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1. /**
   
2. * ESP32 I2S Noise Level Example.
   
3. *
   
4. * This example calculates a mean noise level.
   
5. * This example is Public Domain.
   
6. *
   
7. * @author maspetsberger
   
8. */
   
9. 
   
10. #include <driver/i2s.h>
    
11. 
    
12. const i2s_port_t I2S_PORT = I2S_NUM_0;
    
13. const int BLOCK_SIZE = 1024;
    
14. 
    
15. void setup() {
    
16.   Serial.begin(115200);
    
17.   Serial.println("Configuring I2S...");
    
18.   esp_err_t err;
    
19. 
    
20.   // The I2S config as per the example
    
21.   const i2s_config_t i2s_config = {
    
22.       .mode = i2s_mode_t(I2S_MODE_MASTER | I2S_MODE_RX), // Receive, not transfer
    
23.       .sample_rate = 16000,                         // 16KHz
    
24.       .bits_per_sample = I2S_BITS_PER_SAMPLE_32BIT, // could only get it to work with 32bits
    
25.       .channel_format = I2S_CHANNEL_FMT_ONLY_RIGHT, // although the SEL config should be left, it seems to transmit on right
    
26.       .communication_format = i2s_comm_format_t(I2S_COMM_FORMAT_I2S | I2S_COMM_FORMAT_I2S_MSB),
    
27.       .intr_alloc_flags = ESP_INTR_FLAG_LEVEL1,     // Interrupt level 1
    
28.       .dma_buf_count = 8,                           // number of buffers
    
29.       .dma_buf_len = BLOCK_SIZE                     // samples per buffer
    
30.   };
    
31. 
    
32.   // The pin config as per the setup
    
33.   const i2s_pin_config_t pin_config = {
    
34.       .bck_io_num = 10,   // BCKL
    
35.       .ws_io_num = 18,    // LRCL
    
36.       .data_out_num = -1, // not used (only for speakers)
    
37.       .data_in_num = 19   // DOUT
    
38.   };
    
39. 
    
40.   // Configuring the I2S driver and pins.
    
41.   // This function must be called before any I2S driver read/write operations.
    
42.   err = i2s_driver_install(I2S_PORT, &i2s_config, 0, NULL);
    
43.   if (err != ESP_OK) {
    
44.     Serial.printf("Failed installing driver: %d\n", err);
    
45.     while (true);
    
46.   }
    
47.   err = i2s_set_pin(I2S_PORT, &pin_config);
    
48.   if (err != ESP_OK) {
    
49.     Serial.printf("Failed setting pin: %d\n", err);
    
50.     while (true);
    
51.   }
    
52.   Serial.println("I2S driver installed.");
    
53. }
    
54. 
    
55. void loop() {
    
56. 
    
57.   // Read multiple samples at once and calculate the sound pressure
    
58.   int32_t samples[BLOCK_SIZE];
    
59.   int num_bytes_read = i2s_read_bytes(I2S_PORT,
    
60.                                       (char *)samples,
    
61.                                       BLOCK_SIZE,     // the doc says bytes, but its elements.
    
62.                                       portMAX_DELAY); // no timeout
    
63.   
    
64.   int samples_read = num_bytes_read / 8;
    
65.   if (samples_read > 0) {
    
66. 
    
67.     float mean = 0;
    
68.     for (int i = 0; i < samples_read; ++i) {
    
69.       mean += samples[i];
    
70.     }
    
71.     Serial.println(mean);
    
72.   }
    
73. }
    
74. 
    
75. // actually we would need to call `i2s_driver_uninstall(I2S_PORT)` upon exit.

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