Music sequencer based on stm32 blue pill

Modular music CV/Gate sequencer STM32F103C8 (blue pill) written in Rust.

Overview

Keyboard is a custom PCB mounted with Cherry MX keys. It is based on the following schematic:

Pinout

Currently only 2 DACs in use:

STM32 PIN
PA0   COL0 (keypad)
PA1   COL1 (keypad)
PA2   COL2 (keypad)
PA3   COL3 (keypad)
PA4   COL4 (keypad)
PA5   COL5 (keypad)
PA8   ROW0 (keypad)
PA9   ROW1 (keypad)
PA10  ROW2 (keypad)
PB13  DAC1 & DAC2 SPI SCK (MCP4921)
PB15  DAC1 & DAC2 SPI MOSI (MCP4921)
PB12  DAC1 CS (MCP4921)
PB14  DAC2 CS (MCP4921)
PA6   LED data in (WS2812)

Keyboard control

Key	Description
Shift+Fn1	Switch between recording mode: gate or cv
Shift+Fn2	Clear steps
Shift+Forward	Next track
Shift+Back	Previous track
Fn1+Forward	Toggle play/stop
Fn1+Back	Toggle play/pause
Fn1+Step	Select track number
Fn2+Step	Randomize CV or Gate with probability based on the selected step
Forward	Next octave
Back	Previous octave

Development

Getting started

cargo install cargo-embed
rustup target add thumbv7m-none-eabi
cargo embed --release

Debugging

cargo embed