Extensible user interface API (#11193)

Marlin/Configuration.h

@@ -1839,6 +1839,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/Marlin.cpp

@@ -152,6 +152,10 @@
   #include "feature/controllerfan.h"
 #endif
 
+#if ENABLED(EXTENSIBLE_UI)
+  #include "lcd/extensible_ui/ui_api.h"
+#endif
+
 bool Running = true;
 
 /**
@@ -609,7 +613,9 @@ void kill(PGM_P lcd_msg) {
   thermalManager.disable_all_heaters();
   disable_all_steppers();
 
-  #if ENABLED(ULTRA_LCD)
+  #if ENABLED(EXTENSIBLE_UI)
+    UI::onPrinterKilled(lcd_msg);
+  #elif ENABLED(ULTRA_LCD)
     kill_screen(lcd_msg);
   #else
     UNUSED(lcd_msg);
@@ -958,7 +964,7 @@ void loop() {
       card.checkautostart();
     #endif
 
-    #if ENABLED(SDSUPPORT) && ENABLED(ULTIPANEL)
+    #if ENABLED(SDSUPPORT) && (ENABLED(ULTIPANEL) || ENABLED(EXTENSIBLE_UI))
       if (abort_sd_printing) {
         abort_sd_printing = false;
         card.stopSDPrint(
@@ -978,7 +984,7 @@ void loop() {
           card.removeJobRecoveryFile();
         #endif
       }
-    #endif // SDSUPPORT && ULTIPANEL
+    #endif // SDSUPPORT && (ENABLED(ULTIPANEL) || ENABLED(EXTENSIBLE_UI))
 
     if (commands_in_queue < BUFSIZE) get_available_commands();
     advance_command_queue();

Marlin/src/config/default/Configuration.h

@@ -1839,6 +1839,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/AlephObjects/TAZ4/Configuration.h

@@ -1859,6 +1859,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/AliExpress/CL-260/Configuration.h

@@ -1839,6 +1839,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/Anet/A2/Configuration.h

@@ -1841,6 +1841,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/Anet/A2plus/Configuration.h

@@ -1841,6 +1841,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/Anet/A6/Configuration.h

@@ -1994,6 +1994,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/Anet/A8/Configuration.h

@@ -1848,6 +1848,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/Azteeg/X5GT/Configuration.h

@@ -1839,6 +1839,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/BIBO/TouchX/cyclops/Configuration.h

@@ -1839,6 +1839,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/BIBO/TouchX/default/Configuration.h

@@ -1839,6 +1839,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/BQ/Hephestos/Configuration.h

@@ -1827,6 +1827,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/BQ/Hephestos_2/Configuration.h

@@ -1839,6 +1839,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/BQ/WITBOX/Configuration.h

@@ -1827,6 +1827,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/Cartesio/Configuration.h

@@ -1838,6 +1838,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/Creality/CR-10/Configuration.h

@@ -1849,6 +1849,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/Creality/CR-10S/Configuration.h

@@ -1844,6 +1844,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/Creality/CR-10mini/Configuration.h

@@ -1858,6 +1858,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/Creality/CR-8/Configuration.h

@@ -1849,6 +1849,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/Creality/Ender-2/Configuration.h

@@ -1843,6 +1843,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/Creality/Ender-3/Configuration.h

@@ -1843,6 +1843,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/Creality/Ender-4/Configuration.h

@@ -1849,6 +1849,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/Felix/Configuration.h

@@ -1821,6 +1821,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/Felix/DUAL/Configuration.h

@@ -1821,6 +1821,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/FolgerTech/i3-2020/Configuration.h

@@ -1845,6 +1845,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/Formbot/Raptor/Configuration.h

@@ -1945,6 +1945,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/Formbot/T_Rex_2+/Configuration.h

@@ -1886,6 +1886,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/Formbot/T_Rex_3/Configuration.h

@@ -1872,6 +1872,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/Geeetech/GT2560/Configuration.h

@@ -1854,6 +1854,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/Geeetech/I3_Pro_X-GT2560/Configuration.h

@@ -1839,6 +1839,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/Geeetech/MeCreator2/Configuration.h

@@ -1846,6 +1846,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/Geeetech/Prusa i3 Pro B/bltouch/Configuration.h

@@ -1855,6 +1855,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/Geeetech/Prusa i3 Pro B/noprobe/Configuration.h

@@ -1854,6 +1854,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/Geeetech/Prusa i3 Pro C/Configuration.h

@@ -1839,6 +1839,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/Geeetech/Prusa i3 Pro W/Configuration.h

@@ -1839,6 +1839,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/Infitary/i3-M508/Configuration.h

@@ -1843,6 +1843,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/JGAurora/A5/Configuration.h

@@ -1850,6 +1850,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/MakerParts/Configuration.h

@@ -1859,6 +1859,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/Malyan/M150/Configuration.h

@@ -1867,6 +1867,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/Malyan/M200/Configuration.h

@@ -1838,6 +1838,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/Micromake/C1/basic/Configuration.h

@@ -1843,6 +1843,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/Micromake/C1/enhanced/Configuration.h

@@ -1843,6 +1843,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/Mks/Sbase/Configuration.h

@@ -1839,6 +1839,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/RepRapPro/Huxley/Configuration.h

@@ -1888,6 +1888,15 @@ Black rubber belt(MXL), 18 - tooth aluminium pulley : 87.489 step per mm (Huxley
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/RepRapWorld/Megatronics/Configuration.h

@@ -1839,6 +1839,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/RigidBot/Configuration.h

@@ -1839,6 +1839,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/SCARA/Configuration.h

@@ -1852,6 +1852,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/STM32F10/Configuration.h

@@ -1841,6 +1841,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/STM32F4/Configuration.h

@@ -1839,6 +1839,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/Sanguinololu/Configuration.h

@@ -1870,6 +1870,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/TheBorg/Configuration.h

@@ -1839,6 +1839,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/TinyBoy2/Configuration.h

@@ -1895,6 +1895,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/Tronxy/X1/Configuration.h

