Merge branch 'master' into 4bpp_rotation

Author: QingWind6

Extensions/EPaper.cpp

@@ -142,7 +142,9 @@ void EPaper::wake()
     if(!_grayLevel)
         EPD_WAKEUP();
     else
+#ifdef USE_MUTIGRAY_EPAPER  
         EPD_WAKEUP_GRAY();
+#endif
     _sleep = false;
 }