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libraries/audio-tools/examples/examples-custom-boards/esp32-audio-dev-mini/esp32-audio-dev-mini.ino

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+/**
+ * @file AudioMini.ino
+ * See https://github.com/sonocotta/esp32-audio-development-kit
+ * @author Phil Schatzmann
+ * @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);
+  config.copyFrom(info); 
+  // Custom I2S output pins
+  config.pin_bck = 26;
+  config.pin_ws = 25;
+  config.pin_data = 22;
+  out.begin(config);
+
+  // Setup sine wave
+  sineWave.begin(info, N_B4);
+  Serial.println("started...");
+}
+
+// Arduino loop - copy sound to out 
+void loop() {
+  copier.copy();
+}