@@ -1839,6 +1839,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/Tronxy/X3A/Configuration.h

@@ -1843,6 +1843,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/Tronxy/X5S/Configuration.h

@@ -1839,6 +1839,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/Tronxy/XY100/Configuration.h

@@ -1850,6 +1850,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/UltiMachine/Archim2/Configuration.h

@@ -1839,6 +1839,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/Velleman/K8200/Configuration.h

@@ -1874,6 +1874,15 @@
 
 #endif // K8200_VM8201
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/Velleman/K8400/Configuration.h

@@ -1839,6 +1839,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/Velleman/K8400/Dual-head/Configuration.h

@@ -1839,6 +1839,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/Wanhao/Duplicator 6/Configuration.h

@@ -1852,6 +1852,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/adafruit/ST7565/Configuration.h

@@ -1839,6 +1839,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/delta/Anycubic/Kossel/Configuration.h

@@ -2030,6 +2030,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/delta/FLSUN/auto_calibrate/Configuration.h

@@ -1967,6 +1967,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/delta/FLSUN/kossel/Configuration.h

@@ -1966,6 +1966,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/delta/FLSUN/kossel_mini/Configuration.h

@@ -1966,6 +1966,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/delta/Hatchbox_Alpha/Configuration.h

@@ -1969,6 +1969,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/delta/generic/Configuration.h

@@ -1954,6 +1954,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/delta/kossel_mini/Configuration.h

@@ -1956,6 +1956,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/delta/kossel_pro/Configuration.h

@@ -1957,6 +1957,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/delta/kossel_xl/Configuration.h

@@ -1957,6 +1957,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/gCreate/gMax1.5+/Configuration.h

@@ -1853,6 +1853,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/makibox/Configuration.h

@@ -1842,6 +1842,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/stm32f103ret6/Configuration.h

@@ -1841,6 +1841,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/tvrrug/Round2/Configuration.h

@@ -1834,6 +1834,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/config/examples/wt150/Configuration.h

@@ -1844,6 +1844,15 @@
 //
 //#define SILVER_GATE_GLCD_CONTROLLER
 
+//
+// Extensible UI
+//
+// Enable third-party or vendor customized user interfaces that aren't
+// packaged with Marlin. Source code for the user interface will need to
+// be placed in "src/lcd/extensible_ui/lib"
+//
+//#define EXTENSIBLE_UI
+
 //=============================================================================
 //============================  Other Controllers  ============================
 //=============================================================================

Marlin/src/feature/runout.h

@@ -34,6 +34,10 @@
 
 #include "../inc/MarlinConfig.h"
 
+#if ENABLED(EXTENSIBLE_UI)
+  #include "../lcd/extensible_ui/ui_api.h"
+#endif
+
 #define FIL_RUNOUT_THRESHOLD 5
 
 class FilamentRunoutSensor {
@@ -49,6 +53,9 @@ class FilamentRunoutSensor {
     FORCE_INLINE static void run() {
       if ((IS_SD_PRINTING || print_job_timer.isRunning()) && check() && !filament_ran_out) {
         filament_ran_out = true;
+        #if ENABLED(EXTENSIBLE_UI)
+          UI::onFilamentRunout();
+        #endif
         enqueue_and_echo_commands_P(PSTR(FILAMENT_RUNOUT_SCRIPT));
         planner.synchronize();
       }

Marlin/src/gcode/eeprom/M500-M504.cpp

@@ -25,6 +25,10 @@
 #include "../../core/serial.h"
 #include "../../inc/MarlinConfig.h"
 
+#if ENABLED(EXTENSIBLE_UI)
+  #include "../../lcd/extensible_ui/ui_api.h"
+#endif
+
 #if NUM_SERIAL > 1
   #include "../../gcode/queue.h"
 #endif
@@ -40,6 +44,9 @@
  */
 void GcodeSuite::M500() {
   (void)settings.save(CHAT_PORT);
+  #if ENABLED(EXTENSIBLE_UI)
+    UI::onStoreSettings();
+  #endif
 }
 
 /**
@@ -58,6 +65,9 @@ void GcodeSuite::M501() {
  */
 void GcodeSuite::M502() {
   (void)settings.reset(CHAT_PORT);
+  #if ENABLED(EXTENSIBLE_UI)
+    UI::onFactoryReset();
+  #endif
 }
 
 #if DISABLED(DISABLE_M503)

Marlin/src/gcode/stats/M75-M78.cpp

@@ -23,20 +23,39 @@
 #include "../gcode.h"
 #include "../../module/printcounter.h"
 
+#if ENABLED(EXTENSIBLE_UI)
+  #include "../../lcd/extensible_ui/ui_api.h"
+#endif
+
 /**
  * M75: Start print timer
  */
-void GcodeSuite::M75() { print_job_timer.start(); }
+void GcodeSuite::M75() {
+  print_job_timer.start();
+  #if ENABLED(EXTENSIBLE_UI)
+    UI::onPrintTimerStarted();
+  #endif
+}
 
 /**
  * M76: Pause print timer
  */
-void GcodeSuite::M76() { print_job_timer.pause(); }
+void GcodeSuite::M76() {
+  print_job_timer.pause();
+  #if ENABLED(EXTENSIBLE_UI)
+    UI::onPrintTimerPaused();
+  #endif
+}
 
 /**
  * M77: Stop print timer
  */
-void GcodeSuite::M77() { print_job_timer.stop(); }
+void GcodeSuite::M77() {
+ print_job_timer.stop();
+ #if ENABLED(EXTENSIBLE_UI)
+   UI::onPrintTimerStopped();
+ #endif
+}
 
 #if ENABLED(PRINTCOUNTER)
 

Marlin/src/inc/Conditionals_LCD.h

@@ -543,7 +543,7 @@
 #define HOMING_Z_WITH_PROBE (HAS_BED_PROBE && Z_HOME_DIR < 0 && ENABLED(Z_MIN_PROBE_USES_Z_MIN_ENDSTOP_PIN))
 
