192 lines
8.2 KiB
Python
192 lines
8.2 KiB
Python
# Endstop accuracy improvement via stepper phase tracking
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#
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# Copyright (C) 2016-2018 Kevin O'Connor <kevin@koconnor.net>
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#
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# This file may be distributed under the terms of the GNU GPLv3 license.
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import math, logging
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import homing
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TRINAMIC_DRIVERS = ["tmc2130", "tmc2208", "tmc2660"]
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class EndstopPhase:
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def __init__(self, config):
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self.printer = config.get_printer()
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self.name = config.get_name().split()[1]
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# Determine number of stepper phases
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for driver in TRINAMIC_DRIVERS:
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driver_name = "%s %s" % (driver, self.name)
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if config.has_section(driver_name):
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module = self.printer.try_load_module(config, driver_name)
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self.get_phase = module.get_phase
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self.phases = module.get_microsteps() * 4
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break
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else:
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self.get_phase = None
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self.phases = config.getint('phases', minval=1)
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# Determine endstop phase position
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self.endstop_phase = config.getint('endstop_phase', None,
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minval=0, maxval=self.phases-1)
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self.endstop_align_zero = config.getboolean('endstop_align_zero', False)
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# Determine endstop accuracy
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stepper_config = config.getsection(self.name)
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self.step_dist = step_dist = stepper_config.getfloat('step_distance')
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endstop_accuracy = config.getfloat('endstop_accuracy', None, above=0.)
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if endstop_accuracy is None:
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self.endstop_accuracy = self.phases//2 - 1
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elif self.endstop_phase is not None:
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self.endstop_accuracy = int(
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math.ceil(endstop_accuracy * .5 / step_dist))
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else:
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self.endstop_accuracy = int(math.ceil(endstop_accuracy / step_dist))
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if self.endstop_accuracy >= self.phases // 2:
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raise config.error("Endstop for %s is not accurate enough for"
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" stepper phase adjustment" % (self.name,))
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if self.printer.get_start_args().get('debugoutput') is not None:
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self.endstop_accuracy = self.phases
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self.phase_history = [0] * self.phases
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# Register event handler
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self.printer.register_event_handler(
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"homing:homed_rails", self.handle_homed_rails)
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self.printer.try_load_module(config, "endstop_phase")
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def align_endstop(self, pos):
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if not self.endstop_align_zero or self.endstop_phase is None:
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return pos
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# Adjust the endstop position so 0.0 is always at a full step
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microsteps = self.phases // 4
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half_microsteps = microsteps // 2
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phase_offset = (((self.endstop_phase + half_microsteps) % microsteps)
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- half_microsteps) * self.step_dist
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full_step = microsteps * self.step_dist
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return int(pos / full_step + .5) * full_step + phase_offset
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def get_homed_offset(self, stepper):
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if self.get_phase is not None:
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try:
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phase = self.get_phase()
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except Exception as e:
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msg = "Unable to get stepper %s phase: %s" % (self.name, str(e))
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logging.exception(msg)
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raise homing.EndstopError(msg)
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else:
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phase = stepper.get_mcu_position() % self.phases
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self.phase_history[phase] += 1
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if self.endstop_phase is None:
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logging.info("Setting %s endstop phase to %d", self.name, phase)
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self.endstop_phase = phase
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return 0.
