I2S with callback stream

[fobi55]

Hello,
I have little problem using I2S from codec (Pmod I2S2) with CallbackStream.

I2SStream codec_in_out;
CallbackStream cb(codec_in_out, IQIF); // It has output
StreamCopy copier(cb, codec_in_out);

Should I define separated streams for in/out and how to assign the pins?
With NodeMCU-32S I am using the next pins:

auto config = codec_in_out.defaultConfig(RXTX_MODE);
config.sample_rate = sample_rate;
config.bits_per_sample = 16;
config.i2s_format = I2S_STD_FORMAT;
config.is_master = true;
config.port_no = 0;
config.pin_ws = 18;
config.pin_bck = 5;
config.pin_data = 19;
//config.pin_data_rx = 17;
config.pin_data_rx = 21;
//config.pin_mck = 0;
//config.pin_mck = 4; // blocking com port
config.pin_mck = 3; // It works !!!!
//config.use_apll = true;
config.use_apll = false;

[pschatzmann]

In your example you define I2S as in douplex mode: so you can read and write to it!
In your logic however you only read from it: the writing part is missing!

There is an example whre I just copy the data from i2s to i2s!