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libraries/audio-tools/examples/sandbox/send-hdlc-receive/send-hdlc-receive.ino

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+/**
+ * @file send-hdlc-receive.ino
+ * @author Phil Schatzmann
+ * @brief Sending and receiving audio via Serial. You need to connect the RX pin
+ * with the TX pin!
+ * The sine wave generator is providing the data as fast as possible, therefore we 
+ * throttle on the sending side to prevent that the receiver is getting the data
+ * too fast.  
+ * 
+ * To make sure that we transmit only valid data we use HDLC.
+ *
+ * @version 0.1
+ * @date 2022-03-09
+ *
+ * @copyright Copyright (c) 2022
+ */
+
+#include "AudioTools.h"
+#include "AudioTools/Communication/HDLCStream.h"
+// #include "AudioTools/AudioLibs/AudioBoardStream.h"
+
+AudioInfo info(8000, 1, 16);
+SineWaveGenerator<int16_t> sineWave(32000);
+GeneratedSoundStream<int16_t> sound(sineWave);
+Throttle throttle(sound);
+I2SStream out;
+HDLCStream hdlc_enc(Serial, 256);
+HDLCStream hdlc_dec(Serial, 256);
+StreamCopy copierOut(hdlc_enc, throttle, 256); 
+StreamCopy copierIn(out, hdlc_dec, 256);     
+
+void setup() {
+  Serial2.begin(115200);
+  AudioLogger::instance().begin(Serial2, AudioLogger::Warning);
+  hdlc_enc.begin();
+  hdlc_dec.begin();
+
+  // Note the format for setting a serial port is as follows:
+  // Serial.begin(baud-rate, protocol, RX pin, TX pin);
+  Serial.begin(1000000, SERIAL_8N1);
+
+  // Setup sine wave
+  sineWave.begin(info, N_B4);
+  throttle.begin(info);
+
+  // start I2S
+  Serial.println("starting I2S...");
+  auto config = out.defaultConfig(TX_MODE);
+  config.copyFrom(info);
+  out.begin(config);
+
+  Serial.println("started...");
+}
+
+void loop() {
+  // copy to serial
+  copierOut.copy();
+  // copy from serial
+  copierIn.copy();
+}