[ESP32]アンプ内蔵外部DAC(MAX98357A)とスピーカーで音楽再生 with Arduino IDE

#include <Audio.h>
#include <SPIFFS.h>

#define I2S_DOUT      25
#define I2S_BCLK      27
#define I2S_LRC       26

Audio audio;

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

  SPIFFS.begin();
  audio.setPinout(I2S_BCLK, I2S_LRC, I2S_DOUT);
  audio.forceMono(true);
  audio.setVolume(21); // default 0...21

  audio.connecttoFS(SPIFFS, "/kanpai.mp3");
}

void loop()
{
  audio.loop();
}

// optional
void audio_info(const char *info){
    Serial.print("info        "); Serial.println(info);
}
void audio_id3data(const char *info){  //id3 metadata
    Serial.print("id3data     ");Serial.println(info);
}
void audio_eof_mp3(const char *info){  //end of file
    Serial.print("eof_mp3     ");Serial.println(info);
}
void audio_showstation(const char *info){
    Serial.print("station     ");Serial.println(info);
}
void audio_showstreamtitle(const char *info){
    Serial.print("streamtitle ");Serial.println(info);
}
void audio_bitrate(const char *info){
    Serial.print("bitrate     ");Serial.println(info);
}
void audio_commercial(const char *info){  //duration in sec
    Serial.print("commercial  ");Serial.println(info);
}
void audio_icyurl(const char *info){  //homepage
    Serial.print("icyurl      ");Serial.println(info);
}
void audio_lasthost(const char *info){  //stream URL played
    Serial.print("lasthost    ");Serial.println(info);
}
void audio_eof_speech(const char *info){
    Serial.print("eof_speech  ");Serial.println(info);
}

#include <Audio.h>
#include <SPIFFS.h>

#define I2S_DOUT      25
#define I2S_BCLK      27
#define I2S_LRC       26

  audio.setPinout(I2S_BCLK, I2S_LRC, I2S_DOUT);
  audio.forceMono(true);
  audio.setVolume(21); // default 0...21

  audio.connecttoFS(SPIFFS, "/kanpai.mp3");

  audio.loop();