Adds the ding sound effect that fires on speed-limit changes / cruise-
warning transitions (writers will set ClearpilotPlayDing="1" in
/dev/shm/params; soundd polls at ~2Hz, clears the flag, plays once).
The ding plays at MAX_VOLUME independent of the alert volume map and
mixes into the same output stream. Single-shot — no looping. Loaded
once at startup; failure to load just disables the ding (rest of soundd
keeps working).
print-to-stderr, not cloudlog (CLAUDE.md rule).
Restoring the working tree to the pristine pre-Claude baseline previously
preserved at /data/clearpilot (now /data/clearpilot-baseline). The prior
modified-but-broken tree is snapshotted at /data/openpilot-broken-2026-05-03
and tagged here as pre-reset-2026-05-03 for reference.
From here, features (UI changes, dashcam, telemetry, GPS, display modes,
speed logic, standstill power saving, etc.) will be re-introduced one at
a time with proper testing.
Plays a ding via soundd when the cruise warning sign becomes visible
(cruise set speed out of range vs speed limit) or when the speed limit
changes while the warning sign is already showing. Max 1 ding per 30s.
Ding is mixed independently into soundd output at max volume without
interrupting alert sounds. bench_cmd ding available for manual trigger.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
brianhansonxyz