# 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, speaker, 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 = "0.0.14" # 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 try: from binascii import a2b_base64 # decode the base64-encoded .mpy pushed by the editor's one-click update except ImportError: a2b_base64 = 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") MIDI_CHANNEL = 10 # 1..16 - GM channel 10 is the drum channel (what DAWs auto-route to drums) MIDI_CLOCK_OUT = False # send 24 PPQN MIDI Clock so a DAW can slave its tempo to the metronome MIDI_CLOCK_OUT_TRANSPORT = True # also send Start (0xFA) / Stop (0xFC) on play / stop (relevant if MIDI_CLOCK_OUT) MUTE_SPEAKER = False # always silence the on-board speaker SPEAKER_AUTO_MUTE = True # auto-mute the speaker when a MIDI host is listening (computer plays it instead) 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_SPK, P_BTNA, P_BTNB = board.GP12, board.GP13, board.GP15, board.GP14 P_JOYX, P_JOYY = board.GP26, board.GP27 # ----- BUILT-IN playlists: the standard defaults from the web editor, baked in here so they update with # firmware and the user can't change/delete them. User playlists live separately in programs.json # (pushed from the editor) and never touch these. (ASCII only - it's pushed 7-bit + the fonts are ASCII.) BUILTIN_SETLISTS = [ ("Styles", [ ("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"), ("Purdie half-time shuffle", "t92;kick:4/3=X....x...x..;snare:4/3=..gg.gX.gg.g;hatClosed:4/3=X.xX.xX.xX.x"), ("Samba (2/4)", "t104;tomLow:2/4=x...X...;hatClosed:2/4;woodblock:2/4=X.xx.xX."), ("Nanigo (6/8 bembe)", "t130;cowbell:4/3=X.xx.x.xx.x.;kick:4/3=X.....X.....;hatClosed:4/3=..x..x..x..x"), ("6/8 groove", "t100;kick:3+3=x..x..;snare:3+3=...x..;hatClosed:3+3/2"), ("7/8 (2+2+3)", "t130;kick:2+2+3=x..x..x;hatClosed:2+2+3/2"), ("5/4 (3+2)", "t112;kick:3+2=x..x.;snare:3+2=..x..;hatClosed:3+2/2"), ]), ("Practice", [ ("5 over 4 polyrhythm", "t100;kick:4;claves:5~"), ("3 over 2 hemiola", "t96;woodblock:2;cowbell:3~"), ("2 & 4 & 3 over one bar", "t100;kick:3;cowbell:2~;claves:4~"), ("Triplet hats", "t100;kick:4;snare:4=.x.x;hatClosed:4/3"), ("Accents - cycle the pads", "t92;kick:4=X..X;snare:4=.X.X;hatClosed:4/2"), ("Tempo builder 80 up", "t80;woodblock:4;rmp80/4/4"), ("Gap trainer (play 2 / rest 2)", "t100;kick:4;hatClosed:4/2;tr2/2"), ]), ("Song (continuous)", [ # ~4-bar sections; with Continue on they roll one into the next ("Intro - hats & kick", "t88;b4;kick:4=X.x.;hatClosed:4/2=gggggggg"), ("Groove in - backbeat", "t88;b4;kick:4=X.x.;snare:4=.X.X;hatClosed:4/2"), ("Half-time shuffle", "t92;b4;kick:4/3=X....x...x..;snare:4/3=..gg.gX.gg.g;hatClosed:4/3=X.xX.xX.xX.x"), ("Build - ramp 92-120", "t92;b4;rmp92/4/2;kick:4;snare:4=.X.X;hatClosed:4/2"), ("Four-on-the-floor (909)", "t124;b4;kick909:4;clap909:4=.X.X;hat909:4/2=.X.X.X.X"), ("Samba break (2/4)", "t116;b4;tomLow:2/4=x...X...;hatClosed:2/4;woodblock:2/4=X.xx.xX."), ("Peak - 16ths", "t132;b4;kick:4=X..x;snare:4=.X.X;hatClosed:4/4"), ("Outro - ramp down", "t132;b4;rmp132/-7/1;kick:4=X..x;hatClosed:4/2=gggggggg"), ]), ] # ============================== 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)} # beat pulse: accent / normal / ghost LED_IDLE = (0, 80, 0) # RGB LED resting colour when stopped: dim green ("on") LED_RUN = (110, 0, 0) # RGB LED resting colour when playing: dim red (beats pulse brighter on top) # 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 SOUNDS = ["kick", "snare", "clap", "rim", "hatClosed", "hatOpen", "ride", "crash", # lane-editor sound cycle "tomLow", "tomMid", "tomHigh", "cowbell", "woodblock", "claves", "tambourine", "beep"] MIDI_VEL = {2: 120, 1: 90, 3: 45} # accent / normal / ghost MAXLANES = 5 # lanes shown on the pad grid (extras still play) GRID_TOP = 158 # top of the pad grid (leaves room for time/bar/ramp/tab rows) 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 C_GRID = 0x1A2330 # faint vertical beat gridlines (beats line up across lanes) C_RED = 0xFF5A5A # unsaved-edits (dirty) track title # 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 # ---- single-image alpha assets (logo, status icons) - blit like a one-off glyph; see gen_assets.py ---- def load_alpha(path): try: with open(path, "rb") as f: blob = f.read() return (blob[0], blob[1], blob) # (w, h, bytes); pixels start at offset 2 except Exception: return None # missing/corrupt -> caller falls back to text (no crash) def make_glyph(asset, fg, bg): w, h, blob = asset gc.collect() bmp = displayio.Bitmap(w, h, 16); pal = displayio.Palette(16) for i in range(16): pal[i] = _blend(bg, fg, i) for k in range(w * h): byte = blob[2 + (k >> 1)] nib = (byte >> 4) if (k & 1) == 0 else (byte & 0xF) if nib: bmp[k % w, k // w] = nib return displayio.TileGrid(bmp, pixel_shader=pal), pal, w, h def _recolor(pal, fg, bg): # re-tint a stored asset palette in place (tear-free) for i in range(16): pal[i] = _blend(bg, fg, i) LOGO = load_alpha("/logo.bin") # VARASYS wordmark (no tagline) ICON_MIDI = load_alpha("/midi.bin") # DIN-5: green when a MIDI host is listening ICON_USB = load_alpha("/usb.bin") # trident: lit when USB-connected to a computer gc.collect() # ============================== 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 = []; bars = 0; ramp = None; trainer = None 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 tok[0] == 'b' and tok[1:].isdigit(): # b = segment length in bars (totals + Continue) bars = int(tok[1:]); continue # (lane sounds like "beep:4" have a ':' -> not matched here) if tok.startswith('rmp'): # rmp// tempo ramp (amount may be -) p = tok[3:].split('/') if len(p) == 3: try: ramp = {'start': int(p[0]), 'amt': int(p[1]), 'every': max(1, int(p[2]))} except ValueError: pass continue if tok.startswith('tr') and '/' in tok and ':' not in tok: # tr/ gap trainer (bars) p = tok[2:].split('/') if len(p) == 2: try: trainer = {'play': max(0, int(p[0])), 'mute': max(0, int(p[1]))} except ValueError: pass 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, bars, ramp, trainer def _parse_lane(tok): poly = '~' in tok; mute = '!' in tok tok = tok.replace('~', '').replace('!', '') gain = '' if '@' in tok: tok, _, g = tok.partition('@'); gain = '@' + g # preserve @db for round-trip (engine ignores it) 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, 'groups': groups, 'gain': gain} PAT_CH = {2: 'X', 1: 'x', 3: 'g', 0: '.'} # level -> pattern char (inverse of PAT) def lane_to_str(L): # serialize a lane back to the share grammar (round-trips) s = L['sound'] + ':' + '+'.join(str(g) for g in L.get('groups', [4])) if L['sub'] != 1 or L['swing']: s += '/' + str(L['sub']) + ('s' if L['swing'] else '') s += '=' + ''.join(PAT_CH.get(v, '.') for v in L['levels']) s += L.get('gain', '') if L['poly']: s += '~' if L['mute']: s += '!' return s _ALNUM = "abcdefghijklmnopqrstuvwxyz0123456789" def _slkey(t): # normalise a title for built-in/user de-dup (no str.isalnum on CircuitPython) return "".join(c for c in t.lower() if c in _ALNUM) def load_user_setlists(): # User playlists from /programs.json (pushed by the editor). New {setlists:[{title,programs:[..]}]} form, # or the old flat {programs:[..]} (one list). Built-ins are baked in BUILTIN_SETLISTS, never here. try: with open("/programs.json") as f: d = json.load(f) except Exception as e: print("programs.json:", e); return [] def items_of(pl): return [(p.get("name", "?"), p.get("prog", "")) for p in pl if p.get("prog")] out = [] try: if isinstance(d.get("setlists"), list): for sl in d["setlists"]: it = items_of(sl.get("programs", [])) if it: out.append((sl.get("title", "My set list"), it)) elif isinstance(d.get("programs"), list): it = items_of(d["programs"]) if it: out.append((d.get("title", "My set list"), it)) except Exception as e: print("setlists:", e) return out # ============================== 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._fw = None # chunked firmware transfer: staging file handle self.led = RGB(P_RGB) self.spk = pwmio.PWMOut(P_SPK, frequency=1600, variable_frequency=True, duty_cycle=0) self.spk_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.bars = 0; self.rgb = (0, 0, 0) self.ramp = None; self.trainer = None; self._lastbar = -1; self._muted = False; self._ramp_base = 120 self._dirty = False; self._overlay = None; self._ovbtns = [] # on-device editing: unsaved edits + modal self.continue_on = False; self._advance = False; self._grid = {} # auto-advance + pad hit-test geometry self._next_pending = None; self._seam_t = 0; self._need_redraw = False # gapless seam between tracks self._displayed_bpm = -1; self._clock_next = 0 # lazy BPM redraw + MIDI Clock Out tick scheduler self.sl = 0; self.rebuild_setlists() # built-in playlists (baked) + user playlists (programs.json) self.dirty = True self.pad_pal = displayio.Palette(8) # 0-3 idle levels (mute/normal/accent/ghost), 4-7 the lit playhead 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 = [] self.usb_conn = False; self._m_steps = 0 # USB-connected state; master-lane steps (for the bar counter) self._uiNext = 0.0; self._lastTs = None; self._lastBs = None # throttle the stopwatch/bar redraw self._seg_start = 0.0 # timer origin; resets with the bar counter (each segment) self._refreshNext = 0.0; self._touchNext = 0.0 # cap display refresh + touch polling (tighter MIDI timing) self.ic_midi_pal = None; self.ic_usb_pal = None # 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) # load() also draws the (track-filtered) practice log self.draw_icons(); self.draw_meters(); self.led_rest() # LED green = on 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)) # static background (run state shows on the LED) # header: VARASYS logo (left, no tagline) + version (small, top, right of the logo) + MIDI/USB icons (right) if LOGO: tg, _p, lw, lh = make_glyph(LOGO, C_CYAN, C_BG); tg.x = 10; tg.y = 9; root.append(tg) lx = 10 + lw else: tg, w, h = make_text("VARASYS", FONT_M, C_CYAN, C_BG); tg.x = 10; tg.y = 8; root.append(tg) lx = 10 + w vtg, vw, vh = make_text("v" + APP_VERSION, FONT_S, C_DIM, C_BG); vtg.x = lx + 6; vtg.y = 8; root.append(vtg) x = WIDTH - 12 for asset, attr in ((ICON_USB, "ic_usb_pal"), (ICON_MIDI, "ic_midi_pal")): if asset: tg, pal, w, h = make_glyph(asset, C_DIM, C_BG); x -= w; tg.x = x; tg.y = 8; x -= 8 root.append(tg); setattr(self, attr, pal) 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_time = displayio.Group(); root.append(self.g_time) # elapsed [of total] (left) self.g_bar = displayio.Group(); root.append(self.g_bar) # bar [of total] (left) self.g_train = displayio.Group(); root.append(self.g_train) # ramp / gap-trainer indicators self.g_cont = displayio.Group(); root.append(self.g_cont) # CONT (Continue auto-advance) toggle indicator self.g_name = displayio.Group(); root.append(self.g_name) # track title (red when edited/unsaved) self.g_idx = displayio.Group(); root.append(self.g_idx) # set-list tab (tap to switch playlist) 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) self.g_overlay = displayio.Group(); root.append(self.g_overlay) # modal (save/revert) - drawn on top # run/stop shows on the RGB LED; tap beats to edit, tap the title to save/revert, tap the tab to switch lists 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 rebuild_setlists(self): # built-in playlists first (read-only), then user playlists from programs.json (a baked title always wins) self.setlists = [{'title': t, 'items': it, 'builtin': True} for t, it in BUILTIN_SETLISTS] seen = set(_slkey(t) for t, _ in BUILTIN_SETLISTS) for t, it in load_user_setlists(): if _slkey(t) in seen: continue seen.add(_slkey(t)); self.setlists.append({'title': t, 'items': it, 'builtin': False}) if self.sl >= len(self.setlists): self.sl = 0 def switch_setlist(self, delta=1): if len(self.setlists) < 2: return was = self.running if was: self.running = False; self._log_play() self.sl = (self.sl + delta) % len(self.setlists) self.load(0) if was: self.running = True; self._reset_clock(); self._start_play() self.led_rest(); self.draw_meters() def load(self, i): items = self.setlists[self.sl]['items'] self.idx = i % len(items) self.name, prog = items[self.idx] self.bpm, self.lanes, self.bars, self.ramp, self.trainer = parse_program(prog) self.master = self.lanes[0]; self._ramp_base = self.bpm; self._lastbar = -1; self._muted = False self._dirty = False; self._overlay = None # fresh load -> no unsaved edits self._next_pending = None; self._need_redraw = False # discard any prepared seam (user navigated away) while len(self.g_overlay): self.g_overlay.pop() # dismiss any open modal self._reset_clock(); self.draw_bpm(); self.draw_status(); self.draw_train() self.build_grid(); self.draw_log() def _prog_str(self): # serialize the current (possibly edited) track to a program string parts = ['t' + str(self.bpm)] if self.bars: parts.append('b' + str(self.bars)) if self.ramp: parts.append('rmp%d/%d/%d' % (self.ramp.get('start', self.bpm), self.ramp['amt'], self.ramp['every'])) if self.trainer: parts.append('tr%d/%d' % (self.trainer['play'], self.trainer['mute'])) for L in self.lanes: parts.append(lane_to_str(L)) return ';'.join(parts) # ---------- on-device editing: tap a beat to cycle it; tap the title to save/revert ---------- def _grid_hit(self, tx, ty): # map a touch to (kind, lane[, step]) on the pad grid g = self._grid if not g or not (g['top'] <= ty < g['top'] + g['n'] * g['rowh']): return None li = (ty - g['top']) // g['rowh'] if li >= g['n']: return None if tx < g['px0']: return ('lane', li) # tapped the lane label (lane editor = 0.1.0) L = self.lanes[li]; steps = L['steps'] s = int((tx - g['px0'] - 6) * steps / g['usable'] + 0.5) return ('beat', li, max(0, min(steps - 1, s))) def _cycle_beat(self, li, s): # off -> normal -> accent -> ghost -> off L = self.lanes[li] L['levels'][s] = {0: 1, 1: 2, 2: 3, 3: 0}[L['levels'][s]] base = self._padbase(L, s); lit = (self.lane_lit[li] == s) self.lane_pads[li][s].color_index = base + 4 if lit else base self._set_dirty() def _set_dirty(self): if not self._dirty: