david/uno-q-audio-synth
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Author SHA1 Message Date
david 8e82286287 synth-diagnostic starts pipeline services, cleans up on failure 
- run-tests.sh: starts pipeline services, runs test-unit.py,
  stops services on failure, leaves running on success
- synth-diagnostic is the single gate for pipeline startup
- deploy: stop pipeline → restart prometheus → start synth-diagnostic
  (synth-diagnostic starts pipeline on success)
 2026-06-24 02:49:58 -07:00
david b445c272fb add boot-time synth-diagnostic.service 
- synth-diagnostic.service: runs test-unit.py before pipeline services
- Type=oneshot, After=prometheus-exporter, Before=pipeline services
- Pipeline services: After=synth-diagnostic
- deploy: restart prometheus-exporter → start synth-diagnostic → restart pipeline
- install.sh: includes synth-diagnostic in SERVICES array
 2026-06-24 02:48:40 -07:00
david 2e10839fc9 add diagnostic dashboard served from prometheus-exporter 
- dashboard.html: standalone HTML, fetches :9090/metrics, auto-refresh
- Exporter serves dashboard at /dashboard and /dashboard.html
- Cards: Pipeline, Audio, Mixer, MIDI Bridge, LED Viz
- Live gauges, counters, service status dots, last-activity timestamps
 2026-06-24 02:43:31 -07:00
david 74e0d3fa03 fix: use threading.Lock() instead of object() for _stats_lock 2026-06-24 02:42:06 -07:00
david f673da4b3b merge midi metrics into prometheus-exporter 
midi-bridge: removed HTTP server on :9091, now writes /tmp/midi-stats.json
prometheus-exporter: reads /tmp/midi-stats.json, exposes all metrics on :9090/metrics
Single scrape endpoint for all pipeline components
 2026-06-24 02:41:27 -07:00
david 7706517b88 fix: initialize stats_last_write inside main() to avoid UnboundLocalError 2026-06-24 02:39:37 -07:00
david ad55dbc5e0 add viz diagnostic metrics to prometheus-exporter 
- Viz writes stats to /tmp/viz-stats.json (frames_sent, frames_dropped, queue_depth)
- Exporter reads viz-stats.json and exposes:
  - viz_frames_sent_total (counter)
  - viz_frames_dropped_total (counter)
  - viz_pending_queue (gauge)
  - viz_queue_full (gauge)
 2026-06-24 02:38:51 -07:00
david 5c95aa6cd0 viz: proper POLLOUT queue to prevent frame drops 
- FrameQueue (max 5) buffers frames when router is slow
- POLLOUT drains pending_frames queue
- No silent drops — full queue increments counter
- Router always registered POLLIN| POLLOUT
- Frame interval 30ms (33 FPS)
 2026-06-24 02:37:46 -07:00
david 272a13f8d9 viz: increase FPS to 30, drain UDP aggressively 
- Poll timeout capped at 10ms for responsiveness
- Drain all pending UDP data before parsing
- Auto-reconnect router on error
- FPS 15 -> 30
 2026-06-24 02:33:17 -07:00
david caef6f04c8 midi-bridge: add prometheus metrics on :9091/metrics 
- midi_messages_total: all MIDI messages
- midi_notes_on/off_total: note-on/off counts
- midi_last_status/note/velocity: last message tokens
- midi_last_time_unix: epoch of last message
- Removed MIDI counters from prometheus-exporter (bridge owns them)
 2026-06-24 02:25:31 -07:00
david 163ad4145b add prometheus exporter + test suite 
- prometheus-exporter.py: stdlib-only HTTP metrics on :9090/metrics
- Exposes: ALSA status, hw_ptr rate, service health, mixer controls
- MIDI counters: notes_on, notes_off, errors
- test-unit.py: 10-test suite covering full MIDI→Pd→Audio pipeline
- test-tone.pd, test-midi-log.pd: minimal debug patches
- systemd service for exporter
