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Development

Rust version

The firmware of this project fits really tight into the flash of Daisy Patch SM. With anything newer than Rust 1.63.0, it just won't fit. Before working with this project, please make sure to install needed Rust toolchains:

rustup toolchain install 1.63.0-x86_64-unknown-linux-gnu
rustup target add thumbv7em-none-eabihf --toolchain 1.63.0
cargo +1.63.0 install cargo-binutils
rustup +1.63.0 component add llvm-tools-preview

Cheat sheet

Run formatting, linter and unit tests:

make

Check firmware size:

cargo size -- -m
cargo size -- -A
cargo bloat --release -n 50

Analyze the call stack:

cargo +nightly call-stack --bin achordion-eurorack > cg.dot
dot -Tsvg cg.dot > cg.svg
firefox cg.svg

Flash using ST-Link:

cd eurorack
openocd &
cargo run --release

Flash using DFU:

make flash

Benchmark:

cargo bench --bench bench

Profiling:

rm -f target/release/deps/bench-*
rm -f callgrind.out.*
RUSTFLAGS="-g" cargo bench --bench bench --no-run
BENCH=$(find target/release/deps -type f -executable -name 'bench-*')
TEST=instrument
valgrind \
    --tool=callgrind \
    --dump-instr=yes \
    --collect-jumps=yes \
    --simulate-cache=yes \
    ${BENCH} --bench --profile-time 10 ${TEST}
kcachegrind callgrind.out.*

Build the manual. Find built PDFs under manual/user and manual/build:

make manual

And more under hack/ and in the Makefile.

Gerbers, BOM and CPL

I extensivelly use https://github.com/Bouni/kicad-jlcpcb-tools to deal with the matters listed in the title, and to prepare project for manufacture.

Bandlimiting algorithm

Bandlimiting is available with two different filtering algorithms - fast fourier transform (FFT) removing high frequency bins and state variable filter (SVF). While FFT provides crips clean and very sharp sound, SVF goes little harder on filtering and leaves slighly more muted, but warmer sound. Preferred algorithm can be selected through a feature in Cargo.toml of both Eurorack and Pure Data modules.