GRBL Homing not enabled

Using Arduino Motors, Mechanics, Power and CNC
1

I am new to CNC and GRBL.
So I downloaded GRBL from github and placed it in a UNO.
All commands are working exept $H, these are my homing settings:

00:06:32.343 -> $22=0 (homing cycle, bool)
00:06:32.343 -> $23=0 (homing dir invert mask:00000000)
00:06:32.343 -> $24=25.000 (homing feed, mm/min)
00:06:32.375 -> $25=500.000 (homing seek, mm/min)
00:06:32.375 -> $26=250 (homing debounce, msec)
00:06:32.375 -> $27=1.000 (homing pull-off, mm)

and when I send a $H command I get
00:10:05.719 -> error: Setting disabled
sio changed $22 = 1 and now $H works
But after a$RST $22 is returned to 0 value.

What must I do to get $H working when I compile the firmware??

2

try

$22=1
$H
3

As I wrote done that but after a $RST $22=0 and $H doesnt work anymore.
So it must be a setting in config.h

4

why you restore settings to default?

5

So if I do something wrong I could restore to default and try again.
Experimenting with settings can sometimes cause havoc

6

grbl/grbl/defaults/defaults_generic.h

/*
  defaults_generic.h - defaults settings configuration file
  Part of Grbl

  Copyright (c) 2012-2015 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/>.
*/

/* The defaults.h file serves as a central default settings file for different machine
   types, from DIY CNC mills to CNC conversions of off-the-shelf machines. The settings
   here are supplied by users, so your results may vary. However, this should give you
   a good starting point as you get to know your machine and tweak the settings for your
   nefarious needs. */

#ifndef defaults_h
#define defaults_h

  // Grbl generic default settings. Should work across different machines.
  #define DEFAULT_X_STEPS_PER_MM 250.0
  #define DEFAULT_Y_STEPS_PER_MM 250.0
  #define DEFAULT_Z_STEPS_PER_MM 250.0
  #define DEFAULT_X_MAX_RATE 500.0 // mm/min
  #define DEFAULT_Y_MAX_RATE 500.0 // mm/min
  #define DEFAULT_Z_MAX_RATE 500.0 // mm/min
  #define DEFAULT_X_ACCELERATION (10.0*60*60) // 10*60*60 mm/min^2 = 10 mm/sec^2
  #define DEFAULT_Y_ACCELERATION (10.0*60*60) // 10*60*60 mm/min^2 = 10 mm/sec^2
  #define DEFAULT_Z_ACCELERATION (10.0*60*60) // 10*60*60 mm/min^2 = 10 mm/sec^2
  #define DEFAULT_X_MAX_TRAVEL 200.0 // mm
  #define DEFAULT_Y_MAX_TRAVEL 200.0 // mm
  #define DEFAULT_Z_MAX_TRAVEL 200.0 // mm
  #define DEFAULT_STEP_PULSE_MICROSECONDS 10
  #define DEFAULT_STEPPING_INVERT_MASK 0
  #define DEFAULT_DIRECTION_INVERT_MASK 0
  #define DEFAULT_STEPPER_IDLE_LOCK_TIME 25 // msec (0-254, 255 keeps steppers enabled)
  #define DEFAULT_STATUS_REPORT_MASK ((BITFLAG_RT_STATUS_MACHINE_POSITION)|(BITFLAG_RT_STATUS_WORK_POSITION))
  #define DEFAULT_JUNCTION_DEVIATION 0.01 // mm
  #define DEFAULT_ARC_TOLERANCE 0.002 // mm
  #define DEFAULT_REPORT_INCHES 0 // false
  #define DEFAULT_INVERT_ST_ENABLE 0 // false
  #define DEFAULT_INVERT_LIMIT_PINS 0 // false
  #define DEFAULT_SOFT_LIMIT_ENABLE 0 // false
  #define DEFAULT_HARD_LIMIT_ENABLE 0  // false
  #define DEFAULT_HOMING_ENABLE 0  // false <<<< -------------------------------------------------------------------------  <<<<< <---------<-<-<-<-<--<
  #define DEFAULT_HOMING_DIR_MASK 0 // move positive dir
  #define DEFAULT_HOMING_FEED_RATE 25.0 // mm/min
  #define DEFAULT_HOMING_SEEK_RATE 500.0 // mm/min
  #define DEFAULT_HOMING_DEBOUNCE_DELAY 250 // msec (0-65k)
  #define DEFAULT_HOMING_PULLOFF 1.0 // mm

#endif
7

or just use this sketch (without need to altering the grbl files):


#define defaults_h

#define DEFAULT_X_STEPS_PER_MM 250.0
#define DEFAULT_Y_STEPS_PER_MM 250.0
#define DEFAULT_Z_STEPS_PER_MM 250.0
#define DEFAULT_X_MAX_RATE 500.0 // mm/min
#define DEFAULT_Y_MAX_RATE 500.0 // mm/min
#define DEFAULT_Z_MAX_RATE 500.0 // mm/min
#define DEFAULT_X_ACCELERATION (10.0*60*60) // 10*60*60 mm/min^2 = 10 mm/sec^2
#define DEFAULT_Y_ACCELERATION (10.0*60*60) // 10*60*60 mm/min^2 = 10 mm/sec^2
#define DEFAULT_Z_ACCELERATION (10.0*60*60) // 10*60*60 mm/min^2 = 10 mm/sec^2
#define DEFAULT_X_MAX_TRAVEL 200.0 // mm
#define DEFAULT_Y_MAX_TRAVEL 200.0 // mm
#define DEFAULT_Z_MAX_TRAVEL 200.0 // mm
#define DEFAULT_STEP_PULSE_MICROSECONDS 10
#define DEFAULT_STEPPING_INVERT_MASK 0
#define DEFAULT_DIRECTION_INVERT_MASK 0
#define DEFAULT_STEPPER_IDLE_LOCK_TIME 25 // msec (0-254, 255 keeps steppers enabled)
#define DEFAULT_STATUS_REPORT_MASK ((BITFLAG_RT_STATUS_MACHINE_POSITION)|(BITFLAG_RT_STATUS_WORK_POSITION))
#define DEFAULT_JUNCTION_DEVIATION 0.01 // mm
#define DEFAULT_ARC_TOLERANCE 0.002 // mm
#define DEFAULT_REPORT_INCHES 0 // false
#define DEFAULT_INVERT_ST_ENABLE 0 // false
#define DEFAULT_INVERT_LIMIT_PINS 0 // false
#define DEFAULT_SOFT_LIMIT_ENABLE 0 // false
#define DEFAULT_HARD_LIMIT_ENABLE 0  // false
#define DEFAULT_HOMING_ENABLE 0  // false <<<< -------------------------------------------------------------------------  <<<<< <---------<-<-<-<-<--<
#define DEFAULT_HOMING_DIR_MASK 0 // move positive dir
#define DEFAULT_HOMING_FEED_RATE 25.0 // mm/min
#define DEFAULT_HOMING_SEEK_RATE 500.0 // mm/min
#define DEFAULT_HOMING_DEBOUNCE_DELAY 250 // msec (0-65k)
#define DEFAULT_HOMING_PULLOFF 1.0 // mm


#include <grbl.h>