 #define HAS_SOFTWARE_ENDSTOPS (ENABLED(MIN_SOFTWARE_ENDSTOPS) || ENABLED(MAX_SOFTWARE_ENDSTOPS))
-#define HAS_RESUME_CONTINUE (ENABLED(NEWPANEL) || ENABLED(EMERGENCY_PARSER))
+#define HAS_RESUME_CONTINUE (ENABLED(EXTENSIBLE_UI) || ENABLED(NEWPANEL) || ENABLED(EMERGENCY_PARSER))
 #define HAS_COLOR_LEDS (ENABLED(BLINKM) || ENABLED(RGB_LED) || ENABLED(RGBW_LED) || ENABLED(PCA9632) || ENABLED(NEOPIXEL_LED))
 
 #define Z_MULTI_STEPPER_DRIVERS (ENABLED(Z_DUAL_STEPPER_DRIVERS) || ENABLED(Z_TRIPLE_STEPPER_DRIVERS))

Marlin/src/lcd/extensible_ui/lib/dummy.cpp

@@ -0,0 +1,50 @@
+/*************
+ * dummy.cpp *
+ *************/
+
+/****************************************************************************
+ *   Written By Marcio Teixeira 2018 - Aleph Objects, Inc.                  *
+ *                                                                          *
+ *   This program is free software: you can redistribute it and/or modify   *
+ *   it under the terms of the GNU General Public License as published by   *
+ *   the Free Software Foundation, either version 3 of the License, or      *
+ *   (at your option) any later version.                                    *
+ *                                                                          *
+ *   This program is distributed in the hope that it will be useful,        *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of         *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the          *
+ *   GNU General Public License for more details.                           *
+ *                                                                          *
+ *   To view a copy of the GNU General Public License, go to the following  *
+ *   location: <http://www.gnu.org/licenses/>.                              *
+ ****************************************************************************/
+
+#include "../../../inc/MarlinConfigPre.h"
+
+#if ENABLED(EXTENSIBLE_UI)
+
+#include "../ui_api.h"
+
+// To implement a new UI, complete the functions below and
+// read or update Marlin's state using the methods in the
+// UI methods in "../ui_api.h"
+
+namespace UI {
+  void onStartup() {}
+  void onUpdate() {}
+  void onPrinterKilled(const char* lcd_msg) {}
+  void onMediaInserted();
+  void onMediaError();
+  void onMediaRemoved();
+  void onPlayTone(const uint16_t frequency, const uint16_t duration) {}
+  void onPrintTimerStarted() {}
+  void onPrintTimerPaused() {}
+  void onPrintTimerStopped() {}
+  void onFilamentRunout() {}
+  void onStatusChanged(const char* lcd_msg) {}
+  void onStatusChanged(progmem_str lcd_msg) {}
+  void onFactoryReset() {}
+  void onStoreSettings() {}
+}
+
+#endif // EXTENSIBLE_UI

