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libraries/audio-tools/examples/examples-stream/streams-generator-r2r/streams-generator-r2r.ino

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+/**
+ * @file streams-generator-r2r.ino
+ * @author Phil Schatzmann
+ * @brief Example for a self built resistor ladder DAC 
+ * @copyright GPLv3
+ */
+ 
+#include "AudioTools.h"
+#include "AudioTools/AudioLibs/R2ROutput.h"
+
+AudioInfo info(8000, 1, 16);
+SineWaveGenerator<int16_t> sineWave;                       // subclass of SoundGenerator with max amplitude of 32000
+GeneratedSoundStream<int16_t> sound(sineWave);             // Stream generated from sine wave
+R2ROutput out; 
+StreamCopy copier(out, sound);                             // copies sound into i2s
+const int pins1[] = {12,14,27,26,25,33,32, 35};            // ESP32 pins
+
+// Arduino Setup
+void setup(void) {  
+  // Open Serial 
+  Serial.begin(115200);
+  while(!Serial);
+  AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Info);
+
+  // start I2S
+  Serial.println("starting R2R...");
+  auto config = out.defaultConfig();
+  config.copyFrom(info); 
+  // 8 pins for 8 bit DAC for channel 1
+  config.channel1_pins = pins1;
+  // channel 2 would be config.channel2_pins
+  out.begin(config);
+
+  // Setup sine wave
+  sineWave.begin(info, N_B4);
+  Serial.println("started...");
+}
+
+// Arduino loop - copy sound to out 
+void loop() {
+  copier.copy();
+}