diff --git a/Marlin/Configuration.h b/Marlin/Configuration.h
index 9067655033..126fdc0893 100644
--- a/Marlin/Configuration.h
+++ b/Marlin/Configuration.h
@@ -1513,7 +1513,18 @@
// RepRapDiscount FULL GRAPHIC Smart Controller
// http://reprap.org/wiki/RepRapDiscount_Full_Graphic_Smart_Controller
//
+// If USE_ST7920_LIGHTWEIGHT_UI is uncommented, then an alternative
+// light-weight status screen will be used that takes advantage of
+// the ST7920 character-generator to conserve MCU resources.
+//
+// Since the lightweight status screen can only show a status
+// message or the position, but not both, set DELAY_TO_SHOW_POSITION
+// to the number of seconds until the position is revealed after a new
+// status message is drawn.
+
//#define REPRAP_DISCOUNT_FULL_GRAPHIC_SMART_CONTROLLER
+//#define USE_ST7920_LIGHTWEIGHT_UI
+//#define DELAY_TO_SHOW_POSITION 20
//
// MakerLab Mini Panel with graphic
diff --git a/Marlin/src/config/default/Configuration.h b/Marlin/src/config/default/Configuration.h
index 9067655033..126fdc0893 100644
--- a/Marlin/src/config/default/Configuration.h
+++ b/Marlin/src/config/default/Configuration.h
@@ -1513,7 +1513,18 @@
// RepRapDiscount FULL GRAPHIC Smart Controller
// http://reprap.org/wiki/RepRapDiscount_Full_Graphic_Smart_Controller
//
+// If USE_ST7920_LIGHTWEIGHT_UI is uncommented, then an alternative
+// light-weight status screen will be used that takes advantage of
+// the ST7920 character-generator to conserve MCU resources.
+//
+// Since the lightweight status screen can only show a status
+// message or the position, but not both, set DELAY_TO_SHOW_POSITION
+// to the number of seconds until the position is revealed after a new
+// status message is drawn.
+
//#define REPRAP_DISCOUNT_FULL_GRAPHIC_SMART_CONTROLLER
+//#define USE_ST7920_LIGHTWEIGHT_UI
+//#define DELAY_TO_SHOW_POSITION 20
//
// MakerLab Mini Panel with graphic
diff --git a/Marlin/src/config/examples/AliExpress/CL-260/Configuration.h b/Marlin/src/config/examples/AliExpress/CL-260/Configuration.h
index 629a2373ab..56ae68867c 100644
--- a/Marlin/src/config/examples/AliExpress/CL-260/Configuration.h
+++ b/Marlin/src/config/examples/AliExpress/CL-260/Configuration.h
@@ -1513,7 +1513,18 @@
// RepRapDiscount FULL GRAPHIC Smart Controller
// http://reprap.org/wiki/RepRapDiscount_Full_Graphic_Smart_Controller
//
+// If USE_ST7920_LIGHTWEIGHT_UI is uncommented, then an alternative
+// light-weight status screen will be used that takes advantage of
+// the ST7920 character-generator to conserve MCU resources.
+//
+// Since the lightweight status screen can only show a status
+// message or the position, but not both, set DELAY_TO_SHOW_POSITION
+// to the number of seconds until the position is revealed after a new
+// status message is drawn.
+
//#define REPRAP_DISCOUNT_FULL_GRAPHIC_SMART_CONTROLLER
+//#define USE_ST7920_LIGHTWEIGHT_UI
+//#define DELAY_TO_SHOW_POSITION 20
//
// MakerLab Mini Panel with graphic
diff --git a/Marlin/src/config/examples/Anet/A6/Configuration.h b/Marlin/src/config/examples/Anet/A6/Configuration.h
index 2a4365b245..e1c3ac694e 100644
--- a/Marlin/src/config/examples/Anet/A6/Configuration.h
+++ b/Marlin/src/config/examples/Anet/A6/Configuration.h
@@ -1661,9 +1661,18 @@
// RepRapDiscount FULL GRAPHIC Smart Controller
// http://reprap.org/wiki/RepRapDiscount_Full_Graphic_Smart_Controller
//
-// Note: Details on connecting to the Anet V1.0 controller are in the file pins_ANET_10.h
+// If USE_ST7920_LIGHTWEIGHT_UI is uncommented, then an alternative
+// light-weight status screen will be used that takes advantage of
+// the ST7920 character-generator to conserve MCU resources.
//
+// Since the lightweight status screen can only show a status
+// message or the position, but not both, set DELAY_TO_SHOW_POSITION
+// to the number of seconds until the position is revealed after a new
+// status message is drawn.
+
//#define REPRAP_DISCOUNT_FULL_GRAPHIC_SMART_CONTROLLER
+//#define USE_ST7920_LIGHTWEIGHT_UI
+//#define DELAY_TO_SHOW_POSITION 20
//
// MakerLab Mini Panel with graphic
diff --git a/Marlin/src/config/examples/Anet/A8/Configuration.h b/Marlin/src/config/examples/Anet/A8/Configuration.h
index 21f94a4ae2..b303b158f5 100644
--- a/Marlin/src/config/examples/Anet/A8/Configuration.h
+++ b/Marlin/src/config/examples/Anet/A8/Configuration.h
@@ -1516,6 +1516,7 @@
//
//#define G3D_PANEL
+
//
// RepRapDiscount FULL GRAPHIC Smart Controller
// http://reprap.org/wiki/RepRapDiscount_Full_Graphic_Smart_Controller
@@ -1524,6 +1525,18 @@
//
//#define REPRAP_DISCOUNT_FULL_GRAPHIC_SMART_CONTROLLER
+// If USE_ST7920_LIGHTWEIGHT_UI is uncommented, then an alternative
+// light-weight status screen will be used that takes advantage of
+// the ST7920 character-generator to conserve MCU resources.
+//
+// Since the lightweight status screen can only show a status
+// message or the position, but not both, set DELAY_TO_SHOW_POSITION
+// to the number of seconds until the position is revealed after a new
+// status message is drawn.
+
+//#define USE_ST7920_LIGHTWEIGHT_UI
+//#define DELAY_TO_SHOW_POSITION 20
+
//
// MakerLab Mini Panel with graphic
// controller and SD support - http://reprap.org/wiki/Mini_panel
diff --git a/Marlin/src/config/examples/BIBO/TouchX/cyclops/Configuration.h b/Marlin/src/config/examples/BIBO/TouchX/cyclops/Configuration.h
index b8712d93e6..0df6282363 100644
--- a/Marlin/src/config/examples/BIBO/TouchX/cyclops/Configuration.h
+++ b/Marlin/src/config/examples/BIBO/TouchX/cyclops/Configuration.h
@@ -1513,7 +1513,18 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = true; // set to true to invert the lo
// RepRapDiscount FULL GRAPHIC Smart Controller
// http://reprap.org/wiki/RepRapDiscount_Full_Graphic_Smart_Controller
//
+// If USE_ST7920_LIGHTWEIGHT_UI is uncommented, then an alternative
+// light-weight status screen will be used that takes advantage of
+// the ST7920 character-generator to conserve MCU resources.
+//
+// Since the lightweight status screen can only show a status
+// message or the position, but not both, set DELAY_TO_SHOW_POSITION
+// to the number of seconds until the position is revealed after a new
+// status message is drawn.
+
#define REPRAP_DISCOUNT_FULL_GRAPHIC_SMART_CONTROLLER
+//#define USE_ST7920_LIGHTWEIGHT_UI
+//#define DELAY_TO_SHOW_POSITION 20
//
// MakerLab Mini Panel with graphic
diff --git a/Marlin/src/config/examples/BIBO/TouchX/default/Configuration.h b/Marlin/src/config/examples/BIBO/TouchX/default/Configuration.h
index 0c3da39401..ca6c4ca7ca 100644
--- a/Marlin/src/config/examples/BIBO/TouchX/default/Configuration.h
+++ b/Marlin/src/config/examples/BIBO/TouchX/default/Configuration.h
@@ -1513,7 +1513,18 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = true; // set to true to invert the lo
// RepRapDiscount FULL GRAPHIC Smart Controller
// http://reprap.org/wiki/RepRapDiscount_Full_Graphic_Smart_Controller
//
+// If USE_ST7920_LIGHTWEIGHT_UI is uncommented, then an alternative
+// light-weight status screen will be used that takes advantage of
+// the ST7920 character-generator to conserve MCU resources.
+//
+// Since the lightweight status screen can only show a status
+// message or the position, but not both, set DELAY_TO_SHOW_POSITION
+// to the number of seconds until the position is revealed after a new
+// status message is drawn.
