Add pause/resume to USB/host prints via LCD menu

Depending if SD or USB/host print the firmware sends
- SD print: `// action:paused` or `// action:resumed` are send to inform USB/Host
- USB/host print: `// action:pause` or `// action:resume` are send to trigger the USB/host to handle it

- USB/host must handle `// action:pause` and `// action:resume` correctly to work
  - Tested with Octoprint
    - It handles every thing correctly
    - Any combination of Octoprint and/or LCD `pause` and `resume` working correctly
  - Tested with Pronterface
    - It pauses BUT doesn't send the printer in pause position, and so it is not possible to `resume` from LCD menu
    - I guess some Macros can fix that.
  - Repetier Host/Server documentation shows that it should work. Not tested.

Could save 56 bytes in first step and additional 38 bytes adding `MSG_PAUSE_PRINT` to messages.c/.h

Updated `lang_en*.txt`
@todo Polish translation is 19 characters long (it still fits) BUT should be corrected to 18 chars.

Firmware/messages.c

@@ -70,6 +70,7 @@ const char MSG_MMU_LOAD_FAILS[] PROGMEM_I1 = ISTR("MMU load fails"); ////c=14
 const char MSG_NO[] PROGMEM_I1 = ISTR("No"); ////
 const char MSG_NOZZLE[] PROGMEM_I1 = ISTR("Nozzle"); ////
 const char MSG_PAPER[] PROGMEM_I1 = ISTR("Place a sheet of paper under the nozzle during the calibration of first 4 points. If the nozzle catches the paper, power off the printer immediately."); ////c=20 r=10
+const char MSG_PAUSE_PRINT[] PROGMEM_I1 = ISTR("Pause print");////c=18
 const char MSG_PLACE_STEEL_SHEET[] PROGMEM_I1 = ISTR("Please place steel sheet on heatbed."); ////c=20 r=4
 const char MSG_PLEASE_WAIT[] PROGMEM_I1 = ISTR("Please wait"); ////c=20
 const char MSG_POWER_FAILURES[] PROGMEM_I1 = ISTR("Power failures"); ////c=14
@@ -188,7 +189,9 @@ const char MSG_ENDSTOP_OPEN[] PROGMEM_N1 = "open"; ////
 const char MSG_POWERUP[] PROGMEM_N1 = "PowerUp"; ////
 const char MSG_ERR_STOPPED[] PROGMEM_N1 = "Printer stopped due to errors. Fix the error and use M999 to restart. (Temperature is reset. Set it after restarting)"; ////
 const char MSG_ENDSTOP_HIT[] PROGMEM_N1 = "TRIGGERED"; ////
+const char MSG_OCTOPRINT_PAUSE[] PROGMEM_N1 = "// action:pause"; ////
 const char MSG_OCTOPRINT_PAUSED[] PROGMEM_N1 = "// action:paused"; ////
+const char MSG_OCTOPRINT_RESUME[] PROGMEM_N1 = "// action:resume"; ////
 const char MSG_OCTOPRINT_RESUMED[] PROGMEM_N1 = "// action:resumed"; ////
 const char MSG_OCTOPRINT_CANCEL[] PROGMEM_N1 = "// action:cancel"; ////
 const char MSG_FANCHECK_EXTRUDER[] PROGMEM_N1 = "Err: EXTR. FAN ERROR"; ////c=20

Firmware/messages.h

@@ -69,6 +69,7 @@ extern const char MSG_MMU_LOAD_FAILS[];
 extern const char MSG_NO[];
 extern const char MSG_NOZZLE[];
 extern const char MSG_PAPER[];
+extern const char MSG_PAUSE_PRINT[];
 extern const char MSG_PLACE_STEEL_SHEET[];
 extern const char MSG_PLEASE_WAIT[];
 extern const char MSG_POWER_FAILURES[];
@@ -188,7 +189,9 @@ extern const char MSG_ERR_STOPPED[];
 extern const char MSG_ENDSTOP_HIT[];
 extern const char MSG_EJECT_FILAMENT[];
 extern const char MSG_CUT_FILAMENT[];
+extern const char MSG_OCTOPRINT_PAUSE[];
 extern const char MSG_OCTOPRINT_PAUSED[];
+extern const char MSG_OCTOPRINT_RESUME[];
 extern const char MSG_OCTOPRINT_RESUMED[];
 extern const char MSG_OCTOPRINT_CANCEL[];
 extern const char MSG_FANCHECK_EXTRUDER[];

