[AudioI] HDMI+octo and also ... Re: OCTO inputs and output configuration

[Matt]

Great !

Regarding DC output/input, I think you should do some experimenting 
directly on the main sound card board. Be very careful not to send 
static electricity into the pins.

In this repo, you can see the io pin mapping for the main sound card :

https://github.com/Audio-Injector/AudioInjector.Octo.template

https://github.com/Audio-Injector/AudioInjector.Octo.template/blob/master/AudioInjector.Octo.sch.pdf

If you start with probing the pins for how it outputs DC voltages, that 
may help you.


Regarding getting more outputs, the I2S bus is limited to 8 channels 
with this card. We are considering doing a 12/16 channel version.

We have an early post from this email list which demonstrates how to 
configure the HDMI audio and a GPIO sound card at the same time. This 
allows you to use both cards. You will have to create a .asoundrc file 
to merge the two cards into one, which will give you 16 outputs, however 
I am not sure about synchrony - it will require experimentation !

https://lists.audioinjector.net/pipermail/people/2020-March/000021.html

thanks

Matt


On 20/5/20 9:22 pm, Alberto Novello wrote:
> Hi Matt, I'm very happy with the Octo thanks so much. It' perfect for 
> what I'm doing.
> I tried shorting the caps but it did not seem to change much. I'll 
> work later of making it DC maybe those resistors will make the magic.
>
> I have another question, supposing I would like to have more outs 
> could I use coupe of inputs for those?
> Or in case is it still possible to use the default soundcard from the Pi?
>
> Thanks a lot!
> A
>
>
>
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