i2s

#include <Arduino.h>
#include "driver/i2s.h"

#define I2S_PORT I2S_NUM_0
#define ADC_CHANNEL ADC1_CHANNEL_6 // GPIO34

void setup() {
Serial.begin(115200);
Serial.println("Initializing I2S ADC...");

// Configure I2S for ADC mode
i2s_config_t i2s_config = {
.mode = (i2s_mode_t)(I2S_MODE_MASTER | I2S_MODE_ADC_BUILT_IN),
.sample_rate = 44100,
.bits_per_sample = I2S_BITS_PER_SAMPLE_16BIT,
.channel_format = I2S_CHANNEL_FMT_ONLY_LEFT,
.communication_format = I2S_COMM_FORMAT_I2S_MSB,
.intr_alloc_flags = ESP_INTR_FLAG_LEVEL1,
.dma_buf_count = 4,
.dma_buf_len = 1024
};

esp_err_t err = i2s_driver_install(I2S_PORT, &i2s_config, 0, NULL);
if (err != ESP_OK) {
Serial.printf("I2S driver install failed: %d\n", err);
return;
}
Serial.println("I2S driver installed successfully.");

// Set ADC mode for I2S
i2s_set_adc_mode(ADC_UNIT_1, ADC_CHANNEL);
Serial.println("ADC mode set for I2S.");

// Enable I2S ADC mode
err = i2s_adc_enable(I2S_PORT);
if (err != ESP_OK) {
Serial.printf("I2S ADC enable failed: %d\n", err);
return;
}
Serial.println("I2S ADC enabled successfully.");
}

void loop() {
uint16_t adcBuffer[1];
size_t bytesRead;

esp_err_t err = i2s_read(I2S_PORT, adcBuffer, sizeof(adcBuffer), &bytesRead, portMAX_DELAY);
if (err != ESP_OK) {
Serial.printf("I2S read failed: %d\n", err);
delay(1000);
return;
}

uint16_t adcValue = adcBuffer[0] & 0xFFF;
Serial.printf("ADC Value: %d\n", adcValue);
delay(100);
}


I get this:
Initializing I2S ADC...
I2S driver installed successfully.
ADC mode set for I2S.
E (16) i2s(legacy): i2s_adc_enable(899): i2s built-in adc not enabled
I2S ADC enable failed: 259
E (28) i2s(legacy): i2s_read(1739): RX mode is not enabled
I2S read failed: 258