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nrf52: turn off BLE connection LED before SYSTEMOFF 🤖🤖 #2662

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nrf52: turn off BLE connection LED before SYSTEMOFF 🤖🤖 #2662

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12 changes: 12 additions & 0 deletions src/helpers/NRF52Board.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -156,6 +156,18 @@ void NRF52Board::enterSystemOff(uint8_t reason) {
NRF_POWER->GPREGRET2 = reason;
}

// Turn off the BLE connection LED before deep sleep. Bluefruit's autoConnLed
// (on by default) drives LED_CONN; nRF52 SYSTEMOFF only halts the core and
// leaves GPIO outputs latched in their last state, so the LED would otherwise
// stay lit through hibernation. Stop BLE re-driving the pin, then pull it low.
if (sd_enabled) {
Bluefruit.autoConnLed(false); // stop BLE re-driving the LED
Bluefruit.Advertising.stop(); // stop advertising + its blink timer
}
#if defined(LED_CONN) && (LED_CONN >= 0)
ledOff(LED_CONN); // polarity-aware (respects LED_STATE_ON)
#endif

// Flush serial buffers
Serial.flush();
delay(100);
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