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delta = (phase - self.endstop_phase) % self.phases
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if delta >= self.phases - self.endstop_accuracy:
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delta -= self.phases
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elif delta > self.endstop_accuracy:
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raise homing.EndstopError(
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"Endstop %s incorrect phase (got %d vs %d)" % (
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self.name, phase, self.endstop_phase))
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return delta * self.step_dist
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def handle_homed_rails(self, homing_state, rails):
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for rail in rails:
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stepper = rail.get_steppers()[0]
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if stepper.get_name() != self.name:
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continue
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orig_pos = rail.get_commanded_position()
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offset = self.get_homed_offset(stepper)
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pos = self.align_endstop(orig_pos) + offset
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if pos == orig_pos:
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return False
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rail.set_commanded_position(pos)
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return True
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class EndstopPhases:
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def __init__(self, config):
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self.printer = config.get_printer()
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self.gcode = self.printer.lookup_object('gcode')
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self.gcode.register_command("ENDSTOP_PHASE_CALIBRATE",
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self.cmd_ENDSTOP_PHASE_CALIBRATE,
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desc=self.cmd_ENDSTOP_PHASE_CALIBRATE_help)
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self.tracking = {}
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# Register event handler
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self.printer.register_event_handler(
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"homing:homed_rails", self.handle_homed_rails)
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def lookup_rail(self, stepper, stepper_name):
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mod_name = "endstop_phase %s" % (stepper_name,)
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m = self.printer.lookup_object(mod_name, None)
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if m is not None:
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return (None, m.phase_history)
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for driver in TRINAMIC_DRIVERS:
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mod_name = "%s %s" % (driver, stepper_name)
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m = self.printer.lookup_object(mod_name, None)
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if m is not None:
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return (m.get_phase, [0] * (m.get_microsteps() * 4))
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return None
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def update_rail(self, info, stepper):
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if info is None:
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return
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get_phase, phase_history = info
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if get_phase is None:
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return
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try:
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phase = get_phase()
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except:
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logging.exception("Error in EndstopPhases get_phase")
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return
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phase_history[phase] += 1
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def handle_homed_rails(self, homing_state, rails):
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for rail in rails:
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stepper = rail.get_steppers()[0]
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stepper_name = stepper.get_name()
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if stepper_name not in self.tracking:
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info = self.lookup_rail(stepper, stepper_name)
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self.tracking[stepper_name] = info
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self.update_rail(self.tracking[stepper_name], stepper)
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cmd_ENDSTOP_PHASE_CALIBRATE_help = "Calibrate stepper phase"
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def cmd_ENDSTOP_PHASE_CALIBRATE(self, params):
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stepper_name = self.gcode.get_str('STEPPER', params, None)
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if stepper_name is None:
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self.report_stats()
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return
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info = self.tracking.get(stepper_name)
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if info is None:
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raise self.gcode.error("Stats not available for stepper %s" % (
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stepper_name,))
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endstop_phase = self.generate_stats(stepper_name, info)
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configfile = self.printer.lookup_object('configfile')
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section = 'endstop_phase %s' % stepper_name
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configfile.remove_section(section)
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configfile.set(section, "endstop_phase", endstop_phase)
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self.gcode.respond_info(
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"The SAVE_CONFIG command will update the printer config\n"
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"file with these parameters and restart the printer.")
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def generate_stats(self, stepper_name, info):
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get_phase, phase_history = info
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wph = phase_history + phase_history
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count = sum(phase_history)
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phases = len(phase_history)
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half_phases = phases // 2
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res = []
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for i in range(phases):
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phase = i + half_phases
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cost = sum([wph[j] * abs(j-phase) for j in range(i, i+phases)])
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res.append((cost, phase))
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res.sort()
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best = res[0][1]
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found = [j for j in range(best - half_phases, best + half_phases)
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if wph[j]]
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best_phase = best % phases
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lo, hi = found[0] % phases, found[-1] % phases
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self.gcode.respond_info("%s: endstop_phase=%d (range %d to %d)" % (
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stepper_name, best_phase, lo, hi))
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return best_phase
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def report_stats(self):
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if not self.tracking:
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self.gcode.respond_info(
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"No steppers found. (Be sure to home at least once.)")
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return
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for stepper_name, info in sorted(self.tracking.items()):
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if info is None:
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continue
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self.generate_stats(stepper_name, info)
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def load_config_prefix(config):
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return EndstopPhase(config)
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def load_config(config):
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return EndstopPhases(config)
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