GooGooMuck

When the sun goes down, and the moon comes up...

I turn into a teenage goo goo muck.

What Is It?

GGM is a software based sound/music synthesizer that runs on the STM32F4 Discovery Board.

The synth and platfom code have been partitioned for ease of portability. The synth code is written using floating point, so a target CPU should have a 32 bit (single precision) FPU. E.g. ARM Cortex M4 or better.

Specifications

• 44100 samples/second (per channel)
• 16 bits/sample
• stereo output
• 32-bit floats for internal operations
• MIDI input (serial)
• 16 voice polyphony
• 16 channels with independent patches

Hardware

• STM32F4Discovery Board (MB997) http://www.st.com/en/evaluation-tools/stm32f4discovery.html
• MIDI to serial breakout board http://ubld.it/products/midi-breakout-board/

Build tools:

• GNU Make
• GNU Embedded Toolchain for ARM
• STLink Device Programming Tool

The path to the GNU cross compilation tools is set in ./mk/common.mk

Source Layout

• common - common souces (target/SoC independent)
• drivers - device drivers (non SoC)
• ggm - GooGooMuck synthesizer (target/SoC independent)
• mk - make scripts
• scripts - python scripts
• soc - SoC drivers and definitions
• target - target specific code
• usb - tinyusb stack (ported to the STM32F4, work in progress)

Inspirations

• https://www.quinapalus.com/goom.html
• https://github.com/MrBlueXav/Dekrispator_v2
• https://github.com/hotchk155/Voici-Le-Strum

Resources

• http://www.earlevel.com/main/
• http://www.musicdsp.com/
• https://www.dsprelated.com/
• https://www.soundonsound.com/techniques/synth-secrets