+
#define REPRAP_DISCOUNT_FULL_GRAPHIC_SMART_CONTROLLER
+//#define USE_ST7920_LIGHTWEIGHT_UI
+//#define DELAY_TO_SHOW_POSITION 20
//
// MakerLab Mini Panel with graphic
diff --git a/Marlin/src/config/examples/FolgerTech/i3-2020/Configuration.h b/Marlin/src/config/examples/FolgerTech/i3-2020/Configuration.h
index 35f1f85855..2848e71fe1 100644
--- a/Marlin/src/config/examples/FolgerTech/i3-2020/Configuration.h
+++ b/Marlin/src/config/examples/FolgerTech/i3-2020/Configuration.h
@@ -1519,7 +1519,18 @@
// RepRapDiscount FULL GRAPHIC Smart Controller
// http://reprap.org/wiki/RepRapDiscount_Full_Graphic_Smart_Controller
//
+// If USE_ST7920_LIGHTWEIGHT_UI is uncommented, then an alternative
+// light-weight status screen will be used that takes advantage of
+// the ST7920 character-generator to conserve MCU resources.
+//
+// Since the lightweight status screen can only show a status
+// message or the position, but not both, set DELAY_TO_SHOW_POSITION
+// to the number of seconds until the position is revealed after a new
+// status message is drawn.
+
//#define REPRAP_DISCOUNT_FULL_GRAPHIC_SMART_CONTROLLER
+//#define USE_ST7920_LIGHTWEIGHT_UI
+//#define DELAY_TO_SHOW_POSITION 20
//
// MakerLab Mini Panel with graphic
diff --git a/Marlin/src/config/examples/Infitary/i3-M508/Configuration.h b/Marlin/src/config/examples/Infitary/i3-M508/Configuration.h
index 555e22fe13..77bd20aa60 100644
--- a/Marlin/src/config/examples/Infitary/i3-M508/Configuration.h
+++ b/Marlin/src/config/examples/Infitary/i3-M508/Configuration.h
@@ -1517,7 +1517,18 @@
// RepRapDiscount FULL GRAPHIC Smart Controller
// http://reprap.org/wiki/RepRapDiscount_Full_Graphic_Smart_Controller
//
+// If USE_ST7920_LIGHTWEIGHT_UI is uncommented, then an alternative
+// light-weight status screen will be used that takes advantage of
+// the ST7920 character-generator to conserve MCU resources.
+//
+// Since the lightweight status screen can only show a status
+// message or the position, but not both, set DELAY_TO_SHOW_POSITION
+// to the number of seconds until the position is revealed after a new
+// status message is drawn.
+
//#define REPRAP_DISCOUNT_FULL_GRAPHIC_SMART_CONTROLLER
+//#define USE_ST7920_LIGHTWEIGHT_UI
+//#define DELAY_TO_SHOW_POSITION 20
//
// MakerLab Mini Panel with graphic
diff --git a/Marlin/src/config/examples/JGAurora/A5/Configuration.h b/Marlin/src/config/examples/JGAurora/A5/Configuration.h
index 077733ca92..ce0d3e69b7 100644
--- a/Marlin/src/config/examples/JGAurora/A5/Configuration.h
+++ b/Marlin/src/config/examples/JGAurora/A5/Configuration.h
@@ -1524,7 +1524,18 @@
// RepRapDiscount FULL GRAPHIC Smart Controller
// http://reprap.org/wiki/RepRapDiscount_Full_Graphic_Smart_Controller
//
+// If USE_ST7920_LIGHTWEIGHT_UI is uncommented, then an alternative
+// light-weight status screen will be used that takes advantage of
+// the ST7920 character-generator to conserve MCU resources.
+//
+// Since the lightweight status screen can only show a status
+// message or the position, but not both, set DELAY_TO_SHOW_POSITION
+// to the number of seconds until the position is revealed after a new
+// status message is drawn.
+
//#define REPRAP_DISCOUNT_FULL_GRAPHIC_SMART_CONTROLLER
+//#define USE_ST7920_LIGHTWEIGHT_UI
+//#define DELAY_TO_SHOW_POSITION 20
//
// MakerLab Mini Panel with graphic
diff --git a/Marlin/src/config/examples/RigidBot/Configuration.h b/Marlin/src/config/examples/RigidBot/Configuration.h
index 376c949770..09d4837c51 100644
--- a/Marlin/src/config/examples/RigidBot/Configuration.h
+++ b/Marlin/src/config/examples/RigidBot/Configuration.h
@@ -1515,6 +1515,18 @@
//
//#define REPRAP_DISCOUNT_FULL_GRAPHIC_SMART_CONTROLLER
+// If USE_ST7920_LIGHTWEIGHT_UI is uncommented, then an alternative
+// light-weight status screen will be used that takes advantage of
+// the ST7920 character-generator to conserve MCU resources.
+//
+// Since the lightweight status screen can only show a status
+// message or the position, but not both, set DELAY_TO_SHOW_POSITION
+// to the number of seconds until the position is revealed after a new
+// status message is drawn.
+
+//#define USE_ST7920_LIGHTWEIGHT_UI
+//#define DELAY_TO_SHOW_POSITION 20
+
//
// MakerLab Mini Panel with graphic
// controller and SD support - http://reprap.org/wiki/Mini_panel
diff --git a/Marlin/src/config/examples/STM32F10/Configuration.h b/Marlin/src/config/examples/STM32F10/Configuration.h
index affc796675..04282211bb 100644
--- a/Marlin/src/config/examples/STM32F10/Configuration.h
+++ b/Marlin/src/config/examples/STM32F10/Configuration.h
@@ -1516,7 +1516,18 @@
// RepRapDiscount FULL GRAPHIC Smart Controller
// http://reprap.org/wiki/RepRapDiscount_Full_Graphic_Smart_Controller
//
+// If USE_ST7920_LIGHTWEIGHT_UI is uncommented, then an alternative
+// light-weight status screen will be used that takes advantage of
+// the ST7920 character-generator to conserve MCU resources.
+//
+// Since the lightweight status screen can only show a status
+// message or the position, but not both, set DELAY_TO_SHOW_POSITION
+// to the number of seconds until the position is revealed after a new
+// status message is drawn.
+
//#define REPRAP_DISCOUNT_FULL_GRAPHIC_SMART_CONTROLLER
+//#define USE_ST7920_LIGHTWEIGHT_UI
+//#define DELAY_TO_SHOW_POSITION 20
//
// MakerLab Mini Panel with graphic
diff --git a/Marlin/src/config/examples/Sanguinololu/Configuration.h b/Marlin/src/config/examples/Sanguinololu/Configuration.h
index 239cf8d654..40d6d4c9f7 100644
--- a/Marlin/src/config/examples/Sanguinololu/Configuration.h
+++ b/Marlin/src/config/examples/Sanguinololu/Configuration.h
@@ -1544,7 +1544,18 @@
// RepRapDiscount FULL GRAPHIC Smart Controller
// http://reprap.org/wiki/RepRapDiscount_Full_Graphic_Smart_Controller
//
+// If USE_ST7920_LIGHTWEIGHT_UI is uncommented, then an alternative
+// light-weight status screen will be used that takes advantage of
+// the ST7920 character-generator to conserve MCU resources.
+//
+// Since the lightweight status screen can only show a status
+// message or the position, but not both, set DELAY_TO_SHOW_POSITION
+// to the number of seconds until the position is revealed after a new
+// status message is drawn.
+
//#define REPRAP_DISCOUNT_FULL_GRAPHIC_SMART_CONTROLLER
+//#define USE_ST7920_LIGHTWEIGHT_UI
+//#define DELAY_TO_SHOW_POSITION 20
//
// MakerLab Mini Panel with graphic
diff --git a/Marlin/src/config/examples/Tronxy/X1/Configuration.h b/Marlin/src/config/examples/Tronxy/X1/Configuration.h
index e74543b69a..3e65542997 100644
--- a/Marlin/src/config/examples/Tronxy/X1/Configuration.h
+++ b/Marlin/src/config/examples/Tronxy/X1/Configuration.h
@@ -1498,7 +1498,18 @@
// RepRapDiscount FULL GRAPHIC Smart Controller
// http://reprap.org/wiki/RepRapDiscount_Full_Graphic_Smart_Controller
//
+// If USE_ST7920_LIGHTWEIGHT_UI is uncommented, then an alternative
+// light-weight status screen will be used that takes advantage of
+// the ST7920 character-generator to conserve MCU resources.
+//
+// Since the lightweight status screen can only show a status
+// message or the position, but not both, set DELAY_TO_SHOW_POSITION
+// to the number of seconds until the position is revealed after a new
+// status message is drawn.
