Fixed clear and add alerts

Alerts.cpp

@@ -22,23 +22,29 @@ namespace alerts {
 	}
 
 	void add(uint8_t mask) {
-		if (!mask) return; //save a write to eeprom if there is no change
-
 		config_t* config = &config::main::value;
-		config->activeAlerts |= mask;
+		uint8_t active = config->activeAlerts;
+
+		active |= mask;
+		if (config->activeAlerts == active) return; //save a write to eeprom if there is no change
+
+		config->activeAlerts = active;
 		config::main::save();
 	}
 
 	void clear(PositionEntryMetadata &metadata) {
 		config_t* config = &config::main::value;
 		uint8_t clearMask = 0;
+		uint8_t active = config->activeAlerts;
 
 		if (metadata.batteryLevel >= config->alertBatteryLevelClear) clearMask |= _BV(ALERT_BATTERY_LEVEL_1) | _BV(ALERT_BATTERY_LEVEL_2);
 		if (metadata.temperature != ALERT_SUSPICIOUS_RTC_TEMPERATURE) bitSet(clearMask, ALERT_RTC_TEMPERATURE_FAILURE);
 		if (rtc::isAccurate()) bitSet(clearMask, ALERT_RTC_CLOCK_FAILURE);
 
-		if (!config->activeAlerts || !clearMask) return; //save a write to eeprom if there is no change
-		config->activeAlerts &= ~clearMask;
+		active &= ~clearMask;
+		if (config->activeAlerts == active) return; //save a write to eeprom if there is no change
+
+		config->activeAlerts = active;
 		config::main::save();
 	}
 }