i2s_config_t i2s_config = {
      .mode = I2S_MODE_MASTER | I2S_MODE_TX, 
      .sample_rate = SAMPLE_RATE,
      .bits_per_sample = 16, 
      .channel_format = I2S_CHANNEL_FMT_RIGHT_LEFT,         
      .communication_format = I2S_COMM_FORMAT_I2S,
      .intr_alloc_flags = ESP_INTR_FLAG_LEVEL1, 
      .dma_buf_count = 2,
      .dma_buf_len = sizeof(arr),
      .use_apll = false };

  i2s_pin_config_t pin_config = { 
    .bck_io_num = I2S_BCK_IO, 
    .ws_io_num = I2S_WS_IO, 
    .data_out_num = I2S_DO_IO, 
    .data_in_num = I2S_DI_IO //Not used
      };

  i2s_driver_install(I2S_NUM, &i2s_config, 0, NULL);
  i2s_set_pin(I2S_NUM, &pin_config);
  i2s_set_clk(I2S_NUM, SAMPLE_RATE, 16, I2S_CHANNEL_STEREO);
  i2s_zero_dma_buffer(I2S_NUM);
  esp_intr_alloc(ETS_I2S1_INTR_SOURCE, i2s_config.intr_alloc_flags,
      &i2s_isr,
      NULL, &i2s_interrupt);
  esp_intr_enable(i2s_interrupt);