+
//#define REPRAP_DISCOUNT_FULL_GRAPHIC_SMART_CONTROLLER
+//#define USE_ST7920_LIGHTWEIGHT_UI
+//#define DELAY_TO_SHOW_POSITION 20
//
// MakerLab Mini Panel with graphic
diff --git a/Marlin/src/config/examples/Tronxy/X5S/Configuration.h b/Marlin/src/config/examples/Tronxy/X5S/Configuration.h
index 38a6a31d10..aa562a5a55 100644
--- a/Marlin/src/config/examples/Tronxy/X5S/Configuration.h
+++ b/Marlin/src/config/examples/Tronxy/X5S/Configuration.h
@@ -1513,7 +1513,18 @@
// RepRapDiscount FULL GRAPHIC Smart Controller
// http://reprap.org/wiki/RepRapDiscount_Full_Graphic_Smart_Controller
//
+// If USE_ST7920_LIGHTWEIGHT_UI is uncommented, then an alternative
+// light-weight status screen will be used that takes advantage of
+// the ST7920 character-generator to conserve MCU resources.
+//
+// Since the lightweight status screen can only show a status
+// message or the position, but not both, set DELAY_TO_SHOW_POSITION
+// to the number of seconds until the position is revealed after a new
+// status message is drawn.
+
#define REPRAP_DISCOUNT_FULL_GRAPHIC_SMART_CONTROLLER
+//#define USE_ST7920_LIGHTWEIGHT_UI
+//#define DELAY_TO_SHOW_POSITION 20
//
// MakerLab Mini Panel with graphic
diff --git a/Marlin/src/config/examples/Velleman/K8200/Configuration.h b/Marlin/src/config/examples/Velleman/K8200/Configuration.h
index ecc36d7175..108ee285e5 100644
--- a/Marlin/src/config/examples/Velleman/K8200/Configuration.h
+++ b/Marlin/src/config/examples/Velleman/K8200/Configuration.h
@@ -1546,7 +1546,18 @@
// RepRapDiscount FULL GRAPHIC Smart Controller
// http://reprap.org/wiki/RepRapDiscount_Full_Graphic_Smart_Controller
//
+// If USE_ST7920_LIGHTWEIGHT_UI is uncommented, then an alternative
+// light-weight status screen will be used that takes advantage of
+// the ST7920 character-generator to conserve MCU resources.
+//
+// Since the lightweight status screen can only show a status
+// message or the position, but not both, set DELAY_TO_SHOW_POSITION
+// to the number of seconds until the position is revealed after a new
+// status message is drawn.
+
//#define REPRAP_DISCOUNT_FULL_GRAPHIC_SMART_CONTROLLER
+//#define USE_ST7920_LIGHTWEIGHT_UI
+//#define DELAY_TO_SHOW_POSITION 20
//
// MakerLab Mini Panel with graphic
diff --git a/Marlin/src/config/examples/Velleman/K8400/Configuration.h b/Marlin/src/config/examples/Velleman/K8400/Configuration.h
index 5e6092b26a..7d5038c78d 100644
--- a/Marlin/src/config/examples/Velleman/K8400/Configuration.h
+++ b/Marlin/src/config/examples/Velleman/K8400/Configuration.h
@@ -1513,7 +1513,18 @@
// RepRapDiscount FULL GRAPHIC Smart Controller
// http://reprap.org/wiki/RepRapDiscount_Full_Graphic_Smart_Controller
//
+// If USE_ST7920_LIGHTWEIGHT_UI is uncommented, then an alternative
+// light-weight status screen will be used that takes advantage of
+// the ST7920 character-generator to conserve MCU resources.
+//
+// Since the lightweight status screen can only show a status
+// message or the position, but not both, set DELAY_TO_SHOW_POSITION
+// to the number of seconds until the position is revealed after a new
+// status message is drawn.
+
//#define REPRAP_DISCOUNT_FULL_GRAPHIC_SMART_CONTROLLER
+//#define USE_ST7920_LIGHTWEIGHT_UI
+//#define DELAY_TO_SHOW_POSITION 20
//
// MakerLab Mini Panel with graphic
diff --git a/Marlin/src/config/examples/Velleman/K8400/Dual-head/Configuration.h b/Marlin/src/config/examples/Velleman/K8400/Dual-head/Configuration.h
index 2e0c436c23..662b1ba1cc 100644
--- a/Marlin/src/config/examples/Velleman/K8400/Dual-head/Configuration.h
+++ b/Marlin/src/config/examples/Velleman/K8400/Dual-head/Configuration.h
@@ -1507,7 +1507,18 @@
// RepRapDiscount FULL GRAPHIC Smart Controller
// http://reprap.org/wiki/RepRapDiscount_Full_Graphic_Smart_Controller
//
+// If USE_ST7920_LIGHTWEIGHT_UI is uncommented, then an alternative
+// light-weight status screen will be used that takes advantage of
+// the ST7920 character-generator to conserve MCU resources.
+//
+// Since the lightweight status screen can only show a status
+// message or the position, but not both, set DELAY_TO_SHOW_POSITION
+// to the number of seconds until the position is revealed after a new
+// status message is drawn.
+
//#define REPRAP_DISCOUNT_FULL_GRAPHIC_SMART_CONTROLLER
+//#define USE_ST7920_LIGHTWEIGHT_UI
+//#define DELAY_TO_SHOW_POSITION 20
//
// MakerLab Mini Panel with graphic
diff --git a/Marlin/src/config/examples/delta/kossel_mini/Configuration.h b/Marlin/src/config/examples/delta/kossel_mini/Configuration.h
index 6ebfebf86c..976a2bac4e 100644
--- a/Marlin/src/config/examples/delta/kossel_mini/Configuration.h
+++ b/Marlin/src/config/examples/delta/kossel_mini/Configuration.h
@@ -1637,7 +1637,18 @@
// RepRapDiscount FULL GRAPHIC Smart Controller
// http://reprap.org/wiki/RepRapDiscount_Full_Graphic_Smart_Controller
//
+// If USE_ST7920_LIGHTWEIGHT_UI is uncommented, then an alternative
+// light-weight status screen will be used that takes advantage of
+// the ST7920 character-generator to conserve MCU resources.
+//
+// Since the lightweight status screen can only show a status
+// message or the position, but not both, set DELAY_TO_SHOW_POSITION
+// to the number of seconds until the position is revealed after a new
+// status message is drawn.
+
//#define REPRAP_DISCOUNT_FULL_GRAPHIC_SMART_CONTROLLER
+//#define USE_ST7920_LIGHTWEIGHT_UI
+//#define DELAY_TO_SHOW_POSITION 20
//
// MakerLab Mini Panel with graphic
diff --git a/Marlin/src/config/examples/gCreate/gMax1.5+/Configuration.h b/Marlin/src/config/examples/gCreate/gMax1.5+/Configuration.h
index 9053afb07c..d52ab8a2f8 100644
--- a/Marlin/src/config/examples/gCreate/gMax1.5+/Configuration.h
+++ b/Marlin/src/config/examples/gCreate/gMax1.5+/Configuration.h
@@ -1527,7 +1527,18 @@
// RepRapDiscount FULL GRAPHIC Smart Controller
// http://reprap.org/wiki/RepRapDiscount_Full_Graphic_Smart_Controller
//
+// If USE_ST7920_LIGHTWEIGHT_UI is uncommented, then an alternative
+// light-weight status screen will be used that takes advantage of
+// the ST7920 character-generator to conserve MCU resources.
+//
+// Since the lightweight status screen can only show a status
+// message or the position, but not both, set DELAY_TO_SHOW_POSITION
+// to the number of seconds until the position is revealed after a new
+// status message is drawn.
+
#define REPRAP_DISCOUNT_FULL_GRAPHIC_SMART_CONTROLLER
+//#define USE_ST7920_LIGHTWEIGHT_UI
+//#define DELAY_TO_SHOW_POSITION 20
//
// MakerLab Mini Panel with graphic
diff --git a/Marlin/src/config/examples/makibox/Configuration.h b/Marlin/src/config/examples/makibox/Configuration.h
index d063628ea2..6ec77ec43c 100644
--- a/Marlin/src/config/examples/makibox/Configuration.h
+++ b/Marlin/src/config/examples/makibox/Configuration.h
@@ -1516,7 +1516,18 @@
// RepRapDiscount FULL GRAPHIC Smart Controller
// http://reprap.org/wiki/RepRapDiscount_Full_Graphic_Smart_Controller
//
+// If USE_ST7920_LIGHTWEIGHT_UI is uncommented, then an alternative
+// light-weight status screen will be used that takes advantage of
+// the ST7920 character-generator to conserve MCU resources.
+//
+// Since the lightweight status screen can only show a status
+// message or the position, but not both, set DELAY_TO_SHOW_POSITION
+// to the number of seconds until the position is revealed after a new
+// status message is drawn.
+
//#define REPRAP_DISCOUNT_FULL_GRAPHIC_SMART_CONTROLLER
+//#define USE_ST7920_LIGHTWEIGHT_UI
+//#define DELAY_TO_SHOW_POSITION 20
//
// MakerLab Mini Panel with graphic
diff --git a/Marlin/src/lcd/dogm/ultralcd_impl_st7920_lite_status_screen.h b/Marlin/src/lcd/dogm/ultralcd_impl_st7920_lite_status_screen.h
new file mode 100644
index 0000000000..dd3c71a1e3
--- /dev/null
+++ b/Marlin/src/lcd/dogm/ultralcd_impl_st7920_lite_status_screen.h
@@ -0,0 +1,247 @@
+/*
+ * Lightweight Status Screen for the RepRapDiscount Full
+ * Graphics Smart Controller (ST7920-based 128x64 LCD)
+ *
+ * (c) 2017 Aleph Objects, Inc.
