Maximilian DSP on the Arduino ESP32 ?

Quite some time ago I have identified Maximilian as interesting tool which can be used to implement synthezisers. Maximilian is a cross-platform and multi-target audio synthesis and signal processing library. So I was wondering if it is possible to use it on Arduino based Microcontrollers.

In the meantime the adapted library is compiling after some slight changes. After that I started to extend my Arduino Audio Tools to provide an nice integration and a first sine test sound generator is working as well.

Arduino Sketch

Here is the example that I have used for my first tests. It is using the AudioKitStream as output. Naturally you can change this to any other supported output stream (e.g. I2SStream).

#include "AudioTools.h"
#include "AudioLibs/MaximilianDSP.h"
#include "AudioLibs/AudioKit.h"

// Define output
AudioKitStream out;
Maximilian maximilian(out);

//This shows how the fundamental building block of digital audio - the sine wave.
maxiOsc mySine;//One oscillator - can be called anything. Can be any of the available waveforms.

void setup() {//some inits
  // setup logging
  Serial.begin(115200);
  AudioLogger::instance().begin(Serial, AudioLogger::Info);
  // setup Aduio output
  auto cfg = out.defaultConfig(TX_MODE);
  out.begin(cfg);
  maximilian.begin(cfg);
}

void play(double *output) {
    output[0]=mySine.sinewave(440);
    output[1]=output[0];
}

// Arduino loop
void loop() {
    maximilian.copy();
}

A complete set of converted examples can be found on Github. However, please note that not all examples have been tested yet…