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feat(power): battery saving — hardware duty-cycle RX + adaptive TX power

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Two independent, default-off toggles under Settings › Radio.

Pwr save: hardware RX duty-cycle (SX126x SetRxDutyCycle via
startReceiveDutyCycleAuto). The chip cycles RX↔sleep and wakes on a preamble —
no MCU state machine; recvRaw reads the packet exactly as in continuous RX.
Falls back to continuous RX on non-SX126x. (Replaces an earlier software-CAD
state machine that fought the hardware: polling a warm-sleeping chip gave a
phantom-busy channel that stalled TX ~4 s and dropped ACKs in the scan gaps.)

Auto pwr: Adaptive Power Control. tx_power_dbm becomes a ceiling; actual TX
power tracks the reverse-link SNR margin (measured above the per-SF demod floor,
EWMA-smoothed, proportional step with a deadband). Feedback comes from direct /
room-server ACKs and, for channels (no ACK), from hearing a repeater rebroadcast
our own flood; a lost confirmation ramps power back up so channel sends can't get
stranded below what the repeaters can hear.

Prefs schema 0xC0DE0009 (rx_powersave, tx_apc). Radio page / name bar show the
live TX power; noise floor reads n/a while duty-cycling.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Jakub
2026-06-11 08:15:42 +02:00
co-authored by Claude Opus 4.8
parent baaac3179c
commit 5b58049139
13 changed files with 346 additions and 42 deletions
Download Patch File Download Diff File Expand all files Collapse all files
examples/companion_radio/ui-new/SettingsScreen.h
+22
View File
@@ -54,6 +54,8 @@ class SettingsScreen : public UIScreen {
// Radio section
SECTION_RADIO,
TX_POWER,
POWER_SAVE,
TX_APC,
// System section
SECTION_SYSTEM,
TIMEZONE,
@@ -479,6 +481,14 @@ class SettingsScreen : public UIScreen {
snprintf(buf, sizeof(buf),"%ddBm", p ? p->tx_power_dbm : 0);
display.setCursor(display.valCol(), y);
display.print(buf);
} else if (item == POWER_SAVE) {
display.print("Pwr save");
display.setCursor(display.valCol(), y);
display.print((p && p->rx_powersave) ? "ON" : "OFF");
} else if (item == TX_APC) {
display.print("Auto pwr");
display.setCursor(display.valCol(), y);
display.print((p && p->tx_apc) ? "ON" : "OFF");
#if AUTO_OFF_MILLIS > 0
} else if (item == AUTO_OFF) {
display.print("AutoOff");
@@ -736,6 +746,18 @@ public:
if (right && p->tx_power_dbm < 22) { p->tx_power_dbm++; _task->applyTxPower(); _dirty = true; return true; }
if (left && p->tx_power_dbm > 2) { p->tx_power_dbm--; _task->applyTxPower(); _dirty = true; return true; }
}
if (_selected == POWER_SAVE && p && (left || right || enter)) {
p->rx_powersave ^= 1;
_task->applyPowerSave();
_dirty = true;
return true;
}
if (_selected == TX_APC && p && (left || right || enter)) {
p->tx_apc ^= 1;
_task->applyApc();
_dirty = true;
return true;
}
#if AUTO_OFF_MILLIS > 0
if (_selected == AUTO_OFF && p) {
int idx = autoOffIndex();