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PM_K-1: one-click A/B firmware updates over USB-MIDI (+ version check)

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Split the CircuitPython firmware into a tiny stable loader (code.py) + the application (app.py,
carries APP_VERSION). The editor's ⋯ → "⬆ Update firmware" queries the device version (SysEx 0x02
-> 0x03 reply), fetches the latest app from the site (/pico-cp-app.py), shows device-vs-latest, and
pushes the new app.py over USB-MIDI (SysEx 0x20). The device installs it to a trial slot (old build
kept as app.bak), reboots, and the loader AUTO-ROLLS-BACK to app.bak if the new build fails to start;
a build that runs cleanly ~5s is confirmed (clears /trial). No BOOTSEL, no dragging; Chromium/Firefox.
app.py forced to pure ASCII so it pushes raw (no base64); SysEx buffer raised to 60KB.

build.sh/deploy.sh: bundle code.py+app.py and serve /pico-cp-app.py. Docs updated.

Verified in CPython: version reply, update install+reboot+ACK, rollback file dance; editor loads clean
with the updater wired.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
Me Here 2026-05-29 06:55:58 -05:00
parent 72ea70da59
commit e8945ee1d1
10 changed files with 720 additions and 628 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
README.md
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@ -192,7 +192,9 @@ flashing steps. Firmware lives in **`pico/`**:
set lists **pushed from the editor over USB‑MIDI** (with a universal download‑and‑drag fallback), and
plays **out your computer's speakers over USB‑MIDI** (the editor's **🎹 Device audio**). By default the
firmware owns the drive (read‑only to the computer, so it's protected); hold **button A** at power‑on for
editor mode (drive writable). The MicroPython build stays the simple, no‑computer option.
editor mode (drive writable). **Firmware updates are one click** from the editor (⋯ → Update firmware) —
pushed over USB‑MIDI as an A/B update with automatic rollback. The MicroPython build stays the simple,
no‑computer option.
## Keyboard shortcuts

4
build.sh
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@ -37,9 +37,11 @@ pathlib.Path("dist/embed.js").write_text(pathlib.Path("embed.js").read_text())
print("copied embed.js")
pathlib.Path("dist/pico-main.py").write_text(pathlib.Path("pico/main.py").read_text()) # PM_K-1 firmware, downloadable
print("copied pico-main.py")
pathlib.Path("dist/pico-cp-app.py").write_text(pathlib.Path("pico-cp/app.py").read_text()) # served for the editor's A/B firmware updater
print("copied pico-cp-app.py")
import zipfile # PM_K-1 CircuitPython drive bundle (download → unzip onto CIRCUITPY)
with zipfile.ZipFile("dist/pm_k1_circuitpy.zip", "w", zipfile.ZIP_DEFLATED) as z:
for f in ("code.py", "boot.py", "programs.json", "font_s.bin", "font_m.bin", "font_l.bin",
for f in ("code.py", "app.py", "boot.py", "programs.json", "font_s.bin", "font_m.bin", "font_l.bin",
"README.md", "protect-firmware.sh"):
z.write("pico-cp/" + f, f)
z.write("dist/editor.html", "editor.html") # offline copy of the editor, on the drive

1
deploy.sh
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@ -49,6 +49,7 @@ done
cp "$DIST_DIR/embed.js" "$DEST_DIR/embed.js"; echo " embed.js ($(stat -c '%s' "$DEST_DIR/embed.js") bytes)"
cp "$DIST_DIR/pico-main.py" "$DEST_DIR/pico-main.py"; echo " pico-main.py ($(stat -c '%s' "$DEST_DIR/pico-main.py") bytes)" # PM_K-1 firmware download
cp "$DIST_DIR/pm_k1_circuitpy.zip" "$DEST_DIR/pm_k1_circuitpy.zip"; echo " pm_k1_circuitpy.zip ($(stat -c '%s' "$DEST_DIR/pm_k1_circuitpy.zip") bytes)" # PM_K-1 CircuitPython bundle
cp "$DIST_DIR/pico-cp-app.py" "$DEST_DIR/pico-cp-app.py"; echo " pico-cp-app.py ($(stat -c '%s' "$DEST_DIR/pico-cp-app.py") bytes)" # PM_K-1 firmware for the editor's A/B updater
rm -f "$DEST_DIR/player-asbuilt.html" # renamed to teacher.html
rm -f "$DEST_DIR/concepts.html" # Concepts is now the landing (/)
# info-*.html are first-class pages again: each form factor has a lean widget page

36
editor.html
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@ -349,6 +349,7 @@
<input type="file" id="importFile" accept="application/json" style="display:none">
<button id="saveDeviceBtn" title="Write this set list to a PM_K-1 device drive (programs.json)">📟 Save to device</button>
<button id="loadDeviceBtn" title="Load a device's programs.json into a new set list">📥 Load from device</button>
<button id="updateFwBtn" title="Check &amp; update the PM_K-1 firmware over USB-MIDI (A/B with auto-rollback)">⬆ Update firmware…</button>
<button id="clearLogBtn">🗑 Clear log</button>
<button id="resetAllBtn" style="color:#ff7b6b">♻ Reset everything…</button>
</div>
@ -1128,7 +1129,7 @@ async function loadFromDevice() {
/* Device audio (Phase 3): a connected PM_K-1 sends a USB-MIDI note per click; we voice it through
this page's synth, so the device drives sound out the computer's speakers, locked to its clock. */
let _midiAccess = null, _midiOn = false, _midiFlash = 0, _midiBeat = 0, _saveCb = null;
let _midiAccess = null, _midiOn = false, _midiFlash = 0, _midiBeat = 0, _saveCb = null, _verCb = null;
function _midiInputs() { return _midiAccess ? [..._midiAccess.inputs.values()] : []; }
function _midiOutputs() { return _midiAccess ? [..._midiAccess.outputs.values()] : []; }
function _send(bytes) { for (const o of _midiOutputs()) { try { o.send(bytes); } catch (_) {} } }
@ -1145,8 +1146,10 @@ async function _ensureMidi() { // MIDI access WITH SysEx (needed to send/
function _wireMidi() { for (const inp of _midiInputs()) inp.onmidimessage = onDeviceMidi; updateMidiBtn(); }
function onDeviceMidi(e) {
const d = e.data; if (!d) return;
if (d[0] === 0xF0 && d[1] === 0x7D) { // our SysEx reply to a program push
if (_saveCb) { const cb = _saveCb; _saveCb = null; cb(d[2] === 0x7F); } // 0x7F ACK / 0x7E NAK
if (d[0] === 0xF0 && d[1] === 0x7D) { // our SysEx reply
const cmd = d[2];
if (cmd === 0x03 && _verCb) { const cb = _verCb; _verCb = null; cb(String.fromCharCode(...d.slice(3, d.length - 1))); } // version
else if ((cmd === 0x7F || cmd === 0x7E) && _saveCb) { const cb = _saveCb; _saveCb = null; cb(cmd === 0x7F); } // ACK/NAK
return;
}
if (_midiOn && (d[0] & 0xf0) === 0x90 && d.length >= 3 && d[2] > 0) { // Note On -> voice it
@ -1179,6 +1182,32 @@ async function toggleDeviceAudio() {
? "Device audio ON.\nMIDI input(s): " + names.join(", ") + "\nPress play on the device — the button pulses green per note."
: "Armed, but no MIDI input yet. Plug in the PM_K-1 (CircuitPython firmware) — it connects automatically.");
}
function _queryDeviceVersion() { // ask the device its firmware version (SysEx 0x02 -> reply 0x03)
return new Promise((res) => { _verCb = res; _send([0xF0, 0x7D, 0x02, 0xF7]); setTimeout(() => { if (_verCb) { _verCb = null; res(null); } }, 1500); });
}
async function updateFirmware() { // A/B firmware update over USB-MIDI, with a version check
if (!(await _ensureMidi()) || !_midiOutputs().length)
return alert("Connect the PM_K-1 (Chrome/Edge/Firefox), then try again.");
const dev = await _queryDeviceVersion();
let src;
try { src = await (await fetch("/pico-cp-app.py", { cache: "no-store" })).text(); }
catch (e) { return alert("Couldn't fetch the latest firmware from the site."); }
const m = src.match(/APP_VERSION\s*=\s*["']([^"']+)["']/); const latest = m && m[1];
if (!latest) return alert("Couldn't read the latest firmware version.");
const upToDate = dev && dev === latest;
if (!confirm("Device firmware: " + (dev || "unknown") + "\nLatest: " + latest +
(upToDate ? "\n\nYou're up to date. Re-install anyway?"
: "\n\nUpdate now? The device reboots, runs the new build, and auto-rolls-back if it fails to start."))) return;
const bytes = [0xF0, 0x7D, 0x20];
for (let i = 0; i < src.length; i++) bytes.push(src.charCodeAt(i) & 0x7F); // app.py is ASCII
bytes.push(0xF7);
const p = new Promise((res) => { _saveCb = res; setTimeout(() => { if (_saveCb) { _saveCb = null; res(null); } }, 5000); });
_send(bytes);
const ok = await p;
alert(ok === true ? "Update sent ✓ — the device is rebooting into the new build (v" + latest + "). It auto-confirms after a few seconds, or rolls back if it won't start."
: ok === false ? "The device is in editor mode (read-only to the updater). Reboot it normally (don't hold A) and try again."
