#include "AudioTools.h"

// ESP32-S3 I2S pins
#define I2S_BCLK 1   // Bit Clock
#define I2S_LRC  2  // Left/Right Clock
#define I2S_DIN  43  // Data to MAX98357A

const int freqs[] = {220, 440, 660, 880};
const int amps[] = {4000, 8000, 16000, 32000};
int freqIndex = 0;
int ampIndex = 0;
unsigned long lastChange = 0;

const int sampleRate = 22000; // Hz

AudioInfo info(sampleRate, 1, 16);
SineWaveGenerator<int16_t> sineWave(32000);
GeneratedSoundStream<int16_t> sound(sineWave);
I2SStream out;
StreamCopy copier(out, sound);

void setup() {
  Serial.begin(115200);
  Serial.println("I2S Sine Wave Playback");

  AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Warning);

  // I2S pin configuration
  auto config = out.defaultConfig(TX_MODE);
  config.copyFrom(info);
  config.pin_bck = I2S_BCLK;
  config.pin_ws = I2S_LRC;
  config.pin_data = I2S_DIN;

  out.begin(config);

  sineWave.begin(info, freqs[0]);
  Serial.println("Started sine wave playback");
}

void loop() {
  if (millis() - lastChange >= 2000) {
    lastChange = millis();
    freqIndex = (freqIndex + 1) % 4;
    if (freqIndex == 0) ampIndex = (ampIndex + 1) % 4;

    sineWave.setFrequency(freqs[freqIndex]);
    sineWave.setAmplitude(amps[ampIndex]);
  }

  copier.copy();
}