Added experimental support for program flow control, mainly available for use in G65 macros stored on SD card or in littlefs.

ngc_flowctrl.h

@@ -0,0 +1,30 @@
+/*
+  ngc_flowctrl.h - An embedded CNC Controller with rs274/ngc (g-code) support
+
+  Program flow control, for filesystem macros
+
+  Part of grblHAL
+
+  Copyright (c) 2023 Terje Io
+
+  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 _NGC_FLOWCTRL_H_
+#define _NGC_FLOWCTRL_H_
+
+void ngc_flowctrl_init (void);
+status_code_t ngc_flowctrl (uint32_t o_label, char *line, uint_fast8_t *pos, bool *skip);
+
+#endif