: "No acknowledgement from the device. Make sure it's connected and not in editor mode — or drag app.py onto the drive in editor mode.");
}
// Apply a shared link on load. Returns true if it set the metronome state.
function applyHashShare() {
@ -1405,6 +1434,7 @@ $("importBtn").addEventListener("click", () => { $("trayMenu").hidden = true; $(
$("importFile").addEventListener("change", (e) => { if (e.target.files[0]) importAll(e.target.files[0]); e.target.value = ""; });
$("saveDeviceBtn").addEventListener("click", () => { $("trayMenu").hidden = true; saveToDevice(); });
$("loadDeviceBtn").addEventListener("click", () => { $("trayMenu").hidden = true; loadFromDevice(); });
$("updateFwBtn").addEventListener("click", () => { $("trayMenu").hidden = true; updateFirmware(); });
$("midiBtn").addEventListener("click", toggleDeviceAudio);
$("clearLogBtn").addEventListener("click", () => { $("trayMenu").hidden = true; clearLog(); });
$("resetAllBtn").addEventListener("click", () => { $("trayMenu").hidden = true; resetAll(); });

1
info-kit.html
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@ -152,6 +152,7 @@
<li><b>Play through your computer:</b> click <b>🎹 Device audio</b>, then press play on the device — the full
groove sounds through your speakers over USB‑MIDI, in sync; the screen shows a <b>MIDI</b> badge and the buzzer mutes.</li>
<li><b>Practice log:</b> plays over 5 s appear at the bottom of the screen (time · BPM · duration · track); tap a row twice to delete.</li>
<li><b>Firmware updates:</b> ⋯ menu → <b>⬆ Update firmware</b> — it checks your version, pushes the latest over USB‑MIDI, and the device A/B‑updates with automatic rollback if a build won't boot.</li>
</ol>
</div>
</details>

15
pico-cp/README.md
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@ -23,8 +23,9 @@ from the web editor over USB‑MIDI**, and plays through your **computer's speak
1. **Flash CircuitPython:** hold **BOOTSEL**, plug in, drop the CircuitPython `.uf2` onto `RPI‑RP2`
(<https://circuitpython.org/board/raspberry_pi_pico/> — Pico 2 / W builds also fine). A `CIRCUITPY`
drive appears.
2. **Copy the whole bundle** onto `CIRCUITPY`: `boot.py`, `code.py`, `programs.json`,
`font_s.bin` / `font_m.bin` / `font_l.bin`, `editor.html` (offline editor), and the helper scripts.
2. **Copy the whole bundle** onto `CIRCUITPY`: `boot.py`, `code.py` (loader) + `app.py` (the application),
`programs.json`, `font_s.bin` / `font_m.bin` / `font_l.bin`, `editor.html` (offline editor), and the
helper scripts. (`code.py` is a tiny stable loader; `app.py` is what firmware updates replace.)
3. **Power‑cycle** (so `boot.py` takes effect). It boots into appliance mode and runs.
## Program it from the web (push over USB‑MIDI)
@ -36,6 +37,16 @@ acknowledges — the editor shows **Saved ✓**. **📥 Load from device** reads
*Universal fallback (any browser / OS, even Safari):* Save to device **downloads** `programs.json` when no
device answers — boot the Pico in **editor mode** (hold A) and drag the file onto the `CIRCUITPY` drive.
## Firmware updates (one‑click, A/B with auto‑rollback)
`code.py` is a small stable **loader**; the application is `app.py` (it carries `APP_VERSION`). To update:
the editor's ⋯ menu → **⬆ Update firmware…** queries the device's version, fetches the latest from the site,
shows *device vs latest*, and on confirm **pushes the new `app.py` over USB‑MIDI**. The device installs it to
a **trial slot** (keeping the old build as `app.bak`) and reboots; if the new build **doesn't boot, the loader
automatically rolls back** to `app.bak`. A build that runs cleanly for ~5 s is confirmed. No BOOTSEL, no
dragging. (Updating CircuitPython *itself* still uses BOOTSEL + a `.uf2`, but that's rare. And the Pico is
unbrickable as the ultimate backstop.)
## Play through the computer's speakers
The Pico is a USB‑MIDI device and sends a note per click (GM drum note per lane, velocity by accent).

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pico-cp/__pycache__/app.cpython-312.pyc Normal file
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pico-cp/app.py Normal file
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@ -0,0 +1,648 @@
# VARASYS PolyMeter - PM_K-1 "Kit" firmware (CircuitPython edition)
# Raspberry Pi Pico (Pico / Pico W / Pico 2) on the 52Pi EP-0172 "Pico Breadboard Kit Plus":
# 3.5" ST7796 320x480 cap-touch (GT911), PSP joystick, WS2812 RGB, buzzer, 2 buttons.
#
# WHY CIRCUITPYTHON: the board then mounts as a USB drive (CIRCUITPY) carrying this code, your
# tracks (programs.json) and a copy of the editor - edit on the web, "Save to device" writes
# programs.json here, and CircuitPython auto-reloads with the new grooves. It also sends USB-MIDI
# (a note per click) so the web editor can play it out the computer's speakers ("Device audio").
# Runs the SAME program strings as metronome.varasys.io.
#
# INSTALL: flash CircuitPython (https://circuitpython.org/board/raspberry_pi_pico/), then copy
# this file as code.py plus programs.json onto the CIRCUITPY drive. It runs on boot.
#
# Fallback: the simpler MicroPython firmware (pico/main.py) is always available - BOOTSEL +
# drag a MicroPython .uf2 to go back. The Pico cannot be bricked.
#
# Untested-panel notes & calibration flags are in CONFIG + pico-cp/README.md.
import board, busio, digitalio, analogio, pwmio, displayio, vectorio, time, json, gc, os, supervisor
supervisor.runtime.autoreload = False # we write our own files (log + pushed programs); never self-restart
APP_VERSION = "1.0.0" # firmware version (the A/B updater pushes/compares this)
try:
import rtc # set from the editor's clock SysEx so the log has real timestamps
except ImportError:
rtc = None
try: # CircuitPython 9.x
from fourwire import FourWire
from busdisplay import BusDisplay
except ImportError: # CircuitPython 8.x
from displayio import FourWire
from displayio import Display as BusDisplay
try:
import neopixel_write # core module on RP2040 - drives WS2812 with no external library
except ImportError:
neopixel_write = None
try:
import usb_midi # default-enabled on RP2040 - sends a MIDI note per click to the computer
except ImportError:
usb_midi = None
# ============================== CONFIG (tweak if needed) ==============================
SPI_BAUD = 62_500_000 # faster SPI = smaller tearing window; drop to 40_000_000 if unstable
LED_BRIGHTNESS = 0.15 # WS2812 sits right next to you - keep it dim (0..1)
MIDI_ENABLED = True # send a USB-MIDI note per click (play via the web editor's "Device audio")
MUTE_BUZZER = False # silence the on-board buzzer (e.g. when using computer audio)
WIDTH, HEIGHT = 320, 480
MADCTL = 0x48 # portrait; 0x48 swaps R/B for this BGR panel (cyan reads cyan). Use 0x40 if reversed.
INVERT_COLORS = True # most ST7796 modules need inversion ON; set False if colours look negative
# Touch (GT911) - flip if taps land wrong:
TOUCH_SWAP_XY = False
TOUCH_INVERT_X = False
TOUCH_INVERT_Y = False
TOUCH_DEBUG = False
# Joystick:
JOY_INVERT_X = False
JOY_INVERT_Y = False
JOY_DEADZONE = 9000
# ----- pins (fixed by the EP-0172 board) -----
P_SCK, P_MOSI, P_CS, P_DC, P_RST = board.GP2, board.GP3, board.GP5, board.GP6, board.GP7
P_SDA, P_SCL = board.GP8, board.GP9
P_RGB, P_BUZ, P_BTNA, P_BTNB = board.GP12, board.GP13, board.GP15, board.GP14
P_JOYX, P_JOYY = board.GP26, board.GP27
# ----- baked default grooves (used only if programs.json is missing/bad) -----
DEFAULT_PROGRAMS = [
("Four on the floor", "t120;kick:4;snare:4=.x.x;hatClosed:4/2"),
("Swing ride", "t150;ride:4/2s;kick:4=X..x;snare:4=.x.x"),
("7/8 (2+2+3)", "t130;kick:2+2+3=x..x..x;hatClosed:2+2+3/2"),
("5 over 4", "t100;kick:4;claves:5~"),
("Straight click", "t120;beep:4"),
]
# ============================== COLOURS (0xRRGGBB; displayio handles 565) ==============================
C_BG, C_PANEL, C_TXT, C_MUTE = 0x06090E, 0x1C222C, 0xC7D0DB, 0x788494
C_CYAN, C_AMBER, C_GREEN, C_DIM = 0x0AB3F7, 0xFF9B2E, 0x2FE07A, 0x243240
C_BTN = 0x1C222C
LEVEL_RGB = {2: (255, 110, 0), 1: (0, 150, 255), 3: (130, 70, 255)}
# voice -> General-MIDI note (USB-MIDI bridge), and level -> MIDI velocity
SOUND_GM = {"kick":36,"kick808":36,"kick909":36, "snare":38,"snare808":38,"snare909":38,
"clap":39,"clap808":39,"clap909":39, "rim":37, "hatClosed":42,"hat808":42,"hat909":42,
"hatOpen":46,"openHat808":46, "ride":51,"ride909":51, "crash":49,"crash909":49,
"tomLow":41,"tom808":45,"tomMid":45,"tomHigh":48, "tambourine":54,
"cowbell":56,"cowbell808":56, "woodblock":76,"jamblock":76, "claves":75, "beep":37}
GM_DEFAULT = 37
MIDI_VEL = {2: 120, 1: 90, 3: 45} # accent / normal / ghost
MAXLANES = 5 # lanes shown on the pad grid (extras still play)
LOG_TOP, LOG_ROWH, LOG_ROWS = 302, 16, 9 # practice-history log area (below the pad grid)
MIN_LOG_SEC = 5 # don't log plays shorter than this
PAD_DIM = (0x10161E, 0x0A3A52, 0x4A3010, 0x2A1D4A) # idle pad: mute / normal / accent / ghost
PAD_LIT = (0x39414D, 0x0AB3F7, 0xFF9B2E, 0x967BFF) # playhead pad: mute / normal / accent / ghost
# WS2812 RGB LED - self-contained via the core neopixel_write module (no external library)
class RGB:
def __init__(self, pin):
self.ok = neopixel_write is not None
if self.ok:
self.io = digitalio.DigitalInOut(pin); self.io.direction = digitalio.Direction.OUTPUT
self.buf = bytearray(3)
def set(self, r, g, b):
if not self.ok: return
# WS2812 wants GRB order; scale down so it isn't blinding
self.buf[0] = int(g * LED_BRIGHTNESS); self.buf[1] = int(r * LED_BRIGHTNESS); self.buf[2] = int(b * LED_BRIGHTNESS)
try: neopixel_write.neopixel_write(self.io, self.buf)
except Exception: self.ok = False
# ============================== ANTI-ALIASED FONTS (binary blobs on the drive; see pico/gen_font.py) ==============================
def load_font(path):
with open(path, "rb") as f:
blob = f.read()
count = blob[0]; p = 1; pixoff = 1 + count * 7; glyphs = {}
for _ in range(count):
cp = (blob[p] << 8) | blob[p+1]; w = blob[p+2]; h = blob[p+3]
xoff = blob[p+4]; xoff = xoff - 256 if xoff > 127 else xoff
top = blob[p+5]; adv = blob[p+6]; p += 7
glyphs[cp] = (w, h, xoff, top, adv, pixoff); pixoff += (w * h + 1) // 2
return (glyphs, blob)
FONT_S = load_font("/font_s.bin") # small - pad-grid lane labels
FONT_M = load_font("/font_m.bin") # labels / buttons
FONT_L = load_font("/font_l.bin") # big BPM
gc.collect()
def _blend(bg, fg, i):
t = i * 17
r = (((bg >> 16) & 0xFF)*(255-t) + ((fg >> 16) & 0xFF)*t) // 255
g = (((bg >> 8) & 0xFF)*(255-t) + ((fg >> 8) & 0xFF)*t) // 255
b = ((bg & 0xFF)*(255-t) + (fg & 0xFF)*t) // 255
return (r << 16) | (g << 8) | b
def make_text(s, font, fg, bg):
"""Render a string into a displayio TileGrid (anti-aliased via a 16-step blend palette)."""
