Async full-refresh for EInkDynamicDisplay

src/graphics/EInkDisplay2.cpp

@@ -71,28 +71,24 @@ bool EInkDisplay::forceDisplay(uint32_t msecLimit)
         }
     }
 
+    // Trigger the refresh in GxEPD2
     LOG_DEBUG("Updating E-Paper... ");
-
-#if false
-    // Currently unused; rescued from commented-out line during a refactor
-    // Use a meaningful macro here if variant doesn't want fast refresh
-
-    // Full update mode (slow)
-    adafruitDisplay->display(false)
-#else
-    // Fast update mode
     adafruitDisplay->nextPage();
-#endif
 
-    // Power off display hardware
-    // Most models: deep sleep.
-    // Wireless Paper V1.1: power off only. Deep sleep clears memory - problems with fast refresh
-    adafruitDisplay->hibernate();
+    // End the update process
+    endUpdate();
 
     LOG_DEBUG("done\n");
     return true;
 }
 
+// End the update process - virtual method, overriden in derived class
+void EInkDisplay::endUpdate()
+{
+    // Power off display hardware, then deep-sleep (Except Wireless Paper V1.1, no deep-sleep)
+    adafruitDisplay->hibernate();
+}
+
 // Write the buffer to the display memory
 void EInkDisplay::display(void)
 {
@@ -193,6 +189,7 @@ bool EInkDisplay::connect()
         // Init GxEPD2
         adafruitDisplay->init();
         adafruitDisplay->setRotation(3);
+        adafruitDisplay->clearScreen(); // Clearing now, so the boot logo will draw nice and smoothe (fast refresh)
     }
 #elif defined(PCA10059)
     {