Marlin/src/lcd/extensible_ui/ui_api.cpp

@@ -0,0 +1,590 @@
+/**************
+ * ui_api.cpp *
+ **************/
+
+/****************************************************************************
+ *   Written By Marcio Teixeira 2018 - Aleph Objects, Inc.                  *
+ *                                                                          *
+ *   This program is free software: you can redistribute it and/or modify   *
+ *   it under the terms of the GNU General Public License as published by   *
+ *   the Free Software Foundation, either version 3 of the License, or      *
+ *   (at your option) any later version.                                    *
+ *                                                                          *
+ *   This program is distributed in the hope that it will be useful,        *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of         *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the          *
+ *   GNU General Public License for more details.                           *
+ *                                                                          *
+ *   To view a copy of the GNU General Public License, go to the following  *
+ *   location: <http://www.gnu.org/licenses/>.                              *
+ ****************************************************************************/
+
+#include "../../Marlin.h"
+
+#if ENABLED(EXTENSIBLE_UI)
+
+#include "../../gcode/queue.h"
+#include "../../module/motion.h"
+#include "../../module/planner.h"
+#include "../../module/probe.h"
+#include "../../module/printcounter.h"
+#include "../../module/temperature.h"
+#include "../../sd/cardreader.h"
+#include "../../libs/duration_t.h"
+
+#if DO_SWITCH_EXTRUDER || ENABLED(SWITCHING_NOZZLE) || ENABLED(PARKING_EXTRUDER)
+  #include "../../module/tool_change.h"
+#endif
+
+#if ENABLED(SDSUPPORT)
+  #include "../../feature/emergency_parser.h"
+
+  bool abort_sd_printing; // =false
+#else
+  constexpr bool abort_sd_printing = false;
+#endif
+
+#include "ui_api.h"
+
+#if ENABLED(BACKLASH_GCODE)
+  extern float backlash_distance_mm[XYZ], backlash_correction;
+  #ifdef BACKLASH_SMOOTHING_MM
+    extern float backlash_smoothing_mm;
+  #endif
+#endif
+
+inline float clamp(const float value, const float minimum, const float maximum) {
+  return MAX(MIN(value, maximum), minimum);
+}
+
+namespace UI {
+
+  void delay_ms(unsigned long ms) {
+    safe_delay(ms);
+  }
+
+  void yield() {
+    thermalManager.manage_heater();
+  }
+
+  float getActualTemp_celsius(const uint8_t extruder) {
+    return extruder ?
+      thermalManager.degHotend(extruder - 1) :
+      #if HAS_HEATED_BED
+        thermalManager.degBed()
+      #else
+        0
+      #endif
+    ;
+  }
+
+  float getTargetTemp_celsius(const uint8_t extruder) {
+    return extruder ?
+      thermalManager.degTargetHotend(extruder - 1) :
+      #if HAS_HEATED_BED
+        thermalManager.degTargetBed()
+      #else
+        0
+      #endif
+    ;
+  }
+
+  float getFan_percent(const uint8_t fan) { return ((float(fan_speed[fan]) + 1) * 100) / 256; }
+
+  float getAxisPosition_mm(const axis_t axis) {
+    switch (axis) {
+      case X: case Y: case Z:
+        return current_position[axis];
+      case E0: case E1: case E2: case E3: case E4: case E5:
+        return current_position[E_AXIS];
+      default: return 0;
+    }
+  }
+
+  void setAxisPosition_mm(const axis_t axis, float position, float _feedrate_mm_s) {
+    #if EXTRUDERS > 1
+      const int8_t old_extruder = active_extruder;
+    #endif
+    switch (axis) {
+      case X: case Y: case Z: break;
+      case E0: case E1: case E2: case E3: case E4: case E5:
+        active_extruder = axis - E0;
+        break;
+      default: return;
+    }
+    set_destination_from_current();
+    switch (axis) {
+      case X: case Y: case Z:
+        destination[Z_AXIS] = position;
+        break;
+      case E0: case E1: case E2: case E3: case E4: case E5:
+        destination[E_AXIS] = position;
+        break;
+    }
+
+    const float old_feedrate = feedrate_mm_s;
+    feedrate_mm_s = _feedrate_mm_s;
+    prepare_move_to_destination();
+    feedrate_mm_s = old_feedrate;
+    #if EXTRUDERS > 1
+      active_extruder = old_extruder;
+    #endif
+  }
+
+  void setActiveTool(uint8_t extruder, bool no_move) {
+    extruder--; // Make zero based
+    #if DO_SWITCH_EXTRUDER || ENABLED(SWITCHING_NOZZLE) || ENABLED(PARKING_EXTRUDER)
+      if (extruder != active_extruder)
+        tool_change(extruder, 0, no_move);
+    #endif
+    active_extruder = extruder;
+  }
+
+  uint8_t getActiveTool() { return active_extruder + 1; }
+
+  bool isMoving() { return planner.has_blocks_queued(); }
+
+  float getAxisSteps_per_mm(const axis_t axis) {
+    switch (axis) {
+      case X: case Y: case Z:
+        return planner.axis_steps_per_mm[axis];
+      case E0: case E1: case E2: case E3: case E4: case E5:
+        return planner.axis_steps_per_mm[E_AXIS_N(axis - E0)];
+      default: return 0;
+    }
+  }
+
+  void setAxisSteps_per_mm(const axis_t axis, const float steps_per_mm) {
+    switch (axis) {
+      case X: case Y: case Z:
+        planner.axis_steps_per_mm[axis] = steps_per_mm;
+        break;
+      case E0: case E1: case E2: case E3: case E4: case E5:
+        planner.axis_steps_per_mm[E_AXIS_N(axis - E0)] = steps_per_mm;
+        break;
+    }
+  }
+
+  float getAxisMaxFeedrate_mm_s(const axis_t axis) {
+    switch (axis) {
+      case X: case Y: case Z:
+        return planner.max_feedrate_mm_s[axis];
+      case E0: case E1: case E2: case E3: case E4: case E5:
+        return planner.max_feedrate_mm_s[E_AXIS_N(axis - E0)];
+      default: return 0;
+    }
+  }
+
+  void setAxisMaxFeedrate_mm_s(const axis_t axis, const float max_feedrate_mm_s) {
+    switch (axis) {
+      case X: case Y: case Z:
+        planner.max_feedrate_mm_s[axis] = max_feedrate_mm_s;
+        break;
+      case E0: case E1: case E2: case E3: case E4: case E5:
+        planner.max_feedrate_mm_s[E_AXIS_N(axis - E0)] = max_feedrate_mm_s;
+        break;
+      default: return;
+    }
+  }
+
+  float getAxisMaxAcceleration_mm_s2(const axis_t axis) {
+    switch (axis) {