glyphs, blob = font
w = 0; top0 = 999; bot = 0
for c in s:
g = glyphs.get(ord(c))
if not g: continue
w += g[4]
if g[1]:
if g[3] < top0: top0 = g[3]
if g[3] + g[1] > bot: bot = g[3] + g[1]
if top0 == 999: top0 = 0
w = max(1, w); h = max(1, bot - top0)
gc.collect()
bmp = displayio.Bitmap(w, h, 16)
pal = displayio.Palette(16)
for i in range(16): pal[i] = _blend(bg, fg, i)
pen = 0
for c in s:
g = glyphs.get(ord(c))
if not g: continue
gw, gh, xoff, gtop, adv, off = g
for j in range(gh):
row = (gtop - top0) + j
for i in range(gw):
k = j * gw + i
byte = blob[off + (k >> 1)]
nib = (byte >> 4) if (k & 1) == 0 else (byte & 0xF)
if nib:
x = pen + xoff + i
if 0 <= x < w and 0 <= row < h: bmp[x, row] = nib
pen += adv
return displayio.TileGrid(bmp, pixel_shader=pal), w, h
# ============================== POLYMETER ENGINE (same semantics as the web/MicroPython) ==============================
PAT = {'X': 2, 'x': 1, 'g': 3, '.': 0, '-': 0, '_': 0}
PRIO = {2: 3, 1: 2, 3: 1}
def parse_program(s):
bpm = 120; lanes = []
for tok in s.strip().split(';'):
tok = tok.strip()
if not tok: continue
if tok[0] == 't' and tok[1:].isdigit():
bpm = int(tok[1:]); continue
if ':' not in tok: continue
lane = _parse_lane(tok)
if lane: lanes.append(lane)
if not lanes: lanes = [_parse_lane("beep:4")]
return max(30, min(300, bpm)), lanes
def _parse_lane(tok):
poly = '~' in tok; mute = '!' in tok
tok = tok.replace('~', '').replace('!', '')
if '@' in tok: tok = tok.split('@')[0]
sound, _, rest = tok.partition(':')
pattern = None
if '=' in rest: rest, _, pattern = rest.partition('=')
sub = 1; swing = False
if '/' in rest:
rest, _, sd = rest.partition('/')
swing = sd.endswith('s'); sd = sd.rstrip('s') # "/2s" = swung eighths
sub = int(sd) if sd.isdigit() else 1
groups = [int(g) for g in rest.split('+') if g.isdigit()] or [4]
beats = sum(groups); starts = set(); acc = 0
for gp in groups: starts.add(acc); acc += gp
steps = beats * sub
if pattern:
levels = [PAT.get(ch, 0) for ch in pattern]
if len(levels) < steps: levels += [0] * (steps - len(levels))
steps = len(levels)
else:
levels = []
for i in range(steps):
if i % sub == 0: levels.append(2 if (i // sub) in starts else 1)
else: levels.append(0)
return {'sound': sound, 'sub': sub, 'swing': swing, 'steps': steps, 'levels': levels, 'poly': poly, 'mute': mute}
def load_programs():
try:
with open("/programs.json") as f:
d = json.load(f)
progs = [(p["name"], p["prog"]) for p in d["programs"]]
if progs: return progs
except Exception as e:
print("programs.json:", e)
return DEFAULT_PROGRAMS
# ============================== GT911 TOUCH ==============================
class GT911:
def __init__(self, i2c):
self.i2c = i2c; self.addr = None
while not i2c.try_lock(): pass
try: found = i2c.scan()
finally: i2c.unlock()
for a in (0x5D, 0x14):
if a in found: self.addr = a; break
if self.addr is None and found: self.addr = found[0]
def _rd(self, reg, n):
b = bytearray(n)
while not self.i2c.try_lock(): pass
try:
self.i2c.writeto(self.addr, bytes([reg >> 8, reg & 0xFF]))
self.i2c.readfrom_into(self.addr, b)
finally: self.i2c.unlock()
return b
def _wr(self, reg, val):
while not self.i2c.try_lock(): pass
try: self.i2c.writeto(self.addr, bytes([reg >> 8, reg & 0xFF, val]))
finally: self.i2c.unlock()
def read(self):
if self.addr is None: return None
try: st = self._rd(0x814E, 1)[0]
except OSError: return None
if not (st & 0x80): return None
n = st & 0x0F; pt = None
if n >= 1:
b = self._rd(0x8150, 4); tx = b[0] | (b[1] << 8); ty = b[2] | (b[3] << 8)
pt = self._map(tx, ty)
try: self._wr(0x814E, 0)
except OSError: pass
return pt
def _map(self, tx, ty):
if TOUCH_DEBUG: print("touch raw", tx, ty)
if TOUCH_SWAP_XY: tx, ty = ty, tx
if TOUCH_INVERT_X: tx = WIDTH - 1 - tx
if TOUCH_INVERT_Y: ty = HEIGHT - 1 - ty
if 0 <= tx < WIDTH and 0 <= ty < HEIGHT: return (tx, ty)
return None
# ============================== DISPLAY SETUP ==============================
def st7796_init():
inv = b'\x21\x00' if INVERT_COLORS else b'\x20\x00'
return (
b'\x01\x80\x78' # SWRESET + 120ms
b'\x11\x80\x78' # SLPOUT + 120ms
b'\xF0\x01\xC3' b'\xF0\x01\x96' # command-set unlock
+ bytes([0x36, 0x01, MADCTL]) +
b'\x3A\x01\x55' # 16bpp
b'\xB4\x01\x01'
b'\xB6\x03\x80\x02\x3B'
b'\xE8\x08\x40\x8A\x00\x00\x29\x19\xA5\x33'
b'\xC1\x01\x06' b'\xC2\x01\xA7'
b'\xC5\x81\x18\x78' # VCOM + 120ms
b'\xE0\x0E\xF0\x09\x0B\x06\x04\x15\x2F\x54\x42\x3C\x17\x14\x18\x1B'
b'\xE1\x0E\xE0\x09\x0B\x06\x04\x03\x2B\x43\x42\x3B\x16\x14\x17\x1B'
b'\xF0\x01\x3C' b'\xF0\x81\x69\x78' # lock + 120ms
+ inv +
b'\x29\x80\x32' # DISPON + 50ms
)
def make_display():
displayio.release_displays()
spi = busio.SPI(clock=P_SCK, MOSI=P_MOSI)
bus = FourWire(spi, command=P_DC, chip_select=P_CS, reset=P_RST, baudrate=SPI_BAUD)
return BusDisplay(bus, st7796_init(), width=WIDTH, height=HEIGHT, auto_refresh=False)
def solid(color):
p = displayio.Palette(1); p[0] = color; return p
def rect(x, y, w, h, color):
return vectorio.Rectangle(pixel_shader=solid(color), width=w, height=h, x=x, y=y)
# ============================== APP ==============================
class App:
def __init__(self):
self.display = make_display()
self.i2c = busio.I2C(scl=P_SCL, sda=P_SDA, frequency=400_000)
self.touch = GT911(self.i2c)
self.midi = usb_midi.ports[1] if (MIDI_ENABLED and usb_midi and len(usb_midi.ports) > 1) else None
self.midi_in = usb_midi.ports[0] if (MIDI_ENABLED and usb_midi and len(usb_midi.ports) > 0) else None
self._mbuf = bytearray(64); self.midi_host = False; self.last_midi_in = 0.0
self._sx = bytearray(); self._sxon = False # USB-MIDI SysEx assembler (clock + pushed programs)
self.led = RGB(P_RGB)
self.buz = pwmio.PWMOut(P_BUZ, frequency=1600, variable_frequency=True, duty_cycle=0)
self.buz_off = 0
self.btnA = self._btn(P_BTNA); self.btnB = self._btn(P_BTNB)
self._aPrev = True; self._bPrev = True
self.jx = analogio.AnalogIn(P_JOYX); self.jy = analogio.AnalogIn(P_JOYY)
self._joyNext = 0
self._touchDown = False; self._touchSeen = 0
self.running = False; self.bpm = 120; self.idx = 0; self.lanes = []; self.rgb = (0, 0, 0)
self.programs = load_programs()
self.dirty = True
self.pad_pal = displayio.Palette(8)
for i in range(4): self.pad_pal[i] = PAD_DIM[i]; self.pad_pal[i + 4] = PAD_LIT[i]
self.lane_pads = []; self.lane_lit = []
# practice history - persisted to /history.json (next to programs.json) when we own the filesystem
self.can_write = self._probe_write()
self.log = self._load_log()
self.play_start = None; self.play_bpm = 0; self.play_name = ""
self._armed = None; self.log_rows = []
self._build_scene()
self.load(0)
self.draw_log()
def _btn(self, pin):
d = digitalio.DigitalInOut(pin); d.direction = digitalio.Direction.INPUT; d.pull = digitalio.Pull.UP
return d
# ---------- scene graph ----------
def _build_scene(self):
root = displayio.Group(); self.display.root_group = root
root.append(rect(0, 0, WIDTH, HEIGHT, C_BG))
tg, w, h = make_text("PM_K-1 KIT", FONT_M, C_CYAN, C_BG); tg.x = 12; tg.y = 8; root.append(tg)
root.append(rect(0, 38, WIDTH, 2, C_PANEL))
# dynamic groups
self.g_bpm = displayio.Group(); root.append(self.g_bpm) # big tempo (right)
self.g_run = displayio.Group(); root.append(self.g_run) # RUN / STOP (left)
self.g_name = displayio.Group(); root.append(self.g_name) # item index + name
self.g_midi = displayio.Group(); root.append(self.g_midi) # "MIDI" indicator (top-right) when a host is listening
self.g_grid = displayio.Group(); root.append(self.g_grid) # lanes x step pads
root.append(rect(0, LOG_TOP - 6, WIDTH, 2, C_PANEL)) # divider above the history log
self.g_log = displayio.Group(); root.append(self.g_log) # practice history (tap a row to delete)
# (no on-screen buttons - transport is the joystick + buttons A/B; touch deletes log rows)
def _place(self, group, s, x, y, fg, bg, font, right_edge=None):