self._dirty = True; self.draw_status() self.dirty = True def toggle_continue(self): self.continue_on = not self.continue_on; self.draw_status() def _user_list(self, title): # find or create a user playlist for s in self.setlists: if not s['builtin'] and s['title'] == title: return s s = {'title': title, 'items': [], 'builtin': False}; self.setlists.append(s); return s def _persist_user(self): # write all user playlists back to /programs.json user = [s for s in self.setlists if not s['builtin']] data = {"setlists": [{"title": s['title'], "programs": [{"name": n, "prog": p} for n, p in s['items']]} for s in user]} try: with open("/programs.json", "w") as f: json.dump(data, f) return True except OSError: return False # editor mode: the drive is read-only to us def _save_edit(self): prog = self._prog_str(); sl = self.setlists[self.sl] if sl['builtin']: # built-ins are read-only -> save a USER copy tgt = self._user_list("My edits"); names = [n for n, _ in tgt['items']] if self.name in names: tgt['items'][names.index(self.name)] = (self.name, prog) else: tgt['items'].append((self.name, prog)) dest = ("My edits", self.name) else: sl['items'] = list(sl['items']); sl['items'][self.idx] = (self.name, prog) dest = (sl['title'], self.name) if not self._persist_user(): self._show_msg("Read-only: reboot without holding A"); return self.rebuild_setlists() # refresh, then jump to the saved (user) copy for i, s in enumerate(self.setlists): if not s['builtin'] and s['title'] == dest[0]: self.sl = i; names = [n for n, _ in s['items']] self.load(names.index(dest[1]) if dest[1] in names else 0); return self.load(0) def _revert(self): self.load(self.idx) # reload from source -> discard edits # ---------- modal overlay (save / revert / message) ---------- def _show_saverevert(self): self._overlay = 'saverevert'; g = self.g_overlay while len(g): g.pop() px, py, pw, ph = 24, 178, WIDTH - 48, 116 g.append(rect(px, py, pw, ph, C_PANEL)); g.append(rect(px, py, pw, 2, C_CYAN)) t, w, h = make_text("Unsaved edits", FONT_M, C_TXT, C_PANEL); t.x = px + 14; t.y = py + 12; g.append(t) self._ovbtns = []; by = py + 44; bh = 50; gap = 12; bw = (pw - 3 * gap) // 2 for i, (lbl, col, act) in enumerate((("SAVE", C_GREEN, self._save_edit), ("REVERT", C_AMBER, self._revert))): bx = px + gap + i * (bw + gap) g.append(rect(bx, by, bw, bh, C_BTN)); g.append(rect(bx, by, bw, 2, col)) tt, tw, th = make_text(lbl, FONT_M, col, C_BTN); tt.x = bx + (bw - tw) // 2; tt.y = by + (bh - th) // 2; g.append(tt) self._ovbtns.append((bx, by, bx + bw, by + bh, act)) c, cw, ch = make_text("tap outside to cancel", FONT_S, C_DIM, C_PANEL); c.x = px + 14; c.y = py + ph - 16; g.append(c) self.dirty = True def _show_msg(self, text): self._overlay = 'msg'; g = self.g_overlay while len(g): g.pop() px, py, pw, ph = 24, 200, WIDTH - 48, 64 g.append(rect(px, py, pw, ph, C_PANEL)); g.append(rect(px, py, pw, 2, C_AMBER)) t, w, h = make_text(text[:28], FONT_S, C_TXT, C_PANEL); t.x = px + 12; t.y = py + 14; g.append(t) t2, w2, h2 = make_text("(tap to dismiss)", FONT_S, C_DIM, C_PANEL); t2.x = px + 12; t2.y = py + 38; g.append(t2) self.dirty = True def _close_overlay(self): self._overlay = None while len(self.g_overlay): self.g_overlay.pop() self.dirty = True def _tap_overlay(self, tx, ty): if self._overlay == 'msg': self._close_overlay(); return for x0, y0, x1, y1, act in self._ovbtns: # each action manages the panel (lane edits redraw it live) if x0 <= tx <= x1 and y0 <= ty <= y1: act(); return self._close_overlay() # tapped outside a button -> cancel / done def _handle_tap(self, tx, ty): if self._overlay: self._tap_overlay(tx, ty); return if 112 <= ty <= 126: # set-list tab line if tx > WIDTH - 56: self.toggle_continue() # right end = CONT (auto-advance) toggle else: self.switch_setlist(1) return if 128 <= ty <= 154: # track-title line if self._dirty: self._show_saverevert() return hit = self._grid_hit(tx, ty) if hit and hit[0] == 'beat': self._cycle_beat(hit[1], hit[2]); return if hit and hit[0] == 'lane': self._show_laneedit(hit[1]); return # tap the instrument name -> lane editor self._tap_log(tx, ty) # else the practice log # ---------- lane editor (tap the instrument name): sound / beats / sub / swing / mute + add / remove ---------- def _show_laneedit(self, li): self._overlay = 'lane'; self._edit_li = li; self._draw_laneedit() def _draw_laneedit(self): li = self._edit_li; L = self.lanes[li]; g = self.g_overlay while len(g): g.pop() self._ovbtns = [] PX, PY, PW, RH = 14, 54, WIDTH - 28, 34 g.append(rect(PX, PY, PW, RH * 7 + 30, C_PANEL)); g.append(rect(PX, PY, PW, 2, C_CYAN)) t, w, h = make_text("Edit lane %d of %d" % (li + 1, len(self.lanes)), FONT_S, C_MUTE, C_PANEL) t.x = PX + 12; t.y = PY + 8; g.append(t) y = [PY + 28] def vrow(label, value, fn): # label + [<] value [>]; left tap = fn(-1), right = fn(+1) yy = y[0] lt, lw, lh = make_text(label, FONT_S, C_MUTE, C_PANEL); lt.x = PX + 12; lt.y = yy + 9; g.append(lt) g.append(rect(PX + 108, yy + 3, 28, RH - 8, C_BTN)) at, aw, ah = make_text("<", FONT_M, C_CYAN, C_BTN); at.x = PX + 108 + 9; at.y = yy + 7; g.append(at) vt, vw, vh = make_text(value, FONT_M, C_TXT, C_PANEL); vt.x = PX + 146; vt.y = yy + 5; g.append(vt) g.append(rect(PX + PW - 36, yy + 3, 28, RH - 8, C_BTN)) gt, gw, gh = make_text(">", FONT_M, C_CYAN, C_BTN); gt.x = PX + PW - 36 + 9; gt.y = yy + 7; g.append(gt) self._ovbtns.append((PX + 104, yy, PX + 140, yy + RH, lambda: fn(-1))) self._ovbtns.append((PX + PW - 40, yy, PX + PW, yy + RH, lambda: fn(1))) y[0] += RH vrow("Sound", L['sound'][:9], self._edit_sound) vrow("Beats", str(sum(L['groups'])), self._edit_beats) vrow("Subdiv", str(L['sub']), self._edit_sub) vrow("Swing", "on" if L['swing'] else "off", self._edit_swing) vrow("Mute", "yes" if L['mute'] else "no", self._edit_mute) yy = y[0] + 2; bw = (PW - 36) // 2 # + Lane | Remove g.append(rect(PX + 12, yy, bw, RH - 6, C_BTN)) a, aw, ah = make_text("+ Lane", FONT_S, C_GREEN if len(self.lanes) < MAXLANES else C_DIM, C_BTN); a.x = PX + 22; a.y = yy + 8; g.append(a) self._ovbtns.append((PX + 12, yy, PX + 12 + bw, yy + RH, self._edit_add)) g.append(rect(PX + PW - 12 - bw, yy, bw, RH - 6, C_BTN)) r, rw, rh = make_text("Remove", FONT_S, C_AMBER if len(self.lanes) > 1 else C_DIM, C_BTN); r.x = PX + PW - 12 - bw + 14; r.y = yy + 8; g.append(r) self._ovbtns.append((PX + PW - 12 - bw, yy, PX + PW - 12, yy + RH, self._edit_remove)) yy += RH + 2 g.append(rect(PX + 12, yy, PW - 24, RH - 4, C_BTN)) d, dw, dh = make_text("Done", FONT_M, C_CYAN, C_BTN); d.x = PX + (PW - dw) // 2; d.y = yy + 5; g.append(d) self._ovbtns.append((PX + 12, yy, PX + PW - 12, yy + RH, self._edit_done)) self.dirty = True def _regen_levels(self, L): # default accents after a beats/sub change sub = L['sub']; groups = L['groups']; starts = set(); acc = 0 for gp in groups: starts.add(acc); acc += gp L['steps'] = sum(groups) * sub L['levels'] = [(2 if (i // sub) in starts else 1) if i % sub == 0 else 0 for i in range(L['steps'])] def _lane_dirty(self, structural): if structural: self._regen_levels(self.lanes[self._edit_li]) self.build_grid() if not self._dirty: self._dirty = True; self.draw_status() self._draw_laneedit() # refresh the modal with the new values def _edit_sound(self, d): L = self.lanes[self._edit_li]; i = SOUNDS.index(L['sound']) if L['sound'] in SOUNDS else 0 L['sound'] = SOUNDS[(i + d) % len(SOUNDS)]; self._lane_dirty(False) def _edit_beats(self, d): L = self.lanes[self._edit_li]; L['groups'] = [max(1, min(12, sum(L['groups']) + d))]; self._lane_dirty(True) def _edit_sub(self, d): L = self.lanes[self._edit_li]; L['sub'] = max(1, min(8, L['sub'] + d)); self._lane_dirty(True) def _edit_swing(self, d): L = self.lanes[self._edit_li]; L['swing'] = not L['swing']; self._lane_dirty(False) def _edit_mute(self, d): L = self.lanes[self._edit_li]; L['mute'] = not L['mute']; self._lane_dirty(False) def _edit_add(self): if len(self.lanes) >= MAXLANES: return self.lanes.insert(self._edit_li + 1, _parse_lane("beep:4")); self._edit_li += 1; self._lane_dirty(False) def _edit_remove(self): if len(self.lanes) <= 1: return del self.lanes[self._edit_li] if self._edit_li >= len(self.lanes): self._edit_li = len(self.lanes) - 1 self._lane_dirty(False) def _edit_done(self): self._close_overlay() 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 self._m_steps = 0 # restart the bar count self._seg_start = time.monotonic() # and the on-screen timer (resets with the bar counter) # ---------- audio + light ---------- def click(self, level): self.spk.frequency = {2: 2300, 1: 1600, 3: 1050}.get(level, 1600) self.spk.duty_cycle = {2: 42000, 1: 30000, 3: 14000}.get(level, 30000) self.spk_off = time.monotonic_ns() + 22_000_000 def _led_base(self): return LED_RUN if self.running else LED_IDLE # dim red while playing / dim green when stopped def flash(self, level): self.rgb = LEVEL_RGB.get(level, (0, 150, 255)) # bright beat pulse, fades back to the base in tick() self.led.set(*self.rgb) def led_rest(self): # settle to the resting colour (green idle / red running) self.rgb = self._led_base() self.led.set(*self.rgb) 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 | ((MIDI_CHANNEL - 1) & 0x0F), note, vel])) # Note On, channel 1..16 except Exception: pass # ---------- transport ---------- def toggle(self): self.running = not self.running if self.running: self._reset_clock(); self._start_play() self._clock_next = time.monotonic_ns() # start MIDI Clock Out from zero if MIDI_CLOCK_OUT and MIDI_CLOCK_OUT_TRANSPORT and self.midi is not None: try: self.midi.write(bytes([0xFA])) # Start except Exception: pass else: self.spk.duty_cycle = 0; self.reset_playheads(); self._log_play() if MIDI_CLOCK_OUT and MIDI_CLOCK_OUT_TRANSPORT and self.midi is not None: try: self.midi.write(bytes([0xFC])) # Stop except Exception: pass self.led_rest(); self.draw_meters() # LED shows run state: red running / green stopped def set_bpm(self, v): v = max(30, min(300, v)) if v != self.bpm: self.bpm = v self.draw_bpm(); self.draw_meters() # total time depends on 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() self.led_rest(); self.draw_meters() 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.spk_off and now >= self.spk_off: self.spk.duty_cycle = 0; self.spk_off = 0 if self.running: fired = [] for li, L in enumerate(self.lanes): if self._advance: break # seam armed - skip remaining lanes for THIS tick adv = False while now >= L['next']: L['step'] = (L['step'] + 1) % L['steps'] if li == 0: self._m_steps += 1 # count master-lane steps -> bars nb = self._m_steps // L['steps'] if nb != self._lastbar: self._lastbar = nb; self._on_new_bar(nb) if self._advance: break # seam armed - suppress this step's firing if self.ramp and L['steps'] > 0: # CONTINUOUS ramp: interpolate bpm at every master step mlen = L['steps'] bar_pos = self._m_steps / mlen seg_bar = (bar_pos % self.bars) if self.bars else bar_pos new_bpm = max(30, min(300, int(self._ramp_base + seg_bar / self.ramp['every'] * self.ramp['amt']))) if new_bpm != self.bpm: self.bpm = new_bpm lvl = 0 if L['mute'] else L['levels'][L['step']] if lvl > 0: fired.append(lvl) if not self._muted: # gap trainer: silent during the rest bars self.midi_send(SOUND_GM.get(L['sound'], GM_DEFAULT), MIDI_VEL.get(lvl, 90)) 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 and not self._muted: best = max(fired, key=lambda l: PRIO.get(l, 0)) if not MUTE_SPEAKER and not (SPEAKER_AUTO_MUTE and self.midi_host): self.click(best) # speaker silent if user muted it / auto-mute on + host present self.flash(best) base = self._led_base() # decay the beat pulse back down to the red running base if self.rgb != base: r = base[0] + (self.rgb[0]-base[0])*7//10 g = base[1] + (self.rgb[1]-base[1])*7//10 b = base[2] + (self.rgb[2]-base[2])*7//10 if abs(r-base[0])+abs(g-base[1])+abs(b-base[2]) < 6: r, g, b = base self.rgb = (r, g, b); self.led.set(r, g, b) if self._advance: # Continue: gapless swap to the prepared track at seam_t self._advance = False self._do_advance() # MIDI Clock Out (master): 24 PPQN; interval follows the live bpm (so continuous ramps carry through) if self.running and MIDI_CLOCK_OUT and self.midi is not None: while now >= self._clock_next: try: self.midi.write(bytes([0xF8])) except Exception: pass self._clock_next += int(60_000_000_000 / max(1, self.bpm) / 24) def _on_new_bar(self, bar): # Pre-parse the next track during the LAST bar of this segment, so the swap at the seam is allocation-free if self.bars and self.continue_on and self._next_pending is None and bar == self.bars - 1: self._prepare_next() if self.bars and bar > 0 and bar % self.bars == 0: # segment boundary self._seg_start = time.monotonic() # timer resets with the bar counter if self.continue_on and self._next_pending is not None: self._seam_t = self.lanes[0]['next'] # the wall-clock time of THIS boundary step self._advance = True # tick() will swap to the prepared track # Note: per-master-step continuous ramp handles the bpm reset implicitly (seg_bar wraps to 0) t = self.trainer # gap trainer: silence during the rest bars self._muted = bool(t and (t['play'] + t['mute']) and (bar % (t['play'] + t['mute'])) >= t['play']) def _prepare_next(self): # parse the next playlist item into a side holder items = self.setlists[self.sl]['items'] nxt = (self.idx + 1) % len(items) if nxt == self.idx: return # 1-item playlist -> just loop, no swap name, prog = items[nxt] bpm, lanes, bars, ramp, trainer = parse_program(prog) self._next_pending = {'lanes': lanes, 'bpm': bpm, 'bars': bars, 'ramp': ramp, 'trainer': trainer, 'name': name, 'idx': nxt} def _do_advance(self): # gapless seam: swap the prepared track in at seam_t n = self._next_pending if n is None: return self._next_pending = None self.lanes = n['lanes']; self.bpm = n['bpm']; self.bars = n['bars'] self.ramp = n['ramp']; self.trainer = n['trainer']; self.name = n['name']; self.idx = n['idx'] self._ramp_base = self.bpm; self._lastbar = -1; self._muted = False; self._m_steps = 0 self._dirty = False; self._overlay = None while len(self.g_overlay): self.g_overlay.pop() seam = self._seam_t for L in self.lanes: L['next'] = seam; L['step'] = -1 # NEXT tick fires step 0 of the new track at seam_t self._need_redraw = True # visuals (grid + draws) catch up on the next refresh self._seg_start = time.monotonic() # reset the on-screen timer self.led_rest() # ---------- 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 nowms = time.monotonic() if nowms >= self._touchNext: # poll touch ~30x/s (the I2C read adds loop latency -> MIDI jitter) self._touchNext = nowms + 0.033 pt = self.touch.read() if pt: self._touchSeen = nowms if not self._touchDown: self._touchDown = True; self._handle_tap(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 and SPEAKER_AUTO_MUTE: self.spk.duty_cycle = 0 # auto-mute when the computer takes over self.led_rest(); self.draw_icons() uc = bool(getattr(supervisor.runtime, "usb_connected", True)) # connected to a computer? if uc != self.usb_conn: self.usb_conn = uc; self.draw_icons() # ---------- drawing ---------- def draw_bpm(self): # lazy: skip the bitmap alloc if the displayed integer is unchanged if self.bpm == self._displayed_bpm: return self._displayed_bpm = self.bpm self._place(self.g_bpm, str(self.bpm), 0, 44, C_TXT, C_BG, FONT_L, right_edge=WIDTH-12) def draw_status(self): # set-list tab (tap=switch) + CONT toggle, above the item title sl = self.setlists[self.sl] # tab: playlist + position; muted = built-in (read-only), cyan = your own self._place(self.g_idx, "%s %d/%d" % (sl['title'][:11], self.idx + 1, len(sl['items'])), 12, 118, C_MUTE if sl['builtin'] else C_CYAN, C_BG, FONT_S) self._place(self.g_cont, "CONT", 0, 118, C_GREEN if self.continue_on else C_DIM, C_BG, FONT_S, right_edge=WIDTH-12) # title turns red when edited (tap it to save/revert) self._place(self.g_name, self.name[:20], 12, 134, C_RED if self._dirty else C_TXT, C_BG, FONT_M) def draw_train(self): # ramp + gap-trainer indicators (symbol + params), when set g = self.g_train while len(g): g.pop() x = 12; y = 100 if self.ramp: up = self.ramp['amt'] >= 0 pts = [(0, 9), (12, 9), (12, 0)] if up else [(0, 0), (0, 9), (12, 9)] # rising / falling ramp g.append(vectorio.Polygon(pixel_shader=solid(C_AMBER), points=pts, x=x, y=y)); x += 16 a = self.ramp['amt']; lbl = ("+%d" % a if a >= 0 else "%d" % a) + "/%db" % self.ramp['every'] tg, w, h = make_text(lbl, FONT_S, C_AMBER, C_BG); tg.x = x; tg.y = y; g.append(tg); x += w + 14 if self.trainer: g.append(rect(x, y, 4, 9, C_CYAN)); g.append(rect(x + 6, y, 4, 9, C_DIM)) # play | rest x += 14 tg, w, h = make_text("%d/%db" % (self.trainer['play'], self.trainer['mute']), FONT_S, C_CYAN, C_BG) tg.x = x; tg.y = y; g.append(tg) self.dirty = True def draw_icons(self): # recolor the MIDI/USB icons by state (tear-free palette swap) if self.ic_midi_pal is not None: _recolor(self.ic_midi_pal, C_GREEN if self.midi_host else C_DIM, C_BG) if self.ic_usb_pal is not None: _recolor(self.ic_usb_pal, C_CYAN if self.usb_conn else C_DIM, C_BG) self.dirty = True def _fmt_t(self, s): # m:ss, or h:mm:ss past an hour s = int(s) return "%d:%02d:%02d" % (s // 3600, (s % 3600) // 60, s % 60) if s >= 3600 else "%d:%02d" % (s // 60, s % 60) def draw_meters(self): # running time [of total] + bar [of total]; ~4x/s from run() run = self.running and self.play_start is not None mlen = self.lanes[0]['steps'] if self.lanes else 1 bpb = (self.lanes[0]['steps'] // max(1, self.lanes[0]['sub'])) if self.lanes else 4 el = (time.monotonic() - self._seg_start) if run else 0 # time within the current segment (resets with the bar) mbars = self._m_steps // max(1, mlen) # whole master bars elapsed cur = ("%d" % ((mbars % self.bars + 1) if self.bars else (mbars + 1))) if run else "-" # cycle 1..N if self.bars: # track has a length (b): show "X of TOTAL" ts = "%s of %s" % (self._fmt_t(el), self._fmt_t(self.bars * bpb * 60.0 / self.bpm)) bs = "bar %s of %d" % (cur, self.bars) else: ts = self._fmt_t(el); bs = "bar %s" % cur if ts != self._lastTs: self._place(self.g_time, ts, 12, 50, C_TXT, C_BG, FONT_M); self._lastTs = ts if bs != self._lastBs: self._place(self.g_bar, bs, 12, 78, C_MUTE, C_BG, FONT_M); self._lastBs = bs # ---------- 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 = GRID_TOP; rowh = min(40, ((LOG_TOP - 10) - top) // max(1, n)) px0 = 60; usable = WIDTH - 8 - px0 - 12; gridh = n * rowh self._grid = {'top': top, 'rowh': rowh, 'px0': px0, 'usable': usable, 'n': n} # for touch hit-testing # vertical gridlines at the master lane's beats, full height -> beats line up across lanes m = self.lanes[0]; mbeats = max(1, m['steps'] // max(1, m['sub'])) for bcol in range(mbeats): self.g_grid.append(rect(px0 + 6 + (bcol * usable) // mbeats, top, 1, gridh, C_GRID)) 