Firmware/ultralcd.cpp

@@ -1539,6 +1539,12 @@ void lcd_pause_print()
     }
 }
 
+//! @brief Pause USB/host print, disable nozzle heater, move to park position
+void lcd_pause_usb_print()
+{
+  SERIAL_PROTOCOLLNRPGM(MSG_OCTOPRINT_PAUSE); //pause for octoprint
+}
+
 
 float move_menu_scale;
 static void lcd_move_menu_axis();
@@ -6497,6 +6503,12 @@ void lcd_resume_print()
     SERIAL_PROTOCOLLNRPGM(MSG_OCTOPRINT_RESUMED); //resume octoprint
 }
 
+//! @brief Resume paused USB/host print
+void lcd_resume_usb_print()
+{
+	SERIAL_PROTOCOLLNRPGM(MSG_OCTOPRINT_RESUME); //resume octoprint
+}
+
 static void change_sheet()
 {
 	eeprom_update_byte(&(EEPROM_Sheets_base->active_sheet), selected_sheet);
@@ -6631,44 +6643,50 @@ static void lcd_main_menu()
     MENU_ITEM_SUBMENU_P(_i("Preheat"), lcd_preheat_menu);////MSG_PREHEAT
   }
 
-
-  if(isPrintPaused && saved_printing_type == PRINTING_TYPE_USB)
+  if (mesh_bed_leveling_flag == false && homing_flag == false && !isPrintPaused)
   {
-#ifdef FANCHECK
-      if((fan_check_error == EFCE_FIXED) || (fan_check_error == EFCE_OK))
-          MENU_ITEM_SUBMENU_P(_T(MSG_RESUME_PRINT), lcd_resume_print);////MSG_RESUME_PRINT c=18
-#else
-      MENU_ITEM_SUBMENU_P(_T(MSG_RESUME_PRINT), lcd_resume_print);////MSG_RESUME_PRINT c=18
-#endif
+	if (IS_SD_PRINTING)
+	{
+		MENU_ITEM_FUNCTION_P(_T(MSG_PAUSE_PRINT), lcd_pause_print);////MSG_PAUSE_PRINT c=18
+	}
+	else if (is_usb_printing)
+	{
+		MENU_ITEM_FUNCTION_P(_T(MSG_PAUSE_PRINT), lcd_pause_usb_print);////MSG_PAUSE_PRINT c=18
+	}
   }
-
-#ifdef SDSUPPORT
-  if (card.cardOK || lcd_commands_type == LcdCommands::Layer1Cal)
+  if(isPrintPaused)
   {
-    if (card.isFileOpen())
-    {
-		if (mesh_bed_leveling_flag == false && homing_flag == false) {
-			if (card.sdprinting)
+	#ifdef FANCHECK
+		if((fan_check_error == EFCE_FIXED) || (fan_check_error == EFCE_OK))
+		{
+			if (is_usb_printing)
 			{
-				MENU_ITEM_FUNCTION_P(_i("Pause print"), lcd_pause_print);////MSG_PAUSE_PRINT
+				MENU_ITEM_SUBMENU_P(_T(MSG_RESUME_PRINT), lcd_resume_usb_print);////MSG_RESUME_PRINT c=18
 			}
-			else if(isPrintPaused)
+			else
 			{
-				#ifdef FANCHECK
-					if((fan_check_error == EFCE_FIXED) || (fan_check_error == EFCE_OK))
-						MENU_ITEM_SUBMENU_P(_T(MSG_RESUME_PRINT), lcd_resume_print);////MSG_RESUME_PRINT c=18
-				#else
-					MENU_ITEM_SUBMENU_P(_T(MSG_RESUME_PRINT), lcd_resume_print);////MSG_RESUME_PRINT c=18
-				#endif
-
+				MENU_ITEM_SUBMENU_P(_T(MSG_RESUME_PRINT), lcd_resume_print);////MSG_RESUME_PRINT c=18
 			}
-			MENU_ITEM_SUBMENU_P(_T(MSG_STOP_PRINT), lcd_sdcard_stop);
 		}
-	}
-	else if (lcd_commands_type == LcdCommands::Layer1Cal && mesh_bed_leveling_flag == false && homing_flag == false) {
-		//MENU_ITEM_SUBMENU_P(_T(MSG_STOP_PRINT), lcd_sdcard_stop);
-	}
-	else
+	#else
+		if (is_usb_printing)
+		{
+			MENU_ITEM_SUBMENU_P(_T(MSG_RESUME_PRINT), lcd_resume_usb_print);////MSG_RESUME_PRINT c=18
+		}
+		else
+		{
+			MENU_ITEM_SUBMENU_P(_T(MSG_RESUME_PRINT), lcd_resume_print);////MSG_RESUME_PRINT c=18
+		}
+	#endif //FANCHECK
+  }
+  if(IS_SD_PRINTING || is_usb_printing || isPrintPaused)
+  {
+	MENU_ITEM_SUBMENU_P(_T(MSG_STOP_PRINT), lcd_sdcard_stop);
+  }
+#ifdef SDSUPPORT //!@todo SDSUPPORT undefined creates several issues in source code
+  if (card.cardOK || lcd_commands_type == LcdCommands::Layer1Cal)
+  {
+	if (!card.isFileOpen())
 	{
 		if (!is_usb_printing && (lcd_commands_type != LcdCommands::Layer1Cal))
 		{
@@ -6680,7 +6698,7 @@ static void lcd_main_menu()
 		}
 #if SDCARDDETECT < 1
       MENU_ITEM_GCODE_P(_i("Change SD card"), PSTR("M21"));  // SD-card changed by user////MSG_CNG_SDCARD
-#endif
+#endif //SDCARDDETECT
     }
 	
