i2s for esp32

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

// Define I2S port and ADC configuration
#define I2S_PORT I2S_NUM_0
#define ADC_CHANNEL ADC1_CHANNEL_6 // GPIO34

void setup() {
    Serial.begin(115200);
    delay(100); // Allow time for Serial Monitor to initialize

    Serial.println("Initializing I2S ADC...");

    // Configure I2S for ADC mode
    i2s_config_t i2s_config = {
        .mode = (i2s_mode_t)(I2S_MODE_MASTER | I2S_MODE_RX | I2S_MODE_ADC_BUILT_IN), // Master mode, RX, ADC input
        .sample_rate = 44100, // Sampling rate
        .bits_per_sample = I2S_BITS_PER_SAMPLE_16BIT, // 16-bit samples
        .channel_format = I2S_CHANNEL_FMT_ONLY_LEFT, // Single channel
        .communication_format = I2S_COMM_FORMAT_I2S, // I2S format
        .intr_alloc_flags = ESP_INTR_FLAG_LEVEL1, // Interrupt priority
        .dma_buf_count = 4, // Number of DMA buffers
        .dma_buf_len = 1024 // Size of each DMA buffer
    };

    // Install I2S driver
    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.");

    // Configure ADC width and attenuation
    adc1_config_width(ADC_WIDTH_BIT_12); // 12-bit resolution
    adc1_config_channel_atten(ADC_CHANNEL, ADC_ATTEN_DB_6); // Attenuation for 0–2.5V range
    Serial.println("ADC configured successfully.");

    // Set ADC mode for I2S
    i2s_set_adc_mode(ADC_UNIT_1, ADC_CHANNEL);

    // Enable ADC mode on I2S
    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.");

    // Start I2S
    i2s_start(I2S_PORT);
    Serial.println("I2S started successfully.");
}

void loop() {
    uint16_t adcBuffer[1]; // Buffer to store ADC value
    size_t bytesRead;

    // Read data from I2S
    esp_err_t err = i2s_read(I2S_PORT, adcBuffer, sizeof(adcBuffer), &bytesRead, 1000 / portTICK_PERIOD_MS);

    if (err != ESP_OK) {
        Serial.printf("I2S read failed: %d\n", err);
        delay(1000);
        return;
    }

    if (bytesRead == 0) {
        Serial.println("No data read from ADC.");
        delay(1000);
        return;
    }

    // Extract 12-bit ADC value
    uint16_t adcValue = adcBuffer[0] & 0xFFF;

    // Print ADC value
    Serial.printf("ADC Value: %d\n", adcValue);
    delay(100); // Slow down the output for readability
}