60 lines
1.5 KiB
Arduino
60 lines
1.5 KiB
Arduino
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/*
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This example is only for ESP
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This example demonstrates simultaneous usage of microphone and speaker using single I2S module.
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The application transfers data from input to output
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Circuit:
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* ESP32
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* GND connected GND
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* VIN connected 5V
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* SCK 5
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* FS 25
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* DIN 35
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* DOUT 26
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* I2S microphone
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* I2S decoder + headphones / speaker
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created 8 October 2021
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by Tomas Pilny
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*/
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#include <I2S.h>
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const long sampleRate = 16000;
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const int bitsPerSample = 32;
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uint8_t *buffer;
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void setup() {
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Serial.begin(115200);
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//I2S.setAllPins(5, 25, 35, 26); // you can change default pins; order of pins = (CLK, WS, IN, OUT)
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if(!I2S.setDuplex()){
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Serial.println("ERROR - could not set duplex");
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while(true){
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vTaskDelay(10); // Cannot continue
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}
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}
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if (!I2S.begin(I2S_PHILIPS_MODE, sampleRate, bitsPerSample)) {
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Serial.println("Failed to initialize I2S!");
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while(true){
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vTaskDelay(10); // Cannot continue
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}
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}
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buffer = (uint8_t*) malloc(I2S.getBufferSize() * (bitsPerSample / 8));
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if(buffer == NULL){
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Serial.println("Failed to allocate buffer!");
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while(true){
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vTaskDelay(10); // Cannot continue
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}
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}
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Serial.println("Setup done");
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}
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void loop() {
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//I2S.write(I2S.read()); // primitive implementation sample-by-sample
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// Buffer based implementation
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I2S.read(buffer, I2S.getBufferSize() * (bitsPerSample / 8));
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I2S.write(buffer, I2S.getBufferSize() * (bitsPerSample / 8));
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//optimistic_yield(1000); // yield if last yield occurred before <parameter> CPU clock cycles ago
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}
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