homing_override: Add basic support for running custom g-code on G28

Allow users to override the behavior of G28 using a new
"homing_override" config section.  This may be used on printers that
require specific steps during the homing process.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2018-01-22 12:33:25 -05:00
parent 39d62556b1
commit 3001a089c0
2 changed files with 41 additions and 0 deletions

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@ -267,6 +267,19 @@
# default is to not scale the 'channel_x' parameters. # default is to not scale the 'channel_x' parameters.
# Homing override. One may use this mechanism to run a series of
# g-code commands in place of a G28 found in the normal g-code input.
# This may be useful on printers that require a specific procedure to
# home the machine.
#[homing_override]
#gcode:
# A list of G-Code commands (one per line) to execute in place of
# all G28 commands found in the normal g-code input. If a G28 is
# contained in this list of commands then it will invoke the normal
# homing procedure for the printer. The commands listed here must
# home all axes. This parameter must be provided.
# Replicape support - see the generic-replicape.cfg file for further # Replicape support - see the generic-replicape.cfg file for further
# details. # details.
#[replicape] #[replicape]

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@ -0,0 +1,28 @@
# Run user defined actions in place of a normal G28 homing command
#
# Copyright (C) 2018 Kevin O'Connor <kevin@koconnor.net>
#
# This file may be distributed under the terms of the GNU GPLv3 license.
class HomingOverride:
def __init__(self, config):
printer = config.get_printer()
self.script = config.get('gcode')
self.in_script = False
self.gcode = printer.lookup_object('gcode')
self.gcode.register_command("G28", self.cmd_G28)
def cmd_G28(self, params):
if self.in_script:
# Was called recursively - invoke the real G28 command
self.gcode.cmd_G28(params)
return
try:
self.in_script = True
self.gcode.run_script(self.script)
finally:
self.in_script = False
def load_config(config):
if config.get_name() != 'homing_override':
raise config.error("Invalid homing_override config name")
return HomingOverride(config)