I2S Library Examples

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1/*
2
3 This example reads audio data from an Invensense's ICS43432 I2S microphone
4
5 breakout board, and prints out the samples to the Serial console. The
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7 Serial Plotter built into the Arduino IDE can be used to plot the audio
8
9 data (Tools -> Serial Plotter)
10
11 Circuit:
12
13 * Arduino Zero, MKR family and Nano 33 IoT
14
15 * ICS43432:
16
17   * GND connected GND
18
19   * 3.3V connected to 3.3V (Zero, Nano) or VCC (MKR)
20
21   * WS connected to pin 0 (Zero) or 3 (MKR) or A2 (Nano)
22
23   * CLK connected to pin 1 (Zero) or 2 (MKR) or A3 (Nano)
24
25   * SD connected to pin 9 (Zero) or A6 (MKR) or 4 (Nano)
26
27 created 17 November 2016
28
29 by Sandeep Mistry
30
31 */
32
33#include <I2S.h>
34
35void setup() {
36
37  // Open serial communications and wait for port to open:
38
39  // A baud rate of 115200 is used instead of 9600 for a faster data rate
40
41  // on non-native USB ports
42
43  Serial.begin(115200);
44
45  while (!Serial) {
46
47    ; // wait for serial port to connect. Needed for native USB port only
48
49  }
50
51  // start I2S at 8 kHz with 32-bits per sample
52
53  if (!I2S.begin(I2S_PHILIPS_MODE, 8000, 32)) {
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55    Serial.println("Failed to initialize I2S!");
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57    while (1); // do nothing
58
59  }
60}
61
62void loop() {
63
64  // read a sample
65
66  int sample = I2S.read();
67
68  if (sample) {
69
70    // if it's non-zero print value to serial
71
72    Serial.println(sample);
73
74  }
75}

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1/*
2
3 This example generates a square wave based tone at a specified frequency
4
5 and sample rate. Then outputs the data using the I2S interface to a
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7 MAX98357 I2S Amp Breakout board.
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9 Circuit:
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11 * Arduino Zero, MKR family and Nano 33 IoT
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13 * MAX98357:
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15   * GND connected GND
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17   * VIN connected 5V
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19   * LRC connected to pin 0 (Zero) or 3 (MKR) or A2 (Nano)
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21   * BCLK connected to pin 1 (Zero) or 2 (MKR) or A3 (Nano)
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23   * DIN connected to pin 9 (Zero) or A6 (MKR) or 4 (Nano)
24
25 created 17 November 2016
26
27 by Sandeep Mistry
28
29 */
30
31#include <I2S.h>
32
33const int frequency = 440; // frequency of square wave in Hz
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35const int amplitude = 500; // amplitude of square wave
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37const int sampleRate = 8000; // sample rate in Hz
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39const int halfWavelength = (sampleRate / frequency) / 2; // half wavelength of square wave
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41short sample = amplitude; // current sample value
42int count = 0;
43
44void setup() {
45
46  Serial.begin(9600);
47
48  Serial.println("I2S simple tone");
49
50  // start I2S at the sample rate with 16-bits per sample
51
52  if (!I2S.begin(I2S_PHILIPS_MODE, sampleRate, 16)) {
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54    Serial.println("Failed to initialize I2S!");
55
56    while (1); // do nothing
57
58  }
59}
60
61void loop() {
62
63  if (count % halfWavelength == 0) {
64
65    // invert the sample every half wavelength count multiple to generate square wave
66
67    sample = -1 * sample;
68
69  }
70
71  // write the same sample twice, once for left and once for the right channel
72
73  I2S.write(sample);
74
75  I2S.write(sample);
76
77  // increment the counter for the next sample
78
79  count++;
80}