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libraries/audio-tools/examples/examples-stream/streams-adsr-i2s/streams-adsr-i2s.ino

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+/**
+ * @file streams-adsr-i2s.ino
+ * @author Phil Schatzmann
+ * @brief Simple example for AudioEffects with ADSR
+ * @copyright GPLv3
+ * 
+ */
+#include "AudioTools.h"
+//#include "AudioTools/AudioLibs/AudioBoardStream.h"
+
+I2SStream i2s; //AudioBoardStream
+SineWaveGenerator<int16_t> sine;
+GeneratedSoundStream<int16_t> stream(sine); 
+AudioEffectStream effects(stream);
+ADSRGain adsr(0.0001,0.0001, 0.9 , 0.0002);
+StreamCopy copier(i2s, effects); 
+uint64_t time_on;
+uint64_t time_off;
+
+
+void actionKeyOn(float note){
+  Serial.println("KeyOn");
+  sine.setFrequency(note);
+  adsr.keyOn();
+}
+
+void actionKeyOff(){
+  Serial.println("KeyOff");
+  adsr.keyOff();
+}
+
+void setup() {
+  Serial.begin(115200);
+  AudioLogger::instance().begin(Serial,AudioLogger::Warning);
+
+  // setup effects
+  effects.addEffect(adsr);
+
+  // Setup output
+  auto cfg = i2s.defaultConfig(TX_MODE);
+  //i2s.setVolume(1.0);
+  i2s.begin(cfg);
+
+  // Setup sound generation based on AudioKit settins
+  sine.begin(cfg, 0);
+  stream.begin(cfg);
+  effects.begin(cfg);
+
+}
+
+// copy the data
+void loop() {
+  copier.copy();
+
+  uint64_t time = millis();
+  if (time>time_off){
+    actionKeyOff();
+    time_on = time+1000;
+    time_off = time+2000;
+  }
+  if (time>time_on){
+    actionKeyOn(N_C3);
+    time_on = time+2000;
+    time_off = time+1000;
+  }
+}