STM32 Digital Synthesizer (Virtual Analog Sound Source)

Digital synthesizer project with STM32.

The purpose of this project is to make a sound just by creating a simple synthesizer controller.
The USB-MIDI standard or MIDI Data format over SPI allows to utilize existing equipment and knowledge.
Hopefully there will be lots of innovative UI ideas for music.
A binary file is prepared for the controller designer, so download it and write with STM32CubeProg etc.

Development environment

• STM32G431CBU6 (Double-row pin type)
• I2S Sound Module. for example this

Basic features

• Designed to be operated from the outside via SPI or USB.
• General-MIDI(GM) data format.
• 16ch (GM 128 Instruments, 47 Drum Sounds(10ch)).
• Create custom instruments setting. ((Sine, Saw, SQU) x2 /Channel)
• ADSR.
• Pitch bend.
• Filter that can manipulate the cutoff frequency and Q value.
• LFO(Tremolo, Vibrato, WOW).
• Reverb.
• Pan.
• I2S Stereo output.

Future features

• What you want.

Known issue(s)

• XXXX

Demo

• Introduction of each function
• Accordion - Projects using this synthesizer
• Rhythm Machine - Projects using this synthesizer
• Old Version
  • Waveform creation, low-pass filter demo
  • SPI control demo
  • Auto performance (Super Mario)
  • Introduction of creating sounds

Hot to use

with USB-MIDI

1. Write the binary and connect your controller with STM32CubeProg.
2. Connect I2S Module and Speaker.
3. Connect PC and STM32 via USB and send MIDI data using MIDI software on PC.
4. Adjust parameters, experiment, and play MIDI files. PC Control App for Google Chrome.

with MIDI over SPI

underconstration

Signal	STM32
MOSI	PA7
MISO	PA6
SCK	PA5
NSS	PA4

I2S Connection

Signal	STM32	I2S Module
SD	PB15	DIN
BCLK	PB13	BCLK
WS(LRC)	PB12	WS

How to edit this project with STM32CubeIDE

Create a STM32 project with .ioc

Please add the following directories and files using STM32CubeMX etc.

• Driver/CMSIS/
• Driver/CMSIS-DSP/
• Driver/STM32XXxx_HAL_Driver/

More information will be added.