Merge branch 'master' into 2264-feature-check-for-low-heap-before-adding-to-nodedb-was-reboot-loop-heap-too-low

src/Power.cpp

@@ -160,8 +160,18 @@ class AnalogBatteryLevel : public HasBatteryLevel
 
     /// If we see a battery voltage higher than physics allows - assume charger is pumping
     /// in power
+    /// On some boards we don't have the power management chip (like AXPxxxx)
+    /// so we use EXT_PWR_DETECT GPIO pin to detect external power source
     virtual bool isVbusIn() override
     {
+#ifdef EXT_PWR_DETECT
+        // if external powered that pin will be pulled up
+        if (digitalRead(EXT_PWR_DETECT) == HIGH) {
+            return true;
+        }
+        // if it's not HIGH - check the battery
+#endif
+
         return getBattVoltage() > chargingVolt;
     }
 
@@ -208,6 +218,10 @@ Power::Power() : OSThread("Power")
 
 bool Power::analogInit()
 {
+#ifdef EXT_PWR_DETECT
+    pinMode(EXT_PWR_DETECT, INPUT);
+#endif
+
 #ifdef BATTERY_PIN
     LOG_DEBUG("Using analog input %d for battery level\n", BATTERY_PIN);