Experimenting with audio synthesis on Teensy 4.0 board

Introduction

This is an experimental code with no particular goal. It does not use Teensy audio library (except for the feeding AudioStream object). The code assumes an I2S audio interface connected to the Teensy4.0 board. I use UDA1334 break-out board from Adafuit (https://www.adafruit.com/product/3678)

Pinout

Check the board info and pinout diagram (https://www.pjrc.com/store/teensy40.html)

Teensy 4.0	UDA1334
pin 7	DIN
pin 20	WSEL
pin 21	BCLK
3V	VIN
GND	GND

Compile

Make sure to have Arduino adn Teensyduino add-on installed (see https://www.pjrc.com/teensy/td_download.html)
Copy build tools to ./tools folder
You'll need to have a make tool to compile the code. On Windows you may use Msys package (https://www.msys2.org/).
Connect Teensy4 board via USB and run:

$ cd src
$ make

This will build the code and program the board. No need to run Arduino IDE.

Playing

Currently the code enabled USB MIDI and Serial interfaces. When board is connected via USB cable you should see Teensy MIDI interface where you can send MIDI commands to. USB virtual serial port is used to print debug info.

Example output

Recorded directly from the audio output.

https://soundcloud.com/arthur-benilov/moszkowski-etincelles-op-36-no-6