+      case X: case Y: case Z:
+        return planner.max_acceleration_mm_per_s2[axis];
+      case E0: case E1: case E2: case E3: case E4: case E5:
+        return planner.max_acceleration_mm_per_s2[E_AXIS_N(axis - E0)];
+      default: return 0;
+    }
+  }
+
+  void setAxisMaxAcceleration_mm_s2(const axis_t axis, const float max_acceleration_mm_per_s2) {
+    switch (axis) {
+      case X: case Y: case Z:
+        planner.max_acceleration_mm_per_s2[axis] = max_acceleration_mm_per_s2;
+        break;
+      case E0: case E1: case E2: case E3: case E4: case E5:
+        planner.max_acceleration_mm_per_s2[E_AXIS_N(axis - E0)] = max_acceleration_mm_per_s2;
+        break;
+      default: return;
+    }
+  }
+
+  #if ENABLED(LIN_ADVANCE)
+    float getLinearAdvance_mm_mm_s(const uint8_t extruder) {
+      return (extruder < EXTRUDERS) ? planner.extruder_advance_K[extruder] : 0;
+    }
+
+    void setLinearAdvance_mm_mm_s(const uint8_t extruder, const float k) {
+      if (extruder < EXTRUDERS)
+        planner.extruder_advance_K[extruder] = clamp(k, 0, 999);
+    }
+  #endif
+
+  #if ENABLED(JUNCTION_DEVIATION)
+    float getJunctionDeviation_mm() {
+      return planner.junction_deviation_mm;
+    }
+
+    void setJunctionDeviation_mm(const float junc_dev) {
+      planner.junction_deviation_mm = clamp(junc_dev, 0.01, 0.3);
+      planner.recalculate_max_e_jerk();
+    }
+  #else
+    float getAxisMaxJerk_mm_s(const axis_t axis) {
+      switch (axis) {
+        case X: case Y: case Z:
+          return planner.max_jerk[axis];
+        case E0: case E1: case E2: case E3: case E4: case E5:
+          return planner.max_jerk[E_AXIS];
+        default: return 0;
+      }
+    }
+
+    void setAxisMaxJerk_mm_s(const axis_t axis, const float max_jerk) {
+      switch (axis) {
+        case X: case Y: case Z:
+          planner.max_jerk[axis] = max_jerk;
+          break;
+        case E0: case E1: case E2: case E3: case E4: case E5:
+          planner.max_jerk[E_AXIS] = max_jerk;
+          break;
+        default: return;
+      }
+    }
+  #endif
+
+  float getMinFeedrate_mm_s()                             { return planner.min_feedrate_mm_s; }
+  float getMinTravelFeedrate_mm_s()                       { return planner.min_travel_feedrate_mm_s; }
+  float getPrintingAcceleration_mm_s2()                   { return planner.acceleration; }
+  float getRetractAcceleration_mm_s2()                    { return planner.retract_acceleration; }
+  float getTravelAcceleration_mm_s2()                     { return planner.travel_acceleration; }
+  void setMinFeedrate_mm_s(const float fr)                { planner.min_feedrate_mm_s = fr; }
+  void setMinTravelFeedrate_mm_s(const float fr)          { planner.min_travel_feedrate_mm_s = fr; }
+  void setPrintingAcceleration_mm_per_s2(const float acc) { planner.acceleration = acc; }
+  void setRetractAcceleration_mm_s2(const float acc)      { planner.retract_acceleration = acc; }
+  void setTravelAcceleration_mm_s2(const float acc)       { planner.travel_acceleration = acc; }
+
+  #if ENABLED(BABYSTEP_ZPROBE_OFFSET)
+    float getZOffset_mm() {
+      #if ENABLED(BABYSTEP_HOTEND_Z_OFFSET)
+        if (active_extruder != 0)
+          return hotend_offset[Z_AXIS][active_extruder];
+        else
+      #endif
+          return zprobe_zoffset;
+    }
+
+    void setZOffset_mm(const float zoffset_mm) {
+      const float diff = (zoffset_mm - getZOffset_mm()) / planner.steps_to_mm[Z_AXIS];
+      incrementZOffset_steps(diff > 0 ? ceil(diff) : floor(diff));
+    }
+
+    void incrementZOffset_steps(int16_t babystep_increment) {
+      #if ENABLED(BABYSTEP_HOTEND_Z_OFFSET)
+        const bool do_probe = (active_extruder == 0);
+      #else
+        constexpr bool do_probe = true;
+      #endif
+      const float diff = planner.steps_to_mm[Z_AXIS] * babystep_increment,
+                  new_probe_offset = zprobe_zoffset + diff,
+                  new_offs =
+                    #if ENABLED(BABYSTEP_HOTEND_Z_OFFSET)
+                      do_probe ? new_probe_offset : hotend_offset[Z_AXIS][active_extruder] - diff
+                    #else
+                      new_probe_offset
+                    #endif
+                  ;
+      if (WITHIN(new_offs, Z_PROBE_OFFSET_RANGE_MIN, Z_PROBE_OFFSET_RANGE_MAX)) {
+
+        thermalManager.babystep_axis(Z_AXIS, babystep_increment);
+
+        if (do_probe) zprobe_zoffset = new_offs;
+        #if ENABLED(BABYSTEP_HOTEND_Z_OFFSET)
+          else hotend_offset[Z_AXIS][active_extruder] = new_offs;
+        #endif
+      }
+    }
+  #endif // ENABLED(BABYSTEP_ZPROBE_OFFSET)
+
+  #if HOTENDS > 1
+    float getNozzleOffset_mm(const axis_t axis, uint8_t extruder) {
+      if (extruder >= HOTENDS) return 0;
+      return hotend_offset[axis][extruder];
+    }
+
+    void setNozzleOffset_mm(const axis_t axis, uint8_t extruder, float offset) {
+      if (extruder >= HOTENDS) return;
+      hotend_offset[axis][extruder] = offset;
+    }
+  #endif
+
+  #if ENABLED(BACKLASH_GCODE)
+    float getAxisBacklash_mm(const axis_t axis)       {return backlash_distance_mm[axis];}
+    void setAxisBacklash_mm(const axis_t axis, float distance)
+                                                      {backlash_distance_mm[axis] = clamp(distance,0,5);}
+
+    float getBacklashCorrection_percent()             {return backlash_correction*100;}
+    void setBacklashCorrection_percent(float percent) {backlash_correction = clamp(percent, 0, 100)/100;}
+
+    #ifdef BACKLASH_SMOOTHING_MM
+      float getBacklashSmoothing_mm()                 {return backlash_smoothing_mm;}
+      void setBacklashSmoothing_mm(float distance)    {backlash_smoothing_mm = clamp(distance,0,999);}
+    #endif
+  #endif
+
+  uint8_t getProgress_percent() {
+    #if ENABLED(SDSUPPORT)
+      return card.percentDone();
+    #else
+      return 0;
+    #endif
+  }
+
+  uint32_t getProgress_seconds_elapsed() {
+    const duration_t elapsed = print_job_timer.duration();
+    return elapsed.value;
+  }
+
+  float getFeedRate_percent() {
+    return feedrate_percentage;
+  }
+
+  void enqueueCommands(progmem_str gcode) {
+    enqueue_and_echo_commands_P((PGM_P)gcode);
