relaunch ontop of latest grbl edge

code very messy but tested

sim/simulator.h

@@ -0,0 +1,60 @@
+/*
+  simulator.h - functions to simulate how the buffer is emptied and the
+    stepper interrupt is called
+
+  Part of Grbl Simulator
+
+  Copyright (c) 2012 Jens Geisler
+
+  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 simulator_h
+#define simulator_h
+
+#include <stdio.h>
+#include "../nuts_bolts.h"
+
+// Output file handles
+extern FILE *block_out_file;
+extern FILE *step_out_file;
+
+// This variable is needed to determine if execute_runtime() is called in a loop
+// waiting for the buffer to empty, as in plan_synchronize()
+extern int runtime_second_call;
+
+// Minimum time step for printing stepper values. Given by user via command line
+extern double step_time;
+
+// global system variable structure for position etc.
+extern system_t sys;
+extern uint8_t print_comment;
+
+
+// Call the stepper interrupt until one block is finished
+void sim_stepper();
+
+// Check if buffer is full or if plan_synchronize() wants to clear the buffer
+void handle_buffer();
+
+// Print information about the most recently inserted block
+void printBlock();
+
+// Calculate the time between stepper interrupt calls from TCCR1B and OCR1A AVR registers
+// which are set in config_step_timer in stepper.c
+// This reconstructs the stepper-internal value of variable st.cycles_per_step_event
+// The reconstruction is done to truely decouple the simulator from the actual grbl code
+double get_step_time();
+
+#endif