Add a mesh edit menu for MBL / ABL-Bilinear

Marlin/Configuration.h

@@ -1173,8 +1173,9 @@
 //#define LCD_BED_LEVELING
 
 #if ENABLED(LCD_BED_LEVELING)
-  #define MBL_Z_STEP 0.025    // Step size while manually probing Z axis.
-  #define LCD_PROBE_Z_RANGE 4 // Z Range centered on Z_MIN_POS for LCD Z adjustment
+  #define MESH_EDIT_Z_STEP  0.025 // (mm) Step size while manually probing Z axis.
+  #define LCD_PROBE_Z_RANGE 4     // (mm) Z Range centered on Z_MIN_POS for LCD Z adjustment
+  //#define MESH_EDIT_MENU        // Add a menu to edit mesh points
 #endif
 
 // Add a menu item to move between bed corners for manual bed adjustment

Marlin/src/config/default/Configuration.h

@@ -1173,8 +1173,9 @@
 //#define LCD_BED_LEVELING
 
 #if ENABLED(LCD_BED_LEVELING)
-  #define MBL_Z_STEP 0.025    // Step size while manually probing Z axis.
-  #define LCD_PROBE_Z_RANGE 4 // Z Range centered on Z_MIN_POS for LCD Z adjustment
+  #define MESH_EDIT_Z_STEP  0.025 // (mm) Step size while manually probing Z axis.
+  #define LCD_PROBE_Z_RANGE 4     // (mm) Z Range centered on Z_MIN_POS for LCD Z adjustment
+  //#define MESH_EDIT_MENU        // Add a menu to edit mesh points
 #endif
 
 // Add a menu item to move between bed corners for manual bed adjustment

Marlin/src/inc/SanityCheck.h

@@ -319,6 +319,8 @@
   #error "SWITCHING_TOOLHEAD_SECURITY_RAISE is now TOOLCHANGE_ZRAISE. Please update your configuration."
 #elif defined(G0_FEEDRATE) && G0_FEEDRATE == 0
   #error "G0_FEEDRATE is now used to set the G0 feedrate. Please update your configuration."
+#elif defined(MBL_Z_STEP)
+  #error "MBL_Z_STEP is now MESH_EDIT_Z_STEP. Please update your configuration."
 #endif
 
 #define BOARD_MKS_13     -47

Marlin/src/lcd/language/language_en.h

@@ -192,6 +192,15 @@
 #ifndef MSG_EDITING_STOPPED
   #define MSG_EDITING_STOPPED                 _UxGT("Mesh Editing Stopped")
 #endif
+#ifndef MSG_MESH_X
+  #define MSG_MESH_X                          _UxGT("Index X")
+#endif
+#ifndef MSG_MESH_Y
+  #define MSG_MESH_Y                          _UxGT("Index Y")
+#endif
+#ifndef MSG_MESH_EDIT_Z
+  #define MSG_MESH_EDIT_Z                     _UxGT("Z Value")
+#endif
 #ifndef MSG_USER_MENU
   #define MSG_USER_MENU                       _UxGT("Custom Commands")
 #endif

Marlin/src/lcd/menu/menu_bed_leveling.cpp

@@ -120,7 +120,7 @@
     // Encoder knob or keypad buttons adjust the Z position
     //
     if (encoderPosition) {
-      const float z = current_position[Z_AXIS] + float((int32_t)encoderPosition) * (MBL_Z_STEP);
+      const float z = current_position[Z_AXIS] + float((int32_t)encoderPosition) * (MESH_EDIT_Z_STEP);
       line_to_z(constrain(z, -(LCD_PROBE_Z_RANGE) * 0.5f, (LCD_PROBE_Z_RANGE) * 0.5f));
       lcdDrawUpdate = LCDVIEW_CALL_REDRAW_NEXT;
       encoderPosition = 0;
@@ -199,6 +199,25 @@
 
 #endif // PROBE_MANUALLY || MESH_BED_LEVELING
 
+#if ENABLED(MESH_EDIT_MENU)
+
+  inline void refresh_planner() {
+    set_current_from_steppers_for_axis(ALL_AXES);
+    sync_plan_position();
+  }
+
+  void menu_mbl_edit_mesh() {
+    static uint8_t xind, yind; // =0
+    START_MENU();
+    MENU_BACK(MSG_BED_LEVELING);
+    MENU_ITEM_EDIT(int8, MSG_MESH_X, &xind, 0, GRID_MAX_POINTS_X - 1);
+    MENU_ITEM_EDIT(int8, MSG_MESH_Y, &yind, 0, GRID_MAX_POINTS_Y - 1);
+    MENU_ITEM_EDIT_CALLBACK(float43, MSG_MESH_EDIT_Z, &Z_VALUES(xind, yind), -(LCD_PROBE_Z_RANGE) * 0.5, (LCD_PROBE_Z_RANGE) * 0.5, refresh_planner);
+    END_MENU();
+  }
+
+#endif // MESH_EDIT_MENU
+
 /**
  * Step 1: Bed Level entry-point
  *
@@ -233,6 +252,10 @@ void menu_bed_leveling() {
     MENU_ITEM(gcode, MSG_LEVEL_BED, is_homed ? PSTR("G29") : PSTR("G28\nG29"));
   #endif
 
+  #if ENABLED(MESH_EDIT_MENU)
+    MENU_ITEM(submenu, MSG_EDIT_MESH, menu_mbl_edit_mesh);
+  #endif
+
   // Homed and leveling is valid? Then leveling can be toggled.
   if (is_homed && leveling_is_valid()) {
     bool new_level_state = planner.leveling_active;
@@ -245,7 +268,7 @@ void menu_bed_leveling() {
   #endif
 
   //
-  // MBL Z Offset
+  // Mesh Bed Leveling Z-Offset
   //
   #if ENABLED(MESH_BED_LEVELING)
     MENU_ITEM_EDIT(float43, MSG_BED_Z, &mbl.z_offset, -1, 1);

buildroot/share/tests/megaatmega2560_tests

@@ -84,7 +84,7 @@ exec_test $1 $2 "RAMPS with Servo Probe, 3-Point ABL, DEBUG_LEVELING_FEATURE, EE
 # Test MESH_BED_LEVELING feature, with LCD
 #
 restore_configs
-opt_enable MESH_BED_LEVELING G26_MESH_EDITING MESH_G28_REST_ORIGIN LCD_BED_LEVELING ULTIMAKERCONTROLLER
+opt_enable MESH_BED_LEVELING G26_MESH_EDITING MESH_G28_REST_ORIGIN LCD_BED_LEVELING MESH_EDIT_MENU ULTIMAKERCONTROLLER
 exec_test $1 $2 "MESH_BED_LEVELING feature, with LCD"
 
 #
@@ -92,7 +92,7 @@ exec_test $1 $2 "MESH_BED_LEVELING feature, with LCD"
 #
 restore_configs
 opt_set MOTHERBOARD BOARD_MINIRAMBO
-opt_enable PROBE_MANUALLY AUTO_BED_LEVELING_BILINEAR G26_MESH_EDITING LCD_BED_LEVELING \
+opt_enable PROBE_MANUALLY AUTO_BED_LEVELING_BILINEAR G26_MESH_EDITING LCD_BED_LEVELING MESH_EDIT_MENU \
            EEPROM_SETTINGS EEPROM_CHITCHAT \
            M100_FREE_MEMORY_WATCHER M100_FREE_MEMORY_DUMPER M100_FREE_MEMORY_CORRUPTOR \
            INCH_MODE_SUPPORT TEMPERATURE_UNITS_SUPPORT \