79 lines
2.8 KiB
Python
79 lines
2.8 KiB
Python
# Support for 1-wire based temperature sensors
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#
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# Copyright (C) 2020 Alan Lord <alanslists@gmail.com>
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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 logging
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import mcu
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DS18_REPORT_TIME = 3.0
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# Temperature can be sampled at any time but conversion time is ~750ms, so
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# setting the time too low will not make the reports come faster.
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DS18_MIN_REPORT_TIME = 1.0
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class DS18B20:
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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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self.sensor_id = bytearray(config.get("serial_no").encode())
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self.temp = self.min_temp = self.max_temp = 0.0
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self._report_clock = 0
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self.report_time = config.getfloat(
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'ds18_report_time',
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DS18_REPORT_TIME,
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minval=DS18_MIN_REPORT_TIME
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)
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self._mcu = mcu.get_printer_mcu(self.printer, config.get('sensor_mcu'))
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self.oid = self._mcu.create_oid()
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self._mcu.register_response(self._handle_ds18b20_response,
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"ds18b20_result", self.oid)
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self._mcu.register_config_callback(self._build_config)
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def _build_config(self):
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sid = "".join(["%02x" % (x,) for x in self.sensor_id])
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self._mcu.add_config_cmd("config_ds18b20 oid=%d serial=%s"
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% (self.oid, sid))
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clock = self._mcu.get_query_slot(self.oid)
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self._report_clock = self._mcu.seconds_to_clock(self.report_time)
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self._mcu.add_config_cmd("query_ds18b20 oid=%d clock=%u rest_ticks=%u"
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" min_value=%d max_value=%d" % (
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self.oid, clock, self._report_clock,
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self.min_temp * 1000, self.max_temp * 1000), is_init=True)
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def _handle_ds18b20_response(self, params):
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temp = params['value'] / 1000.0
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if temp < self.min_temp or temp > self.max_temp:
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self.printer.invoke_shutdown(
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"DS18B20 temperature %0.1f outside range of %0.1f:%.01f"
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% (temp, self.min_temp, self.max_temp))
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next_clock = self._mcu.clock32_to_clock64(params['next_clock'])
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last_read_clock = next_clock - self._report_clock
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last_read_time = self._mcu.clock_to_print_time(last_read_clock)
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self._callback(last_read_time, temp)
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def setup_minmax(self, min_temp, max_temp):
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self.min_temp = min_temp
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self.max_temp = max_temp
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def fault(self, msg):
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self.printer.invoke_async_shutdown(msg)
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def get_report_time_delta(self):
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return self.report_time
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def setup_callback(self, cb):
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self._callback = cb
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def get_status(self, eventtime):
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return {
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'temperature': round(self.temp, 2),
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}
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def load_config(config):
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# Register sensor
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pheaters = config.get_printer().load_object(config, "heaters")
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pheaters.add_sensor_factory("DS18B20", DS18B20)
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