessible through the Linux driver. Parts can be figured out by reading the WM5102 datasheet, but the names don't always correspond.