AcidBox/i2s_setup.ino at main · streetuff/AcidBox · GitHub

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#ifdef USE_INTERNAL_DAC
void i2sInit() {
  pinMode(25, OUTPUT);
  pinMode(26, OUTPUT);

  i2s_config_t i2s_config = {
    .mode = (i2s_mode_t)(I2S_MODE_MASTER | I2S_MODE_TX | I2S_MODE_DAC_BUILT_IN),
    .sample_rate =  SAMPLE_RATE,
    .bits_per_sample = I2S_BITS_PER_SAMPLE_16BIT,
    .channel_format = I2S_CHANNEL_FMT_RIGHT_LEFT,
    .communication_format = I2S_COMM_FORMAT_STAND_MSB,
    .intr_alloc_flags = ESP_INTR_FLAG_LEVEL2,
    .dma_buf_count = DMA_NUM_BUF,
    .dma_buf_len = DMA_BUF_LEN,
    .use_apll = false
  };

  i2s_driver_install(i2s_num, &i2s_config, 0, NULL);
  i2s_set_dac_mode(I2S_DAC_CHANNEL_BOTH_EN);
  i2s_set_pin(i2s_num, NULL);
  i2s_zero_dma_buffer(i2s_num);
}
#else
void i2sInit() {
  i2s_config_t i2s_config = {
    .mode = (i2s_mode_t)(I2S_MODE_MASTER | I2S_MODE_TX ),
    .sample_rate = SAMPLE_RATE,
    .bits_per_sample = I2S_BITS_PER_SAMPLE_16BIT,
    .channel_format = I2S_CHANNEL_FMT_RIGHT_LEFT,
    .communication_format = (i2s_comm_format_t)(I2S_COMM_FORMAT_STAND_I2S ),
//   .communication_format =  (i2s_comm_format_t)(I2S_LSB_FORMAT), // VDA1334
    .intr_alloc_flags = ESP_INTR_FLAG_LEVEL2,
    .dma_buf_count = DMA_NUM_BUF,
    .dma_buf_len = DMA_BUF_LEN,
    .use_apll = true,
  };

  i2s_pin_config_t i2s_pin_config = {
    .bck_io_num = I2S_BCLK_PIN,
    .ws_io_num =  I2S_WCLK_PIN,
    .data_out_num = I2S_DOUT_PIN
  };

  i2s_driver_install(i2s_num, &i2s_config, 0, NULL);

  i2s_set_pin(i2s_num, &i2s_pin_config);
  i2s_zero_dma_buffer(i2s_num);

  DEBF("I2S is started: BCK %d, WCK %d, DAT %d\r\n", I2S_BCLK_PIN, I2S_WCLK_PIN, I2S_DOUT_PIN);
}
#endif

void i2sDeinit() {
  i2s_zero_dma_buffer(i2s_num);
  i2s_driver_uninstall(i2s_num);
}