ec43c694a1
From on-board feedback (works well; minor tweaks):
- Pad grid uses circles now: big circle on each beat (division), small on the
subdivisions (vectorio.Circle — native, no extra cost), coloured/lit as before.
- Lane labels use a new small font (font_s.bin, ~12px via gen_font.py) so they're
half-size and show more of the voice name (e.g. 'hatClos').
- LED was blinding -> LED_BRIGHTNESS scale (default 0.15) applied on every write.
- Residual tearing -> SPI back to 62.5 MHz (vendor speed; smaller tear window on a
panel with no tearing-effect pin). Both are CONFIG flags.
Verified by rendering the full scene headless. font_s.bin added to gen_font.py + bundle.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
59 lines
3.4 KiB
Markdown
59 lines
3.4 KiB
Markdown
# PM_K‑1 "Kit" — CircuitPython edition (USB drive + editor)
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The **CircuitPython** firmware for the 52Pi EP‑0172 Pico kit. Unlike the MicroPython version
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(`../pico/main.py`), this makes the Pico mount as a **USB drive (`CIRCUITPY`)** that carries the
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firmware and your tracks — so you can edit on the web and reprogram it without Thonny. It runs the
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same program‑string language as <https://metronome.varasys.io>.
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> **Status: experimental, phase 1.** This drives the screen/touch/joystick/buzzer and reads your
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> grooves from `programs.json`. The editor's one‑click "Save to device" and USB‑MIDI audio‑to‑computer
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> are landing in later phases. The simpler **MicroPython** firmware (`../pico/main.py`) remains the
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> rock‑solid fallback — and the Pico can't be bricked (BOOTSEL → drag a MicroPython `.uf2` back).
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## Install
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1. **Flash CircuitPython:** hold **BOOTSEL**, plug in, and drop the CircuitPython `.uf2` for your board
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onto the `RPI‑RP2` drive (<https://circuitpython.org/board/raspberry_pi_pico/> — or the Pico 2 / W
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build). It reboots and a **`CIRCUITPY`** drive appears.
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2. **Copy everything from the bundle** onto `CIRCUITPY` (drag‑and‑drop — it's a normal drive now):
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- `code.py` (this firmware — runs on boot)
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- `programs.json` (your grooves)
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- `font_s.bin`, `font_m.bin`, `font_l.bin` (the anti‑aliased fonts — kept as files to save RAM)
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3. It starts immediately. Editing `programs.json` (or re‑saving it from the editor) makes CircuitPython
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**auto‑reload** with the new tracks.
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## Controls (same as the MicroPython build)
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- **Touch:** on‑screen `◀◀ / ▶ / ▶▶` (prev · play/stop · next) and `− / TAP / +`.
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- **Joystick:** up/down = tempo, left/right = previous/next groove.
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- **Button A (GP15)** play/stop · **Button B (GP14)** tap tempo.
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- **RGB LED** flashes each beat; **buzzer** clicks (accent/normal/ghost).
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## programs.json
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```json
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{ "title": "PolyMeter",
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"programs": [ { "name": "Four on the floor", "prog": "t120;kick:4;snare:4=.x.x;hatClosed:4/2" } ] }
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```
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Each `prog` is a program string from the web editor. Add/replace entries and save — the device reloads.
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## Calibration (flip flags at the top of `code.py`)
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- **Red/blue swapped:** flip `MADCTL` between `0x48` (default) and `0x40`.
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- **Colours look negative:** toggle `INVERT_COLORS`.
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- **Taps land wrong:** set `TOUCH_DEBUG = True`, watch the serial output, then set
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`TOUCH_SWAP_XY` / `TOUCH_INVERT_X` / `TOUCH_INVERT_Y`.
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- **Joystick reversed:** toggle `JOY_INVERT_X` / `JOY_INVERT_Y`.
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- **LED too bright / too dim:** change `LED_BRIGHTNESS` (0..1, default 0.15).
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- **Screen tearing:** the SPI panel has no tearing-effect sync; `SPI_BAUD` (default 62.5 MHz) is pushed fast
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to minimise it — lower it only if the display is unstable.
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- **Screen blank / garbled:** the panel lot may differ; drop `SPI_BAUD`, and if it's a 240×320 ILI9341
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instead of the 320×480 ST7796, the init/size need changing (this targets the 320×480 you have).
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- **RGB LED** is driven by the core `neopixel_write` module — no library to install. If it stays dark,
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your CircuitPython build is unusually missing that module (everything else still works).
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If `code.py` ever errors, CircuitPython prints the traceback **on the screen and over USB serial** —
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copy that to me and I'll fix it.
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The fonts are the same baked anti‑aliased blobs as the MicroPython build (see `../pico/gen_font.py`).
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