while len(group): group.pop()
self.dirty = True
if not s: return
tg, w, h = make_text(s, font, fg, bg)
tg.x = (right_edge - w) if right_edge is not None else x; tg.y = y; group.append(tg)
def _center(self, group, s, cx, cy, fg, bg, font):
while len(group): group.pop()
tg, w, h = make_text(s, font, fg, bg); tg.x = cx - w//2; tg.y = cy - h//2; group.append(tg)
self.dirty = True
# ---------- program ----------
def load(self, i):
n = len(self.programs); self.idx = i % n
self.name, prog = self.programs[self.idx]
self.bpm, self.lanes = parse_program(prog)
self.master = self.lanes[0]
self._reset_clock(); self.draw_bpm(); self.draw_status(); self.build_grid()
def _step_dur(self, L, step):
beat = 60_000_000_000 / self.bpm
if L['poly']: # ~ polymeter: fit this lane's whole cycle into lane 1's bar
m = self.lanes[0]; master_bar = beat * (m['steps'] // m['sub'])
return int(master_bar / L['steps'])
sub = L['sub']
if L['swing'] and sub % 2 == 0: # swing even subdivisions: long-short (2:1) pairs
pair = beat / (sub // 2)
return int(pair * 2 / 3) if (step % sub) % 2 == 0 else int(pair / 3)
return int(beat / sub) # straight: a step = one beat / subdivision
def _reset_clock(self):
now = time.monotonic_ns()
for L in self.lanes:
L['next'] = now; L['step'] = -1
# ---------- audio + light ----------
def click(self, level):
self.buz.frequency = {2: 2300, 1: 1600, 3: 1050}.get(level, 1600)
self.buz.duty_cycle = {2: 42000, 1: 30000, 3: 14000}.get(level, 30000)
self.buz_off = time.monotonic_ns() + 22_000_000
def flash(self, level):
self.rgb = LEVEL_RGB.get(level, (0, 150, 255))
self.led.set(*self.rgb)
def led_off(self):
self.rgb = (0, 0, 0)
self.led.set(0, 0, 0)
def midi_send(self, note, vel): # device-as-conductor: a note per click to the computer
if self.midi is None: return
try: self.midi.write(bytes([0x90, note, vel])) # Note On (percussive - no Note Off needed)
except Exception: pass
# ---------- transport ----------
def toggle(self):
self.running = not self.running
if self.running: self._reset_clock(); self._start_play()
else: self.buz.duty_cycle = 0; self.led_off(); self.reset_playheads(); self._log_play()
self.draw_status()
def set_bpm(self, v):
v = max(30, min(300, v))
if v != self.bpm:
self.bpm = v
self.draw_bpm()
def goto(self, i):
was = self.running
if was: self.running = False; self._log_play() # close out the track that was playing
self.load(i)
if was: self.running = True; self._reset_clock(); self._start_play()
def tap(self):
now = time.monotonic()
if not hasattr(self, '_taps'): self._taps = []
self._taps = [t for t in self._taps if now - t < 2.4]
self._taps.append(now)
if len(self._taps) >= 2:
span = (self._taps[-1] - self._taps[0]) / (len(self._taps) - 1)
if span > 0: self.set_bpm(round(60 / span))
# ---------- scheduler ----------
def tick(self):
now = time.monotonic_ns()
if self.buz_off and now >= self.buz_off: self.buz.duty_cycle = 0; self.buz_off = 0
if self.running:
fired = []
for li, L in enumerate(self.lanes):
adv = False
while now >= L['next']:
L['step'] = (L['step'] + 1) % L['steps']
lvl = 0 if L['mute'] else L['levels'][L['step']]
if lvl > 0:
fired.append(lvl)
self.midi_send(SOUND_GM.get(L['sound'], GM_DEFAULT), MIDI_VEL.get(lvl, 90)) # one note per lane
L['next'] += self._step_dur(L, L['step']); adv = True
if adv and li < len(self.lane_pads): self._move_playhead(li, L['step'])
if fired:
best = max(fired, key=lambda l: PRIO.get(l, 0))
if not MUTE_BUZZER and not self.midi_host: self.click(best) # computer plays it instead
self.flash(best)
if self.rgb != (0, 0, 0):
r, g, b = self.rgb; r = r*7//10; g = g*7//10; b = b*7//10
self.rgb = (r, g, b) if (r+g+b) > 12 else (0, 0, 0)
self.led.set(*self.rgb)
# ---------- inputs ----------
def poll(self):
a = self.btnA.value
if (not a) and self._aPrev: self.toggle()
self._aPrev = a
b = self.btnB.value
if (not b) and self._bPrev: self.tap()
self._bPrev = b
now = time.monotonic_ns()
if now >= self._joyNext:
x = self.jx.value - 32768; y = self.jy.value - 32768
if JOY_INVERT_X: x = -x
if JOY_INVERT_Y: y = -y
if abs(y) > JOY_DEADZONE:
self.set_bpm(self.bpm + (1 if y > 0 else -1) * (5 if abs(y) > 26000 else 1))
self._joyNext = now + 70_000_000
elif abs(x) > JOY_DEADZONE:
self.goto(self.idx + (1 if x > 0 else -1)); self._joyNext = now + 350_000_000; return
else:
self._joyNext = now + 20_000_000
pt = self.touch.read()
nowms = time.monotonic()
if pt:
self._touchSeen = nowms
if not self._touchDown:
self._touchDown = True; self._tap_log(pt[0], pt[1])
elif self._touchDown and (nowms - self._touchSeen) > 0.14:
self._touchDown = False
# USB-MIDI in: any byte = a host is listening (heartbeat); also assemble SysEx (clock / pushed programs)
if self.midi_in is not None:
try: n = self.midi_in.readinto(self._mbuf)
except Exception: n = 0
if n:
self.last_midi_in = nowms
self._feed_midi(self._mbuf, n)
host = bool(self.last_midi_in) and (nowms - self.last_midi_in) < 1.0
if host != self.midi_host:
self.midi_host = host
if host: self.buz.duty_cycle = 0 # silence the buzzer when the computer takes over
self.led_off(); self.draw_midi()
# ---------- drawing ----------
def draw_bpm(self):
self._place(self.g_bpm, str(self.bpm), 0, 44, C_TXT, C_BG, FONT_L, right_edge=WIDTH-12)
def draw_status(self):
self._place(self.g_run, "RUN" if self.running else "STOP", 12, 48,
C_GREEN if self.running else C_MUTE, C_BG, FONT_M)
self._place(self.g_name, "%d/%d %s" % (self.idx+1, len(self.programs), self.name[:18]),
12, 112, C_TXT, C_BG, FONT_M)
def draw_midi(self):
self._place(self.g_midi, "MIDI" if self.midi_host else "", 0, 12, C_GREEN, C_BG, FONT_M, right_edge=WIDTH-12)
# ---------- pad grid (each lane = a row of step pads; playhead lit as it plays) ----------
def _padbase(self, L, s):
return 0 if L['mute'] else L['levels'][s]
def build_grid(self):
while len(self.g_grid): self.g_grid.pop()
self.lane_pads = []; self.lane_lit = []
n = min(len(self.lanes), MAXLANES)
top = 140; rowh = min(40, (296 - top) // max(1, n))
for li in range(n):
L = self.lanes[li]; y = top + li * rowh; cy = y + rowh // 2
tg, w, h = make_text((L.get('sound', '') or '?')[:7], FONT_S, C_MUTE, C_BG)
tg.x = 8; tg.y = cy - h // 2; self.g_grid.append(tg)
steps = L['steps']; sub = L['sub']; px0 = 60
usable = WIDTH - 8 - px0 - 12; stepw = max(1, usable // steps)
r_big = max(2, min(6, stepw // 2, (rowh - 8) // 2)); r_sml = max(2, r_big - 2)
pads = []
for s in range(steps):
rad = r_big if (s % sub == 0) else r_sml # big = beat (division), small = subdivision
cxp = px0 + 6 + (s * usable) // steps # proportional -> beats line up across lanes
c = vectorio.Circle(pixel_shader=self.pad_pal, radius=rad, x=cxp, y=cy)
c.color_index = self._padbase(L, s); self.g_grid.append(c); pads.append(c)
self.lane_pads.append(pads); self.lane_lit.append(-1)
self.dirty = True
def _move_playhead(self, li, step):
pads = self.lane_pads[li]; prev = self.lane_lit[li]
if 0 <= prev < len(pads): pads[prev].color_index = self._padbase(self.lanes[li], prev)
if step < len(pads): pads[step].color_index = self._padbase(self.lanes[li], step) + 4
self.lane_lit[li] = step; self.dirty = True
def reset_playheads(self):
for li, pads in enumerate(self.lane_pads):
prev = self.lane_lit[li]
if 0 <= prev < len(pads): pads[prev].color_index = self._padbase(self.lanes[li], prev)
self.lane_lit[li] = -1
self.dirty = True
# ---------- practice history (saved to /history.json, next to programs.json) ----------
def _probe_write(self):
try:
with open("/.wtest", "w") as f: f.write("1")
try: os.remove("/.wtest")
except Exception: pass
return True
except OSError:
return False # editor mode: the computer owns the FS
def _load_log(self):
try:
with open("/history.json") as f: return json.load(f).get("log", [])
except Exception:
