ESP32 DIGITAL SOUND IN AND OUT

PrzezPatryk

After many tries it worked to connect digital mic and digital out to esp32 using two i2s interfaces.

Microphone circuit is sph0645 and output is max 98357a.

Below is a description of what pins i used and simple code to direct input from mic to output.

Using 4 pins to microphone in: SEL to VIN

22 – dout

25 – bclk

26 – lrcl

Output pins:

18 – bclk

19 – lrc

21 – din

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

#define I2S_SAMPLE_RATE   (44100)
#define I2S_SAMPLE_BITS   (16)
#define I2S_NUM_CHANNELS  (1)
#define I2S_DMA_BUFFER    (2048)
#define I2S_LRCK_PIN      (26)
#define I2S_BCLK_PIN      (25)
#define I2S_DOUT_PIN      (22)

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


  i2s_config_t i2s_config = {
   .mode = (i2s_mode_t)(I2S_MODE_MASTER | I2S_MODE_RX),
  .sample_rate = I2S_SAMPLE_RATE,
  .bits_per_sample = I2S_BITS_PER_SAMPLE_32BIT,
  .channel_format = I2S_CHANNEL_FMT_ONLY_LEFT,
  .communication_format = (i2s_comm_format_t)(I2S_COMM_FORMAT_I2S),
  .intr_alloc_flags = ESP_INTR_FLAG_LEVEL1,
  .dma_buf_count = 32,
  .dma_buf_len = 512,
  .use_apll = false
  };
  i2s_pin_config_t pin_config = {
    .bck_io_num = I2S_BCLK_PIN,
    .ws_io_num = I2S_LRCK_PIN,
    .data_out_num = I2S_PIN_NO_CHANGE,
    .data_in_num = I2S_DOUT_PIN
  };
  i2s_driver_install((i2s_port_t)I2S_NUM_0, &i2s_config, 0, NULL);
  i2s_set_pin((i2s_port_t)I2S_NUM_0, &pin_config);

 
  i2s_config_t i2s_config2 = {
   .mode = (i2s_mode_t)(I2S_MODE_MASTER | I2S_MODE_TX),
  .sample_rate = I2S_SAMPLE_RATE,
  .bits_per_sample = I2S_BITS_PER_SAMPLE_32BIT,
  .channel_format = I2S_CHANNEL_FMT_ONLY_LEFT,
  .communication_format = (i2s_comm_format_t)(I2S_COMM_FORMAT_I2S),
  .intr_alloc_flags = ESP_INTR_FLAG_LEVEL1,
  .dma_buf_count = 32,
  .dma_buf_len = 512,
  .use_apll = false
  };
  i2s_pin_config_t pin_config2 = {
    .bck_io_num = 18,
    .ws_io_num = 19,
    .data_out_num = 21,
    .data_in_num = I2S_PIN_NO_CHANGE
  };
  i2s_driver_install((i2s_port_t)I2S_NUM_1, &i2s_config2, 0, NULL);
  i2s_set_pin((i2s_port_t)I2S_NUM_1, &pin_config2);

  Serial.println("Mikrofon jest gotowy");




}

void loop() {
   // Bufor odczytu I2S
  static const int I2S_BUFLEN = 512;
  //static int16_t i2s_buf[I2S_BUFLEN];
  //size_t bytes_read = 0;
  size_t bytes_read;
  size_t bytes_w;
  uint8_t i2s_read_buffer[512];

  // Odczytanie danych z mikrofonu
  i2s_read(I2S_NUM_0, &i2s_read_buffer, 512, &bytes_read, portMAX_DELAY);
  i2s_write(I2S_NUM_1, &i2s_read_buffer, bytes_read,&bytes_w, portMAX_DELAY);

}

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