Added $RTC system command for outputting or setting current real time clock date and time. Uses ISO8601 format.

Driver developers: check the changelog!

machine_limits.h

@@ -0,0 +1,46 @@
+/*
+  machine_limits.h - code pertaining to limit-switches and performing the homing cycle
+
+  Part of grblHAL
+
+  Copyright (c) 2017-2022 Terje Io
+  Copyright (c) 2012-2015 Sungeun K. Jeon
+  Copyright (c) 2009-2011 Simen Svale Skogsrud
+
+  Grbl 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.
+
+  Grbl 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 Grbl.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef _MACHINE_LIMITS_H_
+#define _MACHINE_LIMITS_H_
+
+#include "nuts_bolts.h"
+
+// Perform one portion of the homing cycle based on the input settings.
+bool limits_go_home(axes_signals_t cycle);
+
+// Check for soft limit violations
+void limits_soft_check(float *target);
+
+// Check if homing is required.
+bool limits_homing_required (void);
+
+// Set axes to be homed from settings.
+void limits_set_homing_axes (void);
+void limits_set_machine_positions (axes_signals_t cycle, bool add_pulloff);
+
+void limit_interrupt_handler (limit_signals_t state);
+
+axes_signals_t limit_signals_merge (limit_signals_t signals);
+
+#endif