I2S-microphone-dat

go advance

• simultaneous data = microphones with TDM (Time-Division Multiplexing)

demo code for interleaved data

#include <driver/i2s.h>

// I2S configuration
#define I2S_NUM         I2S_NUM_0  // I2S port number
#define SAMPLE_RATE     16000      // Sampling rate in Hz
#define I2S_BCK_PIN     26         // Bit clock pin (SCK)
#define I2S_WS_PIN      25         // Word select pin (WS/LRCLK)
#define I2S_DATA_PIN    22         // Serial data pin (SD)

#define BUFFER_SIZE     1024       // Buffer size for audio data

void setup() {
Serial.begin(115200);

// Configure I2S
i2s_config_t i2s_config = {
    .mode = (i2s_mode_t)(I2S_MODE_MASTER | I2S_MODE_RX), // Master receive mode
    .sample_rate = SAMPLE_RATE,
    .bits_per_sample = I2S_BITS_PER_SAMPLE_32BIT,        // 32-bit data
    .channel_format = I2S_CHANNEL_FMT_RIGHT_LEFT,        // Stereo format
    .communication_format = I2S_COMM_FORMAT_I2S,
    .intr_alloc_flags = ESP_INTR_FLAG_LEVEL1,            // Interrupt level 1
    .dma_buf_count = 4,                                  // Number of DMA buffers
    .dma_buf_len = BUFFER_SIZE                           // DMA buffer size
};

// Configure I2S pins
i2s_pin_config_t pin_config = {
    .bck_io_num = I2S_BCK_PIN,
    .ws_io_num = I2S_WS_PIN,
    .data_out_num = I2S_PIN_NO_CHANGE,
    .data_in_num = I2S_DATA_PIN
};

// Install and start I2S
i2s_driver_install(I2S_NUM, &i2s_config, 0, NULL);
i2s_set_pin(I2S_NUM, &pin_config);
i2s_zero_dma_buffer(I2S_NUM);

Serial.println("I2S initialized!");
}

void loop() {
int32_t i2s_buffer[BUFFER_SIZE]; // Buffer for interleaved audio data
size_t bytes_read;

// Read data from I2S
i2s_read(I2S_NUM, i2s_buffer, sizeof(i2s_buffer), &bytes_read, portMAX_DELAY);

// Process interleaved data
size_t samples_read = bytes_read / sizeof(int32_t);
for (size_t i = 0; i < samples_read; i += 2) {
    int32_t left_channel = i2s_buffer[i];     // Left channel (Microphone 1)
    int32_t right_channel = i2s_buffer[i+1]; // Right channel (Microphone 2)

    // Print the audio data for debugging
    Serial.print("Left: ");
    Serial.print(left_channel);
    Serial.print(" | Right: ");
    Serial.println(right_channel);
}
}