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

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

   i2s_config_t i2s_config = {
      .mode = (i2s_mode_t)(I2S_MODE_MASTER | I2S_MODE_TX | I2S_MODE_RX),
      .sample_rate = 44100,
      .bits_per_sample = I2S_BITS_PER_SAMPLE_32BIT,
      .channel_format = I2S_CHANNEL_FMT_RIGHT_LEFT,
      .communication_format = I2S_COMM_FORMAT_STAND_MSB,
      .intr_alloc_flags = 0,
      .dma_buf_count = 6,
      .dma_buf_len = 512,
      .tx_desc_auto_clear = true
   };
   i2s_driver_install(I2S_NUM_0, &i2s_config, 0, NULL);

   i2s_pin_config_t pin_config = {
      .mck_io_num = 3, // ESP32 pin 34, wESP32 net TX
      .bck_io_num = 26,
      .ws_io_num = 25,
      .data_out_num = 22,
      .data_in_num = 19
   };
   i2s_set_pin(I2S_NUM_0, &pin_config);

   Serial.println("Ready!");
}

void loop () {
   Serial.println("OK");
   delay(1000);
}