squeezelite-esp32/components/spotify/cspot/bell/main/audio-sinks/esp/AC101AudioSink.cpp

#include "AC101AudioSink.h"

#include "driver/i2s.h"

AC101AudioSink::AC101AudioSink() {
  // Disable software volume control, all handled by ::volumeChanged
  softwareVolumeControl = false;

  i2s_config_t i2s_config = {

      .mode = (i2s_mode_t)(I2S_MODE_MASTER | I2S_MODE_TX),  // Only TX
      .sample_rate = 44100,
      .bits_per_sample = (i2s_bits_per_sample_t)16,
      .channel_format = I2S_CHANNEL_FMT_RIGHT_LEFT,  //2-channels
      .communication_format = (i2s_comm_format_t)I2S_COMM_FORMAT_I2S,
      .intr_alloc_flags = 0,  //Default interrupt priority
      .dma_buf_count = 8,
      .dma_buf_len = 512,
      .use_apll = true,
      .tx_desc_auto_clear = true  //Auto clear tx descriptor on underflow
  };

  i2s_pin_config_t pin_config = {
      .bck_io_num = 27,
      .ws_io_num = 26,
      .data_out_num = 25,
      .data_in_num = -1  //Not used
  };

  dac = &dac_a1s;

  dac->init(0, 0, &i2s_config);
  dac->speaker(false);
  dac->power(ADAC_ON);

  startI2sFeed();
}

AC101AudioSink::~AC101AudioSink() {}

void AC101AudioSink::volumeChanged(uint16_t volume) {
  dac->volume(volume, volume);
}