   } else 
@@ -6689,9 +6707,9 @@ static void lcd_main_menu()
     MENU_ITEM_SUBMENU_P(_i("No SD card"), lcd_sdcard_menu);////MSG_NO_CARD
 #if SDCARDDETECT < 1
     MENU_ITEM_GCODE_P(_i("Init. SD card"), PSTR("M21")); // Manually initialize the SD-card via user interface////MSG_INIT_SDCARD
-#endif
+#endif //SDCARDDETECT
   }
-#endif
+#endif //SDSUPPORT
 
   if(!isPrintPaused && !IS_SD_PRINTING && !is_usb_printing && (lcd_commands_type != LcdCommands::Layer1Cal))
   {

lang/lang_en.txt

@@ -544,7 +544,7 @@
 #
 "Nozzle FAN"
 
-#MSG_PAUSE_PRINT
+#MSG_PAUSE_PRINT c=18
 "Pause print"
 
 #MSG_PID_RUNNING c=20 r=1

lang/lang_en_cz.txt

@@ -726,7 +726,7 @@
 "Nozzle FAN"
 "Vent. trysky"
 
-#MSG_PAUSE_PRINT
+#MSG_PAUSE_PRINT c=18
 "Pause print"
 "Pozastavit tisk"
 

lang/lang_en_de.txt

@@ -726,7 +726,7 @@
 "Nozzle FAN"
 "Duesevent."
 
-#MSG_PAUSE_PRINT
+#MSG_PAUSE_PRINT c=18
 "Pause print"
 "Druck pausieren"
 

lang/lang_en_es.txt

@@ -726,7 +726,7 @@
 "Nozzle FAN"
 "Vent. capa"
 
-#MSG_PAUSE_PRINT
+#MSG_PAUSE_PRINT c=18
 "Pause print"
 "Pausar impresion"
 

lang/lang_en_fr.txt

@@ -726,7 +726,7 @@
 "Nozzle FAN"
 "Vent. buse"
 
-#MSG_PAUSE_PRINT
+#MSG_PAUSE_PRINT c=18
 "Pause print"
 "Pause de l'impr."
 

lang/lang_en_it.txt

@@ -726,7 +726,7 @@
 "Nozzle FAN"
 "Ventola estrusore"
 
-#MSG_PAUSE_PRINT
+#MSG_PAUSE_PRINT c=18
 "Pause print"
 "Metti in pausa"
 

lang/lang_en_pl.txt

@@ -726,7 +726,7 @@
 "Nozzle FAN"
 "WentHotend"
 
-#MSG_PAUSE_PRINT
+#MSG_PAUSE_PRINT c=18
 "Pause print"
 "Wstrzymanie wydruku"