grbl-LPC-CoreXY/config.h

/*
  config.h - compile time configuration
  Part of Grbl

  Copyright (c) 2009-2011 Simen Svale Skogsrud
  Copyright (c) 2011 Sungeun K. Jeon

  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 config_h
#define config_h

// IMPORTANT: Any changes here requires a full re-compiling of the source code to propagate them.

#define BAUD_RATE 9600

// Define pin-assignments
#define STEPPERS_DISABLE_DDR     DDRB
#define STEPPERS_DISABLE_PORT    PORTB
#define STEPPERS_DISABLE_BIT         0

#define STEPPING_DDR       DDRD
#define STEPPING_PORT      PORTD
#define X_STEP_BIT           2
#define Y_STEP_BIT           3
#define Z_STEP_BIT           4
#define X_DIRECTION_BIT      5
#define Y_DIRECTION_BIT      6
#define Z_DIRECTION_BIT      7

#define LIMIT_DDR      DDRB
#define LIMIT_PIN     PINB
#define X_LIMIT_BIT          1
#define Y_LIMIT_BIT          2
#define Z_LIMIT_BIT          3

#define SPINDLE_ENABLE_DDR DDRB
#define SPINDLE_ENABLE_PORT PORTB
#define SPINDLE_ENABLE_BIT 4

#define SPINDLE_DIRECTION_DDR DDRB
#define SPINDLE_DIRECTION_PORT PORTB
#define SPINDLE_DIRECTION_BIT 5

// Define runtime command special characters. These characters are 'picked-off' directly from the
// serial read data stream and are not passed to the grbl line execution parser. Select characters
// that do not and must not exist in the streamed g-code program. ASCII control characters may be 
// used, if they are available per user setup.
// TODO: Solidify these default characters. Temporary for now.
#define CMD_STATUS_REPORT '?'
#define CMD_FEED_HOLD '!'
#define CMD_CYCLE_START '~'
#define CMD_RESET 0x18 // ctrl-x

// This parameter sets the delay time before disabling the steppers after the final block of movement.
// A short delay ensures the steppers come to a complete stop and the residual inertial force in the 
// CNC axes don't cause the axes to drift off position. This is particularly important when manually 
// entering g-code into grbl, i.e. locating part zero or simple manual machining. If the axes drift,
// grbl has no way to know this has happened, since stepper motors are open-loop control. Depending
// on the machine, this parameter may need to be larger or smaller than the default time.
// NOTE: If defined 0, the delay will not be compiled.
#define STEPPER_IDLE_LOCK_TIME 25 // (milliseconds) - Integer >= 0

// The temporal resolution of the acceleration management subsystem. Higher number give smoother
// acceleration but may impact performance.
// NOTE: Increasing this parameter will help any resolution related issues, especially with machines 
// requiring very high accelerations and/or very fast feedrates. In general, this will reduce the 
// error between how the planner plans the motions and how the stepper program actually performs them.
// However, at some point, the resolution can be high enough, where the errors related to numerical 
// round-off can be great enough to cause problems and/or it's too fast for the Arduino. The correct
// value for this parameter is machine dependent, so it's advised to set this only as high as needed.
// Approximate successful values can range from 30L to 100L or more.
#define ACCELERATION_TICKS_PER_SECOND 50L

// Minimum planner junction speed. Sets the default minimum speed the planner plans for at the end
// of the buffer and all stops. This should not be much greater than zero and should only be changed
// if unwanted behavior is observed on a user's machine when running at very slow speeds.
#define MINIMUM_PLANNER_SPEED 0.0 // (mm/min)

// Minimum stepper rate. Sets the absolute minimum stepper rate in the stepper program and never runs
// slower than this value, except when sleeping. This parameter overrides the minimum planner speed.
// This is primarily used to guarantee that the end of a movement is always reached and not stop to
// never reach its target. This parameter should always be greater than zero.
#define MINIMUM_STEPS_PER_MINUTE 800 // (steps/min) - Integer value only

// Number of arc generation iterations by small angle approximation before exact arc trajectory 
// correction. This parameter maybe decreased if there are issues with the accuracy of the arc
// generations. In general, the default value is more than enough for the intended CNC applications
// of grbl, and should be on the order or greater than the size of the buffer to help with the 
// computational efficiency of generating arcs.
#define N_ARC_CORRECTION 25 // Integer (1-255)

// Time delay increments performed during a dwell. The default value is set at 50ms, which provides
// a maximum time delay of roughly 55 minutes, more than enough for most any application. Increasing
// this delay will increase the maximum dwell time linearly, but also reduces the responsiveness of 
// run-time command executions, like status reports, since these are performed between each dwell 
// time step. Also, keep in mind that the Arduino delay timer is not very accurate for long delays.
#define DWELL_TIME_STEP 50 // Integer (milliseconds)

#endif