✨ DOGM Display Sleep (#23992)

Co-authored-by: borland1 <barryorlando@hotmail.com>

Marlin/src/gcode/lcd/M255.cpp

@@ -0,0 +1,58 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2022 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_GCODE_M255
+
+#include "../gcode.h"
+#include "../../lcd/marlinui.h"
+
+/**
+ * M255: Set the LCD sleep timeout (in minutes)
+ *  S<minutes> - Period of inactivity required for display / backlight sleep
+ */
+void GcodeSuite::M255() {
+  if (parser.seenval('S')) {
+    #if HAS_DISPLAY_SLEEP
+      const int m = parser.value_int();
+      ui.sleep_timeout_minutes = constrain(m, SLEEP_TIMEOUT_MIN, SLEEP_TIMEOUT_MAX);
+    #else
+      const int s = parser.value_int() * 60;
+      ui.lcd_backlight_timeout = constrain(s, LCD_BKL_TIMEOUT_MIN, LCD_BKL_TIMEOUT_MAX);
+    #endif
+  }
+  else
+    M255_report();
+}
+
+void GcodeSuite::M255_report(const bool forReplay/*=true*/) {
+  report_heading_etc(forReplay, F(STR_DISPLAY_SLEEP));
+  SERIAL_ECHOLNPGM("  M255 S",
+    #if HAS_DISPLAY_SLEEP
+      ui.sleep_timeout_minutes, " ; (minutes)"
+    #else
+      ui.lcd_backlight_timeout, " ; (seconds)"
+    #endif
+  );
+}
+
+#endif // HAS_GCODE_M255