+  }
+
+  bool isAxisPositionKnown(const axis_t axis) {
+    switch (axis) {
+      case X: case Y: case Z:
+        return TEST(axis_known_position, axis);
+      default: return true;
+    }
+  }
+
+  progmem_str getFirmwareName() {
+    return F("Marlin " SHORT_BUILD_VERSION);
+  }
+
+  void setTargetTemp_celsius(const uint8_t extruder, float temp) {
+    if (extruder)
+      thermalManager.setTargetHotend(clamp(temp,0,500), extruder-1);
+    #if HAS_HEATED_BED
+      else
+        thermalManager.setTargetBed(clamp(temp,0,200));
+    #endif
+  }
+
+  void setFan_percent(const uint8_t fan, float percent) {
+    if (fan < FAN_COUNT)
+      fan_speed[fan] = clamp(round(percent * 255 / 100), 0, 255);
+  }
+
+  void setFeedrate_percent(const float percent) {
+    feedrate_percentage = clamp(percent, 10, 500);
+  }
+
+  void printFile(const char *filename) {
+    #if ENABLED(SDSUPPORT)
+      card.openAndPrintFile(filename);
+    #endif
+  }
+
+  bool isPrintingFromMedia() {
+    #if ENABLED(SDSUPPORT)
+      return card.cardOK && card.isFileOpen() && card.sdprinting;
+    #else
+      return false;
+    #endif
+  }
+
+  bool isPrinting() {
+    return (planner.movesplanned() || IS_SD_PRINTING ||
+      #if ENABLED(SDSUPPORT)
+        (card.cardOK && card.isFileOpen())
+      #else
+        false
+      #endif
+    );
+  }
+
+  bool isMediaInserted() {
+    #if ENABLED(SDSUPPORT)
+      return IS_SD_INSERTED && card.cardOK;
+    #else
+      return false;
+    #endif
+  }
+
+  void pausePrint() {
+    #if ENABLED(SDSUPPORT)
+      card.pauseSDPrint();
+      print_job_timer.pause();
+      #if ENABLED(PARK_HEAD_ON_PAUSE)
+        enqueue_and_echo_commands_P(PSTR("M125"));
+      #endif
+      UI::onStatusChanged(PSTR(MSG_PRINT_PAUSED));
+    #endif
+  }
+
+  void resumePrint() {
+    #if ENABLED(SDSUPPORT)
+      #if ENABLED(PARK_HEAD_ON_PAUSE)
+        enqueue_and_echo_commands_P(PSTR("M24"));
+      #else
+        card.startFileprint();
+        print_job_timer.start();
+      #endif
+      UI::onStatusChanged(PSTR(MSG_PRINTING));
+    #endif
+  }
+
+  void stopPrint() {
+    #if ENABLED(SDSUPPORT)
+      wait_for_heatup = wait_for_user = false;
+      abort_sd_printing = true;
+      UI::onStatusChanged(PSTR(MSG_PRINT_ABORTED));
+    #endif
+  }
+
+  FileList::FileList() {
+    refresh();
+  }
+
+  void FileList::refresh() {
+    num_files = 0xFFFF;
+  }
+
+  bool FileList::seek(uint16_t pos, bool skip_range_check) {
+    #if ENABLED(SDSUPPORT)
+      if (!skip_range_check && pos > (count() - 1)) return false;
+      const uint16_t nr =
+        #if ENABLED(SDCARD_RATHERRECENTFIRST) && DISABLED(SDCARD_SORT_ALPHA)
+          count() - 1 -
+        #endif
+      pos;
+
+      #if ENABLED(SDCARD_SORT_ALPHA)
+        card.getfilename_sorted(nr);
+      #else
+        card.getfilename(nr);
+      #endif
+      return card.filename && card.filename[0] != '\0';
+    #endif
+  }
+
+  const char* FileList::filename() {
+    #if ENABLED(SDSUPPORT)
+      return (card.longFilename && card.longFilename[0]) ? card.longFilename : card.filename;
+    #else
+      return "";
+    #endif
+  }
+
+  const char* FileList::shortFilename() {
+    #if ENABLED(SDSUPPORT)
+      return card.filename;
+    #else
+      return "";
+    #endif
+  }
+
+  const char* FileList::longFilename() {
+    #if ENABLED(SDSUPPORT)
+      return card.longFilename;
+    #else
+      return "";
+    #endif
+  }
+
+  bool FileList::isDir() {
+    #if ENABLED(SDSUPPORT)
+      return card.filenameIsDir;
+    #else
+      return false;
+    #endif
+  }
+
+  uint16_t FileList::count() {
+    #if ENABLED(SDSUPPORT)
+      if (num_files == 0xFFFF) num_files = card.get_num_Files();
+      return num_files;
+    #endif
+  }
+
+  bool FileList::isAtRootDir() {
+    #if ENABLED(SDSUPPORT)
+      card.getWorkDirName();
+      return card.filename[0] == '/';
+    #else
+      return true;
+    #endif
+  }
+
+  void FileList::upDir() {
+    #if ENABLED(SDSUPPORT)
+      card.updir();
+      num_files = 0xFFFF;
+    #endif
+  }
+
+  void FileList::changeDir(const char *dirname) {
+    #if ENABLED(SDSUPPORT)
+      card.chdir(dirname);
+      num_files = 0xFFFF;
+    #endif
+  }
+
+} // namespace UI
+
+// At the moment, we piggy-back off the ultralcd calls, but this could be cleaned up in the future
+
+void lcd_init() {
+  #if ENABLED(SDSUPPORT) && PIN_EXISTS(SD_DETECT)
+    SET_INPUT_PULLUP(SD_DETECT_PIN);
+  #endif
+  UI::onStartup();
+}
+
+void lcd_update()                                                                {
+  #if ENABLED(SDSUPPORT)
+    static bool last_sd_status;
+    const bool sd_status = IS_SD_INSERTED;
+    if (sd_status != last_sd_status) {
+      last_sd_status = sd_status;
+      if (sd_status) {
+        card.initsd();
+        if (card.cardOK)
+          UI::onMediaInserted();
+        else
+          UI::onMediaError();
+      }
+      else {
+        const bool ok = card.cardOK;
+        card.release();
+        if (ok)
+          UI::onMediaRemoved();
+      }
+    }
+  #endif // SDSUPPORT
+  UI::onUpdate();
+}
+
+bool lcd_hasstatus()                                                             { return true; }
+bool lcd_detected()                                                              { return true; }
+void lcd_reset_alert_level()                                                     {}
+void lcd_refresh()                                                               {}
+void lcd_setstatus(const char * const message, const bool persist /* = false */) { UI::onStatusChanged(message); }
+void lcd_setstatusPGM(const char * const message, int8_t level /* = 0 */)        { UI::onStatusChanged((progmem_str)message); }
+void lcd_reset_status()                                                          {}
+void lcd_setalertstatusPGM(const char * const message)                           { lcd_setstatusPGM(message, 0); }
+void lcd_status_printf_P(const uint8_t level, const char * const fmt, ...) {
+  char buff[64];
+  va_list args;
+  va_start(args, fmt);
+  vsnprintf_P(buff, sizeof(buff), fmt, args);
+  va_end(args);
+  buff[63] = '\0';
+  UI::onStatusChanged(buff);
+}
+
+#endif // EXTENSIBLE_UI

