/**
 * @file streams-generator-i2s-pdm.ino
 * @author Phil Schatzmann
 * @brief see https://github.com/pschatzmann/arduino-audio-tools/blob/main/examples/examples-stream/streams-generator-i2s-pdm/README.md 
 * @copyright GPLv3
 */
 
#include "AudioTools.h"
AudioInfo info(44100, 2, 16);
SineWaveGenerator<int16_t> sineWave(32000); // subclass of SoundGenerator with max amplitude of 32000
GeneratedSoundStream<int16_t> sound(sineWave); // Stream generated from sine wave
I2SStream out; 
StreamCopy copier(out, sound); // copies sound into i2s
// Arduino Setup
void setup(void) { 
 // Open Serial 
 Serial.begin(115200);
 while(!Serial);
 AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Info);
 // start I2S
 Serial.println("starting I2S...");
 auto config = out.defaultConfig(TX_MODE);
 // special PDM config starts here...
 config.signal_type = PDM; // Use PDM
 config.pin_data = 6; // Pin on that audio comes out (but Left+Right is merged together!)
 config.pin_bck = 17; // Pin where clock comes out (you MUST select a pin even if nothing is connected to it, otherwise no audio output even from .pin_data!)
 // ...end of PDM config. Rest is standard config.
 
 config.copyFrom(info); 
 out.begin(config);
 // Setup sine wave
 sineWave.begin(info, N_B4);
 Serial.println("started...");
}
// Arduino loop - copy sound to out 
void loop() {
 copier.copy();
}