streams-generator_sinfromtable-audiokit.ino

Author: pschatzmann

examples/examples-audiokit/streams-generator_sinfromtable-audiokit/streams-generator_sinfromtable-audiokit.ino

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+/**
+ * @file streams-generator_sinfromtable-audiokit.ino
+ * @brief Tesing SineFromTable with output on audiokit
+ * @author Phil Schatzmann
+ * @copyright GPLv3
+ */
+ 
+#include "AudioTools.h"
+#include "AudioLibs/AudioKit.h"
+
+uint16_t sample_rate=32000;
+uint8_t channels = 2;                                      // The stream will have 2 channels 
+SineFromTable<int16_t> sineWave(32000);                // subclass of SoundGenerator with max amplitude of 32000
+GeneratedSoundStream<int16_t> sound(sineWave);             // Stream generated from sine wave
+AudioKitStream out; 
+//CsvStream<int16_t> out(Serial);
+int sound_len=1024;
+StreamCopy copier(out, sound, sound_len);                             // copies sound into i2s
+int freq = 122;
+
+// Arduino Setup
+void setup(void) {  
+  // Open Serial 
+  Serial.begin(115200);
+  AudioLogger::instance().begin(Serial, AudioLogger::Warning);
+
+  // start I2S
+  Serial.println("starting I2S...");
+  auto config = out.defaultConfig(); //TX_MODE
+  config.sample_rate = sample_rate; 
+  config.channels = channels;
+  config.bits_per_sample = 16;
+  out.begin(config);
+
+  // Setup sine wave
+  auto cfg = sineWave.defaultConfig();
+  cfg.channels = channels;
+  cfg.sample_rate = sample_rate;
+  sineWave.begin(cfg, N_B4);
+  Serial.println("started...");
+}
+
+// Arduino loop - copy sound to out 
+void loop() {
+  copier.copy();
+  // increase frequency
+  freq += 10;
+  if (freq>=10000){
+    freq = 20;
+  }
+  sineWave.setFrequency(freq);
+}