Marlin/src/lcd/extensible_ui/ui_api.h

@@ -0,0 +1,164 @@
+/************
+ * ui_api.h *
+ ************/
+
+/****************************************************************************
+ *   Written By Marcio Teixeira 2018 - Aleph Objects, Inc.                  *
+ *                                                                          *
+ *   This program is free software: you can redistribute it and/or modify   *
+ *   it under the terms of the GNU General Public License as published by   *
+ *   the Free Software Foundation, either version 3 of the License, or      *
+ *   (at your option) any later version.                                    *
+ *                                                                          *
+ *   This program is distributed in the hope that it will be useful,        *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of         *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the          *
+ *   GNU General Public License for more details.                           *
+ *                                                                          *
+ *   To view a copy of the GNU General Public License, go to the following  *
+ *   location: <http://www.gnu.org/licenses/>.                              *
+ ****************************************************************************/
+
+#pragma once
+
+#include "../../inc/MarlinConfig.h"
+
+typedef const __FlashStringHelper *progmem_str;
+
+namespace UI {
+
+  enum axis_t : uint8_t { X, Y, Z, E0, E1, E2, E3, E4, E5 };
+
+  constexpr uint8_t extruderCount = EXTRUDERS;
+  constexpr uint8_t fanCount      = FAN_COUNT;
+
+  // The following methods should be used by the extension module to
+  // query or change Marlin's state.
+
+  progmem_str getFirmwareName();
+
+  bool isAxisPositionKnown(const axis_t axis);
+  bool isMoving();
+
+  float getActualTemp_celsius(const uint8_t extruder);
+  float getTargetTemp_celsius(const uint8_t extruder);
+  float getFan_percent(const uint8_t fan);
+  float getAxisPosition_mm(const axis_t axis);
+  float getAxisSteps_per_mm(const axis_t axis);
+  float getAxisMaxFeedrate_mm_s(const axis_t axis);
+  float getAxisMaxAcceleration_mm_s2(const axis_t axis);
+  float getMinFeedrate_mm_s();
+  float getMinTravelFeedrate_mm_s();
+  float getPrintingAcceleration_mm_per_s2();
+  float getRetractAcceleration_mm_per_s2();
+  float getTravelAcceleration_mm_per_s2();
+  float getFeedRate_percent();
+  uint8_t getProgress_percent();
+  uint32_t getProgress_seconds_elapsed();
+
+  void setTargetTemp_celsius(const uint8_t extruder, float temp);
+  void setFan_percent(const uint8_t fan, const float percent);
+  void setAxisPosition_mm(const axis_t axis, float position, float _feedrate_mm_s);
+  void setAxisSteps_per_mm(const axis_t axis, const float steps_per_mm);
+  void setAxisMaxFeedrate_mm_s(const axis_t axis, const float max_feedrate_mm_s);
+  void setAxisMaxAcceleration_mm_s2(const axis_t axis, const float max_acceleration_mm_per_s2);
+  void setMinFeedrate_mm_s(const float min_feedrate_mm_s);
+  void setMinTravelFeedrate_mm_s(const float min_travel_feedrate_mm_s);
+  void setPrintingAcceleration_mm_s2(const float acceleration);
+  void setRetractAcceleration_mm_s2(const float retract_acceleration);
+  void setTravelAcceleration_mm_s2(const float travel_acceleration);
+  void setFeedrate_percent(const float percent);
+
+  #if ENABLED(LIN_ADVANCE)
+    float getLinearAdvance_mm_mm_s(const uint8_t extruder);
+    void setLinearAdvance_mm_mm_s(const uint8_t extruder, const float k);
+  #endif
+
+  #if ENABLED(JUNCTION_DEVIATION)
+    float getJunctionDeviation_mm();
+    void setJunctionDeviation_mm(const float junc_dev);
+  #else
+    float getAxisMaxJerk_mm_s(const axis_t axis);
+    void setAxisMaxJerk_mm_s(const axis_t axis, const float max_jerk);
+  #endif
+
+  void setActiveTool(uint8_t extruder, bool no_move);
+  uint8_t getActiveTool();
+
+  #if HOTENDS > 1
+    float getNozzleOffset_mm(const axis_t axis, uint8_t extruder);
+    void setNozzleOffset_mm(const axis_t axis, uint8_t extruder, float offset);
+  #endif
+
+  #if ENABLED(BABYSTEP_ZPROBE_OFFSET)
+    float getZOffset_mm();
+    void setZOffset_mm(const float zoffset_mm);
+    void incrementZOffset_steps(const int16_t babystep_increment);
+  #endif
+
+  #if ENABLED(BACKLASH_GCODE)
+    float getAxisBacklash_mm(const axis_t axis);
+    void setAxisBacklash_mm(const axis_t axis, float distance);
+
+    float getBacklashCorrection_percent();
+    void setBacklashCorrection_percent(float percent);
+
+    #ifdef BACKLASH_SMOOTHING_MM
+      float getBacklashSmoothing_mm();
+      void setBacklashSmoothing_mm(float distance);
+    #endif
+  #endif
+
+  void delay_ms(unsigned long ms);
+  void yield(); // Within lengthy loop, call this periodically
+
+  void enqueueCommands(progmem_str gcode);
+
+  void printFile(const char *filename);
+  bool isPrintingFromMedia();
+  bool isPrinting();
+  void stopPrint();
+  void pausePrint();
+  void resumePrint();
+
+  bool isMediaInserted();
+
+  class FileList {
+    private:
+      uint16_t num_files;
+
+    public:
+      FileList();
+      void        refresh();
+      bool        seek(uint16_t, bool skip_range_check = false);
+
+      const char *longFilename();
+      const char *shortFilename();
+      const char *filename();
+      bool        isDir();
+
+      void        changeDir(const char *dirname);
+      void        upDir();
+      bool        isAtRootDir();
+      uint16_t    count();
+  };
+
+  // The following event handlers are to be declared by the extension
+  // module and will be called by Marlin.
+
+  void onStartup();
+  void onUpdate();
+  void onMediaInserted();
+  void onMediaError();
+  void onMediaRemoved();
+  void onPlayTone(const uint16_t frequency, const uint16_t duration);
+  void onPrinterKilled(const char* msg);
+  void onPrintTimerStarted();
+  void onPrintTimerPaused();
+  void onPrintTimerStopped();
+  void onFilamentRunout();
+  void onStatusChanged(const char* msg);
+  void onStatusChanged(progmem_str msg);
+  void onFactoryReset();
+  void onStoreSettings();
+};