+ *
+ * The code in this page is free software: you can
+ * redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GNU GPL) as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option)
+ * any later version. The code is distributed WITHOUT ANY WARRANTY;
+ * without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU GPL for more details.
+ *
+ */
+
+#ifndef ULTRALCD_ST7920_LITE_STATUS_H
+#define ULTRALCD_ST7920_LITE_STATUS_H
+
+class ST7920_Lite_Status_Screen {
+ private:
+ static struct st7920_state_t {
+ uint8_t synced : 1; // Whether a sync has been sent
+ uint8_t cmd : 1; // Whether the sync was cmd or data
+ uint8_t extended : 1;
+ uint8_t graphics : 1;
+ uint8_t sa : 1;
+ } current_bits;
+
+ static void cs();
+ static void ncs();
+ static void sync_cmd();
+ static void sync_dat();
+ static void write_byte(uint8_t w);
+
+ static void cmd(uint8_t cmd);
+ static void begin_data();
+ static void write_word(uint16_t w);
+ static void write_str(const char *str);
+ static void write_str(const char *str, uint8_t len);
+ static void write_str_P(const char *str);
+ static void write_str(progmem_str str);
+ static void write_number(uint8_t value, uint8_t digits=3);
+
+ static void _extended_function_set(bool extended, bool graphics);
+ static void _scroll_or_addr_select(bool sa);
+ static void reset_state_from_unknown();
+
+ static void home();
+ static void display_status(bool display_on, bool cursor_on, bool blink_on);
+ static void extended_function_set(bool extended);
+ static void graphics(bool graphics);
+ static void entry_mode_select(bool ac_increase, bool shift);
+ static void scroll_or_addr_select(bool sa);
+ static void set_ddram_address(uint8_t addr);
+ static void set_cgram_address(uint8_t addr);
+ static void set_gdram_address(uint8_t x, uint8_t y);
+
+ static void clear();
+ static void clear_ddram();
+ static void clear_gdram();
+
+ static void load_cgram_icon(uint16_t addr, const void *data);
+ static void draw_gdram_icon(uint8_t x, uint8_t y, const void *data);
+
+ static uint8_t string_checksum(const char *str);
+
+ protected:
+ static void draw_static_elements();
+ static void draw_progress_bar(uint8_t value);
+ static void draw_fan_icon(bool whichIcon);
+ static void draw_heat_icon(bool whichIcon, bool heating);
+ static void draw_extruder_1_temp(uint8_t temp, uint8_t target);
+ static void draw_extruder_2_temp(uint8_t temp, uint8_t target);
+ static void draw_bed_temp(uint8_t temp, uint8_t target);
+ static void draw_fan_speed(uint8_t value);
+ static void draw_print_time(uint32_t elapsed);
+ static void draw_feedrate_percentage(uint8_t percentage);
+ static void draw_status_message(const char *str);
+ static void draw_position(const float x, const float y, const float z, bool position_known = true);
+
+ static bool indicators_changed();
+ static bool position_changed();
+ static bool blink_changed();
+ static bool status_changed();
+
+ static void update_indicators(bool forceUpdate);
+ static void update_position(bool forceUpdate, bool resetChecksum);
+ static void update_status_or_position(bool forceUpdate);
+ static void update_progress(bool forceUpdate);
+
+ public:
+ static void update(bool forceUpdate);
+ static void on_entry();
+ static void on_exit();
+ static void clear_text_buffer();
+};
+
+/************************** ICON DEFINITIONS *************************************/
+
+#define CGRAM_ICON_1_ADDR 0x00
+#define CGRAM_ICON_2_ADDR 0x10
+#define CGRAM_ICON_3_ADDR 0x20
+#define CGRAM_ICON_4_ADDR 0x30
+
+#define CGRAM_ICON_1_WORD 0x00
+#define CGRAM_ICON_2_WORD 0x02
+#define CGRAM_ICON_3_WORD 0x04
+#define CGRAM_ICON_4_WORD 0x06
+
+PROGMEM const uint16_t nozzle_icon[] = {
+ 0b0000000000000000,
+ 0b0000000000000000,
+ 0b0000111111110000,
+ 0b0001111111111000,
+ 0b0001111111111000,
+ 0b0001111111111000,
+ 0b0000111111110000,
+ 0b0000111111110000,
+ 0b0001111111111000,
+ 0b0001111111111000,
+ 0b0001111111111000,
+ 0b0000011111100000,
+ 0b0000001111000000,
+ 0b0000000110000000,
+ 0b0000000000000000,
+ 0b0000000000000000
+};
+
+PROGMEM const uint16_t bed_icon[] = {
+ 0b0000000000000000,
+ 0b0000000000000000,
+ 0b0000000000000000,
+ 0b0000000000000000,
+ 0b0000000000000000,
+ 0b0000000000000000,
+ 0b0000000000000000,
+ 0b0000000000000000,
+ 0b0000000000000000,
+ 0b0000000000000000,
+ 0b0000000000000000,
+ 0b0000000000000000,
+ 0b0111111111111110,
+ 0b0111111111111110,
+ 0b0000000000000000,
+ 0b0000000000000000
+};
+
+PROGMEM const uint16_t heat1_icon[] = {
+ 0b0000000000000000,
+ 0b0000000000000000,
+ 0b0010001000100000,
+ 0b0001000100010000,
+ 0b0000100010001000,
+ 0b0000100010001000,
+ 0b0001000100010000,
+ 0b0010001000100000,
+ 0b0010001000100000,
+ 0b0001000100010000,
+ 0b0000100010001000,
+ 0b0000000000000000,
+ 0b0000000000000000,
+ 0b0000000000000000,
+ 0b0000000000000000,
+ 0b0000000000000000
+};
+
+PROGMEM const uint16_t heat2_icon[] = {
+ 0b0000000000000000,
+ 0b0000000000000000,
+ 0b0000100010001000,
+ 0b0000100010001000,
+ 0b0001000100010000,
+ 0b0010001000100000,
+ 0b0010001000100000,
+ 0b0001000100010000,
+ 0b0000100010001000,
+ 0b0000100010001000,
+ 0b0001000100010000,
+ 0b0000000000000000,
+ 0b0000000000000000,
+ 0b0000000000000000,
+ 0b0000000000000000,
+ 0b0000000000000000
+};
+
+PROGMEM const uint16_t fan1_icon[] = {
+ 0b0000000000000000,
+ 0b0111111111111110,
+ 0b0111000000001110,
+ 0b0110001111000110,
+ 0b0100001111000010,
+ 0b0100000110000010,
+ 0b0101100000011010,
+ 0b0101110110111010,
+ 0b0101100000011010,
+ 0b0100000110000010,
+ 0b0100001111000010,
+ 0b0110001111000110,
+ 0b0111000000001110,
+ 0b0111111111111110,
+ 0b0000000000000000,
+ 0b0000000000000000
+};
+
+PROGMEM const uint16_t fan2_icon[] = {
+ 0b0000000000000000,
+ 0b0111111111111110,
+ 0b0111000000001110,
+ 0b0110010000100110,
+ 0b0100111001110010,
+ 0b0101111001111010,
+ 0b0100110000110010,
+ 0b0100000110000010,
+ 0b0100110000110010,
+ 0b0101111001111010,
+ 0b0100111001110010,
+ 0b0110010000100110,
+ 0b0111000000001110,
+ 0b0111111111111110,
+ 0b0000000000000000,
+ 0b0000000000000000
+};
+
+PROGMEM const uint16_t feedrate_icon[] = {
+ 0b0000000000000000,
+ 0b0111111000000000,
+ 0b0100000000000000,
+ 0b0100000000000000,
+ 0b0100000000000000,
+ 0b0111111011111000,
+ 0b0100000010000100,
+ 0b0100000010000100,
+ 0b0100000010000100,
+ 0b0100000011111000,
+ 0b0000000010001000,
+ 0b0000000010000100,
+ 0b0000000010000100,
+ 0b0000000010000010,
+ 0b0000000000000000,
+ 0b0000000000000000
+};
+
+static void lcd_implementation_status_screen();
+static void lcd_in_status(bool inStatus);
+
+#endif // ULTRALCD_ST7920_LITE_STATUS_H
\ No newline at end of file
diff --git a/Marlin/src/lcd/dogm/ultralcd_impl_st7920_lite_status_screen_impl.h b/Marlin/src/lcd/dogm/ultralcd_impl_st7920_lite_status_screen_impl.h
new file mode 100644
index 0000000000..db66fc12fc
--- /dev/null
+++ b/Marlin/src/lcd/dogm/ultralcd_impl_st7920_lite_status_screen_impl.h
@@ -0,0 +1,757 @@
+/*
+ * Lightweight Status Screen for the RepRapDiscount Full
+ * Graphics Smart Controller (ST7920-based 128x64 LCD)
+ *
+ * (c) 2017 Aleph Objects, Inc.
