Option to show babysteps total since G28 (#13580)

Marlin/src/feature/babystep.h

@@ -0,0 +1,63 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (C) 2019 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+#pragma once
+
+#include "../inc/MarlinConfigPre.h"
+#include "../core/enum.h"
+
+#if IS_CORE || EITHER(BABYSTEP_XY, I2C_POSITION_ENCODERS)
+  #define BS_TODO_AXIS(A) A
+#else
+  #define BS_TODO_AXIS(A) 0
+#endif
+
+#if HAS_LCD_MENU && ENABLED(BABYSTEP_DISPLAY_TOTAL)
+  #if ENABLED(BABYSTEP_XY)
+    #define BS_TOTAL_AXIS(A) A
+  #else
+    #define BS_TOTAL_AXIS(A) 0
+  #endif
+#endif
+
+class Babystep {
+public:
+  static volatile int16_t todo[BS_TODO_AXIS(Z_AXIS) + 1];
+  #if HAS_LCD_MENU
+    static int16_t accum;                                     // Total babysteps in current edit
+    #if ENABLED(BABYSTEP_DISPLAY_TOTAL)
+      static int16_t axis_total[BS_TOTAL_AXIS(Z_AXIS) + 1];   // Total babysteps since G28
+      static inline void reset_total(const AxisEnum axis) {
+        #if ENABLED(BABYSTEP_XY)
+          if (axis == Z_AXIS)
+        #endif
+            axis_total[BS_TOTAL_AXIS(axis)] = 0;
+      }
+    #endif
+  #endif
+  static void add_steps(const AxisEnum axis, const int32_t distance);
+  static void add_mm(const AxisEnum axis, const float &mm);
+  static void task();
+private:
+  static void step_axis(const AxisEnum axis);
+};
+
+extern Babystep babystep;