Function pollUSB

firmware/src/main.cpp:381–424

        _display.Init(shouldFullResetDisplay, &globalState.currentHeader);

        if(wasHibernating){
            if(alarmWasSet){
                logl("woke up due to alarm");
                
                if(power::USBConnected() == false){
                    // we woke up from our regular scheduled minute alarm. Do the normal routine and go back to sleep.
                    globalState.lastDeepWakeupCause = DeepWakeupCause::Alarm;
                    globalState.sleepIndicator = true;
                    
                    if(!displayingColdWarningScreen)
                        loadClimateDate();  

                    // if temperature dropped while night mode was active, clear the night mode flag
                    if(displayCold && globalState.currentHeader.displayingNightMode)
                        globalState.currentHeader.displayingNightMode = false;

                    // night screen: suppress display updates during configured night hours
                    if(!displayCold && globalState.currentSettings.nightScreen && isNightHours(globalState.currentTime)){
                        if(globalState.currentHeader.displayingNightMode){
                            // night screen already showing — skip display update, just record data and sleep
                            doAlarmRoutine(false);
                        } else {
                            // first entry into night mode — show night screen and persist the flag
                            app.setState(State::NightMode);
                            globalState.currentHeader.displayingNightMode = true;
                            doAlarmRoutine(true);
                        }
                        // unreachable: doAlarmRoutine calls HibernateSystem
                    }

                    bool shouldUpdateDisplay = !displayingColdWarningScreen;
                    if(shouldUpdateDisplay){
                        uint8_t intervalMinutes = 1;
                        switch(globalState.currentSettings.refreshInterval){
                            case RefreshInterval::_5Minutes:  intervalMinutes = 5;  break;
                            case RefreshInterval::_10Minutes: intervalMinutes = 10; break;
                            default: break;
                        }
                        shouldUpdateDisplay = (globalState.currentTime.Minute % intervalMinutes == 0);
                    }
                    doAlarmRoutine(shouldUpdateDisplay);
                    
                    // unreachable code due to deep sleep
                    return;
                }
                else if (
                    globalState.currentHeader.shutDownReason != ShutDownReason::FirmwareUpdate &&