Feature: Turn off Display before reboot

Thanks for the idea to @StefanOberhumer
This prevents always on Display if the device profile does not contain Display pins anymore after the reboot

include/Display_Graphic.h

@@ -19,6 +19,7 @@ public:
     void init(DisplayType_t type, uint8_t data, uint8_t clk, uint8_t cs, uint8_t reset);
     void loop();
     void setContrast(uint8_t contrast);
+    void setStatus(bool turnOn);
     void setOrientation(uint8_t rotation = DISPLAY_ROTATION);
     void setLanguage(uint8_t language);
     void setStartupDisplay();
@@ -33,6 +34,8 @@ private:
 
     U8G2* _display;
 
+    bool _displayTurnedOn;
+
     DisplayType_t _display_type = DisplayType_t::None;
     uint8_t _display_language = DISPLAY_LANGUAGE;
     uint8_t _mExtra;

src/Display_Graphic.cpp

@@ -47,6 +47,7 @@ void DisplayGraphicClass::init(DisplayType_t type, uint8_t data, uint8_t clk, ui
         _display = constructor(reset, clk, data, cs);
         _display->begin();
         setContrast(DISPLAY_CONTRAST);
+        setStatus(true);
     }
 }
 
@@ -139,10 +140,11 @@ void DisplayGraphicClass::loop()
     if ((millis() - _lastDisplayUpdate) > _period) {
 
         _display->clearBuffer();
+        bool displayPowerSave = false;
 
         //=====> Actual Production ==========
         if (Datastore.getIsAtLeastOneReachable()) {
-            _display->setPowerSave(false);
+            displayPowerSave = false;
             if (Datastore.getTotalAcPowerEnabled() > 999) {
                 snprintf(_fmtText, sizeof(_fmtText), i18n_current_power_kw[_display_language], (Datastore.getTotalAcPowerEnabled() / 1000));
             } else {
@@ -158,7 +160,7 @@ void DisplayGraphicClass::loop()
             printText(i18n_offline[_display_language], 0);
             // check if it's time to enter power saving mode
             if (millis() - _previousMillis >= (_interval * 2)) {
-                _display->setPowerSave(enablePowerSafe);
+                displayPowerSave = enablePowerSafe;
             }
         }
         //<=======================
@@ -184,6 +186,12 @@ void DisplayGraphicClass::loop()
 
         _mExtra++;
         _lastDisplayUpdate = millis();
+
+        if (!_displayTurnedOn) {
+            displayPowerSave = true;
+        }
+
+        _display->setPowerSave(displayPowerSave);
     }
 }
 
@@ -195,4 +203,9 @@ void DisplayGraphicClass::setContrast(uint8_t contrast)
     _display->setContrast(contrast * 2.55f);
 }
 
+void DisplayGraphicClass::setStatus(bool turnOn)
+{
+    _displayTurnedOn = turnOn;
+}
+
 DisplayGraphicClass Display;

src/Utils.cpp

@@ -3,6 +3,7 @@
  * Copyright (C) 2022 - 2023 Thomas Basler and others
  */
 #include "Utils.h"
+#include "Display_Graphic.h"
 #include "Led_Single.h"
 #include <Esp.h>
 
@@ -58,6 +59,7 @@ int Utils::getTimezoneOffset()
 void Utils::restartDtu()
 {
     LedSingle.turnAllOff();
+    Display.setStatus(false);
     yield();
     delay(1000);
     yield();