+ *
+ * The code in this page is free software: you can
+ * redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GNU GPL) as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option)
+ * any later version. The code is distributed WITHOUT ANY WARRANTY;
+ * without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU GPL for more details.
+ *
+ */
+
+ /* This is an implementation of a status screen for the RepRapDiscount
+ * Full Graphics Smart Controller using native ST7920 commands rather
+ * than using U8Glib.
+ *
+ * This alternative status screen makes use of the built-in character
+ * generation capabilities of the ST7920 to update the status screen
+ * with less SPI traffic and CPU use. In particular:
+ *
+ * - The fan and bed animations are handled using custom characters
+ * that are stored in CGRAM. This allows for the animation to be
+ * updated by writing a single character to the text-buffer (DDRAM).
+ *
+ * - All the information in the status screen is text that is written
+ * to DDRAM, so the work of generating the bitmaps is offloaded to
+ * the ST7920 rather than being render by U8Glib on the MCU.
+ *
+ * - The graphics buffer (GDRAM) is only used for static graphics
+ * elements (nozzle and feedrate bitmaps) and for the progress
+ * bar, so updates are sporadic.
+ */
+
+#include "../../libs/duration_t.h"
+
+typedef const __FlashStringHelper *progmem_str;
+
+#include "ultralcd_impl_st7920_lite_status_screen.h"
+
+#define BUFFER_WIDTH 256
+#define BUFFER_HEIGHT 32
+
+#define DDRAM_LINE_1 0x00
+#define DDRAM_LINE_2 0x10
+#define DDRAM_LINE_3 0x08
+#define DDRAM_LINE_4 0x18
+
+ST7920_Lite_Status_Screen::st7920_state_t ST7920_Lite_Status_Screen::current_bits;
+
+void ST7920_Lite_Status_Screen::cmd(uint8_t cmd) {
+ if(!current_bits.synced || !current_bits.cmd) {
+ current_bits.synced = true;
+ current_bits.cmd = true;
+ sync_cmd();
+ }
+ write_byte(cmd);
+}
+
+void ST7920_Lite_Status_Screen::begin_data() {
+ extended_function_set(false);
+ if(!current_bits.synced || current_bits.cmd) {
+ current_bits.synced = true;
+ current_bits.cmd = false;
+ sync_dat();
+ }
+}
+
+void ST7920_Lite_Status_Screen::write_word(uint16_t w) {
+ write_byte((w >> 8) & 0xFF);
+ write_byte((w >> 0) & 0xFF);
+}
+
+void ST7920_Lite_Status_Screen::write_str(const char *str) {
+ while(*str) {
+ write_byte(*str++);
+ }
+}
+
+void ST7920_Lite_Status_Screen::write_str(const char *str, uint8_t len) {
+ while(*str && len--) {
+ write_byte(*str++);
+ }
+}
+
+void ST7920_Lite_Status_Screen::write_str_P(const char *str) {
+ const char *p_str = (const char *)str;
+ char c = pgm_read_byte_near(p_str++);
+ while(c) {
+ write_byte(c);
+ c = pgm_read_byte_near(p_str++);
+ }
+}
+
+void ST7920_Lite_Status_Screen::write_str(progmem_str str) {
+ write_str_P((const char*)str);
+}
+
+void ST7920_Lite_Status_Screen::write_number(uint8_t value, uint8_t digits) {
+ char str[7];
+ const char *fmt;
+ switch(digits) {
+ case 6: fmt = PSTR("%6d"); break;
+ case 5: fmt = PSTR("%5d"); break;
+ case 4: fmt = PSTR("%4d"); break;
+ case 3: fmt = PSTR("%3d"); break;
+ case 2: fmt = PSTR("%2d"); break;
+ case 1: fmt = PSTR("%1d"); break;
+ }
+ sprintf_P(str,fmt,value);
+ write_str(str);
+}
+
+void ST7920_Lite_Status_Screen::display_status(bool display_on, bool cursor_on, bool blink_on) {
+ extended_function_set(false);
+ cmd(0b00001000 |
+ (display_on ? 0b0100 : 0) |
+ (cursor_on ? 0b0010 : 0) |
+ (blink_on ? 0b0001 : 0)
+ );
+}
+
+// Sets the extended and graphics bits simultaneously, regardless of
+// the current state. This is a helper function for extended_function_set()
+// and graphics()
+void ST7920_Lite_Status_Screen::_extended_function_set(bool extended, bool graphics) {
+ cmd( 0b00100000 |
+ (extended ? 0b00000100 : 0) |
+ (graphics ? 0b00000010 : 0)
+ );
+ current_bits.extended = extended;
+ current_bits.graphics = graphics;
+}
+
+void ST7920_Lite_Status_Screen::extended_function_set(bool extended) {
+ if(extended != current_bits.extended) {
+ _extended_function_set(extended, current_bits.graphics);
+ }
+}
+
+void ST7920_Lite_Status_Screen::graphics(bool graphics) {
+ if(graphics != current_bits.graphics) {
+ _extended_function_set(current_bits.extended, graphics);
+ }
+}
+
+void ST7920_Lite_Status_Screen::entry_mode_select(bool ac_increase, bool shift) {
+ extended_function_set(false);
+ cmd(0b00000100 |
+ (ac_increase ? 0b00000010 : 0) |
+ (shift ? 0b00000001 : 0)
+ );
+}
+
+// Sets the sa bit regardless of the current state. This is a helper
+// function for scroll_or_addr_select()
+void ST7920_Lite_Status_Screen::_scroll_or_addr_select(bool sa) {
+ extended_function_set(true);
+ cmd(0b00100010 |
+ (sa ? 0b000001 : 0)
+ );
+ current_bits.sa = sa;
+}
+
+void ST7920_Lite_Status_Screen::scroll_or_addr_select(bool sa) {
+ if(sa != current_bits.sa) {
+ _scroll_or_addr_select(sa);
+ }
+}
+
+void ST7920_Lite_Status_Screen::set_ddram_address(uint8_t addr) {
+ extended_function_set(false);
+ cmd(0b10000000 | (addr & 0b00111111));
+}
+
+void ST7920_Lite_Status_Screen::set_cgram_address(uint8_t addr) {
+ extended_function_set(false);
+ cmd(0b01000000 | (addr & 0b00111111));
+}
+
+void ST7920_Lite_Status_Screen::set_gdram_address(uint8_t x, uint8_t y) {
+ extended_function_set(true);
+ cmd(0b10000000 | (y & 0b01111111));
+ cmd(0b10000000 | (x & 0b00001111));
+}
+
+void ST7920_Lite_Status_Screen::clear() {
+ extended_function_set(false);
+ cmd(0x00000001);
+ delay(15); //delay for CGRAM clear
+}
+
+void ST7920_Lite_Status_Screen::home() {
+ extended_function_set(false);
+ cmd(0x00000010);
+}
+
+/* This fills the entire text buffer with spaces */
+void ST7920_Lite_Status_Screen::clear_ddram()
+{
+ set_ddram_address(DDRAM_LINE_1);
+ begin_data();
+ for(int i=0; i < 64;i++) {
+ write_byte(' ');
+ }
+}
+
+/* This fills the entire graphics buffer with zeros */
+void ST7920_Lite_Status_Screen::clear_gdram()
+{
+ for(int y = 0; y < BUFFER_HEIGHT; y++) {
+ set_gdram_address(0,y);
+ begin_data();
+ for(int i = 0; i < (BUFFER_WIDTH / 16); i++) {
+ write_byte(0);
+ write_byte(0);
+ }
+ }
+}
+
+void ST7920_Lite_Status_Screen::load_cgram_icon(uint16_t addr, const void *data) {
+ const uint16_t *p_word = (const uint16_t *)data;
+ set_cgram_address(addr);
+ begin_data();
+ for(int i = 0; i < 16; i++) {
+ uint16_t word = pgm_read_word_near(p_word++);
+ write_byte((word & 0xFF00) >> 8);
+ write_byte((word & 0x00FF) >> 0);
+ }
+}
+
+/* Draws an icon in GDRAM. The position is specified in
+ as if they were DDRAM coordinates, i.e. the x position
+ is [1-8], while the y position is [1-4] */
+void ST7920_Lite_Status_Screen::draw_gdram_icon(uint8_t x, uint8_t y, const void *data) {
+ const uint16_t *p_word = (const uint16_t *)data;
+ if(y > 2) {
+ // Handle display folding
+ y -= 2;
+ x += 8;
+ }
+ x -= 1;
+ y -= 1;
+ for(int i = 0; i < 16; i++) {
+ uint16_t word = pgm_read_word_near(p_word++);
+ set_gdram_address(x,i+y*16);
+ begin_data();
+ write_byte((word & 0xFF00) >> 8);
+ write_byte((word & 0x00FF) >> 0);
+ }
+}
+
+/************************** MAIN SCREEN *************************************/
+
+void ST7920_Lite_Status_Screen::draw_static_elements() {
+ scroll_or_addr_select(0);
+
+ // Load the animated bed and fan icons
+ load_cgram_icon(CGRAM_ICON_1_ADDR, heat1_icon);
+ load_cgram_icon(CGRAM_ICON_2_ADDR, heat2_icon);
+ load_cgram_icon(CGRAM_ICON_3_ADDR, fan1_icon);
+ load_cgram_icon(CGRAM_ICON_4_ADDR, fan2_icon);
+
+ // Draw the static icons in GDRAM
+ draw_gdram_icon(1,1,nozzle_icon);
+ #if EXTRUDERS == 2
+ draw_gdram_icon(1,2,nozzle_icon);
+ #endif
+ draw_gdram_icon(6,2,feedrate_icon);
+ draw_gdram_icon(1,2,bed_icon);
+
+ // Draw the initial fan icon
+ draw_fan_icon(false);
+}
+
+/* Although this is undocumented, the ST7920 allows the character
+ * data buffer (DDRAM) to be used in conjunction with the graphics
+ * bitmap buffer (CGRAM). The contents of the graphics buffer is
+ * XORed with the data from the character generator. This allows
+ * us to make the progess bar out of graphical data (the bar) and
+ * text data (the percentage).