- install.sh/deploy updated to include exporter
 2026-06-24 02:22:05 -07:00
david 3cc497f632 refactor: 3-module pd architecture + viz non-blocking fix 
- midi-in.pd: netreceive -> route -> unpack -> pitch/velocity outlets
- audio-out.pd: inlet~ -> dac~ abstraction
- synth.pd: consumer patch wiring midi-in -> voice -> audio-out
- led-matrix-viz.py: router socket non-blocking, registered with poller
- pd.rego: skip outlet/abstraction false positives in validation
 2026-06-24 02:08:57 -07:00
david 242c74236f systemd services: midi-bridge, pd-synth-onboard, led-matrix-viz + install script 2026-06-24 01:36:36 -07:00
david f919af3d8b midi-bridge: normalize all MIDI channels to channel 1 2026-06-24 00:50:39 -07:00
david ed8cb7ca5a working synth: two detuned oscs, env~, lop~ (no slider for now) 2026-06-24 00:45:37 -07:00
david ccc40e4314 rebuild synth.pd from working components 2026-06-23 22:17:02 -07:00
david e098f32a32 fix synth: envelope driven by velocity not pitch, louder gain 2026-06-23 21:58:10 -07:00
david 7e8848d23c justfile: git-based deploy, streamlined recipes 2026-06-23 21:29:16 -07:00
david d239d58c44 onboard audio: JMISC HPH wiring, UCM fix, update scripts for git deploy 2026-06-23 21:25:51 -07:00
david a135dc4452 controller.pd: add MIDI passthrough for MPK Mini → board 
Added notein→pack→noteout and ctlin→ctlout chains that forward all
incoming MIDI from the MPK Mini to the board's MIDI port. This means
physical keys/knobs now work alongside the GUI click buttons.
 2026-06-23 14:44:05 -07:00
david 334e934dd7 stabilize systemd services: fix races, masked flooding, dependencies 
- pd-synth: add After=usb-gadget-audio.service midi-bridge.service (was Wants= only, race)
- usb-gadget-audio: add Restart=on-failure After=sysinit.target
- pd-synth-i2s: fix Wants=configure-usb-audio.service → usb-gadget-audio.service
- detect-usb-role.sh: hardcode gadget role (all 4 detection methods always fail, skip 2s sleep)
- arduino-router-serial: masked on board (flooded 2173× restarts looking for nonexistent /dev/ttyGS0)
 2026-06-23 14:31:11 -07:00
david f1b65eb4d9 fix led-matrix-viz: use select.poll() instead of settimeout, fix hang 
The O_NONBLOCK flag set by setblocking(False) was not cleared by
settimeout(n) on this CPython/kernel combo, causing recvfrom to never
return data. Switched to explicit select.poll() with frame-interval
based timeout — simpler, more portable, and avoids the O_NONBLOCK trap.

Also fixes midi-bridge: add time.sleep(0.01) in no-data paths to
prevent 100% CPU spin from spurious POLLIN on f_midi rawmidi.
 2026-06-23 00:34:33 -07:00
david dbd7c2cece auto-detect MIDI device, drop ALSA sequencer dependency, MPK Mini simulator 
midi-bridge.py:
  - Auto-detect rawmidi device (gadget f_midi > env override > fallback)
  - Reconnect on ENODEV (device hotplug)
  - No longer needs MIDI_BRIDGE_DEV env var in common cases

start-synth.sh:
  - Remove all -alsamidi/-midiadddev flags (kernel lacks CONFIG_SND_SEQUENCER)
  - MIDI handled entirely by midi-bridge.service → UDP → netreceive
  - Host mode: same approach, no ALSA sequencer needed

mpk-mini-sim.pd:
  - New MPK Mini Mk II simulator (25 keys, 8 pads, 8 CC knobs)
  - Proper Pd #X obj format for all objects (bng, hsl, t, del, netsend, loadbang)
  - UDP output to board:8081, matching midi-bridge format

system: enable usb-gadget-audio.service at boot, load dwc3 module at boot
 2026-06-22 23:10:38 -07:00
david 8cd796e3dd 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