Surround Audio over SPDIF, HDMI and I2S

mbt28 · Posted at 3/11/2015 20:52:53

Hello,

Is it possible to have 4ch or more output from firefly? As far as I see from RK3288 datasheet it is possible through I2S but SPDIF just has has two channels. And what about HDMI, I couldnt see any information, as far as I know HDMI uses same output like SPDIF so it has to be 2 channels as well.

Could you please clarify these?

Thank you.

FesterBester38 · Posted at 4/12/2015 20:27:11

Hello,

The RK3288 can provide up to 4 I2S outputs. If you look at page 12 of the Firefly board schematics you can see that only I2S_SDO0 is connected to the processor pins. So having 4 channels or more would require these channels to be interleaved on a single output stream. I don't know if this is possible, or even if it is implemented within the audio driver. I've just began to study the i2s/pcm manual chapter and the way it works is not yet clear in my mind.

Maybe Linux rock chip specialists could answer that?

Thx

Birender · Posted at 2/27/2017 04:42:51

Is same possible with RK3128 (8channel I2S)?