Recording in mono

[coulisse]

Hello
is it possible with arduino-audiokit to record in mono mode?

I see that in config there is not the possiblity to specify the number of channels; there is only the fmt property that could be valued with:
I2S_CHANNEL_FMT_RIGHT_LEFT, I2S_CHANNEL_FMT_ALL_RIGHT, I2S_CHANNEL_FMT_ALL_LEFT,
I2S_CHANNEL_FMT_ONLY_RIGHT, I2S_CHANNEL_FMT_ONLY_LEFT.

Thanks in advance.
Corrado.

[pschatzmann]

It is unclear to me what you try to do, but I would expect that cfg.channels = 1; might be what you are looking for...

[coulisse]

Thanks for your always quick replay!
I would receive in mono instead of stereo from i2s.

If i referr to you example:
https://github.com/pschatzmann/arduino-audiokit/blob/main/examples/input/input.ino
is not possible to specify cfg.channesl=1

I got the following error:

error: 'struct AudioKitConfig' has no member named 'channels'

Thanks
Corrado

[coulisse]

In addition to previous question, i tell you that I made a trick and now it is running in mono! :-)
But I think this is not the proper way...

After begin i call i2s_set_clk:

kit.begin(cfg);
i2s_set_clk(I2S_NUM_0,11025,I2S_BITS_PER_SAMPLE_16BIT,I2S_CHANNEL_MONO); 

Best regards
Corrado

[pschatzmann]

I recommend to use the functionality from the arduino-audio-tools. It should work from there ...

I am not sure what exectly the impact of i2s_set_clk() is which is impacting only the ESP32 I2S side, but the sound chip is still producing and consuming stereo data.