I2S Output of 4 Channels with an ESP32

[bbaldach]

Hi , I’ve try to implement the "I2S Output of 4 Channels with an ESP32" with 2 DAC (PCM5102A) and an ESP32 DEVKIT V1.
The first DAC is connected to
config1.pin_bck = 25;
config1.pin_ws = 33;
config1.pin_data = 32
and the second one to
config2.pin_bck = 14;
config2.pin_ws = 15;
config2.pin_data = 22;

but I only have sound (with a lot of glitch on DAC1)

In the terminal I have that “error” : [W] AudioOutput.h : 843 – Could not write all samples

Do you have an idea ?

thank you

#include <SPI.h>
#include <SD.h>
#include "AudioTools.h"
#include "AudioCodecs/CodecMP3Helix.h"

const int chipSelect=10;
AudioInfo info(44100, 2, 16);
I2SStream i2s_1; // final output
I2SStream i2s_2; // final out
ChannelsSelectOutput out;
WAVDecoder wav;
EncodedAudioOutput decoder(&out, &wav); // Decoding stream
StreamCopy copier; 
File audioFile;

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

  // setup file
  SD.begin(chipSelect);
  audioFile = SD.open("/4.wav");

  // setup i2s
  auto config1 = i2s_1.defaultConfig(TX_MODE);
  config1.copyFrom(info);
  config1.port_no = 0;
  config1.pin_bck = 25;// config1.pin_bck = 14;
  config1.pin_ws = 33;// config1.pin_ws = 15;
  config1.pin_data = 32;// config1.pin_data = 22;  
  config1.set(info);
  i2s_1.begin(config1);
  
  auto config2 = i2s_2.defaultConfig(TX_MODE);
  config2.copyFrom(info);
  config2.port_no = 1;
  config2.pin_bck = 14;//config2.pin_bck = 25;
  config2.pin_ws = 15;//config2.pin_ws = 33;
  config2.pin_data = 22;//config2.pin_data = 32;
  i2s_2.begin(config2);

  // split channels to different i2s ports
  out.addOutput(i2s_1, 0, 1);
  out.addOutput(i2s_2, 2, 3);
  out.addNotifyAudioChange(i2s_1);
  out.addNotifyAudioChange(i2s_2);
  out.begin(info);

  // setup decoder
  decoder.begin();

  // begin copy
  copier.begin(decoder, audioFile);
}

void loop(){
  if (!copier.copy()) {
    stop();
  }
}

[pschatzmann]

There have been a couple of improvements & corrections.
Try again with the latest version...

ps. does your input data really have 4 channels ? if it is a regular stereo file you could do
out.addOutput(i2s_1, 0, 1);
out.addOutput(i2s_2, 0, 1);
or
out.addOutput(i2s_1, 0, 0); // only left on 1
out.addOutput(i2s_2, 1, 1); // only right on 2

There should be no need for calling addNotifyAudioChange any more

[bbaldach]

Ok . I think I have the latest version but I'll double check.

It's a 4 channels Wave file

[bbaldach]

😔 DIN and LCK was inverted on my board ......
It works now.
Only glitch on both DAC but I think it's due to SD card speed.
Thanks a lot !!

[bbaldach]

I have not yet found the solution to Glitch ... and my wave file looks played half speed.
How the libray manage 16 bits I2S stream to 32 bits I2S DAC ? (PCM5102A)

[pschatzmann]

There is a chapter in the Wiki for format conversion!

[bbaldach]

Hi @pschatzmann ,

I've made several test with SPI SD, SDMMC 1 bit and 4 bit, chnage of SD Card, etc... and I don't found why my file continu to be played "slowly" and with some glitch.

this is my code (very close to your example. Any idea ?
And this is the wav file used (rename as txt because wav are not allowed)
4.txt

`#include <FS.h>
#include <SD_MMC.h>
#include <AudioTools.h>
#include <AudioCodecs/CodecWAV.h>

int clk = 36;
int cmd = 35;
int d0 = 37;
int d1 = 20;
int d2 = 41;
int d3 = 42;

AudioInfo info(44100, 2, 16);
I2SStream i2s_1; // final output port 0
I2SStream i2s_2; // final output port 1
ChannelsSelectOutput out;
WAVDecoder wav;
EncodedAudioOutput decoder(&out, &wav); // Decoding stream
StreamCopy copier;
File audioFile;

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

// setup i2s
auto config1 = i2s_1.defaultConfig(TX_MODE);
config1.copyFrom(info);
config1.port_no = 0;
config1.pin_bck = 40;
config1.pin_ws = 38;
config1.pin_data = 39;
i2s_1.begin(config1);
auto config2 = i2s_2.defaultConfig(TX_MODE);
config2.copyFrom(info);
config2.port_no = 1;
config2.pin_bck = 45;
config2.pin_ws = 21;
config2.pin_data = 47;
i2s_2.begin(config2);

if(! SD_MMC.setPins(clk, cmd, d0,d1,d2,d3)){
     Serial.println("Pin change failed!");
    return;
}

// open sdmmc in 4 bit mode

if (!SD_MMC.begin("/sdcard",false,false,40000,5)){
Serial.println("SD_MMC Error");
stop();
}
// open file
audioFile = SD_MMC.open("/4.wav");
if (!audioFile){
Serial.println("File does not exist");
stop();
}

// split channels to different i2s ports
out.addOutput(i2s_1, 0, 1);
out.addOutput(i2s_2, 2, 3);
//out.addNotifyAudioChange(i2s_1);
//out.addNotifyAudioChange(i2s_2);
out.begin(info);

// setup decoder
decoder.begin();

// begin copy
copier.begin(decoder, audioFile);
}

void loop(){
if (!copier.copy()) {
stop();
}
}`

[pschatzmann]

Did you already try out this optimization ?

[bbaldach]

Yes, I've try but no result till I comment :
//AudioLogger::instance().begin(Serial, AudioLogger::Info);
Now it works properly

[bbaldach]

Looks like AudioLogger consume too much ressources of the ESP32-S3

[pschatzmann]

What makes you thinks so ?
Did you use the recommended Warning level ?

[bbaldach]

What makes you thinks so ? Did you use the recommended Warning level ?

Because when I comments the audiologger line sound reproduction is correct.
I have used the example who define an "Info" Level. I have to test with "Warning" level to seen if it works correctly.

[pschatzmann]

Commenting it out is the same as setting it to Warning...