return []
def _save_log(self):
if not self.can_write: return
try:
with open("/history.json", "w") as f: json.dump({"log": self.log[:200]}, f)
except OSError:
self.can_write = False
def _start_play(self):
self.play_start = time.monotonic(); self.play_bpm = self.bpm; self.play_name = self.name
def _log_play(self):
if self.play_start is None: return
dur = int(time.monotonic() - self.play_start); self.play_start = None
if dur < MIN_LOG_SEC: return # skip plays under 5 seconds
t = time.localtime()
self.log.insert(0, {"t": "%02d:%02d" % (t.tm_hour, t.tm_min), "bpm": self.play_bpm,
"dur": dur, "name": self.play_name})
del self.log[200:]; self._armed = None
self._save_log(); self.draw_log()
def draw_log(self):
g = self.g_log
while len(g): g.pop()
self.log_rows = []
hdr, w, h = make_text("PRACTICE LOG", FONT_S, C_MUTE, C_BG); hdr.x = 10; hdr.y = LOG_TOP; g.append(hdr)
if not self.log:
tg, w, h = make_text("plays over 5s show here", FONT_S, C_DIM, C_BG); tg.x = 10; tg.y = LOG_TOP + LOG_ROWH; g.append(tg)
self.dirty = True; return
y = LOG_TOP + LOG_ROWH + 2
for idx in range(min(LOG_ROWS, len(self.log))):
e = self.log[idx]; armed = (idx == self._armed)
dur = "%d:%02d" % (e["dur"] // 60, e["dur"] % 60)
line = "%s%s %3d %5s %s" % ("x " if armed else "", e.get("t", "--:--"), e["bpm"], dur, e["name"][:16])
tg, w, h = make_text(line, FONT_S, C_AMBER if armed else C_TXT, C_BG); tg.x = 10; tg.y = y; g.append(tg)
self.log_rows.append((y - 2, y + LOG_ROWH - 2, idx))
y += LOG_ROWH
self.dirty = True
def _tap_log(self, x, ty):
for y0, y1, idx in self.log_rows:
if y0 <= ty <= y1:
if self._armed == idx: del self.log[idx]; self._armed = None; self._save_log(); self.draw_log() # confirm delete
else: self._armed = idx; self.draw_log() # arm (tap again)
return
if self._armed is not None: self._armed = None; self.draw_log() # tapped elsewhere -> cancel
# ---------- USB-MIDI in: SysEx assembler (clock + editor-pushed programs) ----------
def _feed_midi(self, buf, n):
for i in range(n):
b = buf[i]
if b == 0xF0: self._sx = bytearray(); self._sxon = True
elif b == 0xF7:
if self._sxon: self._handle_sysex(self._sx)
self._sxon = False
elif b >= 0xF8: pass # real-time (e.g. Active Sensing 0xFE) - ignore
elif self._sxon:
if len(self._sx) < 60000: self._sx.append(b) # big enough for a pushed firmware (app.py)
else: self._sxon = False # overflow guard
def _handle_sysex(self, sx):
if len(sx) < 2 or sx[0] != 0x7D: return # 0x7D = our (educational) manufacturer id
cmd = sx[1]
if cmd == 0x01 and len(sx) >= 8 and rtc is not None: # set clock: yr-2000, mo, dd, hh, mm, ss
try: rtc.RTC().datetime = time.struct_time((2000 + sx[2], sx[3], sx[4], sx[5], sx[6], sx[7], 0, -1, -1))
except Exception: pass
elif cmd == 0x02: # version query -> reply 0x03 + APP_VERSION
if self.midi: self.midi.write(bytes([0xF0, 0x7D, 0x03]) + APP_VERSION.encode() + bytes([0xF7]))
elif cmd == 0x10: # write /programs.json pushed from the editor, then reload
try:
with open("/programs.json", "wb") as f: f.write(bytes(sx[2:]))
self.programs = load_programs(); self.idx = min(self.idx, len(self.programs) - 1)
self.load(self.idx)
if self.midi: self.midi.write(bytes([0xF0, 0x7D, 0x7F, 0xF7])) # ACK ok
except OSError:
if self.midi: self.midi.write(bytes([0xF0, 0x7D, 0x7E, 0xF7])) # NAK: read-only (editor mode)
elif cmd == 0x20: # A/B firmware update: install new app.py to the trial slot
try:
data = bytes(sx[2:])
try: os.remove("/app.bak")
except OSError: pass
os.rename("/app.py", "/app.bak") # keep the current build as the rollback
with open("/app.py", "wb") as f: f.write(data)
open("/trial", "w").close() # arm the trial; the loader reverts if it won't boot
if self.midi: self.midi.write(bytes([0xF0, 0x7D, 0x7F, 0xF7])) # ACK -> rebooting
time.sleep(0.3); supervisor.reload()
except OSError:
if self.midi: self.midi.write(bytes([0xF0, 0x7D, 0x7E, 0xF7])) # NAK: read-only (editor mode)
def run(self):
if self.touch.addr is None:
print("GT911 touch not found")
boot = time.monotonic()
try: os.stat("/trial"); committed = False # we're a freshly-pushed build on trial
except OSError: committed = True
while True:
self.tick(); self.poll()
if not committed and time.monotonic() - boot > 5: # booted & ran fine for 5s -> confirm the update
try: os.remove("/trial")
except Exception: pass
committed = True
# push a complete frame only when something changed (no mid-update tearing);
# capped at the display's refresh rate, so dirty regions stay small and quick
if self.dirty and self.display.refresh():
self.dirty = False
time.sleep(0.0005)
App().run()

639
pico-cp/code.py
View file

@ -1,626 +1,23 @@
# VARASYS PolyMeter — PM_K-1 "Kit" firmware (CircuitPython edition)
# Raspberry Pi Pico (Pico / Pico W / Pico 2) on the 52Pi EP-0172 "Pico Breadboard Kit Plus":
# 3.5" ST7796 320x480 cap-touch (GT911), PSP joystick, WS2812 RGB, buzzer, 2 buttons.
# code.py - PM_K-1 A/B firmware loader (stable; rarely changes).
#
# WHY CIRCUITPYTHON: the board then mounts as a USB drive (CIRCUITPY) carrying this code, your
# tracks (programs.json) and a copy of the editor — edit on the web, "Save to device" writes
# programs.json here, and CircuitPython auto-reloads with the new grooves. It also sends USB-MIDI
# (a note per click) so the web editor can play it out the computer's speakers ("Device audio").
# Runs the SAME program strings as metronome.varasys.io.
#
# INSTALL: flash CircuitPython (https://circuitpython.org/board/raspberry_pi_pico/), then copy
# this file as code.py plus programs.json onto the CIRCUITPY drive. It runs on boot.
#
# Fallback: the simpler MicroPython firmware (pico/main.py) is always available — BOOTSEL +
# drag a MicroPython .uf2 to go back. The Pico cannot be bricked.
#
# Untested-panel notes & calibration flags are in CONFIG + pico-cp/README.md.
# The real application lives in app.py; app.bak holds the previous known-good build. The web editor
# pushes a new app.py to a "trial" slot over USB-MIDI; this loader runs it, and if the new build
# fails to boot it AUTOMATICALLY ROLLS BACK to app.bak. (The Pico is also unbrickable: BOOTSEL ->
# drag a CircuitPython .uf2.) app.py clears the /trial marker once it has run healthily for ~5s.
import supervisor, os
supervisor.runtime.autoreload = False # updates reboot explicitly; never auto-restart on our own writes
def _trial():
try: os.stat("/trial"); return True
except OSError: return False
import board, busio, digitalio, analogio, pwmio, displayio, vectorio, time, json, gc, os, supervisor
supervisor.runtime.autoreload = False # we write our own files (log + pushed programs); never self-restart
try:
import rtc # set from the editor's clock SysEx so the log has real timestamps
except ImportError:
rtc = None
try: # CircuitPython 9.x
from fourwire import FourWire
from busdisplay import BusDisplay
except ImportError: # CircuitPython 8.x
from displayio import FourWire
from displayio import Display as BusDisplay
try:
import neopixel_write # core module on RP2040 — drives WS2812 with no external library
except ImportError:
neopixel_write = None
try:
import usb_midi # default-enabled on RP2040 — sends a MIDI note per click to the computer
except ImportError:
usb_midi = None
# ============================== CONFIG (tweak if needed) ==============================
SPI_BAUD = 62_500_000 # faster SPI = smaller tearing window; drop to 40_000_000 if unstable
LED_BRIGHTNESS = 0.15 # WS2812 sits right next to you — keep it dim (0..1)
MIDI_ENABLED = True # send a USB-MIDI note per click (play via the web editor's "Device audio")
MUTE_BUZZER = False # silence the on-board buzzer (e.g. when using computer audio)
WIDTH, HEIGHT = 320, 480
MADCTL = 0x48 # portrait; 0x48 swaps R/B for this BGR panel (cyan reads cyan). Use 0x40 if reversed.
