Optimize some G-code strings

Marlin/src/gcode/calibrate/G76_M192_M871.cpp

@@ -38,7 +38,7 @@
 #include "../../feature/probe_temp_comp.h"
 
 #include "../../lcd/marlinui.h"
-#include "../../MarlinCore.h" // for wait_for_heatup and idle()
+#include "../../MarlinCore.h" // for wait_for_heatup, idle(), G28_STR
 
 #if ENABLED(PRINTJOB_TIMER_AUTOSTART)
   #include "../../module/printcounter.h"
@@ -168,7 +168,7 @@ void GcodeSuite::G76() {
       return;
     }
 
-    process_subcommands_now_P(PSTR("G28"));
+    process_subcommands_now_P(G28_STR);
   }
 
   remember_feedrate_scaling_off();

Marlin/src/lcd/dwin/e3v2/dwin.cpp

@@ -2332,7 +2332,7 @@ void HMI_Prepare() {
       case PREPARE_CASE_HOME: // Homing
         checkkey = Last_Prepare;
         index_prepare = MROWS;
-        queue.inject_P(PSTR("G28")); // G28 will set home_flag
+        queue.inject_P(G28_STR); // G28 will set home_flag
         Popup_Window_Home();
         break;
       #if HAS_ZOFFSET_ITEM

Marlin/src/lcd/extui/lib/anycubic_chiron/chiron_tft.cpp

@@ -623,7 +623,7 @@ namespace Anycubic {
             case 'X': injectCommands_P(PSTR("G28X")); break;
             case 'Y': injectCommands_P(PSTR("G28Y")); break;
             case 'Z': injectCommands_P(PSTR("G28Z")); break;
-            case 'C': injectCommands_P(PSTR("G28")); break;
+            case 'C': injectCommands_P(G28_STR); break;
           }
         }
         break;
@@ -718,7 +718,7 @@ namespace Anycubic {
           // If the same meshpoint is selected twice in a row, move the head to that ready for adjustment
           if ((selectedmeshpoint.x == pos.x) && (selectedmeshpoint.y == pos.y)) {
             if (!isPositionKnown())
-              injectCommands_P(PSTR("G28")); // home
+              injectCommands_P(G28_STR); // home
 
             if (isPositionKnown()) {
               #if ACDEBUG(AC_INFO)
@@ -746,7 +746,7 @@ namespace Anycubic {
           if (isPrinting())
             SendtoTFTLN(AC_msg_probing_not_allowed); // forbid auto leveling
           else {
-            injectCommands_P(isMachineHomed() ? PSTR("G29") : PSTR("G28\nG29"));
+            injectCommands_P(PSTR("G28O\nG29"));
             printer_state = AC_printer_probing;
             SendtoTFTLN(AC_msg_start_probing);
           }

Marlin/src/lcd/extui/lib/anycubic_chiron/chiron_tft_defs.h

@@ -105,7 +105,7 @@
 
 #define AC_cmnd_manual_load_filament   PSTR("M83\nG1 E50 F700\nM82")   // replace the manual panel commands with something a little faster
 #define AC_cmnd_manual_unload_filament PSTR("M83\nG1 E-50 F1200\nM82")
-#define AC_cmnd_enable_leveling        PSTR("M420 S1 V1")
+#define AC_cmnd_enable_leveling        PSTR("M420SV")
 #define AC_cmnd_power_loss_recovery    PSTR("G28XYR5\nG28Z")           // Lift, home X and Y then home Z when in 'safe' position
 
 namespace Anycubic {

Marlin/src/lcd/extui/lib/anycubic_i3mega/anycubic_i3mega_lcd.cpp

@@ -28,7 +28,7 @@
 
 #include "../../../../libs/numtostr.h"
 #include "../../../../module/motion.h"  // for A20 read printing speed feedrate_percentage
-#include "../../../../MarlinCore.h"     // for quickstop_stepper and disable_steppers
+#include "../../../../MarlinCore.h"     // for quickstop_stepper, disable_steppers, G28_STR
 #include "../../../../inc/MarlinConfig.h"
 
 // command sending macro's with debugging capability
@@ -765,7 +765,7 @@ void AnycubicTFTClass::GetCommandFromTFT() {
                   ExtUI::injectCommands_P(PSTR("G28Z"));
               }
               else if (CodeSeen('C')) {
-                ExtUI::injectCommands_P(PSTR("G28"));
+                ExtUI::injectCommands_P(G28_STR);
               }
             }
             break;

Marlin/src/lcd/extui/lib/mks_ui/draw_home.cpp

@@ -31,6 +31,8 @@
 #include "../../../../gcode/queue.h"
 #include "../../../../inc/MarlinConfig.h"
 
+extern const char G28_STR[];
+
 extern lv_group_t *g;
 static lv_obj_t *scr;
 
