Initial commit: Arduino Uno Q USB Audio Synth project

- USB gadget (UAC1 + MIDI) with boot persistence - USB host mode with auto-detection - Pure Data synth patch with ALSA + UDP netreceive MIDI input - MIDI rawmidi-to-UDP bridge (midi-bridge.py) - LED matrix visualization (led-matrix-viz.py via arduino-router RPC) - MCU sketch for LED matrix control (Arduino_RouterBridge + ArduinoGraphics) - Conftest/OPA Rego policy validation suite for .pd files - gen_synth_pd.py: programmatic .pd file generator - System services: midi-bridge, led-matrix-viz, pd-synth-auto, usb-role-detect - Justfile with deploy, enable, diagnostic recipes - Diagnostic script (diag.sh)
2026-06-22 22:46:36 -07:00
commit 8cd796e3dd
38 changed files with 2681 additions and 0 deletions
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+#!/usr/bin/env python3
+"""Generate synth.pd programmatically."""
+from pathlib import Path
+
+SCRIPT_DIR = Path(__file__).resolve().parent
+OUTPUT = SCRIPT_DIR.parent / "pd" / "synth.pd"
+
+def connect(c, src, sout, dst, din):
+    c.append((src, sout, dst, din))
+
+def obj(o, x, y, *args):
+    idx = len(o)
+    o.append((x, y, "obj", *args))
+    return idx
+
+def gen():
+    o = []  # objects
+    c = []  # connections
+
+    def Obj(x, y, *args):
+        return obj(o, x, y, *args)
+
+    # ── ALSA MIDI input (gadget mode) ──
+    notein = Obj(20, 20, "notein")
+    pack_note = Obj(80, 50, "pack 0 0")
+    unpack_note = Obj(80, 80, "unpack 0 0")
+    s_pitch_n = Obj(20, 110, "s midi-pitch")
+    s_vel_n = Obj(80, 110, "s midi-vel")
+    connect(c, notein, 0, pack_note, 0)
+    connect(c, notein, 1, pack_note, 1)
+    connect(c, pack_note, 0, unpack_note, 0)
+    connect(c, unpack_note, 0, s_pitch_n, 0)
+    connect(c, unpack_note, 1, s_vel_n, 0)
+
+    # ── UDP MIDI input (host mode via midi-bridge) ──
+    net = Obj(400, 20, "netreceive -u 8081")
+    route_midi = Obj(400, 60, "route midi")
+    route_note = Obj(400, 100, "route 144 128")
+    unpack2_on = Obj(400, 140, "unpack 0 0")
+    unpack2_off = Obj(480, 140, "unpack 0 0")
+    s_pitch_u = Obj(400, 180, "s midi-pitch")
+    s_vel_u = Obj(480, 180, "s midi-vel")
+    connect(c, net, 0, route_midi, 0)
+    connect(c, route_midi, 0, route_note, 0)
+    connect(c, route_note, 0, unpack2_on, 0)
+    connect(c, route_note, 1, unpack2_off, 0)
+    connect(c, unpack2_on, 0, s_pitch_u, 0)
+    connect(c, unpack2_on, 1, s_vel_u, 0)
+    connect(c, unpack2_off, 0, s_pitch_u, 0)
+    connect(c, unpack2_off, 1, s_vel_u, 0)
+
+    # ── Synth voice ──
+    r_vel = Obj(20, 160, "r midi-vel")
+    r_pitch = Obj(20, 190, "r midi-pitch")
+    strip = Obj(20, 220, "stripnote")
+    mtof = Obj(20, 260, "mtof")
+    env = Obj(20, 290, "env~ 50 200 0.7 400")
+    osc1 = Obj(140, 260, "osc~")
+    mul1 = Obj(140, 290, "*~ 0.3")
+    osc2 = Obj(220, 260, "osc~")
+    mul2 = Obj(220, 290, "*~ 0.3")
+    sum = Obj(180, 330, "+~")
+    scale = Obj(180, 360, "*~ 0.5")
+    filt = Obj(180, 400, "lop~")
+    amp = Obj(180, 460, "*~")
+    panscale = Obj(320, 460, "*~")
+    dac = Obj(250, 530, "dac~")
+
+    connect(c, r_vel, 0, strip, 1)
+    connect(c, r_pitch, 0, strip, 0)
+    connect(c, strip, 0, mtof, 0)
+    connect(c, mtof, 0, osc1, 0)
+    connect(c, mtof, 0, osc2, 0)
+    connect(c, osc1, 0, mul1, 0)
+    connect(c, osc2, 0, mul2, 0)
+    connect(c, mul1, 0, sum, 0)
+    connect(c, mul2, 0, sum, 1)
+    connect(c, sum, 0, scale, 0)
+    connect(c, scale, 0, filt, 0)
+    connect(c, filt, 0, amp, 0)
+    connect(c, strip, 0, env, 0)
+    connect(c, env, 0, amp, 1)
+    connect(c, amp, 0, panscale, 0)
+
+    # ── Controls ──
+    cutoff = Obj(350, 330, "hsl 128 15 100 18000 10000 0 0 0 empty Cutoff -2 -8 0 10 -262144 -1 -1 7200 1")
+    volume = Obj(350, 430, "hsl 128 15 0 100 40 0 0 0 empty Volume -2 -8 0 10 -262144 -1 -1 7200 1")
+    div = Obj(350, 460, "/ 100")
+    connect(c, cutoff, 0, filt, 1)
+    connect(c, volume, 0, div, 0)
+    connect(c, div, 0, panscale, 1)
+
+    # ── Output ──
+    connect(c, panscale, 0, dac, 0)
+    connect(c, panscale, 0, dac, 1)
+
+    # ── Write ──
+    lines = ["#N canvas 0 0 900 550 10;"]
+    for x, y, t, *args in o:
+        joined = " ".join(str(a) for a in args)
+        lines.append(f"#X obj {x} {y} {joined};")
+    for src, sout, dst, din in c:
+        lines.append(f"#X connect {src} {sout} {dst} {din};")
+    lines.append("")
+    return "\n".join(lines)
+
+if __name__ == "__main__":
+    content = gen()
+    OUTPUT.parent.mkdir(parents=True, exist_ok=True)
+    OUTPUT.write_text(content)
+    print(f"Wrote {OUTPUT}")
+    # Print connections for debugging
+    for line in content.splitlines():
+        if line.startswith("#X connect"):
+            print(f"  {line}")