# Multi-processor safe interface to micro-controller # # Copyright (C) 2016 Kevin O'Connor # # This file may be distributed under the terms of the GNU GPLv3 license. import sys, zlib, logging, time, math import serialhdl, pins, chelper class error(Exception): pass def parse_pin_extras(pin, can_pullup=False): pullup = invert = 0 if can_pullup and pin.startswith('^'): pullup = 1 pin = pin[1:].strip() if pin.startswith('!'): invert = 1 pin = pin[1:].strip() return pin, pullup, invert class MCU_stepper: def __init__(self, mcu, step_pin, dir_pin, min_stop_interval, max_error): self._mcu = mcu self._oid = mcu.create_oid() step_pin, pullup, invert_step = parse_pin_extras(step_pin) dir_pin, pullup, self._invert_dir = parse_pin_extras(dir_pin) self._mcu_freq = mcu.get_mcu_freq() min_stop_interval = int(min_stop_interval * self._mcu_freq) max_error = int(max_error * self._mcu_freq) self.commanded_position = 0 self._mcu_position_offset = 0 mcu.add_config_cmd( "config_stepper oid=%d step_pin=%s dir_pin=%s" " min_stop_interval=%d invert_step=%d" % ( self._oid, step_pin, dir_pin, min_stop_interval, invert_step)) mcu.register_stepper(self) self._step_cmd = mcu.lookup_command( "queue_step oid=%c interval=%u count=%hu add=%hi") self._dir_cmd = mcu.lookup_command( "set_next_step_dir oid=%c dir=%c") self._reset_cmd = mcu.lookup_command( "reset_step_clock oid=%c clock=%u") ffi_main, self.ffi_lib = chelper.get_ffi() self._stepqueue = ffi_main.gc(self.ffi_lib.stepcompress_alloc( max_error, self._step_cmd.msgid , self._dir_cmd.msgid, self._invert_dir, self._oid), self.ffi_lib.stepcompress_free) self.print_to_mcu_time = mcu.print_to_mcu_time def get_oid(self): return self._oid def get_invert_dir(self): return self._invert_dir def set_position(self, pos): self._mcu_position_offset += self.commanded_position - pos self.commanded_position = pos def set_mcu_position(self, pos): self._mcu_position_offset = pos - self.commanded_position def get_mcu_position(self): return self.commanded_position + self._mcu_position_offset def note_stepper_stop(self): self.ffi_lib.stepcompress_reset(self._stepqueue, 0) def reset_step_clock(self, mcu_time): clock = int(mcu_time * self._mcu_freq) self.ffi_lib.stepcompress_reset(self._stepqueue, clock) data = (self._reset_cmd.msgid, self._oid, clock & 0xffffffff) self.ffi_lib.stepcompress_queue_msg(self._stepqueue, data, len(data)) def step(self, mcu_time, sdir): clock = mcu_time * self._mcu_freq self.ffi_lib.stepcompress_push(self._stepqueue, clock, sdir) if sdir: self.commanded_position += 1 else: self.commanded_position -= 1 def step_sqrt(self, mcu_time, steps, step_offset, sqrt_offset, factor): clock = mcu_time * self._mcu_freq mcu_freq2 = self._mcu_freq**2 count = self.ffi_lib.stepcompress_push_sqrt( self._stepqueue, steps, step_offset, clock , sqrt_offset * mcu_freq2, factor * mcu_freq2) self.commanded_position += count return count def step_factor(self, mcu_time, steps, step_offset, factor): clock = mcu_time * self._mcu_freq count = self.ffi_lib.stepcompress_push_factor( self._stepqueue, steps, step_offset, clock, factor * self._mcu_freq) self.commanded_position += count return count def step_delta_const(self, mcu_time, dist, step_dist, start_pos , closest_height2, height, movez_r, inv_velocity): clock = mcu_time * self._mcu_freq count = self.ffi_lib.stepcompress_push_delta_const( self._stepqueue, clock, dist, step_dist, start_pos , closest_height2, height, movez_r, inv_velocity * self._mcu_freq) self.commanded_position += count