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libraries/audio-tools/examples/examples-stream/streams-generator-merge-pwm/streams-generator-merge-pwm.ino

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+/**
+ * @file streams-generator-merge-pwm.ino
+ * @brief merge 2 mono signals into 1 stereo signal
+ * @author Phil Schatzmann
+ * @copyright GPLv3
+ */
+ 
+#include "AudioTools.h"
+
+AudioInfo info_in(8000, 1, 16);
+AudioInfo info_out(8000, 2, 16);
+SineWaveGenerator<int16_t> sineWave1(32000); // subclass of SoundGenerator with max amplitude of 32000
+GeneratedSoundStream<int16_t> sound1(sineWave1);  // Stream generated from sine wave
+SineWaveGenerator<int16_t> sineWave2(32000); // subclass of SoundGenerator with max amplitude of 32000
+GeneratedSoundStream<int16_t> sound2(sineWave2);  // Stream generated from sine wave
+InputMerge<int16_t> imerge;
+PWMAudioOutput pwm;   
+StreamCopy copier(pwm, imerge);    // copy in to out
+
+
+void setup() {
+  Serial.begin(115200);
+  AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Warning);  
+
+  // setup sine 2 mono sine waves
+  sineWave1.begin(info_in, N_B4);
+  sineWave2.begin(info_in, N_B5);
+
+  // merge input to stereo
+  imerge.add(sound1, 1);
+  imerge.add(sound2, 1);
+  imerge.begin(info_out);
+
+  // setup PWM output
+  auto config = pwm.defaultConfig();
+  config.copyFrom(info_out);
+  //config.resolution = 8;  // must be between 8 and 11 -> drives pwm frequency (8 is default)
+  // alternative 1
+  //config.start_pin = 3;
+  // alternative 2
+  //int pins[] = {3};
+  // alternative 3
+  Pins pins = {3, 4};
+  config.setPins(pins); 
+  pwm.begin(config);
+}
+
+void loop(){
+  copier.copy();
+}