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feat(power): CAD-windowed receive (battery saver) — phase 1

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Add an optional low-power RX mode: instead of listening continuously, the
radio periodically runs a Channel Activity Detection scan and sits in standby
between scans; on detected activity it drops into a full receive to catch the
packet. Cuts average RX current several-fold (the dominant draw on this node).

- RadioLibWrapper: CAD state machine (scan → sleep window → rx) driven from
  loop(), which runs before recvRaw each cycle. `state` stays STATE_RX through
  all phases so the dispatcher's not-in-RX watchdog never trips. Re-arm routes
  through armRecv() in both startRecv() and recvRaw(); toggling on/off switches
  mode safely at the next idle. Falls back to continuous RX if CAD is
  unsupported. setPowerSaving()/getPowerSaving() control it.
- Software CSMA is already disabled on this firmware (interference threshold 0),
  so duty-cycling doesn't affect listen-before-talk; airtime budget still gates
  TX, and isReceivingPacket() still defers TX while a packet is mid-air.
- Companion: new rx_powersave pref (schema 0xC0DE0008), Settings › Radio ›
  "Pwr save" toggle, applied at boot (MyMesh) and on change (UITask).

CAD window = 45 ms (< the 16-symbol preamble at SF8/BW62.5) and CAD params use
RadioLib defaults — both will want on-hardware tuning + a before/after current
measurement to confirm reception is intact.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Jakub
2026-06-04 18:54:52 +02:00
parent baaac3179c
commit 90ca21432c
8 changed files with 141 additions and 9 deletions
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8
examples/companion_radio/DataStore.cpp
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@@ -323,14 +323,15 @@ void DataStore::loadPrefsInt(const char *filename, NodePrefs& _prefs, double& no
rd(&_prefs.units_imperial, sizeof(_prefs.units_imperial));
rd(&_prefs.trail_show_pace, sizeof(_prefs.trail_show_pace));
rd(&_prefs.advert_sound_scope, sizeof(_prefs.advert_sound_scope));
// These fields were appended after ch_fav_only; an older file can leave
// stray bytes here (the old tail sentinel gets partly consumed), so clamp
// out-of-range values back to defaults.
rd(&_prefs.rx_powersave, sizeof(_prefs.rx_powersave));
// These fields were appended over successive schema bumps; an older file
// can leave stray bytes here, so clamp out-of-range values back to defaults.
// Values for notif_melody_ad: 0=built-in, 1=melody1, 2=melody2, 3=none.
if (_prefs.notif_melody_ad > 3) _prefs.notif_melody_ad = 0;
if (_prefs.units_imperial > 1) _prefs.units_imperial = 0;
if (_prefs.trail_show_pace > 1) _prefs.trail_show_pace = 0;
if (_prefs.advert_sound_scope > 1) _prefs.advert_sound_scope = ADVERT_SOUND_SCOPE_ALL;
if (_prefs.rx_powersave > 1) _prefs.rx_powersave = 0;
// Schema sentinel: bumped on layout changes. Mismatch means an older file
// (or a different schema); rd() already zero-inits any fields not present,
@@ -450,6 +451,7 @@ void DataStore::savePrefs(const NodePrefs& _prefs, double node_lat, double node_
file.write((uint8_t *)&_prefs.units_imperial, sizeof(_prefs.units_imperial));
file.write((uint8_t *)&_prefs.trail_show_pace, sizeof(_prefs.trail_show_pace));
file.write((uint8_t *)&_prefs.advert_sound_scope, sizeof(_prefs.advert_sound_scope));
file.write((uint8_t *)&_prefs.rx_powersave, sizeof(_prefs.rx_powersave));
// Tail sentinel — must be last. See NodePrefs::SCHEMA_SENTINEL.
uint32_t sentinel = NodePrefs::SCHEMA_SENTINEL;