INVERT_COLORS = True # most ST7796 modules need inversion ON; set False if colours look negative
# Touch (GT911) — flip if taps land wrong:
TOUCH_SWAP_XY = False
TOUCH_INVERT_X = False
TOUCH_INVERT_Y = False
TOUCH_DEBUG = False
# Joystick:
JOY_INVERT_X = False
JOY_INVERT_Y = False
JOY_DEADZONE = 9000
# ----- pins (fixed by the EP-0172 board) -----
P_SCK, P_MOSI, P_CS, P_DC, P_RST = board.GP2, board.GP3, board.GP5, board.GP6, board.GP7
P_SDA, P_SCL = board.GP8, board.GP9
P_RGB, P_BUZ, P_BTNA, P_BTNB = board.GP12, board.GP13, board.GP15, board.GP14
P_JOYX, P_JOYY = board.GP26, board.GP27
# ----- baked default grooves (used only if programs.json is missing/bad) -----
DEFAULT_PROGRAMS = [
("Four on the floor", "t120;kick:4;snare:4=.x.x;hatClosed:4/2"),
("Swing ride", "t150;ride:4/2s;kick:4=X..x;snare:4=.x.x"),
("7/8 (2+2+3)", "t130;kick:2+2+3=x..x..x;hatClosed:2+2+3/2"),
("5 over 4", "t100;kick:4;claves:5~"),
("Straight click", "t120;beep:4"),
]
# ============================== COLOURS (0xRRGGBB; displayio handles 565) ==============================
C_BG, C_PANEL, C_TXT, C_MUTE = 0x06090E, 0x1C222C, 0xC7D0DB, 0x788494
C_CYAN, C_AMBER, C_GREEN, C_DIM = 0x0AB3F7, 0xFF9B2E, 0x2FE07A, 0x243240
C_BTN = 0x1C222C
LEVEL_RGB = {2: (255, 110, 0), 1: (0, 150, 255), 3: (130, 70, 255)}
# voice -> General-MIDI note (USB-MIDI bridge), and level -> MIDI velocity
SOUND_GM = {"kick":36,"kick808":36,"kick909":36, "snare":38,"snare808":38,"snare909":38,
"clap":39,"clap808":39,"clap909":39, "rim":37, "hatClosed":42,"hat808":42,"hat909":42,
"hatOpen":46,"openHat808":46, "ride":51,"ride909":51, "crash":49,"crash909":49,
"tomLow":41,"tom808":45,"tomMid":45,"tomHigh":48, "tambourine":54,
"cowbell":56,"cowbell808":56, "woodblock":76,"jamblock":76, "claves":75, "beep":37}
GM_DEFAULT = 37
MIDI_VEL = {2: 120, 1: 90, 3: 45} # accent / normal / ghost
MAXLANES = 5 # lanes shown on the pad grid (extras still play)
LOG_TOP, LOG_ROWH, LOG_ROWS = 302, 16, 9 # practice-history log area (below the pad grid)
MIN_LOG_SEC = 5 # don't log plays shorter than this
PAD_DIM = (0x10161E, 0x0A3A52, 0x4A3010, 0x2A1D4A) # idle pad: mute / normal / accent / ghost
PAD_LIT = (0x39414D, 0x0AB3F7, 0xFF9B2E, 0x967BFF) # playhead pad: mute / normal / accent / ghost
# WS2812 RGB LED — self-contained via the core neopixel_write module (no external library)
class RGB:
def __init__(self, pin):
self.ok = neopixel_write is not None
if self.ok:
self.io = digitalio.DigitalInOut(pin); self.io.direction = digitalio.Direction.OUTPUT
self.buf = bytearray(3)
def set(self, r, g, b):
if not self.ok: return
# WS2812 wants GRB order; scale down so it isn't blinding
self.buf[0] = int(g * LED_BRIGHTNESS); self.buf[1] = int(r * LED_BRIGHTNESS); self.buf[2] = int(b * LED_BRIGHTNESS)
try: neopixel_write.neopixel_write(self.io, self.buf)
except Exception: self.ok = False
# ============================== ANTI-ALIASED FONTS (binary blobs on the drive; see pico/gen_font.py) ==============================
def load_font(path):
with open(path, "rb") as f:
blob = f.read()
count = blob[0]; p = 1; pixoff = 1 + count * 7; glyphs = {}
for _ in range(count):
cp = (blob[p] << 8) | blob[p+1]; w = blob[p+2]; h = blob[p+3]
xoff = blob[p+4]; xoff = xoff - 256 if xoff > 127 else xoff
top = blob[p+5]; adv = blob[p+6]; p += 7
glyphs[cp] = (w, h, xoff, top, adv, pixoff); pixoff += (w * h + 1) // 2
return (glyphs, blob)
FONT_S = load_font("/font_s.bin") # small — pad-grid lane labels
FONT_M = load_font("/font_m.bin") # labels / buttons
FONT_L = load_font("/font_l.bin") # big BPM
gc.collect()
def _blend(bg, fg, i):
t = i * 17
r = (((bg >> 16) & 0xFF)*(255-t) + ((fg >> 16) & 0xFF)*t) // 255
g = (((bg >> 8) & 0xFF)*(255-t) + ((fg >> 8) & 0xFF)*t) // 255
b = ((bg & 0xFF)*(255-t) + (fg & 0xFF)*t) // 255
return (r << 16) | (g << 8) | b
def make_text(s, font, fg, bg):
"""Render a string into a displayio TileGrid (anti-aliased via a 16-step blend palette)."""
glyphs, blob = font
w = 0; top0 = 999; bot = 0
for c in s:
g = glyphs.get(ord(c))
if not g: continue
w += g[4]
if g[1]:
if g[3] < top0: top0 = g[3]
if g[3] + g[1] > bot: bot = g[3] + g[1]
if top0 == 999: top0 = 0
w = max(1, w); h = max(1, bot - top0)
gc.collect()
bmp = displayio.Bitmap(w, h, 16)
pal = displayio.Palette(16)
for i in range(16): pal[i] = _blend(bg, fg, i)
pen = 0
for c in s:
g = glyphs.get(ord(c))
if not g: continue
gw, gh, xoff, gtop, adv, off = g
for j in range(gh):
row = (gtop - top0) + j
for i in range(gw):
k = j * gw + i
byte = blob[off + (k >> 1)]
nib = (byte >> 4) if (k & 1) == 0 else (byte & 0xF)
if nib:
x = pen + xoff + i
if 0 <= x < w and 0 <= row < h: bmp[x, row] = nib
pen += adv
return displayio.TileGrid(bmp, pixel_shader=pal), w, h
# ============================== POLYMETER ENGINE (same semantics as the web/MicroPython) ==============================
PAT = {'X': 2, 'x': 1, 'g': 3, '.': 0, '-': 0, '_': 0}
PRIO = {2: 3, 1: 2, 3: 1}
def parse_program(s):
bpm = 120; lanes = []
for tok in s.strip().split(';'):
tok = tok.strip()
if not tok: continue
if tok[0] == 't' and tok[1:].isdigit():
bpm = int(tok[1:]); continue
if ':' not in tok: continue
lane = _parse_lane(tok)
if lane: lanes.append(lane)
if not lanes: lanes = [_parse_lane("beep:4")]
return max(30, min(300, bpm)), lanes
def _parse_lane(tok):
poly = '~' in tok; mute = '!' in tok
tok = tok.replace('~', '').replace('!', '')
if '@' in tok: tok = tok.split('@')[0]
sound, _, rest = tok.partition(':')
pattern = None
if '=' in rest: rest, _, pattern = rest.partition('=')
sub = 1; swing = False
if '/' in rest:
rest, _, sd = rest.partition('/')
swing = sd.endswith('s'); sd = sd.rstrip('s') # "/2s" = swung eighths
sub = int(sd) if sd.isdigit() else 1
groups = [int(g) for g in rest.split('+') if g.isdigit()] or [4]
beats = sum(groups); starts = set(); acc = 0
for gp in groups: starts.add(acc); acc += gp
steps = beats * sub
if pattern:
levels = [PAT.get(ch, 0) for ch in pattern]
if len(levels) < steps: levels += [0] * (steps - len(levels))
steps = len(levels)
else:
levels = []
for i in range(steps):
if i % sub == 0: levels.append(2 if (i // sub) in starts else 1)
else: levels.append(0)
return {'sound': sound, 'sub': sub, 'swing': swing, 'steps': steps, 'levels': levels, 'poly': poly, 'mute': mute}
def load_programs():
try:
with open("/programs.json") as f:
d = json.load(f)
progs = [(p["name"], p["prog"]) for p in d["programs"]]
if progs: return progs
except Exception as e:
print("programs.json:", e)
return DEFAULT_PROGRAMS
# ============================== GT911 TOUCH ==============================
class GT911:
def __init__(self, i2c):
self.i2c = i2c; self.addr = None
while not i2c.try_lock(): pass
try: found = i2c.scan()
finally: i2c.unlock()
for a in (0x5D, 0x14):
if a in found: self.addr = a; break
if self.addr is None and found: self.addr = found[0]
def _rd(self, reg, n):
b = bytearray(n)
while not self.i2c.try_lock(): pass
import app # runs the application (app.py ends with App().run())
except Exception:
if _trial(): # a freshly-pushed build crashed on startup -> roll back
try:
self.i2c.writeto(self.addr, bytes([reg >> 8, reg & 0xFF]))
self.i2c.readfrom_into(self.addr, b)
finally: self.i2c.unlock()
return b
def _wr(self, reg, val):
while not self.i2c.try_lock(): pass
try: self.i2c.writeto(self.addr, bytes([reg >> 8, reg & 0xFF, val]))
finally: self.i2c.unlock()
def read(self):
if self.addr is None: return None
try: st = self._rd(0x814E, 1)[0]
except OSError: return None
if not (st & 0x80): return None
n = st & 0x0F; pt = None
if n >= 1:
b = self._rd(0x8150, 4); tx = b[0] | (b[1] << 8); ty = b[2] | (b[3] << 8)
pt = self._map(tx, ty)
try: self._wr(0x814E, 0)
except OSError: pass
return pt
def _map(self, tx, ty):
if TOUCH_DEBUG: print("touch raw", tx, ty)
