/*
  stepper.h - stepper motor driver: executes motion plans of planner.c using the stepper motors
  Part of Grbl

  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 stepper_h
#define stepper_h 

#include "planner.h"

// Initialize and start the stepper motor subsystem
void st_init();

// Block until all buffered steps are executed
void st_synchronize();

// The stepper subsystem goes to sleep when it runs out of things to execute. Call this
// to notify the subsystem that it is time to go to work.
void st_wake_up();

// if DEBUG_STEPS is enabled, M114 can be used to compare two methods of determining the X,Y,Z position of the printer.
// for debugging purposes only, should be disabled by default
#ifdef DEBUG_STEPS
  extern volatile long count_position[NUM_AXIS];
  extern volatile int count_direction[NUM_AXIS];
#endif

extern block_t *current_block;  // A pointer to the block currently being traced
#endif