Eğitimler
I2SSimpleTone
Bu örnekte, SAMD21 tabanlı bir kart ( MKRZero , MKR1000 veya Zero) ve Adafruit MAX98357A gibi bir I2S DAC kullanarak basit bir tonun nasıl oluşturulacağı gösterilmektedir.
Devre
Bu örneği çalıştırmak için, kartı ve I2S DAC'yi resimde gösterildiği gibi I2S veri yolunu kullanarak bağlamanız yeterlidir. Görüntü MKRZero içindir ; sıfır ve MKR1000 için uygun pinleri çizimin başında, yorumlarda bulabilirsiniz.
Kod
/*
This example generates a square wave based tone at a specified frequency
and sample rate. Then outputs the data using the I2S interface to a
MAX08357 I2S Amp Breakout board.
Circuit:
* Arduino/Genuino Zero, MKR family and Nano 33 IoT
* MAX08357:
* GND connected GND
* VIN connected 5V
* LRC connected to pin 0 (Zero) or 3 (MKR) or A2 (Nano)
* BCLK connected to pin 1 (Zero) or 2 (MKR) or A3 (Nano)
* DIN connected to pin 9 (Zero) or A6 (MKR) or 4 (Nano)
created 17 November 2016
by Sandeep Mistry
*/
#include <I2S.h>
const int frequency = 440; // frequency of square wave in Hz
const int amplitude = 500; // amplitude of square wave
const int sampleRate = 8000; // sample rate in Hz
const int halfWavelength = (sampleRate / frequency); // half wavelength of square wave
short sample = amplitude; // current sample value
int count = 0;
void setup() {
Serial.begin(9600);
Serial.println("I2S simple tone");
// start I2S at the sample rate with 16-bits per sample
if (!I2S.begin(I2S_PHILIPS_MODE, sampleRate, 16)) {
Serial.println("Failed to initialize I2S!");
while (1); // do nothing
}
}
void loop() {
if (count % halfWavelength == 0) {
// invert the sample every half wavelength count multiple to generate square wave
sample = -1 * sample;
}
// write the same sample twice, once for left and once for the right channel
I2S.write(sample);
I2S.write(sample);
// increment the counter for the next sample
count++;
}
This example generates a square wave based tone at a specified frequency
and sample rate. Then outputs the data using the I2S interface to a
MAX08357 I2S Amp Breakout board.
Circuit:
* Arduino/Genuino Zero, MKR family and Nano 33 IoT
* MAX08357:
* GND connected GND
* VIN connected 5V
* LRC connected to pin 0 (Zero) or 3 (MKR) or A2 (Nano)
* BCLK connected to pin 1 (Zero) or 2 (MKR) or A3 (Nano)
* DIN connected to pin 9 (Zero) or A6 (MKR) or 4 (Nano)
created 17 November 2016
by Sandeep Mistry
*/
#include <I2S.h>
const int frequency = 440; // frequency of square wave in Hz
const int amplitude = 500; // amplitude of square wave
const int sampleRate = 8000; // sample rate in Hz
const int halfWavelength = (sampleRate / frequency); // half wavelength of square wave
short sample = amplitude; // current sample value
int count = 0;
void setup() {
Serial.begin(9600);
Serial.println("I2S simple tone");
// start I2S at the sample rate with 16-bits per sample
if (!I2S.begin(I2S_PHILIPS_MODE, sampleRate, 16)) {
Serial.println("Failed to initialize I2S!");
while (1); // do nothing
}
}
void loop() {
if (count % halfWavelength == 0) {
// invert the sample every half wavelength count multiple to generate square wave
sample = -1 * sample;
}
// write the same sample twice, once for left and once for the right channel
I2S.write(sample);
I2S.write(sample);
// increment the counter for the next sample
count++;
}
[Kodu Al]
See Also
- I2S library- I2S Kütüphanesi referansınız.
- MKR Zero- MKRZero kartı için ürün detayları.
- Input Serial Plotter- Seri plotter üzerindeki ses verilerini görselleştirin.