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docs: Stage 3 milestone 3 (live metronome) + notation views

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Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Me Here 2026-06-01 00:20:43 -05:00
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docs/rust-port.md
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@ -90,10 +90,21 @@ session** (`NoCs`) — mipidsi toggles CS mid-command and the ST7796 needs it co
pm-ui to PNG; `--bin panelsim` decodes mipidsi's real command/pixel stream into a PNG (proved the
protocol correct → bug was physical); `--bin initdump` dumps the init + CASET/RASET sequence.
**Next:** real metronome UI in `pm-ui` (iterate in the simulator/emulator, no bench), then inputs
(buttons GP15/14, joystick GP26/27, GT911 touch on GP8/9), audio (piezo GP13), WS2812 (GP12),
USB-MIDI — then link `pm-core` (the track codec + scheduler, already `no_std` and tested).
HAL stays `rp235x-hal` for now (embassy can come later if async buys us enough).
**🟡 Milestone 3 (live metronome) — built, pending on-device check:** the firmware is now an actual
metronome. `embedded-alloc` heap → parses tracks with `track-format` on-device; 4 built-in grooves;
Timer-driven clock; **audio clicks** on the master lane's hits (GP13 PWM, short edge-triggered
pulses, accent louder); **controls** — A = play/stop, B = grid/notation view, joystick (rotated 90°
CCW) up/down = tempo, left/right = groove. Renders `pm-ui::draw_metronome` / `draw_notation`, with a
cheap `draw_progress` strip animating the bar position every frame (full redraw only on change → no
flicker). All loop input reads use `unwrap_or` (no panics) — addresses the self-test crash.
Compile + simulator verified; **needs a flash to confirm** audio timing, joystick directions, no crash.
**pm-ui views (sim-verified, PNGs):** metronome grid (accents/ghosts/polymeter), and **drum notation**
(5-line staff, time sig, hands stem-up / feet stem-down, shared stems, beamed eighths, ledger lines).
**Still to do:** GT911 touch (GP8/9), WS2812 RGB (GP12), USB-MIDI, set-lists from programs.json,
per-cell live playhead, the rest of the practice features. Then split `pm-core` out as its own crate
and add `pm-explorer`/`pm-grid` binaries. HAL stays `rp235x-hal` (embassy later if async earns it).
On `embassy` / `rp-hal`:
- ST7789 240×320 display → `mipidsi` + `embedded-graphics` (mature; the parts are well-supported).