├── HTB1CLnxSiLaK1RjSZFxq6ymPFXaM.jpg
├── README.md
├── s_Mic_Plot_TTGO.ino
└── ICS43434.h


/HTB1CLnxSiLaK1RjSZFxq6ymPFXaM.jpg:
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https://raw.githubusercontent.com/elshnkhll/ICS43434/HEAD/HTB1CLnxSiLaK1RjSZFxq6ymPFXaM.jpg


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/README.md:
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1 | # ICS43434
2 | MEMS microphone Invensense ICS-43434 is connected to ESP32 via I2S bus.
3 | 
4 | Specs: https://www.invensense.com/wp-content/uploads/2016/02/DS-000069-ICS-43434-v1.1.pdf
5 | 
6 | Roku Remote Control: http://rokurc.com
7 | 


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/s_Mic_Plot_TTGO.ino:
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 1 | #include <WiFi.h>
 2 | #include "driver/i2s.h"
 3 | #include "ICS43434.h"
 4 | 
 5 | 
 6 | void setup()
 7 | {
 8 |   Serial.begin(115200);
 9 |   //Turn off WIFI to save power
10 |   WiFi.mode(WIFI_OFF);
11 | 
12 |   Mic_Init();
13 |   delay(1000);
14 | }
15 | 
16 | void loop(){
17 | 
18 |   int32_t a = Mic_Get_Sample();
19 |   Serial.println( a, DEC  );
20 |   yield();
21 |   
22 | }
23 | 


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/ICS43434.h:
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 1 | unsigned short int numOfBlanks = 500, smoothingReads = 3;
 2 | 
 3 | i2s_config_t i2s_config = {
 4 | mode: (i2s_mode_t)(I2S_MODE_MASTER | I2S_MODE_RX),
 5 |   sample_rate: 8000 * smoothingReads,
 6 | bits_per_sample: I2S_BITS_PER_SAMPLE_32BIT,
 7 | channel_format: I2S_CHANNEL_FMT_ONLY_RIGHT,
 8 | communication_format: (i2s_comm_format_t)(I2S_COMM_FORMAT_I2S | I2S_COMM_FORMAT_I2S_LSB),
 9 | intr_alloc_flags: ESP_INTR_FLAG_LEVEL1,
10 |   dma_buf_count: 8,
11 |   dma_buf_len: 8
12 | };
13 | 
14 | i2s_pin_config_t pin_config = {
15 |   .bck_io_num   = 32,                // BCK  (SCK)    - bit clock or serial clock
16 |   .ws_io_num    = 33,                // LRCK (WS, FS) - left-right clock or word select or frame sync
17 |   .data_out_num = I2S_PIN_NO_CHANGE, // DATA output   - not used
18 |   .data_in_num  = 27                 // DIN  (SD)     - serial data in  (SDATA, SDIN, SDOUT, DACDAT, ADCDAT)
19 | };
20 | 
21 | const int i2s_num = 0;
22 | int retStat = 0;
23 | 
24 | 
25 | uint32_t sampleIn = 0;
26 | 
27 | 
28 | int32_t avgSampleIn = 0;
29 | 
30 | 
31 | void Mic_Init() {
32 |   pinMode(27, INPUT);
33 |   //Set up pin 21 and 25 as the BCK and LRCK pins
34 |   pinMode(32, OUTPUT);
35 |   pinMode(33, OUTPUT);
36 |   //Init the i2s device
37 |   i2s_driver_install((i2s_port_t)i2s_num, &i2s_config, 0, NULL);
38 |   i2s_set_pin((i2s_port_t)i2s_num, &pin_config);
39 |   i2s_start((i2s_port_t)i2s_num);
40 | 
41 |   Serial.print("\r\nBegin Level detect...");
42 |   Serial.print("\r\n\tRead 4000 samples to level out...");
43 |   
44 |   //This pulls in a bunch of samples and does nothing, its just used to settle the mics output
45 |   for (retStat = 0; retStat < numOfBlanks * 2; retStat++)  {
46 |     i2s_pop_sample((i2s_port_t)i2s_num, (char*)&sampleIn, portMAX_DELAY);
47 |     delay(1);
48 |   }
49 | 
50 | }
51 | 
52 | int32_t Mic_Get_Sample() {
53 |   sampleIn = 0;
54 |   avgSampleIn = 0;
55 |   int16_t sampleIn16 = 0;
56 |   //read in smoothingReads number of times and use the average
57 |   for (retStat = 0; retStat < smoothingReads; retStat++)  {
58 |     i2s_pop_sample((i2s_port_t)i2s_num, (char*)&sampleIn, portMAX_DELAY);
59 |     sampleIn >>= 8;
60 |     sampleIn16 = sampleIn;
61 |     avgSampleIn += sampleIn16;
62 |   }
63 | 
64 |   sampleIn16 = round((float)avgSampleIn / smoothingReads);
65 | 
66 |   avgSampleIn = round( ((float)(sampleIn16 + 0x8000) / 0x8000 ) * 16000 ); 
67 | 
68 |   return avgSampleIn;
69 | 
70 | }
71 | 


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