External ADC + external DAC on esp32

[gurinkirill]

I have next scheme: mic -> DAC (PCM5102A) -> esp32 -> ADC (PCM1808) -> speaker. I configure these like:

#include "Arduino.h"
#include "AudioTools.h"

I2SStream in;
I2SStream out;
StreamCopy copier(out, in);

void setup() {

    Serial.begin(115200);
    AudioLogger::instance().begin(Serial, AudioLogger::Info);

    // ADC
    auto configAdc = in.defaultConfig(RX_MODE);
    configAdc.port_no = 0;
    configAdc.pin_bck = 33;
    configAdc.pin_ws = 32;
    configAdc.pin_data = 25;
    configAdc.i2s_format = I2S_STD_FORMAT;
    configAdc.bits_per_sample = 32;
    configAdc.channels = 2;
    configAdc.sample_rate = 44100;
    configAdc.is_master = true; // optional because default setting
    configAdc.use_apll = false;
    configAdc.pin_mck = 3;
    in.begin(configAdc);

    // DAC
    auto configDac = out.defaultConfig(TX_MODE);
    configDac.port_no = 1;
    configDac.pin_bck = 14;
    configDac.pin_ws = 26;
    configDac.pin_data = 27;
    configDac.i2s_format = I2S_STD_FORMAT;
    configDac.bits_per_sample = 32;
    configDac.channels = 2;
    configDac.sample_rate = 44100;
    configDac.is_master = true;
    configDac.use_apll = false;
    configDac.pin_mck = 3;
    out.begin(configDac);
}

void loop() {
    copier.copy(); 
}

After uploading there is only noise in speakers. What can be the problem?

The DAC works well with internal esp32's ADC, but after connecting external one I'm facing that problem. So, I think that the problem may be related to incorrect ADC setting. I tried to change ADC's .is_master to false, nothing happens.

Connection scheme:

[pschatzmann]

Just look at the provided examples: There is a one port soluton where you can share the pins and a two port solution where you would need to specify the port:

• streams-i2s-i2s-2
• streams-i2s-i2s

[AlexSWapk]

Hello @gurinkirill,
Did you manage to get your project working? Because I have a similar project and I don't get any sound coming out of the PCM5102 (which works fine on its own) - I think it's the PCM1808 that's causing the problem...
Many thanks in advance !

[gurinkirill]

Hi! Yes, I did. Here is the project repo. And this is the configuration of DAC and ADC, I used.