homing_heaters: Turn off heaters during homing/probing (#2486)

Signed-off-by: Mike Stiemke <fandjango@gmx.de>

klippy/extras/homing_heaters.py

@@ -0,0 +1,70 @@
+# Heater handling on homing moves
+#
+# Copyright (C) 2016-2018  Kevin O'Connor <kevin@koconnor.net>
+#
+# This file may be distributed under the terms of the GNU GPLv3 license.
+
+import logging
+
+class HomingHeaters:
+    def __init__(self, config):
+        self.printer = config.get_printer()
+        self.printer.register_event_handler("klippy:connect",
+                                            self.handle_connect)
+        self.printer.register_event_handler("homing:move_begin",
+                                            self.handle_homing_move_begin)
+        self.printer.register_event_handler("homing:move_end",
+                                            self.handle_homing_move_end)
+        self.heaters_to_disable = config.get("heaters", "")
+        self.disable_heaters = []
+        self.steppers_needing_quiet = config.get("steppers", "")
+        self.flaky_steppers = []
+        self.pheater = self.printer.lookup_object('heater')
+        self.target_save = {}
+
+    def handle_connect(self):
+        # heaters to disable
+        all_heaters = self.pheater.get_all_heaters()
+        self.disable_heaters = [n.strip()
+                          for n in self.heaters_to_disable.split(',')]
+        if self.disable_heaters == [""]:
+            self.disable_heaters = all_heaters
+        else:
+            if not all(x in all_heaters for x in self.disable_heaters):
+                raise self.printer.config_error(
+                    "One or more of these heaters are unknown: %s" % (
+                        self.disable_heaters))
+        # steppers valid?
+        kin = self.printer.lookup_object('toolhead').get_kinematics()
+        all_steppers = [s.get_name() for s in kin.get_steppers()]
+        self.flaky_steppers = [n.strip()
+                         for n in self.steppers_needing_quiet.split(',')]
+        if self.flaky_steppers == [""]:
+            return
+        if not all(x in all_steppers for x in self.flaky_steppers):
+            raise self.printer.config_error(
+                "One or more of these steppers are unknown: %s" % (
+                    self.flaky_steppers))
+    def check_eligible(self, endstops):
+        if self.flaky_steppers == [""]:
+            return True
+        steppers_being_homed = [s.get_name()
+                                for es, name in endstops
+                                for s in es.get_steppers()]
+        return any(x in self.flaky_steppers for x in steppers_being_homed)
+    def handle_homing_move_begin(self, endstops):
+        if not self.check_eligible(endstops):
+            return
+        for heater_name in self.disable_heaters:
+            heater = self.pheater.lookup_heater(heater_name)
+            self.target_save[heater_name] = heater.get_temp(0)[1]
+            heater.set_temp(0.)
+    def handle_homing_move_end(self, endstops):
+        if not self.check_eligible(endstops):
+            return
+        for heater_name in self.disable_heaters:
+            heater = self.pheater.lookup_heater(heater_name)
+            heater.set_temp(self.target_save[heater_name])
+
+def load_config(config):
+    return HomingHeaters(config)