Working with PlatformIO

The library has been developed to be used in Arduino, but it can also be used easily in PlatformIO.

1. Create a new PlatformIO Project.

2. Update the platformio.ini file in the root of the project:

[platformio]
description = Audio Example
default_envs = esp32dev

[env:esp32dev]
platform = espressif32
board = esp32dev
framework = arduino
lib_deps = https://github.com/pschatzmann/arduino-audio-tools
build_flags = -DCORE_DEBUG_LEVEL=5 -Wno-unused-variable -Wno-unused-but-set-variable -Wno-unused-function -Wno-format-extra-args 
monitor_speed = 115200

Please note that you might need to add additional dependencies e.g. ```lib_deps = https://github.com/pschatzmann/arduino-audio-tools, https://github.com/pschatzmann/arduino-libhelix, https://github.com/greiman/SdFat

3. Add your desired Arduino sketch into the __src directory__ e.g.

#include <Arduino.h> #include "AudioTools.h"

using namespace audio_tools;

typedef int16_t sound_t; // sound will be represented as int16_t (with 2 bytes) uint16_t sample_rate=44100; uint8_t channels = 2; // The stream will have 2 channels SineWaveGenerator<sound_t> sineWave(32000); // subclass of SoundGenerator with max amplitude of 32000 GeneratedSoundStream<sound_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);

// start the bluetooth Serial.println("starting I2S..."); I2SConfig config = out.defaultConfig(TX_MODE); config.sample_rate = sample_rate; config.channels = channels; config.bits_per_sample = 16; out.begin(config);

// Setup sine wave sineWave.begin(channels, sample_rate, N_B4); }

// Arduino loop - copy sound to out void loop() { copier.copy(); }

The file name  does not matter but is should have a __cpp__ or __ino__ extension - you could use e.g. simple.ino or main.cpp. You could also take e.g. any sketch from the samples directory.

4. Compile the project

This step also automatically installs the ESP32-A2DP project into the __.pio/libdeps/esp32dev/ESP32-A2DP/__ directory.

5. Upload the binary

6. Open a new Platformio Terminal and confirm that you get log messages.

7. Make adjustments
- You can extend the sketch with your own logic
- You could replace the sketch with any other example that can be found in __.pio/libdeps/esp32dev/ESP32-A2DP/examples__
- After you confirmed that everything is working you should consider to lower the debug level in platformio.ini because a high log level might impact the sound quality!

### Final Comments
I was using the lib_deps functionality. As an alternative you could remove the ```lib_deps = https://github.com/pschatzmann/arduino-audio-tools``` and do a git clone ```https://github.com/pschatzmann/arduino-audio-tools``` into the __lib folder__