if TOUCH_SWAP_XY: tx, ty = ty, tx
if TOUCH_INVERT_X: tx = WIDTH - 1 - tx
if TOUCH_INVERT_Y: ty = HEIGHT - 1 - ty
if 0 <= tx < WIDTH and 0 <= ty < HEIGHT: return (tx, ty)
return None
# ============================== DISPLAY SETUP ==============================
def st7796_init():
inv = b'\x21\x00' if INVERT_COLORS else b'\x20\x00'
return (
b'\x01\x80\x78' # SWRESET + 120ms
b'\x11\x80\x78' # SLPOUT + 120ms
b'\xF0\x01\xC3' b'\xF0\x01\x96' # command-set unlock
+ bytes([0x36, 0x01, MADCTL]) +
b'\x3A\x01\x55' # 16bpp
b'\xB4\x01\x01'
b'\xB6\x03\x80\x02\x3B'
b'\xE8\x08\x40\x8A\x00\x00\x29\x19\xA5\x33'
b'\xC1\x01\x06' b'\xC2\x01\xA7'
b'\xC5\x81\x18\x78' # VCOM + 120ms
b'\xE0\x0E\xF0\x09\x0B\x06\x04\x15\x2F\x54\x42\x3C\x17\x14\x18\x1B'
b'\xE1\x0E\xE0\x09\x0B\x06\x04\x03\x2B\x43\x42\x3B\x16\x14\x17\x1B'
b'\xF0\x01\x3C' b'\xF0\x81\x69\x78' # lock + 120ms
+ inv +
b'\x29\x80\x32' # DISPON + 50ms
)
def make_display():
displayio.release_displays()
spi = busio.SPI(clock=P_SCK, MOSI=P_MOSI)
bus = FourWire(spi, command=P_DC, chip_select=P_CS, reset=P_RST, baudrate=SPI_BAUD)
return BusDisplay(bus, st7796_init(), width=WIDTH, height=HEIGHT, auto_refresh=False)
def solid(color):
p = displayio.Palette(1); p[0] = color; return p
def rect(x, y, w, h, color):
return vectorio.Rectangle(pixel_shader=solid(color), width=w, height=h, x=x, y=y)
# ============================== APP ==============================
class App:
def __init__(self):
self.display = make_display()
self.i2c = busio.I2C(scl=P_SCL, sda=P_SDA, frequency=400_000)
self.touch = GT911(self.i2c)
self.midi = usb_midi.ports[1] if (MIDI_ENABLED and usb_midi and len(usb_midi.ports) > 1) else None
self.midi_in = usb_midi.ports[0] if (MIDI_ENABLED and usb_midi and len(usb_midi.ports) > 0) else None
self._mbuf = bytearray(64); self.midi_host = False; self.last_midi_in = 0.0
self._sx = bytearray(); self._sxon = False # USB-MIDI SysEx assembler (clock + pushed programs)
self.led = RGB(P_RGB)
self.buz = pwmio.PWMOut(P_BUZ, frequency=1600, variable_frequency=True, duty_cycle=0)
self.buz_off = 0
self.btnA = self._btn(P_BTNA); self.btnB = self._btn(P_BTNB)
self._aPrev = True; self._bPrev = True
self.jx = analogio.AnalogIn(P_JOYX); self.jy = analogio.AnalogIn(P_JOYY)
self._joyNext = 0
self._touchDown = False; self._touchSeen = 0
self.running = False; self.bpm = 120; self.idx = 0; self.lanes = []; self.rgb = (0, 0, 0)
self.programs = load_programs()
self.dirty = True
self.pad_pal = displayio.Palette(8)
for i in range(4): self.pad_pal[i] = PAD_DIM[i]; self.pad_pal[i + 4] = PAD_LIT[i]
self.lane_pads = []; self.lane_lit = []
# practice history — persisted to /history.json (next to programs.json) when we own the filesystem
self.can_write = self._probe_write()
self.log = self._load_log()
self.play_start = None; self.play_bpm = 0; self.play_name = ""
self._armed = None; self.log_rows = []
self._build_scene()
self.load(0)
self.draw_log()
def _btn(self, pin):
d = digitalio.DigitalInOut(pin); d.direction = digitalio.Direction.INPUT; d.pull = digitalio.Pull.UP
return d
# ---------- scene graph ----------
def _build_scene(self):
root = displayio.Group(); self.display.root_group = root
root.append(rect(0, 0, WIDTH, HEIGHT, C_BG))
tg, w, h = make_text("PM_K-1 KIT", FONT_M, C_CYAN, C_BG); tg.x = 12; tg.y = 8; root.append(tg)
root.append(rect(0, 38, WIDTH, 2, C_PANEL))
# dynamic groups
self.g_bpm = displayio.Group(); root.append(self.g_bpm) # big tempo (right)
self.g_run = displayio.Group(); root.append(self.g_run) # RUN / STOP (left)
self.g_name = displayio.Group(); root.append(self.g_name) # item index + name
self.g_midi = displayio.Group(); root.append(self.g_midi) # "MIDI" indicator (top-right) when a host is listening
self.g_grid = displayio.Group(); root.append(self.g_grid) # lanes × step pads
root.append(rect(0, LOG_TOP - 6, WIDTH, 2, C_PANEL)) # divider above the history log
self.g_log = displayio.Group(); root.append(self.g_log) # practice history (tap a row to delete)
# (no on-screen buttons — transport is the joystick + buttons A/B; touch deletes log rows)
def _place(self, group, s, x, y, fg, bg, font, right_edge=None):
while len(group): group.pop()
self.dirty = True
if not s: return
tg, w, h = make_text(s, font, fg, bg)
tg.x = (right_edge - w) if right_edge is not None else x; tg.y = y; group.append(tg)
def _center(self, group, s, cx, cy, fg, bg, font):
while len(group): group.pop()
tg, w, h = make_text(s, font, fg, bg); tg.x = cx - w//2; tg.y = cy - h//2; group.append(tg)
self.dirty = True
# ---------- program ----------
def load(self, i):
n = len(self.programs); self.idx = i % n
self.name, prog = self.programs[self.idx]
self.bpm, self.lanes = parse_program(prog)
self.master = self.lanes[0]
self._reset_clock(); self.draw_bpm(); self.draw_status(); self.build_grid()
def _step_dur(self, L, step):
beat = 60_000_000_000 / self.bpm
if L['poly']: # ~ polymeter: fit this lane's whole cycle into lane 1's bar
m = self.lanes[0]; master_bar = beat * (m['steps'] // m['sub'])
return int(master_bar / L['steps'])
sub = L['sub']
if L['swing'] and sub % 2 == 0: # swing even subdivisions: long–short (2:1) pairs
pair = beat / (sub // 2)
return int(pair * 2 / 3) if (step % sub) % 2 == 0 else int(pair / 3)
return int(beat / sub) # straight: a step = one beat / subdivision
def _reset_clock(self):
now = time.monotonic_ns()
for L in self.lanes:
L['next'] = now; L['step'] = -1
# ---------- audio + light ----------
def click(self, level):
self.buz.frequency = {2: 2300, 1: 1600, 3: 1050}.get(level, 1600)
self.buz.duty_cycle = {2: 42000, 1: 30000, 3: 14000}.get(level, 30000)
self.buz_off = time.monotonic_ns() + 22_000_000
def flash(self, level):
self.rgb = LEVEL_RGB.get(level, (0, 150, 255))
self.led.set(*self.rgb)
def led_off(self):
self.rgb = (0, 0, 0)
self.led.set(0, 0, 0)
def midi_send(self, note, vel): # device-as-conductor: a note per click to the computer
if self.midi is None: return
try: self.midi.write(bytes([0x90, note, vel])) # Note On (percussive — no Note Off needed)
os.remove("/app.py"); os.rename("/app.bak", "/app.py"); os.remove("/trial")
except Exception: pass
# ---------- transport ----------
def toggle(self):
self.running = not self.running
if self.running: self._reset_clock(); self._start_play()
else: self.buz.duty_cycle = 0; self.led_off(); self.reset_playheads(); self._log_play()
self.draw_status()
def set_bpm(self, v):
v = max(30, min(300, v))
if v != self.bpm:
self.bpm = v
self.draw_bpm()
def goto(self, i):
was = self.running
if was: self.running = False; self._log_play() # close out the track that was playing
self.load(i)
if was: self.running = True; self._reset_clock(); self._start_play()
def tap(self):
now = time.monotonic()
if not hasattr(self, '_taps'): self._taps = []
self._taps = [t for t in self._taps if now - t < 2.4]
self._taps.append(now)
if len(self._taps) >= 2:
span = (self._taps[-1] - self._taps[0]) / (len(self._taps) - 1)
if span > 0: self.set_bpm(round(60 / span))
# ---------- scheduler ----------
def tick(self):
now = time.monotonic_ns()
if self.buz_off and now >= self.buz_off: self.buz.duty_cycle = 0; self.buz_off = 0
if self.running:
fired = []
for li, L in enumerate(self.lanes):
adv = False
while now >= L['next']:
L['step'] = (L['step'] + 1) % L['steps']
lvl = 0 if L['mute'] else L['levels'][L['step']]
if lvl > 0:
fired.append(lvl)
self.midi_send(SOUND_GM.get(L['sound'], GM_DEFAULT), MIDI_VEL.get(lvl, 90)) # one note per lane
L['next'] += self._step_dur(L, L['step']); adv = True
if adv and li < len(self.lane_pads): self._move_playhead(li, L['step'])
if fired:
best = max(fired, key=lambda l: PRIO.get(l, 0))
if not MUTE_BUZZER and not self.midi_host: self.click(best) # computer plays it instead
self.flash(best)
if self.rgb != (0, 0, 0):
