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# 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):
self.printer = config.get_printer()
self.start_pos = [config.getfloat("set_position_" + a, None) for a in "xyz"]
self.axes = config.get("axes", "XYZ").upper()
gcode_macro = self.printer.load_object(config, "gcode_macro")
self.template = gcode_macro.load_template(config, "gcode")
self.in_script = False
self.printer.load_object(config, "homing")
self.gcode = self.printer.lookup_object("gcode")
self.prev_G28 = self.gcode.register_command("G28", None)
self.gcode.register_command("G28", self.cmd_G28)
def cmd_G28(self, gcmd):
if self.in_script:
# Was called recursively - invoke the real G28 command
self.prev_G28(gcmd)
return
# if no axis is given as parameter we assume the override
no_axis = True
for axis in "XYZ":
if gcmd.get(axis, None) is not None:
no_axis = False
break
if no_axis:
override = True
else:
# check if we home an axis which needs the override
override = False
for axis in self.axes:
if gcmd.get(axis, None) is not None:
override = True
if not override:
self.prev_G28(gcmd)
return
# Calculate forced position (if configured)
toolhead = self.printer.lookup_object("toolhead")
pos = toolhead.get_position()
homing_axes = ""
for axis, loc in enumerate(self.start_pos):
if loc is not None:
pos[axis] = loc
homing_axes += "xyz"[axis]
toolhead.set_position(pos, homing_axes=homing_axes)
# Perform homing
context = self.template.create_template_context()
context["params"] = gcmd.get_command_parameters()
context["rawparams"] = gcmd.get_raw_command_parameters()
try:
self.in_script = True
self.template.run_gcode_from_command(context)
finally:
self.in_script = False
def load_config(config):
return HomingOverride(config)
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