+ */
+void ST7920_Lite_Status_Screen::draw_progress_bar(uint8_t value) {
+ #if EXTRUDERS == 1
+ // If we have only one extruder, draw a long progress bar on the third line
+ const int top = 1; // Top in pixels
+ const int bottom = 13; // Bottom in pixels
+ const int left = 8; // Left edge, in 16-bit words
+ const int width = 5; // Width of progress bar, in 16-bit words
+ #else
+ const int top = 16 + 1; // Top in pixels
+ const int bottom = 16 + 13; // Bottom in pixels
+ const int left = 5; // Left edge, in 16-bit words
+ const int width = 3; // Width of progress bar, in 16-bit words
+ #endif
+ const int char_pcnt = 100/width; // How many percent does each 16-bit word represent?
+
+ // Draw the progress bar as a bitmap in CGRAM
+
+ for(int y = top; y <= bottom; y++) {
+ set_gdram_address(left,y);
+ begin_data();
+ for(int x = 0; x < width; x++) {
+ uint16_t gfx_word = 0x0000;
+ if((x+1)*char_pcnt <= value) {
+ // Draw completely filled bytes
+ gfx_word = 0xFFFF;
+ } else if((x*char_pcnt) < value) {
+ // Draw partially filled bytes
+ gfx_word = int(0x8000) >> (value % char_pcnt)*16/char_pcnt;
+ }
+ // Draw the frame around the progress bar
+ if(y == top || y == bottom) {
+ // Draw top/bottom border
+ gfx_word = 0xFFFF;
+ } else if (x == (width-1)) {
+ // Draw right border
+ gfx_word |= 0x0001;
+ } else if (x == 0) {
+ // Draw left border
+ gfx_word |= 0x8000;
+ }
+ write_word(gfx_word);
+ }
+ }
+
+ // Draw the percentage as text in DDRAM
+
+ #if EXTRUDERS == 1
+ set_ddram_address(DDRAM_LINE_3 + 1);
+ #else
+ set_ddram_address(DDRAM_LINE_2 + left);
+ #endif
+
+ begin_data();
+ if(value > 9) {
+ write_number(value,4);
+ write_str(F("% "));
+ } else {
+ write_number(value,3);
+ write_str(F("% "));
+ }
+}
+
+void ST7920_Lite_Status_Screen::draw_fan_icon(bool whichIcon) {
+ set_ddram_address(DDRAM_LINE_1+5);
+ begin_data();
+ write_word(whichIcon ? CGRAM_ICON_3_WORD : CGRAM_ICON_4_WORD);
+}
+
+void ST7920_Lite_Status_Screen::draw_heat_icon(bool whichIcon, bool heating) {
+ #if EXTRUDERS == 1
+ set_ddram_address(DDRAM_LINE_2);
+ #else
+ set_ddram_address(DDRAM_LINE_3);
+ #endif
+ begin_data();
+ if(heating) {
+ write_word(whichIcon ? CGRAM_ICON_1_WORD : CGRAM_ICON_2_WORD);
+ } else {
+ write_byte(' ');
+ write_byte(' ');
+ }
+}
+
+#define FAR(a,b) (((a > b) ? (a-b) : (b-a)) > 1)
+
+void ST7920_Lite_Status_Screen::draw_extruder_1_temp(uint8_t temp, uint8_t target) {
+ set_ddram_address(DDRAM_LINE_1+1);
+ begin_data();
+ write_number(temp);
+ if(target && FAR(temp, target)) {
+ write_str(F("\x1A"));
+ write_number(target);
+ } else {
+ write_str(F(" "));
+ }
+}
+
+void ST7920_Lite_Status_Screen::draw_extruder_2_temp(uint8_t temp, uint8_t target) {
+ set_ddram_address(DDRAM_LINE_2+1);
+ begin_data();
+ write_number(temp);
+ if(target && FAR(temp, target)) {
+ write_str(F("\x1A"));
+ write_number(target);
+ } else {
+ write_str(F(" "));
+ }
+}
+
+void ST7920_Lite_Status_Screen::draw_bed_temp(uint8_t temp, uint8_t target) {
+ #if EXTRUDERS == 1
+ set_ddram_address(DDRAM_LINE_2+1);
+ #else
+ set_ddram_address(DDRAM_LINE_3+1);
+ #endif
+ begin_data();
+ write_number(temp);
+ if(target && FAR(temp, target)) {
+ write_str(F("\x1A"));
+ write_number(target);
+ } else {
+ write_str(F(" "));
+ }
+}
+
+void ST7920_Lite_Status_Screen::draw_fan_speed(uint8_t value) {
+ set_ddram_address(DDRAM_LINE_1+6);
+ begin_data();
+ write_number(value,4);
+}
+
+void ST7920_Lite_Status_Screen::draw_print_time(uint32_t elapsed) {
+ const uint8_t hrs = elapsed/3600;
+ const uint8_t min = (elapsed/60)%60;
+ char str[7];
+ sprintf_P(str,hrs > 99 ? PSTR("%03d:%02d") : PSTR(" %02d:%02d"),hrs,min);
+
+ set_ddram_address(DDRAM_LINE_3+5);
+ begin_data();
+ write_str(str);
+}
+
+void ST7920_Lite_Status_Screen::draw_feedrate_percentage(uint8_t percentage) {
+ // We only have enough room for the feedrate when
+ // we have one extruder
+ #if EXTRUDERS == 1
+ set_ddram_address(DDRAM_LINE_2+6);
+ begin_data();
+ write_number(percentage,4);
+ #endif
+}
+
+void ST7920_Lite_Status_Screen::draw_status_message(const char *str) {
+ set_ddram_address(DDRAM_LINE_4);
+ begin_data();
+ #if ENABLED(STATUS_MESSAGE_SCROLLING)
+ const uint8_t lcd_len = 16;
+ const uint8_t padding = 2;
+ uint8_t str_len = strlen(str);
+
+ // Trim whitespace at the end of the str, as for some reason
+ // messages like "Card Inserted" are padded with many spaces
+ while(str_len > 0 && str[str_len-1] == ' ') {
+ str_len--;
+ }
+
+ if(str_len <= lcd_len) {
+ // It all fits on the LCD without scrolling
+ write_str(str);
+ } else {
+ // Print the message repeatedly until covering the LCD
+ uint8_t c = status_scroll_pos;
+ for(uint8_t n = 0; n < lcd_len; n++) {
+ write_byte(c < str_len ? str[c] : ' ');
+ c++;
+ c %= str_len + padding; // Wrap around
+ }
+
+ // Scroll the message
+ if(status_scroll_pos == str_len + padding) {
+ status_scroll_pos = 0;
+ } else {
+ status_scroll_pos++;
+ }
+ }
+ #else
+ write_str(str, 16);
+ #endif
+}
+
+void ST7920_Lite_Status_Screen::draw_position(const float x, const float y, const float z, bool position_known) {
+ char str[7];
+ set_ddram_address(DDRAM_LINE_4);
+ begin_data();
+
+ // If position is unknown, flash the labels.