return count def step_delta_accel(self, mcu_time, dist, step_dist, start_pos , closest_height2, height, movez_r, accel_multiplier): clock = mcu_time * self._mcu_freq mcu_freq2 = self._mcu_freq**2 count = self.ffi_lib.stepcompress_push_delta_accel( self._stepqueue, clock, dist, step_dist, start_pos , closest_height2, height, movez_r, accel_multiplier * mcu_freq2) self.commanded_position += count return count def get_errors(self): return self.ffi_lib.stepcompress_get_errors(self._stepqueue) class MCU_endstop: RETRY_QUERY = 1.000 def __init__(self, mcu, pin, stepper): self._mcu = mcu self._oid = mcu.create_oid() self._stepper = stepper stepper_oid = stepper.get_oid() pin, pullup, self._invert = parse_pin_extras(pin, can_pullup=True) self._cmd_queue = mcu.alloc_command_queue() mcu.add_config_cmd( "config_end_stop oid=%d pin=%s pull_up=%d stepper_oid=%d" % ( self._oid, pin, pullup, stepper_oid)) self._home_cmd = mcu.lookup_command( "end_stop_home oid=%c clock=%u rest_ticks=%u pin_value=%c") mcu.register_msg(self._handle_end_stop_state, "end_stop_state" , self._oid) self._query_cmd = mcu.lookup_command("end_stop_query oid=%c") self._homing = False self._min_query_time = 0. self._next_query_clock = self._home_timeout_clock = 0 self._mcu_freq = mcu.get_mcu_freq() self._retry_query_ticks = int(self._mcu_freq * self.RETRY_QUERY) self._last_state = {} self.print_to_mcu_time = mcu.print_to_mcu_time def home(self, mcu_time, rest_time): clock = int(mcu_time * self._mcu_freq) rest_ticks = int(rest_time * self._mcu_freq) self._homing = True self._min_query_time = time.time() self._next_query_clock = clock + self._retry_query_ticks msg = self._home_cmd.encode( self._oid, clock, rest_ticks, 1 ^ self._invert) self._mcu.send(msg, reqclock=clock, cq=self._cmd_queue) def home_finalize(self, mcu_time): # XXX - this flushes the serial port of messages ready to be # sent, but doesn't flush messages if they had an unmet minclock self._mcu.serial.send_flush() self._stepper.note_stepper_stop() self._home_timeout_clock = int(mcu_time * self._mcu_freq) def _handle_end_stop_state(self, params): logging.debug("end_stop_state %s" % (params,)) self._last_state = params def check_busy(self, eventtime): # Check if need to send an end_stop_query command if self._mcu.is_fileoutput(): return False last_sent_time = self._last_state.get('#sent_time', -1.) if last_sent_time >= self._min_query_time: if not self._homing: return False if not self._last_state.get('homing', 0): self._stepper.set_mcu_position(self.get_last_position()) self._homing = False return False if (self._mcu.serial.get_clock(last_sent_time) > self._home_timeout_clock): # Timeout - disable endstop checking msg = self._home_cmd.encode(self._oid, 0, 0, 0) self._mcu.send(msg, reqclock=0, cq=self._cmd_queue) raise error("Timeout during endstop homing") if self._mcu.is_shutdown: raise error("MCU is shutdown") last_clock = self._mcu.get_last_clock() if last_clock >= self._next_query_clock: self._next_query_clock = last_clock + self._retry_query_ticks msg = self._query_cmd.encode(self._oid) self._mcu.send(msg, cq=self._cmd_queue) return True def get_last_position(self): pos = self._last_state.get('pos', 0) if self._stepper.get_invert_dir(): return -pos return pos def query_endstop(self, mcu_time): clock = int(mcu_time * self._mcu_freq) self._homing = False self._min_query_time = time.time() self._next_query_clock = clock def get_last_triggered(self): return self._last_state.get('pin', self._invert) ^ self._invert