G34 automatic point assignment (#16473)

Marlin/src/feature/z_stepper_align.h

@@ -0,0 +1,41 @@
+/**
+ * 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
+
+/**
+ * feature/z_stepper_align.h
+ */
+
+#include "../inc/MarlinConfig.h"
+
+class ZStepperAlign {
+  public:
+    static xy_pos_t xy[NUM_Z_STEPPER_DRIVERS];
+
+    #if ENABLED(Z_STEPPER_ALIGN_KNOWN_STEPPER_POSITIONS)
+      static xy_pos_t stepper_xy[NUM_Z_STEPPER_DRIVERS];
+    #endif
+
+  static void reset_to_default();
+};
+
+extern ZStepperAlign z_stepper_align;