Marlin/src/lcd/ultralcd.h

@@ -25,7 +25,7 @@
 
 #include "../inc/MarlinConfig.h"
 
-#if ENABLED(ULTRA_LCD) || ENABLED(MALYAN_LCD)
+#if ENABLED(ULTRA_LCD) || ENABLED(MALYAN_LCD) || ENABLED(EXTENSIBLE_UI)
   void lcd_init();
   bool lcd_detected();
   void lcd_update();
@@ -208,6 +208,15 @@
     void wait_for_release();
   #endif
 
+#elif ENABLED(EXTENSIBLE_UI)
+  // These functions are defined elsewhere
+  void lcd_setstatus(const char* const message, const bool persist=false);
+  void lcd_setstatusPGM(const char* const message, const int8_t level=0);
+  void lcd_status_printf_P(const uint8_t level, const char * const fmt, ...);
+  void lcd_reset_status();
+  void lcd_refresh();
+  void lcd_reset_alert_level();
+  bool lcd_hasstatus();
 #else // MALYAN_LCD or no LCD
 
   constexpr bool lcd_wait_for_move = false;
@@ -279,7 +288,7 @@
   void lcd_reselect_last_file();
 #endif
 
-#if ENABLED(ULTIPANEL) && ENABLED(SDSUPPORT)
+#if (ENABLED(EXTENSIBLE_UI) || ENABLED(ULTIPANEL)) && ENABLED(SDSUPPORT)
   extern bool abort_sd_printing;
 #else
   constexpr bool abort_sd_printing = false;

Marlin/src/libs/buzzer.cpp

@@ -27,6 +27,10 @@
 #include "buzzer.h"
 #include "../module/temperature.h"
 
+#if ENABLED(EXTENSIBLE_UI)
+  #include "../lcd/extensible_ui/ui_api.h"
+#endif
+
 Buzzer::state_t Buzzer::state;
 CircularQueue<tone_t, TONE_QUEUE_LENGTH> Buzzer::buffer;
 Buzzer buzzer;
@@ -58,7 +62,11 @@ void Buzzer::tick() {
     state.endtime = now + state.tone.duration;
 
     if (state.tone.frequency > 0) {
-      #if ENABLED(SPEAKER)
+      #if ENABLED(EXTENSIBLE_UI)
+        CRITICAL_SECTION_START;
+        UI::onPlayTone(state.tone.frequency, state.tone.duration);
+        CRITICAL_SECTION_END;
+      #elif ENABLED(SPEAKER)
         CRITICAL_SECTION_START;
         ::tone(BEEPER_PIN, state.tone.frequency, state.tone.duration);
         CRITICAL_SECTION_END;

Marlin/src/libs/buzzer.h

@@ -28,7 +28,7 @@
 // Make a buzzer and macro
 #if ENABLED(LCD_USE_I2C_BUZZER)
   // BUZZ() will be defined in ultralcd.h
-#elif PIN_EXISTS(BEEPER)
+#elif PIN_EXISTS(BEEPER) || ENABLED(EXTENSIBLE_UI)
 
 #include "circularqueue.h"
 

Marlin/src/pins/pins_ARCHIM2.h

@@ -163,22 +163,21 @@
 //
 #define SDSS               87   // D87 PA29 CS
 
-//////////////////////////
-// LCDs and Controllers //
-//////////////////////////
-
-#if ENABLED(ULTRA_LCD)
-  #if ENABLED(NEWPANEL)
-    #define BEEPER_PIN     23   // D24 PA15_CTS1
-    #define LCD_PINS_RS    17   // D17 PA12_RXD1
-    #define LCD_PINS_ENABLE 24  // D23 PA14_RTS1
-    #define LCD_PINS_D4    69   // D69 PA0_CANTX0
-    #define LCD_PINS_D5    54   // D54 PA16_SCK1
-    #define LCD_PINS_D6    68   // D68 PA1_CANRX0
-    #define LCD_PINS_D7    34   // D34 PC2_PWML0
+//
+// LCD / Controller
+//
+#if ENABLED(ULTRA_LCD) || ENABLED(EXTENSIBLE_UI)
+  #define BEEPER_PIN       23   // D24 PA15_CTS1
+  #define LCD_PINS_RS      17   // D17 PA12_RXD1
+  #define LCD_PINS_ENABLE  24   // D23 PA14_RTS1
+  #define LCD_PINS_D4      69   // D69 PA0_CANTX0
+  #define LCD_PINS_D5      54   // D54 PA16_SCK1
+  #define LCD_PINS_D6      68   // D68 PA1_CANRX0
+  #define LCD_PINS_D7      34   // D34 PC2_PWML0
 
-    #define SD_DETECT_PIN   2   // D2  PB25_TIOA0
+  #define SD_DETECT_PIN     2   // D2  PB25_TIOA0
 
+  #if ENABLED(NEWPANEL)
     // Buttons on AUX-2
     #define BTN_EN1        60   // D60 PA3_TIOB1
     #define BTN_EN2        13   // D13 PB27_TIOB0