Hi Pepijn, > Thanks for the advice so far. > Based on this post, I managed to make my own I2S overlay. > https://www.raspberrypi.org/forums/viewtopic.php?t=189152 > > However, still only two channels. > I found that the Pi can in fact understand TDM, but the SoC can only get 2 > of the channels for some reason. > https://github.com/raspberrypi/linux/pull/1982 Yep, two channels only for Pi. It's after all a consumer SoC designed for mobile phones. I am not sure how the Audioinjector Octo works but this has eight channels. It uses a gate array with some kind of strange multiplexing. I have added Matt, he will be able to explain more on the design ;-). > For the Beagle Bone, I also found someone who makes a cape with a lot of > inputs and outputs. > There are some forum post scattered here and there with references to McASP, > as you mentioned. > This overlay seems a good starting point, potentially: > https://github.com/ctag-fh-kiel/ctag-face-2-4/blob/master/device-tree-overlays/BB-CTAG-SW-8CH-00A0.dts > > So to sum it up, I2S works on the Pi for 2 channels, Beagle Bone is > something to look at more closely. We are working with a university who have designed a Beaglebone cape and I have written kernel driver for soundcard with up to 6 input/output channels designed for hearing aid research. Please wait kindly and I will post a link to the Github page in coming days with full hardware layout and kernel patch. BR, Chris _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx https://lists.linuxaudio.org/listinfo/linux-audio-user
