Starting with Stock BTT-Config and Old Configs as Backup

Marlin/src/gcode/feature/runout/M412.cpp

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+/**
+ * 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/>.
+ *
+ */
+
+#include "../../../inc/MarlinConfig.h"
+
+#if HAS_FILAMENT_SENSOR
+
+#include "../../gcode.h"
+#include "../../../feature/runout.h"
+
+/**
+ * M412: Enable / Disable filament runout detection
+ *
+ * Parameters
+ *  R         : Reset the runout sensor
+ *  S<bool>   : Reset and enable/disable the runout sensor
+ *  H<bool>   : Enable/disable host handling of filament runout
+ *  D<linear> : Extra distance to continue after runout is triggered
+ */
+void GcodeSuite::M412() {
+  if (parser.seen("RS"
+    TERN_(HAS_FILAMENT_RUNOUT_DISTANCE, "D")
+    TERN_(HOST_ACTION_COMMANDS, "H")
+  )) {
+    #if ENABLED(HOST_ACTION_COMMANDS)
+      if (parser.seen('H')) runout.host_handling = parser.value_bool();
+    #endif
+    const bool seenR = parser.seen_test('R'), seenS = parser.seen('S');
+    if (seenR || seenS) runout.reset();
+    if (seenS) runout.enabled = parser.value_bool();
+    #if HAS_FILAMENT_RUNOUT_DISTANCE
+      if (parser.seen('D')) runout.set_runout_distance(parser.value_linear_units());
+    #endif
+  }
+  else {
+    SERIAL_ECHO_START();
+    SERIAL_ECHOPGM("Filament runout ");
+    serialprint_onoff(runout.enabled);
+    #if HAS_FILAMENT_RUNOUT_DISTANCE
+      SERIAL_ECHOPAIR(" ; Distance ", runout.runout_distance(), "mm");
+    #endif
+    #if ENABLED(HOST_ACTION_COMMANDS)
+      SERIAL_ECHOPGM(" ; Host handling ");
+      serialprint_onoff(runout.host_handling);
+    #endif
+    SERIAL_EOL();
+  }
+}
+
+#endif // HAS_FILAMENT_SENSOR