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']; stepw = max(1, usable // steps) side = max(5, min(15, stepw - 1, rowh - 6)) # square edge for the main pulse rad = max(2, min(side // 2, stepw // 2 - 1)) # smaller circle for subdivisions pads = [] for s in range(steps): cxp = px0 + 6 + (s * usable) // steps # proportional -> beats line up across lanes if s % sub == 0: # main beat -> square p = vectorio.Rectangle(pixel_shader=self.pad_pal, width=side, height=side, x=cxp - side // 2, y=cy - side // 2) else: # subdivision -> circle p = vectorio.Circle(pixel_shader=self.pad_pal, radius=rad, x=cxp, y=cy) p.color_index = self._padbase(L, s); self.g_grid.append(p); pads.append(p) 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 mlen = self.lanes[0]['steps'] if self.lanes else 1 t = time.localtime() self.log.insert(0, {"t": "%02d:%02d" % (t.tm_hour, t.tm_min), "bpm": self.play_bpm, "dur": dur, "bars": self._m_steps // max(1, mlen), "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 - THIS TRACK", FONT_S, C_MUTE, C_BG); hdr.x = 10; hdr.y = LOG_TOP; g.append(hdr) rows = [(i, e) for i, e in enumerate(self.log) if e.get("name") == self.name] # current track only if not rows: tg, w, h = make_text("no plays over 5s yet", 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 k in range(min(LOG_ROWS, len(rows))): oi, e = rows[k]; armed = (oi == self._armed) # oi = index into self.log (for delete) dur = "%d:%02d" % (e["dur"] // 60, e["dur"] % 60) bars = e.get("bars", 0); bstr = (" %dbar" % bars) if bars else "" line = "%s%s %3dbpm %s%s" % ("x " if armed else "", e.get("t", "--:--"), e["bpm"], dur, bstr) 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, oi)) 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 (user playlists) pushed from the editor try: with open("/programs.json", "wb") as f: f.write(bytes(sx[2:])) self.rebuild_setlists(); self.load(0) # built-ins untouched; show the refreshed lists self._ack(True) except Exception: self._ack(False) # read-only (editor mode) etc. # A/B firmware update, sent as small flow-controlled chunks (a single huge SysEx overruns the # USB-MIDI input buffer and arrives corrupt). begin(0x21,len) -> data(0x22)* -> commit(0x23). elif cmd == 0x21: # BEGIN firmware transfer: open the .mpy staging file try: try: self._fw.close() except Exception: pass self._fw = open("/app.new", "wb"); self._ack(True) except Exception: # read-only (editor mode) / no space self._fw = None; self._ack(False) elif cmd == 0x22: # DATA: a base64 chunk (multiple of 4) -> decode -> append try: if self._fw is None or a2b_base64 is None: raise OSError() self._fw.write(a2b_base64(bytes(sx[2:]))); self._ack(True) except Exception: try: self._fw.close() except Exception: pass self._fw = None; self._ack(False) elif cmd == 0x23: # COMMIT: verify it's a CircuitPython .mpy, then A/B install try: try: self._fw.close() except Exception: pass self._fw = None; gc.collect() with open("/app.new", "rb") as f: head = f.read(2) if os.stat("/app.new")[6] < 4000 or len(head) < 2 or head[0] != 0x43 or head[1] != 0x06: try: os.remove("/app.new") # not a CircuitPython mpy v6 -> reject, keep the working build except OSError: pass self._ack(False); return try: os.remove("/app.bak") except OSError: pass os.rename("/app.mpy", "/app.bak") # current build becomes the rollback os.rename("/app.new", "/app.mpy") open("/trial", "w").close() # arm the trial; the loader reverts if it won't boot self._ack(True); time.sleep(0.4); supervisor.reload() except Exception: # catch ALL (read-only, MemoryError, ...) -> never brick self._ack(False) def _ack(self, ok): if self.midi: self.midi.write(bytes([0xF0, 0x7D, 0x7F if ok else 0x7E, 0xF7])) 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 self._need_redraw: # post-seam: visuals catch up AFTER the audio swap self._need_redraw = False self.draw_bpm(); self.draw_status(); self.draw_train() self.build_grid(); self.draw_log(); self.draw_meters() tnow = time.monotonic() if tnow >= self._uiNext: # ~4x/s: tick the stopwatch + bar counter self._uiNext = tnow + 0.25; self.draw_meters(); self.draw_bpm() # bpm follows the continuous ramp if not committed and tnow - boot > 5: # booted & ran fine for 5s -> confirm the update try: os.remove("/trial") except Exception: pass committed = True # Refresh at most ~30x/s. display.refresh() BLOCKS while it streams pixels over SPI, which # would otherwise delay the next beat's MIDI note and make the audio stutter; throttling it # keeps the click timing tight (the visuals lag a few ms, which is imperceptible). if self.dirty and tnow >= self._refreshNext: if self.display.refresh(): self.dirty = False self._refreshNext = tnow + 0.033 time.sleep(0.0005) App().run()