r, g, b = self.rgb; r = r*7//10; g = g*7//10; b = b*7//10
self.rgb = (r, g, b) if (r+g+b) > 12 else (0, 0, 0)
self.led.set(*self.rgb)
# ---------- inputs ----------
def poll(self):
a = self.btnA.value
if (not a) and self._aPrev: self.toggle()
self._aPrev = a
b = self.btnB.value
if (not b) and self._bPrev: self.tap()
self._bPrev = b
now = time.monotonic_ns()
if now >= self._joyNext:
x = self.jx.value - 32768; y = self.jy.value - 32768
if JOY_INVERT_X: x = -x
if JOY_INVERT_Y: y = -y
if abs(y) > JOY_DEADZONE:
self.set_bpm(self.bpm + (1 if y > 0 else -1) * (5 if abs(y) > 26000 else 1))
self._joyNext = now + 70_000_000
elif abs(x) > JOY_DEADZONE:
self.goto(self.idx + (1 if x > 0 else -1)); self._joyNext = now + 350_000_000; return
else:
self._joyNext = now + 20_000_000
pt = self.touch.read()
nowms = time.monotonic()
if pt:
self._touchSeen = nowms
if not self._touchDown:
self._touchDown = True; self._tap_log(pt[0], pt[1])
elif self._touchDown and (nowms - self._touchSeen) > 0.14:
self._touchDown = False
# USB-MIDI in: any byte = a host is listening (heartbeat); also assemble SysEx (clock / pushed programs)
if self.midi_in is not None:
try: n = self.midi_in.readinto(self._mbuf)
except Exception: n = 0
if n:
self.last_midi_in = nowms
self._feed_midi(self._mbuf, n)
host = bool(self.last_midi_in) and (nowms - self.last_midi_in) < 1.0
if host != self.midi_host:
self.midi_host = host
if host: self.buz.duty_cycle = 0 # silence the buzzer when the computer takes over
self.led_off(); self.draw_midi()
# ---------- drawing ----------
def draw_bpm(self):
self._place(self.g_bpm, str(self.bpm), 0, 44, C_TXT, C_BG, FONT_L, right_edge=WIDTH-12)
def draw_status(self):
self._place(self.g_run, "RUN" if self.running else "STOP", 12, 48,
C_GREEN if self.running else C_MUTE, C_BG, FONT_M)
self._place(self.g_name, "%d/%d %s" % (self.idx+1, len(self.programs), self.name[:18]),
12, 112, C_TXT, C_BG, FONT_M)
def draw_midi(self):
self._place(self.g_midi, "MIDI" if self.midi_host else "", 0, 12, C_GREEN, C_BG, FONT_M, right_edge=WIDTH-12)
# ---------- pad grid (each lane = a row of step pads; playhead lit as it plays) ----------
def _padbase(self, L, s):
return 0 if L['mute'] else L['levels'][s]
def build_grid(self):
while len(self.g_grid): self.g_grid.pop()
self.lane_pads = []; self.lane_lit = []
n = min(len(self.lanes), MAXLANES)
top = 140; rowh = min(40, (296 - top) // max(1, n))
for li in range(n):
L = self.lanes[li]; y = top + li * rowh; cy = y + rowh // 2
tg, w, h = make_text((L.get('sound', '') or '?')[:7], FONT_S, C_MUTE, C_BG)
tg.x = 8; tg.y = cy - h // 2; self.g_grid.append(tg)
steps = L['steps']; sub = L['sub']; px0 = 60
usable = WIDTH - 8 - px0 - 12; stepw = max(1, usable // steps)
r_big = max(2, min(6, stepw // 2, (rowh - 8) // 2)); r_sml = max(2, r_big - 2)
pads = []
for s in range(steps):
rad = r_big if (s % sub == 0) else r_sml # big = beat (division), small = subdivision
cxp = px0 + 6 + (s * usable) // steps # proportional → beats line up across lanes
c = vectorio.Circle(pixel_shader=self.pad_pal, radius=rad, x=cxp, y=cy)
c.color_index = self._padbase(L, s); self.g_grid.append(c); pads.append(c)
self.lane_pads.append(pads); self.lane_lit.append(-1)
self.dirty = True
def _move_playhead(self, li, step):
pads = self.lane_pads[li]; prev = self.lane_lit[li]
if 0 <= prev < len(pads): pads[prev].color_index = self._padbase(self.lanes[li], prev)
if step < len(pads): pads[step].color_index = self._padbase(self.lanes[li], step) + 4
self.lane_lit[li] = step; self.dirty = True
def reset_playheads(self):
for li, pads in enumerate(self.lane_pads):
prev = self.lane_lit[li]
if 0 <= prev < len(pads): pads[prev].color_index = self._padbase(self.lanes[li], prev)
self.lane_lit[li] = -1
self.dirty = True
# ---------- practice history (saved to /history.json, next to programs.json) ----------
def _probe_write(self):
try:
with open("/.wtest", "w") as f: f.write("1")
try: os.remove("/.wtest")
except Exception: pass
return True
except OSError:
return False # editor mode: the computer owns the FS
def _load_log(self):
try:
with open("/history.json") as f: return json.load(f).get("log", [])
except Exception:
return []
def _save_log(self):
if not self.can_write: return
try:
with open("/history.json", "w") as f: json.dump({"log": self.log[:200]}, f)
except OSError:
self.can_write = False
def _start_play(self):
self.play_start = time.monotonic(); self.play_bpm = self.bpm; self.play_name = self.name
def _log_play(self):
if self.play_start is None: return
dur = int(time.monotonic() - self.play_start); self.play_start = None
if dur < MIN_LOG_SEC: return # skip plays under 5 seconds
t = time.localtime()
self.log.insert(0, {"t": "%02d:%02d" % (t.tm_hour, t.tm_min), "bpm": self.play_bpm,
"dur": dur, "name": self.play_name})
del self.log[200:]; self._armed = None
self._save_log(); self.draw_log()
def draw_log(self):
g = self.g_log
while len(g): g.pop()
self.log_rows = []
hdr, w, h = make_text("PRACTICE LOG", FONT_S, C_MUTE, C_BG); hdr.x = 10; hdr.y = LOG_TOP; g.append(hdr)
if not self.log:
tg, w, h = make_text("plays over 5s show here", FONT_S, C_DIM, C_BG); tg.x = 10; tg.y = LOG_TOP + LOG_ROWH; g.append(tg)
self.dirty = True; return
y = LOG_TOP + LOG_ROWH + 2
for idx in range(min(LOG_ROWS, len(self.log))):
e = self.log[idx]; armed = (idx == self._armed)
dur = "%d:%02d" % (e["dur"] // 60, e["dur"] % 60)
line = "%s%s %3d %5s %s" % ("x " if armed else "", e.get("t", "--:--"), e["bpm"], dur, e["name"][:16])
tg, w, h = make_text(line, FONT_S, C_AMBER if armed else C_TXT, C_BG); tg.x = 10; tg.y = y; g.append(tg)
self.log_rows.append((y - 2, y + LOG_ROWH - 2, idx))
y += LOG_ROWH
self.dirty = True
def _tap_log(self, x, ty):
for y0, y1, idx in self.log_rows:
if y0 <= ty <= y1:
if self._armed == idx: del self.log[idx]; self._armed = None; self._save_log(); self.draw_log() # confirm delete
else: self._armed = idx; self.draw_log() # arm (tap again)
return
if self._armed is not None: self._armed = None; self.draw_log() # tapped elsewhere -> cancel
# ---------- USB-MIDI in: SysEx assembler (clock + editor-pushed programs) ----------
def _feed_midi(self, buf, n):
for i in range(n):
b = buf[i]
if b == 0xF0: self._sx = bytearray(); self._sxon = True
elif b == 0xF7:
if self._sxon: self._handle_sysex(self._sx)
self._sxon = False
elif b >= 0xF8: pass # real-time (e.g. Active Sensing 0xFE) — ignore
elif self._sxon:
if len(self._sx) < 6000: self._sx.append(b)
else: self._sxon = False # overflow guard
def _handle_sysex(self, sx):
if len(sx) < 2 or sx[0] != 0x7D: return # 0x7D = our (educational) manufacturer id
cmd = sx[1]
if cmd == 0x01 and len(sx) >= 8 and rtc is not None: # set clock: yr-2000, mo, dd, hh, mm, ss
try: rtc.RTC().datetime = time.struct_time((2000 + sx[2], sx[3], sx[4], sx[5], sx[6], sx[7], 0, -1, -1))
except Exception: pass
elif cmd == 0x10: # write /programs.json pushed from the editor, then reload
try:
with open("/programs.json", "wb") as f: f.write(bytes(sx[2:]))
self.programs = load_programs(); self.idx = min(self.idx, len(self.programs) - 1)
self.load(self.idx)
if self.midi: self.midi.write(bytes([0xF0, 0x7D, 0x7F, 0xF7])) # ACK ok
except OSError:
if self.midi: self.midi.write(bytes([0xF0, 0x7D, 0x7E, 0xF7])) # NAK: read-only (editor mode)
def run(self):
if self.touch.addr is None:
print("GT911 touch not found")
while True:
self.tick(); self.poll()
# push a complete frame only when something changed (no mid-update tearing);
# capped at the display's refresh rate, so dirty regions stay small and quick
if self.dirty and self.display.refresh():
self.dirty = False
time.sleep(0.0005)
App().run()
supervisor.reload() # reboot into the restored known-good build
else:
raise # the active build failed unexpectedly (rare) -> on-screen traceback