+ const unsigned char alt_label = position_known ? 0 : (lcd_blink() ? ' ' : 0);
+
+ dtostrf(x, -4, 0, str);
+ write_byte(alt_label ? alt_label : 'X');
+ write_str(str, 4);
+
+ dtostrf(y, -4, 0, str);
+ write_byte(alt_label ? alt_label : 'Y');
+ write_str(str, 4);
+
+ dtostrf(z, -5, 1, str);
+ write_byte(alt_label ? alt_label : 'Z');
+ write_str(str, 5);
+}
+
+bool ST7920_Lite_Status_Screen::indicators_changed() {
+ // We only add the target temperatures to the checksum
+ // because the actual temps fluctuate so by updating
+ // them only during blinks we gain a bit of stability.
+ const bool blink = lcd_blink();
+ const uint8_t feedrate_perc = feedrate_percentage;
+ const uint8_t fan_speed = ((fanSpeeds[0] + 1) * 100) / 256;
+ const float extruder_1_target = thermalManager.degTargetHotend(0);
+ #if EXTRUDERS == 2
+ const float extruder_2_target = thermalManager.degTargetHotend(1);
+ #endif
+ const float bed_target = thermalManager.degTargetBed();
+
+ static uint8_t last_checksum = 0;
+
+ const uint8_t checksum =
+ uint8_t(blink) ^
+ uint8_t(feedrate_perc) ^
+ uint8_t(fan_speed) ^
+ uint8_t(extruder_1_target) ^
+#if EXTRUDERS == 2
+ uint8_t(extruder_2_target) ^
+#endif
+ uint8_t(bed_target);
+
+ if(last_checksum == checksum) {
+ return false;
+ } else {
+ last_checksum = checksum;
+ return true;
+ }
+}
+
+void ST7920_Lite_Status_Screen::update_indicators(bool forceUpdate) {
+ if(forceUpdate || indicators_changed()) {
+ const bool blink = lcd_blink();
+ const duration_t elapsed = print_job_timer.duration();
+ const uint32_t seconds_elapsed = elapsed.value;
+ const uint8_t feedrate_perc = feedrate_percentage;
+ const uint8_t fan_speed = ((fanSpeeds[0] + 1) * 100) / 256;
+ const float extruder_1_temp = thermalManager.degHotend(0);
+ const float extruder_1_target = thermalManager.degTargetHotend(0);
+ #if EXTRUDERS == 2
+ const float extruder_2_temp = thermalManager.degHotend(1);
+ const float extruder_2_target = thermalManager.degTargetHotend(1);
+ #endif
+ const float bed_temp = thermalManager.degBed();
+ const float bed_target = thermalManager.degTargetBed();
+
+ draw_extruder_1_temp(extruder_1_temp, extruder_1_target);
+ #if EXTRUDERS == 2
+ draw_extruder_2_temp(extruder_2_temp, extruder_2_target);
+ #endif
+ draw_bed_temp(bed_temp, bed_target);
+ draw_fan_speed(fan_speed);
+ draw_print_time(seconds_elapsed);
+ draw_feedrate_percentage(feedrate_perc);
+
+ // Update the fan and bed animations
+ if(fan_speed > 0) {
+ draw_fan_icon(blink);
+ }
+ if(bed_target > 0) {
+ draw_heat_icon(blink, true);
+ } else {
+ draw_heat_icon(false, false);
+ }
+ }
+}
+
+bool ST7920_Lite_Status_Screen::position_changed() {
+ const float x_pos = current_position[X_AXIS];
+ const float y_pos = current_position[Y_AXIS];
+ const float z_pos = current_position[Z_AXIS];
+ const uint8_t checksum = uint8_t(x_pos) ^ uint8_t(y_pos) ^ uint8_t(z_pos);
+
+ static uint8_t last_checksum = 0;
+ if(last_checksum == checksum) {
+ return false;
+ } else {
+ last_checksum = checksum;
+ return true;
+ }
+}
+
+bool ST7920_Lite_Status_Screen::status_changed() {
+ uint8_t checksum = 0;
+ for(const char *p = lcd_status_message; *p; p++) {
+ checksum ^= *p;
+ }
+
+ static uint8_t last_checksum = 0;
+ if(last_checksum == checksum) {
+ return false;
+ } else {
+ last_checksum = checksum;
+ return true;
+ }
+}
+
+bool ST7920_Lite_Status_Screen::blink_changed() {
+ static uint8_t last_blink = 0;
+
+ const bool blink = lcd_blink();
+ if(last_blink == blink) {
+ return false;
+ } else {
+ last_blink = blink;
+ return true;
+ }
+}
+
+void ST7920_Lite_Status_Screen::update_status_or_position(bool forceUpdate) {
+ static uint8_t countdown = 0;
+
+ /* There is only enough room in the display for either the
+ * status message or the position, not both, so we choose
+ * one or another. Whenever the status message changes,
+ * we show it for a number of consecutive seconds, but
+ * then go back to showing the position as soon as the
+ * head moves, i.e:
+ *
+ * countdown > 1 -- Show status
+ * countdown = 1 -- Show status, until movement
+ * countdown = 0 -- Show position
+ */
+ if( forceUpdate || status_changed() ) {
+ #if ENABLED(STATUS_MESSAGE_SCROLLING)
+ status_scroll_pos = 0;
+ #endif
+ if(lcd_strlen(lcd_status_message)) {
+ countdown = DELAY_TO_SHOW_POSITION;
+ } else {
+ countdown = 0;
+ }
+ draw_status_message(lcd_status_message);
+ blink_changed(); // Clear changed flag
+ }
+ else if(countdown > 1 && blink_changed() ) {
+ countdown--;
+ #if ENABLED(STATUS_MESSAGE_SCROLLING)
+ draw_status_message(lcd_status_message);
+ #endif
+ }
+ else if(countdown > 0 && blink_changed() ) {
+ if(position_changed()) {
+ countdown--;
+ forceUpdate = true;
+ }
+ #if ENABLED(STATUS_MESSAGE_SCROLLING)
+ draw_status_message(lcd_status_message);
+ #endif
+ }
+ if(countdown == 0 && (forceUpdate || position_changed() ||
+ #if DISABLED(DISABLE_REDUCED_ACCURACY_WARNING)
+ blink_changed()
+ #endif
+ )) {
+ draw_position(
+ current_position[X_AXIS],
+ current_position[Y_AXIS],
+ current_position[Z_AXIS],
+ #if ENABLED(DISABLE_REDUCED_ACCURACY_WARNING)
+ true
+ #else
+ axis_known_position[X_AXIS] &&
+ axis_known_position[Y_AXIS] &&
+ axis_known_position[Z_AXIS]
+ #endif
+ );
+ }
+}
+
+void ST7920_Lite_Status_Screen::update_progress(bool forceUpdate) {
+ #if ENABLED(SDSUPPORT)
+ const uint8_t percent_done = card.percentDone();
+ #else
+ const uint8_t percent_done = 0;
+ #endif
+
+ // Since the progress bar involves writing
+ // quite a few bytes to GDRAM, only do this
+ // when an update is actually necessary.
+
+ static uint8_t last_progress = 0;
+ if(!forceUpdate && last_progress == percent_done)
+ return;
+ last_progress = percent_done;
+
+ draw_progress_bar(percent_done);
+}
+
+void ST7920_Lite_Status_Screen::update(bool forceUpdate) {
+ cs();
+ update_indicators(forceUpdate);
+ update_status_or_position(forceUpdate);
+ update_progress(forceUpdate);
+ ncs();
+}
+
+void ST7920_Lite_Status_Screen::reset_state_from_unknown() {
+ _extended_function_set(true, true); // Do it twice as only one bit
+ _extended_function_set(true, true); // get set at a time.
+ _scroll_or_addr_select(false);
+}
+
+void ST7920_Lite_Status_Screen::on_entry() {
+ cs();
+ reset_state_from_unknown();
+ clear();
+ clear_gdram();
+ draw_static_elements();
+ update(true);
+ ncs();
+}
+
+void ST7920_Lite_Status_Screen::on_exit() {
+ cs();
+ clear();
+ _extended_function_set(true, true); // Restore state to what u8g expects.
+ ncs();
+}
+
+// This is called prior to the KILL screen to
+// clear the screen so we don't end up with a
+// garbled display.
+void ST7920_Lite_Status_Screen::clear_text_buffer() {
+ cs();
+ reset_state_from_unknown();
+ clear();
+ _extended_function_set(true, true); // Restore state to what u8g expects.
+ ncs();
+}
+
+static void lcd_implementation_status_screen() {
+ ST7920_Lite_Status_Screen::update(false);
+}
+
+/* In order to properly update the lite status screen,
+ * we must know when we have entered and left the
+ * status screen. Since the ultralcd code is not
+ * set up for doing this, we call this function before
+ * each update indicating whether the current screen
+ * is the status screen.
+ *
+ * This function keeps track of whether we have left or
+ * entered the status screen and calls the on_entry()
+ * and on_exit() methods for cleanup.