@@ -48,16 +50,16 @@ static void event_handler(lv_obj_t *obj, lv_event_t event) {
   if (event != LV_EVENT_RELEASED) return;
   switch (obj->mks_obj_id) {
     case ID_H_ALL:
-      queue.inject_P(PSTR("G28"));
+      queue.inject_P(G28_STR);
       break;
     case ID_H_X:
-      queue.inject_P(PSTR("G28 X0"));
+      queue.inject_P(PSTR("G28X"));
       break;
     case ID_H_Y:
-      queue.inject_P(PSTR("G28 Y0"));
+      queue.inject_P(PSTR("G28Y"));
       break;
     case ID_H_Z:
-      queue.inject_P(PSTR("G28 Z0"));
+      queue.inject_P(PSTR("G28Z"));
       break;
     case ID_H_OFF_ALL:
       queue.inject_P(PSTR("M84"));

Marlin/src/lcd/extui/lib/mks_ui/draw_manuaLevel.cpp

@@ -29,6 +29,8 @@
 #include "../../../../gcode/queue.h"
 #include "../../../../inc/MarlinConfig.h"
 
+extern const char G28_STR[];
+
 extern lv_group_t *g;
 static lv_obj_t *scr;
 
@@ -45,65 +47,15 @@ static void event_handler(lv_obj_t *obj, lv_event_t event) {
   if (event != LV_EVENT_RELEASED) return;
 
   switch (obj->mks_obj_id) {
-    case ID_M_POINT1:
+    case ID_M_POINT1 ... ID_M_POINT5:
       if (queue.length == 0) {
         if (uiCfg.leveling_first_time) {
-          queue.enqueue_now_P(PSTR("G28"));
+          uiCfg.leveling_first_time = false;
-          uiCfg.leveling_first_time = 0;
+          queue.inject_P(G28_STR);
         }
-        queue.enqueue_now_P(PSTR("G1 Z10"));
+        const int ind = obj->mks_obj_id - ID_M_POINT1;
-        sprintf_P(public_buf_l, PSTR("G1 X%d Y%d"), (int)gCfgItems.levelingPos[0][0], (int)gCfgItems.levelingPos[0][1]);
+        sprintf_P(public_buf_l, PSTR("G1 Z10\nG1 X%d Y%d\nG1 Z0"), (int)gCfgItems.levelingPos[ind][0], (int)gCfgItems.levelingPos[ind][1]);
-        queue.enqueue_one_now(public_buf_l);
+        queue.inject(public_buf_l);
-        queue.enqueue_now_P(PSTR("G1 Z0"));
-      }
-      break;
-    case ID_M_POINT2:
-      if (queue.length == 0) {
-        if (uiCfg.leveling_first_time) {
-          queue.enqueue_now_P(PSTR("G28"));
-          uiCfg.leveling_first_time = 0;
-        }
-        queue.enqueue_now_P(PSTR("G1 Z10"));
-        sprintf_P(public_buf_l, PSTR("G1 X%d Y%d"), (int)gCfgItems.levelingPos[1][0], (int)gCfgItems.levelingPos[1][1]);
-        queue.enqueue_one_now(public_buf_l);
-        queue.enqueue_now_P(PSTR("G1 Z0"));
-      }
-      break;
-    case ID_M_POINT3:
-      if (queue.length == 0) {
-        if (uiCfg.leveling_first_time) {
-          queue.enqueue_now_P(PSTR("G28"));
-          uiCfg.leveling_first_time = 0;
-        }
-        queue.enqueue_now_P(PSTR("G1 Z10"));
-        sprintf_P(public_buf_l, PSTR("G1 X%d Y%d"), (int)gCfgItems.levelingPos[2][0], (int)gCfgItems.levelingPos[2][1]);
-        queue.enqueue_one_now(public_buf_l);
-        queue.enqueue_now_P(PSTR("G1 Z0"));
-      }
-
-      break;
-    case ID_M_POINT4:
-      if (queue.length == 0) {
-        if (uiCfg.leveling_first_time) {
-          queue.enqueue_now_P(PSTR("G28"));
-          uiCfg.leveling_first_time = 0;
-        }
-        queue.enqueue_now_P(PSTR("G1 Z10"));
-        sprintf_P(public_buf_l, PSTR("G1 X%d Y%d"), (int)gCfgItems.levelingPos[3][0], (int)gCfgItems.levelingPos[3][1]);
-        queue.enqueue_one_now(public_buf_l);
-        queue.enqueue_now_P(PSTR("G1 Z0"));
-      }
-      break;
-    case ID_M_POINT5:
-      if (queue.length == 0) {
-        if (uiCfg.leveling_first_time) {
-          queue.enqueue_now_P(PSTR("G28"));
-          uiCfg.leveling_first_time = 0;
-        }
-        queue.enqueue_now_P(PSTR("G1 Z10"));
-        sprintf_P(public_buf_l, PSTR("G1 X%d Y%d"), (int)gCfgItems.levelingPos[4][0], (int)gCfgItems.levelingPos[4][1]);
-        queue.enqueue_one_now(public_buf_l);
-        queue.enqueue_now_P(PSTR("G1 Z0"));
       }
       break;
     case ID_MANUAL_RETURN: