I2S config

#define I2S_NUM         (0)

void configure_i2s() {
  //i2s_adc_disable(I2S_NUM_0);
  i2s_config_t i2s_config = {
    .mode = (i2s_mode_t)(I2S_MODE_MASTER | I2S_MODE_RX | I2S_MODE_ADC_BUILT_IN),  // I2S receive mode with ADC
    .sample_rate = samplingFrequency,                       // sample rate
    .bits_per_sample = I2S_BITS_PER_SAMPLE_16BIT,           // 16 bit I2S
    .channel_format = I2S_CHANNEL_FMT_ONLY_LEFT,            // only the right channel
    //.channel_format = I2S_CHANNEL_FMT_RIGHT_LEFT,
    .communication_format = I2S_COMM_FORMAT_I2S_MSB,        // I2S format
    .intr_alloc_flags = 0,                                  // none
    .dma_buf_count = 16, //8                                 // number of DMA buffers
    .dma_buf_len = NUM_SAMPLES,                             // number of samples
    .use_apll = 0,                                          // no Audio PLL
  };

   // ADC channel 0 with 11db (divide by input 3.6)
  adc1_config_channel_atten(ADC_CHANNEL, ADC_ATTEN_11db);
  // 12 bit ADC
  adc1_config_width(ADC_WIDTH_12Bit);
  // install I2S 0 driver, using event queue
  i2s_driver_install(I2S_NUM_0, &i2s_config, 0, NULL);
  // ADC should use ADC_CHANNEL
  i2s_set_adc_mode(ADC_UNIT_1, ADC_CHANNEL);
  //vTaskDelay(5000/portTICK_RATE_MS);
  // The raw ADC data is written in DMA in inverted form. This add aninversion:
  SET_PERI_REG_MASK(SYSCON_SARADC_CTRL2_REG, SYSCON_SARADC_SAR1_INV);

  // enable I2S ADC
  i2s_adc_enable(I2S_NUM_0);
}