+ */
+
+static void lcd_in_status(bool inStatus) {
+ static bool lastInStatus = false;
+ if(!lastInStatus && inStatus) {
+ ST7920_Lite_Status_Screen::on_entry();
+ lastInStatus = true;
+ }
+ if(lastInStatus && !inStatus) {
+ ST7920_Lite_Status_Screen::on_exit();
+ lastInStatus = false;
+ }
+}
\ No newline at end of file
diff --git a/Marlin/src/lcd/dogm/ultralcd_impl_st7920_lite_status_screen_impl_spi.h b/Marlin/src/lcd/dogm/ultralcd_impl_st7920_lite_status_screen_impl_spi.h
new file mode 100644
index 0000000000..1a0a33be4a
--- /dev/null
+++ b/Marlin/src/lcd/dogm/ultralcd_impl_st7920_lite_status_screen_impl_spi.h
@@ -0,0 +1,39 @@
+/*
+ * Lightweight Status Screen for the RepRapDiscount Full
+ * Graphics Smart Controller (ST7920-based 128x64 LCD)
+ *
+ * (c) 2017 Aleph Objects, Inc.
+ *
+ * The code in this page is free software: you can
+ * redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GNU GPL) as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option)
+ * any later version. The code is distributed WITHOUT ANY WARRANTY;
+ * without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU GPL for more details.
+ *
+ */
+
+#include "ultralcd_impl_st7920_lite_status_screen.h"
+
+void ST7920_Lite_Status_Screen::cs() {
+ ST7920_CS();
+ current_bits.synced = false;
+}
+
+void ST7920_Lite_Status_Screen::ncs() {
+ ST7920_NCS();
+ current_bits.synced = false;
+}
+
+void ST7920_Lite_Status_Screen::sync_cmd() {
+ ST7920_SET_CMD();
+}
+
+void ST7920_Lite_Status_Screen::sync_dat() {
+ ST7920_SET_DAT();
+}
+
+void ST7920_Lite_Status_Screen::write_byte(uint8_t data) {
+ ST7920_WRITE_NIBBLES(data);
+}
\ No newline at end of file
diff --git a/Marlin/src/lcd/dogm/ultralcd_st7920_u8glib_rrd_AVR.cpp b/Marlin/src/lcd/dogm/ultralcd_st7920_u8glib_rrd_AVR.cpp
index bc1e8bc16e..39a3cc17a1 100644
--- a/Marlin/src/lcd/dogm/ultralcd_st7920_u8glib_rrd_AVR.cpp
+++ b/Marlin/src/lcd/dogm/ultralcd_st7920_u8glib_rrd_AVR.cpp
@@ -124,10 +124,12 @@ uint8_t u8g_dev_rrd_st7920_128x64_fn(u8g_t *u8g, u8g_dev_t *dev, uint8_t msg, vo
ST7920_CS();
u8g_Delay(120); //initial delay for boot up
ST7920_SET_CMD();
+ ST7920_WRITE_BYTE(0x20); //non-extended mode
ST7920_WRITE_BYTE(0x08); //display off, cursor+blink off
- ST7920_WRITE_BYTE(0x01); //clear CGRAM ram
- u8g_Delay(15); //delay for CGRAM clear
- ST7920_WRITE_BYTE(0x3E); //extended mode + GDRAM active
+ ST7920_WRITE_BYTE(0x01); //clear DDRAM ram
+ u8g_Delay(15); //delay for DDRAM clear
+ ST7920_WRITE_BYTE(0x24); //extended mode
+ ST7920_WRITE_BYTE(0x26); //extended mode + GDRAM active
for (y = 0; y < (LCD_PIXEL_HEIGHT) / 2; y++) { //clear GDRAM
ST7920_WRITE_BYTE(0x80 | y); //set y
ST7920_WRITE_BYTE(0x80); //set x = 0
@@ -181,6 +183,14 @@ uint8_t u8g_dev_st7920_128x64_rrd_buf[(LCD_PIXEL_WIDTH) * (PAGE_HEIGHT) / 8] U
u8g_pb_t u8g_dev_st7920_128x64_rrd_pb = {{PAGE_HEIGHT, LCD_PIXEL_HEIGHT, 0, 0, 0}, LCD_PIXEL_WIDTH, u8g_dev_st7920_128x64_rrd_buf};
u8g_dev_t u8g_dev_st7920_128x64_rrd_sw_spi = {u8g_dev_rrd_st7920_128x64_fn, &u8g_dev_st7920_128x64_rrd_pb, &u8g_com_null_fn};
+#if ENABLED(USE_ST7920_LIGHTWEIGHT_UI)
+ typedef const __FlashStringHelper *progmem_str;
+
+ // We have to include the code for the lightweight UI here
+ // as it relies on macros that are only defined in this file.
+ #include "ultralcd_impl_st7920_lite_status_screen_impl_spi.h"
+#endif
+
#pragma GCC reset_options
#endif // U8G_HAL_LINKS
diff --git a/Marlin/src/lcd/ultralcd.cpp b/Marlin/src/lcd/ultralcd.cpp
index c4b6756d0e..b7a66e894c 100644
--- a/Marlin/src/lcd/ultralcd.cpp
+++ b/Marlin/src/lcd/ultralcd.cpp
@@ -5116,20 +5116,38 @@ void lcd_update() {
#endif
#if ENABLED(DOGLCD)
- if (!drawing_screen) { // If not already drawing pages
- u8g.firstPage(); // Start the first page
- drawing_screen = 1; // Flag as drawing pages
- }
- lcd_setFont(FONT_MENU); // Setup font for every page draw
- u8g.setColorIndex(1); // And reset the color
- CURRENTSCREEN(); // Draw and process the current screen
+ #if defined(USE_ST7920_LIGHTWEIGHT_UI)
+ #if ENABLED(ULTIPANEL)
+ bool do_U8G_loop = true;
+ lcd_in_status(currentScreen == lcd_status_screen);
+ if(currentScreen == lcd_status_screen) {
+ lcd_status_screen();
+ do_U8G_loop = false;
+ }
+ #else
+ const bool do_U8G_loop = false;
+ lcd_in_status(true);
+ lcd_status_screen();
+ #endif
+ #else
+ const bool do_U8G_loop = true;
+ #endif
+ if(do_U8G_loop) {
+ if (!drawing_screen) { // If not already drawing pages
+ u8g.firstPage(); // Start the first page
+ drawing_screen = 1; // Flag as drawing pages
+ }
+ lcd_setFont(FONT_MENU); // Setup font for every page draw
+ u8g.setColorIndex(1); // And reset the color
+ CURRENTSCREEN(); // Draw and process the current screen
- // The screen handler can clear drawing_screen for an action that changes the screen.
- // If still drawing and there's another page, update max-time and return now.
- // The nextPage will already be set up on the next call.
- if (drawing_screen && (drawing_screen = u8g.nextPage())) {
- NOLESS(max_display_update_time, millis() - ms);
- return;
+ // The screen handler can clear drawing_screen for an action that changes the screen.
+ // If still drawing and there's another page, update max-time and return now.
+ // The nextPage will already be set up on the next call.
+ if (drawing_screen && (drawing_screen = u8g.nextPage())) {
+ NOLESS(max_display_update_time, millis() - ms);
+ return;
+ }
}
#else
CURRENTSCREEN();
diff --git a/Marlin/src/lcd/ultralcd_impl_DOGM.h b/Marlin/src/lcd/ultralcd_impl_DOGM.h
index 0b7b4badf6..2ec7432c5d 100644
--- a/Marlin/src/lcd/ultralcd_impl_DOGM.h
+++ b/Marlin/src/lcd/ultralcd_impl_DOGM.h
@@ -54,6 +54,11 @@
#include "dogm/dogm_bitmaps.h"
+#if ENABLED(USE_ST7920_LIGHTWEIGHT_UI)
+ typedef const __FlashStringHelper *progmem_str;
+ #include "dogm/ultralcd_impl_st7920_lite_status_screen_impl.h"
+#endif
+
#if ENABLED(SDSUPPORT)
#include "../libs/duration_t.h"
#endif
@@ -373,6 +378,9 @@ static void lcd_implementation_init() {
// The kill screen is displayed for unrecoverable conditions
void lcd_kill_screen() {
+ #if ENABLED(USE_ST7920_LIGHTWEIGHT_UI)
+ ST7920_Lite_Status_Screen::clear_text_buffer();
+ #endif
const uint8_t h4 = u8g.getHeight() / 4;
u8g.firstPage();
do {
@@ -498,6 +506,7 @@ inline void lcd_implementation_status_message(const bool blink) {
#endif
}
+#if !ENABLED(USE_ST7920_LIGHTWEIGHT_UI)
static void lcd_implementation_status_screen() {
const bool blink = lcd_blink();
@@ -801,6 +810,7 @@ static void lcd_implementation_status_screen() {
#endif
}
}
+#endif
#if ENABLED(ULTIPANEL)