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NRF52 - power management improvements (#9211)

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* minor NRF52 test cleanup

* detect USB power input on ProMicro boards

* prevent booting on power failure detection

* introduce PowerHAL layer

* powerHAL basic implementation for NRF52

* prevent data saves on low power

* remove comment

* Update src/platform/nrf52/main-nrf52.cpp

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Update src/power/PowerHAL.h

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Update src/main.cpp

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Merge missing voltage threshold comparison

* add missing variable

* add missing function declaration

* remove debug strings

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: Ben Meadors <benmmeadors@gmail.com>
This commit is contained in:
phaseloop
2026-01-24 16:39:03 +02:00
committed by GitHub
parent 6cff13623f
commit 57a3ff8dfc
7 changed files with 384 additions and 113 deletions
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46
src/main.cpp
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@@ -10,6 +10,7 @@
#include "ReliableRouter.h"
#include "airtime.h"
#include "buzz.h"
#include "power/PowerHAL.h"
#include "FSCommon.h"
#include "Led.h"
@@ -332,6 +333,43 @@ __attribute__((weak, noinline)) bool loopCanSleep()
void lateInitVariant() __attribute__((weak));
void lateInitVariant() {}
// NRF52 (and probably other platforms) can report when system is in power failure mode
// (eg. too low battery voltage) and operating it is unsafe (data corruption, bootloops, etc).
// For example NRF52 will prevent any flash writes in that case automatically
// (but it causes issues we need to handle).
// This detection is independent from whatever ADC or dividers used in Meshtastic
// boards and is internal to chip.
// we use powerHAL layer to get this info and delay booting until power level is safe
// wait until power level is safe to continue booting (to avoid bootloops)
// blink user led in 3 flashes sequence to indicate what is happening
void waitUntilPowerLevelSafe()
{
#ifdef LED_PIN
pinMode(LED_PIN, OUTPUT);
#endif
while (powerHAL_isPowerLevelSafe() == false) {
#ifdef LED_PIN
// 3x: blink for 300 ms, pause for 300 ms
for (int i = 0; i < 3; i++) {
digitalWrite(LED_PIN, LED_STATE_ON);
delay(300);
digitalWrite(LED_PIN, LED_STATE_OFF);
delay(300);
}
#endif
// sleep for 2s
delay(2000);
}
}
/**
* Print info as a structured log message (for automated log processing)
*/
@@ -342,6 +380,14 @@ void printInfo()
#ifndef PIO_UNIT_TESTING
void setup()
{
// initialize power HAL layer as early as possible
powerHAL_init();
// prevent booting if device is in power failure mode
// boot sequence will follow when battery level raises to safe mode
waitUntilPowerLevelSafe();
#if defined(R1_NEO)
pinMode(DCDC_EN_HOLD, OUTPUT);
digitalWrite(DCDC_EN_HOLD, HIGH);