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by vadim
Sun Sep 22, 2013 8:19 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: STICKY: The I2S sound thread. [I2S works]
Replies: 1001
Views: 584032

Re: I2S: Anyone got it running? (answer is yes!)

Hi All, I connected a mbed tlv320aic23b to my Raspberry. It works well when playing/streaming music with mplayer. But I have still some trouble with it. Using aplay I get an error (aplay: main:682: audio open error: No such file or directory) and I can't record anything. I connected DOUT to PCM_DIN...
by vadim
Sun Sep 22, 2013 7:40 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Multiple I2S input
Replies: 29
Views: 28947

Re: Multiple I2S input

I've managed to write a driver and use WM ADC. It actually required to edit bcm2708-i2s driver. Looks like this ADC can happily receive MCLK from RPi's general purpose clock driven by PLLD. Haven't tested 24/96 yet as for my application I need just 16/32. When your Pi's and ADC are due to arrive? Le...
by vadim
Wed Sep 18, 2013 8:39 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Multiple I2S input
Replies: 29
Views: 28947

Re: Multiple I2S input

I don't think that is feasible without hardware FIFO that would take care of reading and temporarily storing input values. Because I want multiple inputs, I have to bit-bang. External clock would be nice. So the following DMA code (inspired by P***) comes to my mind: * copy GPIO into RAM location * ...
by vadim
Wed Sep 18, 2013 2:23 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Multiple I2S input
Replies: 29
Views: 28947

Re: Multiple I2S input

I have a less ambitious objective: just one ADC (WM8783 which is very much like WM8782) and this already is not easy. I don't believe you will be ever able to make a userspace process that will do anything monotonically with frequency of more than 500Hz. I don't understand what is that you want to r...

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