class MCU_digital_out: def __init__(self, mcu, pin, max_duration): self._mcu = mcu self._oid = mcu.create_oid() pin, pullup, self._invert = parse_pin_extras(pin) self._last_clock = 0 self._last_value = None self._mcu_freq = mcu.get_mcu_freq() self._cmd_queue = mcu.alloc_command_queue() mcu.add_config_cmd( "config_digital_out oid=%d pin=%s default_value=%d" " max_duration=%d" % (self._oid, pin, self._invert, max_duration)) self._set_cmd = mcu.lookup_command( "schedule_digital_out oid=%c clock=%u value=%c") self.print_to_mcu_time = mcu.print_to_mcu_time def set_digital(self, mcu_time, value): clock = int(mcu_time * self._mcu_freq) msg = self._set_cmd.encode(self._oid, clock, value ^ self._invert) self._mcu.send(msg, minclock=self._last_clock, reqclock=clock , cq=self._cmd_queue) self._last_clock = clock self._last_value = value def get_last_setting(self): return self._last_value def set_pwm(self, mcu_time, value): dval = 0 if value > 127: dval = 1 self.set_digital(mcu_time, dval) class MCU_pwm: def __init__(self, mcu, pin, cycle_ticks, max_duration, hard_pwm=True): self._mcu = mcu self._oid = mcu.create_oid() self._last_clock = 0 self._mcu_freq = mcu.get_mcu_freq() self._cmd_queue = mcu.alloc_command_queue() if hard_pwm: mcu.add_config_cmd( "config_pwm_out oid=%d pin=%s cycle_ticks=%d default_value=0" " max_duration=%d" % (self._oid, pin, cycle_ticks, max_duration)) self._set_cmd = mcu.lookup_command( "schedule_pwm_out oid=%c clock=%u value=%c") else: mcu.add_config_cmd( "config_soft_pwm_out oid=%d pin=%s cycle_ticks=%d" " default_value=0 max_duration=%d" % ( self._oid, pin, cycle_ticks, max_duration)) self._set_cmd = mcu.lookup_command( "schedule_soft_pwm_out oid=%c clock=%u value=%c") self.print_to_mcu_time = mcu.print_to_mcu_time def set_pwm(self, mcu_time, value): clock = int(mcu_time * self._mcu_freq) msg = self._set_cmd.encode(self._oid, clock, value) self._mcu.send(msg, minclock=self._last_clock, reqclock=clock , cq=self._cmd_queue) self._last_clock = clock class MCU_adc: ADC_MAX = 1024 # 10bit adc def __init__(self, mcu, pin): self._mcu = mcu self._oid = mcu.create_oid() self._min_sample = 0 self._max_sample = 0xffff self._sample_ticks = 0 self._sample_count = 1 self._report_clock = 0 self._callback = None self._inv_max_adc = 0. self._mcu_freq = mcu.get_mcu_freq() self._cmd_queue = mcu.alloc_command_queue() mcu.add_config_cmd("config_analog_in oid=%d pin=%s" % (self._oid, pin)) mcu.add_init_callback(self._init_callback) mcu.register_msg(self._handle_analog_in_state, "analog_in_state" , self._oid) self._query_cmd = mcu.lookup_command( "query_analog_in oid=%c clock=%u sample_ticks=%u sample_count=%c" " rest_ticks=%u min_value=%hu max_value=%hu") def set_minmax(self, sample_time, sample_count, minval=None, maxval=None): self._sample_ticks = int(sample_time * self._mcu_freq) self._sample_count = sample_count if minval is None: minval = 0 if maxval is None: maxval = 0xffff max_adc = sample_count * self.ADC_MAX self._min_sample = int(minval * max_adc) self._max_sample = min(0xffff, int(math.ceil(maxval * max_adc))) self._inv_max_adc = 1.0 / max_adc def _init_callback(self): cur_clock = self._mcu.get_last_clock() clock = cur_clock + int(self._mcu_freq * (1.0 + self._oid * 0.01)) # XXX msg = self._query_cmd.encode( self._oid, clock, self._sample_ticks, self._sample_count , self._report_clock, self._min_sample, self._max_sample) self._mcu.send(msg, reqclock=clock, cq=self._cmd_queue) def _handle_analog_in_state(self, params): last_value = params['value'] * self._inv_max_adc next_clock = self._mcu.serial.translate_clock(params['next_clock']) last_read_time = (next_clock - self._report_clock) / self._mcu_freq if self._callback is not None: self._callback(last_read_time, last_value) def set_adc_callback(self, report_time, callback): self._report_clock = int(report_time * self._mcu_freq) self._callback = callback class MCU: def __init__(self, printer, config): self._printer = printer self._config = config # Serial port baud = config.getint('baud', 115200) serialport = config.get('serial', '/dev/ttyS0') self.serial = serialhdl.SerialReader(printer.reactor, serialport, baud) self.is_shutdown = False self._is_fileoutput = False # Config building self._emergency_stop_cmd = None self._num_oids = 0 self._config_cmds = [] self._config_crc = None self._init_callbacks = [] # Move command queuing ffi_main, self.ffi_lib = chelper.get_ffi() self._steppers = [] self._steppersync = None # Print time to clock epoch calculations self._print_start_time = 0. self._mcu_freq = 0. # Stats self._mcu_tick_avg = 0. self._mcu_tick_stddev = 0. def handle_mcu_stats(self, params): logging.debug("mcu stats: %s" % (params,)) count = params['count'] tick_sum = params['sum'] c = 1.0 / (count * self._mcu_freq) self._mcu_tick_avg = tick_sum * c tick_sumsq = params['sumsq'] tick_sumavgsq = ((tick_sum // (256*count)) * count)**2 self._mcu_tick_stddev = c * 256. * math.sqrt( count * tick_sumsq - tick_sumavgsq) def handle_shutdown(self, params): if self.is_shutdown: return self.is_shutdown = True logging.info("%s: %s" % (params['#name'], params['#msg'])) self.serial.dump_debug() self._printer.note_shutdown() # Connection phase def connect(self): if not self._is_fileoutput: self.serial.connect() self._mcu_freq = float(self.serial.msgparser.config['CLOCK_FREQ']) self.register_msg(self.handle_shutdown, 'shutdown') self.register_msg(self.handle_shutdown, 'is_shutdown') self.register_msg(self.handle_mcu_stats, 'stats') def connect_file(self, debugoutput, dictionary, pace=False): self._is_fileoutput = True self.serial.connect_file(debugoutput, dictionary) if not pace: def dummy_set_print_start_time(eventtime): pass def dummy_get_print_buffer_time(eventtime, last_move_end): return 0.250 self.set_print_start_time = dummy_set_print_start_time self.get_print_buffer_time = dummy_get_print_buffer_time def disconnect(self): self.serial.disconnect() if self._steppersync is not None: self.ffi_lib.steppersync_free(self._steppersync) self._steppersync = None def stats(self, eventtime): stats = self.serial.stats(eventtime) stats += " mcu_task_avg=%.06f mcu_task_stddev=%.06f" % ( self._mcu_tick_avg, self._mcu_tick_stddev) err = 0 for s in self._steppers: err += s.get_errors() if err: stats += " step_errors=%d" % (err,) return stats def force_shutdown(self): self.send(self._emergency_stop_cmd.encode()) def is_fileoutput(self): return self._is_fileoutput # Configuration phase def _add_custom(self): data = self._config.get('custom', '') for line in data.split('\n'): line = line.strip() cpos = line.find('#') if cpos >= 0: line = line[:cpos].strip() if not line: continue self.add_config_cmd(line) def build_config(self): self._emergency_stop_cmd = self.lookup_command("emergency_stop") # Build config commands self._add_custom() self._config_cmds.insert(0, "allocate_oids count=%d" % ( self._num_oids,)) # Resolve pin names mcu = self.serial.msgparser.config['MCU'] pin_map = self._config.get('pin_map') if pin_map is None: pnames = pins.mcu_to_pins(mcu) else: pnames = pins.map_pins(pin_map, mcu) self._config_cmds = [pins.update_command(c, pnames) for c in self._config_cmds] # Calculate config CRC self._config_crc = zlib.crc32('\n'.join(self._config_cmds)) & 0xffffffff self.add_config_cmd("finalize_config crc=%d" % (self._config_crc,)) self._send_config() def _send_config(self): msg = self.create_command("get_config") if self._is_fileoutput: config_params = { 'is_config': 0, 'move_count': 500, 'crc': self._config_crc} else: config_params = self.serial.send_with_response(msg, 'config') if not config_params['is_config']: # Send config commands for c in self._config_cmds: self.send(self.create_command(c)) if not self._is_fileoutput: config_params = self.serial.send_with_response(msg, 'config') if self._config_crc != config_params['crc']: logging.error("Printer CRC does not match config") sys.exit(1) logging.info("Configured") stepqueues = tuple(s._stepqueue for s in self._steppers) self._steppersync = self.ffi_lib.steppersync_alloc( self.serial.serialqueue, stepqueues, len(stepqueues), config_params['move_count']) for cb in self._init_callbacks: cb() # Config creation helpers def create_oid(self): oid = self._num_oids self._num_oids += 1 return oid def add_config_cmd(self, cmd): self._config_cmds.append(cmd) def add_init_callback(self, callback): self._init_callbacks.append(callback) def register_msg(self, cb, msg, oid=None): self.serial.register_callback(cb, msg, oid) def register_stepper(self, stepper): self._steppers.append(stepper) def alloc_command_queue(self): return self.serial.alloc_command_queue() def lookup_command(self, msgformat): return self.serial.msgparser.lookup_command(msgformat) def create_command(self, msg): return self.serial.msgparser.create_command(msg) # Wrappers for mcu object creation def create_stepper(self, step_pin, dir_pin, min_stop_interval, max_error): return MCU_stepper(self, step_pin, dir_pin, min_stop_interval, max_error) def create_endstop(self, pin, stepper): return MCU_endstop(self, pin, stepper) def create_digital_out(self, pin, max_duration=2.): max_duration = int(max_duration * self._mcu_freq) return MCU_digital_out(self, pin, max_duration) def create_pwm(self, pin, hard_cycle_ticks, max_duration=2.): max_duration = int(max_duration * self._mcu_freq) if hard_cycle_ticks: return MCU_pwm(self, pin, hard_cycle_ticks, max_duration) if hard_cycle_ticks < 0: return MCU_digital_out(self, pin, max_duration) cycle_ticks = int(self._mcu_freq / 10.) return MCU_pwm(self, pin, cycle_ticks, max_duration, hard_pwm=False) def create_adc(self, pin): return MCU_adc(self, pin) # Clock syncing def set_print_start_time(self, eventtime): est_mcu_time = self.serial.get_clock(eventtime) / self._mcu_freq self._print_start_time = est_mcu_time def get_print_buffer_time(self, eventtime, print_time): mcu_time = print_time + self._print_start_time est_mcu_time = self.serial.get_clock(eventtime) / self._mcu_freq return mcu_time - est_mcu_time def print_to_mcu_time(self, print_time): return print_time + self._print_start_time def get_mcu_freq(self): return self._mcu_freq def get_last_clock(self): return self.serial.get_last_clock() # Move command queuing def send(self, cmd, minclock=0, reqclock=0, cq=None): self.serial.send(cmd, minclock, reqclock, cq=cq) def flush_moves(self, print_time): mcu_time = print_time + self._print_start_time clock = int(mcu_time * self._mcu_freq) self.ffi_lib.steppersync_flush(self._steppersync, clock) def __del__(self): self.disconnect()