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UI for 120Pedal A temporary repository to experiment with building a TUI for 120Pedal from ratatui
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  • Rust 64.7%
  • C 29.7%
  • Python 5.4%
  • Makefile 0.2%
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120Pedal 🎸🧠

A guitar pedal system running on a Raspberry Pi, controlled through a terminal UI.

  • Language: Rust
  • UI: ratatui terminal interface
  • Audio: ALSA / cpAL
  • Platform: Raspberry Pi 5 with Touch Display 2

Quick start

cargo build
cargo run

See SPEC.md for architecture details, 120Pedal.md for the work log.

Display setup (RPi 5 + Touch Display 2)

If the display output is portrait and needs rotation, add this to /boot/firmware/config.txt:

dtoverlay=vc4-kms-dsi-ili9881-7inch,rotation=270,dsi0=1

Full setup guide in notes/display-rotation/SUMMARY.md.

Running on the Pi (puppy@120pedal.local)

The Pi runs the TUI on its physical console (tty2), not inside a desktop or tmux session. This gives direct framebuffer access for the ratatui interface and evdev touch input.

Deploy & launch

# 1. Build release binary (on the dev machine — same aarch64 arch)
cargo build --release
# 2. Copy to the Pi
rsync -vz target/release/pedal-120 puppy:/home/puppy/120Pedal/pedal-120
# 3. Launch on the physical display (tty2)
ssh puppy \
 'sudo openvt -c 2 -s -f -- /home/puppy/120Pedal/pedal-120'

Touch coordinate mapping

By default the Pi uses Rotated mapping — the kernel handles the 270° rotation of the Touch Display 2. If touch coordinates are wrong, switch to Native mapping (software rotation):

ssh puppy \
 'sudo env PEDAL_TOUCH_MAPPING=native openvt -c 2 -s -f -- /home/puppy/120Pedal/pedal-120'

Hot-reload after a rebuild

# Kill the old instance, rebuild, copy, launch — all in one
ssh puppy 'sudo pkill -f pedal-120 || true' && \
 cargo build --release && \
 rsync -vz target/release/pedal-120 puppy:/home/puppy/120Pedal/pedal-120 && \
 ssh puppy 'sudo openvt -c 2 -s -f -- /home/puppy/120Pedal/pedal-120'

Debugging

  • View the display remotely: ssh puppy 'sudo chvt 2' then sudo chvt 1 to return
  • Check logs: ssh puppy 'sudo journalctl -u pedal-120' (if running as a service)
  • Framebuffer screenshot: ssh puppy 'sudo fbcat /dev/fb0 > /tmp/fb.raw' then transfer and convert on the dev machine
  • Touch device detection: the app logs to stderr (visible if launched without openvt via ssh -t puppy ~/120Pedal/pedal-120)

Requirements on the Pi

  • Raspberry Pi 5 running Debian Trixie (aarch64)
  • Touch Display 2 with dtoverlay=vc4-kms-dsi-ili9881-7inch,rotation=270,dsi0=1 in /boot/firmware/config.txt
  • GPM disabled — GPM translates absolute touch to relative mouse events which breaks evdev touch input: 
    ssh puppy 'sudo systemctl stop gpm && sudo systemctl disable gpm'
  • User puppy with sudo rights and the binary at ~/120Pedal/pedal-120

Key bindings

Key Action
q Quit

Touch on a volume slider → select and drag to adjust.