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libraries/audio-tools/examples/examples-dsp/examples-mozzi/audio_input/audio_input.ino

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+/**
+ * Mozzi Input example: we get the input from a generator and
+ * output the audio via i2s again. In this example we use the 
+ * default value range of 0-1023 for the getAudioInput() method.
+ * However usually it is easier to define the desired range in
+ * the Mozzi configuration object: e.g. cfg.input_range_from = -244;
+ * cfg.input_range_to = 243;
+ */
+#include "AudioTools.h"
+#include "AudioTools/AudioLibs/AudioBoardStream.h"
+#include "AudioTools/AudioLibs/MozziStream.h"
+
+const int sample_rate = 16000;
+AudioInfo info(sample_rate, 1, 16);
+AudioBoardStream i2s(AudioKitEs8388V1);  // final output of decoded stream
+MozziStream mozzi;
+SineWaveGenerator<int16_t> sineWave;                // subclass of SoundGenerator with max amplitude of 32000
+GeneratedSoundStream<int16_t> sound(sineWave);             // Stream generated from sine wave
+
+StreamCopy copier(i2s, mozzi);
+// use: Oscil <table_size, update_rate> oscilName (wavetable), look in .h file
+
+void setup() {
+  Serial.begin(115200);
+  AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Warning);
+
+  // setup mozzi
+  auto cfg = mozzi.defaultConfig();
+  cfg.control_rate = CONTROL_RATE;
+  cfg.copyFrom(info);
+  mozzi.begin(cfg);
+
+  // setup data source for mozzi
+  mozzi.setInput(sound);
+  sineWave.begin(info, N_B4);
+
+  // setup output
+  auto out_cfg = i2s.defaultConfig(RXTX_MODE);
+  out_cfg.copyFrom(info);
+  i2s.begin(out_cfg);
+  i2s.setVolume(1.0);
+}
+
+void updateControl() {}
+
+AudioOutputMozzi updateAudio() {
+  int asig = mozzi.getAudioInput();  // range 0-1023
+  asig = asig - 512;                 // now range is -512 to 511
+  // output range in STANDARD mode is -244 to 243,
+  // so you might need to adjust your signal to suit
+  return asig;
+}
+
+void loop() { copier.copy(); }