Add "storage mode" to protect EPDs (lowest button while booting)

src/lib/config.cpp

@@ -31,6 +31,16 @@ void setup()
     }
   }
 
+  {
+    if (mcp1.digitalRead(0) == LOW)
+    {
+      // Then loop forever to prevent anything else from writing to the screen
+      while (true) {
+        delay(1000);
+      }
+    }
+  }
+
   tryImprovSetup();
 
   setupWebserver();

src/lib/epd.cpp

@@ -155,7 +155,19 @@ void setupDisplays()
                 11, &tasks[i]); // create task
   }
 
+  // Hold lower button to enable "storage mode" (prevents burn-in of ePaper displays)
+  if (mcp1.digitalRead(0) == LOW)
+  {
+    setFgColor(GxEPD_BLACK);
+    setBgColor(GxEPD_WHITE);
+
+    epdContent = {" ", " ", " ", " ", " ", " ", " "};
+  }
+  else
+  {
+
     epdContent = {"B", "T", "C", "L", "O", "C", "K"};
+  }
 
   setEpdContent(epdContent);
 }
@@ -247,7 +259,6 @@ void prepareDisplayUpdateTask(void *pvParameters)
 
           showDigit(epdIndex, epdContent[epdIndex].c_str()[0], updatePartial,
                     &FONT_BIG);
-          
         }
       }