I2S Fix Builtin DAC&PDM on ESP32 & compiling warning ESP32-C3

[FedericoBusero]

The PR to make the library compatible with ESP32C3 was not fully correct: Builtin DAC&PDM functionality was lost on ESP32. This should fix it again.

Also some compiling warnings are removed about I2S_COMM_FORMAT_STAND_MSB being deprecated, when compiling in the ESP32 Arduino core v2 (IDF>=4.2)

#442

[FedericoBusero]

To test the library in Arduino ESP32 core version 2:

• on ESP32-C3, use Arduino ESP32 core version 2.0.1 and don't use pin 4.
• on ESP32 you need to use Arduino ESP32 core version 2.0.0rc2.

A test program for ESP32-C3 that should work:

#include "AudioFileSourcePROGMEM.h"
#include "AudioGeneratorRTTTL.h"
#include "AudioOutputI2S.h"

#define I2S_SPEAKER_SERIAL_CLOCK GPIO_NUM_6 // BCLK
#define I2S_SPEAKER_LEFT_RIGHT_CLOCK GPIO_NUM_7 // WSEL,LRC 
#define I2S_SPEAKER_SERIAL_DATA GPIO_NUM_10 // DIN

const char rudolph[] PROGMEM = 
"Rudolph the Red Nosed Raindeer:d=8,o=5,b=250:g,4a,g,4e,4c6,4a,2g.,g,a,g,a,4g,4c6,2b.,4p,f,4g,f,4d,4b,4a,2g.,g,a,g,a,4g,4a,2e.,4p,g,4a,a,4e,4c6,4a,2g.,g,a,g,a,4g,4c6,2b.,4p,f,4g,f,4d,4b,4a,2g.,g,a,g,a,4g,4d6,2c.6,4p,4a,4a,4c6,4a,4g,4e,2g,4d,4e,4g,4a,4b,4b,2b,4c6,4c6,4b,4a,4g,4f,2d,g,4a,g,4e,4c6,4a,2g.,g,a,g,a,4g,4c6,2b.,4p,f,4g,f,4d,4b,4a,2g.,4g,4a,4g,4a,2g,2d6,1c.6.";

AudioGeneratorRTTTL *rtttl;
AudioFileSourcePROGMEM *file;
AudioOutputI2S *out;

void setup()
{
  Serial.begin(115200);
  delay(1000);

  Serial.printf("RTTTL start\n");

  audioLogger = &Serial;
  file = new AudioFileSourcePROGMEM( rudolph, strlen_P(rudolph) );
  out = new AudioOutputI2S();
  out -> SetPinout(I2S_SPEAKER_SERIAL_CLOCK,I2S_SPEAKER_LEFT_RIGHT_CLOCK,I2S_SPEAKER_SERIAL_DATA);
  rtttl = new AudioGeneratorRTTTL();
  rtttl->begin(file, out);
}

void loop()
{
  if (rtttl->isRunning()) {
    if (!rtttl->loop()) rtttl->stop();
  } else {
    Serial.printf("RTTTL done\n");
    delay(1000);
  }
}

[FedericoBusero]

The cool thing is that also the NoDac output works out-of-the-box on ESP-C3! So you can get audio out of the ESP32C3 without internal/external DAC using this lib.

[goberhammer]

Thanks a lot for this patch! I was pulling my hairs out with a new M5StickC Plus to get internal DAC to work!
Now at least I have some output, albeit with a lot of noise, but that is another problem.
Thanks again!

[sh-user]

At the first compilation in Arduino IDE 1.8.13 on Windows, warning messages I2S_COMM_FORMAT_STAND_MSB appear, but at the second compilation everything is fine, there are no messages.