64 lines
1.8 KiB
C++
64 lines
1.8 KiB
C++
/**
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* @file send-adpcm-receive.ino
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* @author Phil Schatzmann
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* @brief Sending and receiving audio via Serial. You need to connect the RX pin
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* with the TX pin!
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*
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* We send encoded ADPCM audio over the serial wire: The higher the transmission rate
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* the higher the risk of data loss!
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*
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* @version 0.1
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* @date 2023-11-25
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*
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* @copyright Copyright (c) 2022
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*/
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#include "AudioTools.h"
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#include "AudioTools/AudioCodecs/CodecADPCM.h" // https://github.com/pschatzmann/adpcm
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//#include "AudioTools/AudioLibs/AudioBoardStream.h"
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AudioInfo info(22000, 1, 16);
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I2SStream out; // or AnalogAudioStream, AudioBoardStream etc
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SineWaveGenerator<int16_t> sineWave(32000);
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GeneratedSoundStream<int16_t> sound(sineWave);
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auto &serial = Serial2;
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ADPCMEncoder enc(AV_CODEC_ID_ADPCM_IMA_WAV);
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ADPCMDecoder dec(AV_CODEC_ID_ADPCM_IMA_WAV);
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EncodedAudioStream enc_stream(&serial, &enc);
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EncodedAudioStream dec_stream(&out, &dec);
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Throttle throttle(enc_stream);
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static int frame_size = 498;
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StreamCopy copierOut(throttle, sound, frame_size); // copies sound into Serial
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StreamCopy copierIn(dec_stream, serial, frame_size); // copies sound from Serial
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void setup() {
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Serial.begin(115200);
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AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Warning);
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// Note the format for setting a serial port is as follows:
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// Serial.begin(baud-rate, protocol, RX pin, TX pin);
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Serial2.begin(115200, SERIAL_8N1);
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sineWave.begin(info, N_B4);
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throttle.begin(info);
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enc_stream.begin(info);
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dec_stream.begin(info);
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// start I2S
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auto config = out.defaultConfig(TX_MODE);
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config.copyFrom(info);
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out.begin(config);
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// better visibility in logging
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copierOut.setLogName("out");
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copierIn.setLogName("in");
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}
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void loop() {
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// copy to serial
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copierOut.copy();
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// copy from serial
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copierIn.copy();
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} |