M808 Repeat Markers (#20084)

Marlin/src/feature/repeat.h

@@ -0,0 +1,49 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 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 <https://www.gnu.org/licenses/>.
+ *
+ */
+#pragma once
+
+#include "../inc/MarlinConfigPre.h"
+#include "../gcode/parser.h"
+
+#include <stdint.h>
+
+#define MAX_REPEAT_NESTING 10
+
+typedef struct {
+  uint32_t sdpos;   // The repeat file position
+  int16_t counter;  // The counter for looping
+} repeat_marker_t;
+
+class Repeat {
+private:
+  static repeat_marker_t marker[MAX_REPEAT_NESTING];
+  static uint8_t index;
+public:
+  static inline void reset() { index = 0; }
+  static bool is_command_M808(char * const cmd) { return cmd[0] == 'M' && cmd[1] == '8' && cmd[2] == '0' && cmd[3] == '8' && !NUMERIC(cmd[4]); }
+  static void early_parse_M808(char * const cmd);
+  static void add_marker(const uint32_t sdpos, const uint16_t count);
+  static void loop();
+  static void cancel();
+};
+
+extern Repeat repeat;