81 lines
2.8 KiB
Python
81 lines
2.8 KiB
Python
# Support for 1-wire based temperature sensors
|
|
#
|
|
# Copyright (C) 2020 Alan Lord <alanslists@gmail.com>
|
|
#
|
|
# This file may be distributed under the terms of the GNU GPLv3 license.
|
|
import logging
|
|
import mcu
|
|
|
|
DS18_REPORT_TIME = 3.0
|
|
# Temperature can be sampled at any time but conversion time is ~750ms, so
|
|
# setting the time too low will not make the reports come faster.
|
|
DS18_MIN_REPORT_TIME = 1.0
|
|
DS18_MAX_CONSECUTIVE_ERRORS = 4
|
|
|
|
class DS18B20:
|
|
def __init__(self, config):
|
|
self.printer = config.get_printer()
|
|
self.name = config.get_name().split()[-1]
|
|
self.sensor_id = bytearray(config.get("serial_no").encode())
|
|
self.temp = self.min_temp = self.max_temp = 0.0
|
|
self._report_clock = 0
|
|
self.report_time = config.getfloat(
|
|
'ds18_report_time',
|
|
DS18_REPORT_TIME,
|
|
minval=DS18_MIN_REPORT_TIME
|
|
)
|
|
self._mcu = mcu.get_printer_mcu(self.printer, config.get('sensor_mcu'))
|
|
self.oid = self._mcu.create_oid()
|
|
self._mcu.register_response(self._handle_ds18b20_response,
|
|
"ds18b20_result", self.oid)
|
|
self._mcu.register_config_callback(self._build_config)
|
|
|
|
def _build_config(self):
|
|
sid = "".join(["%02x" % (x,) for x in self.sensor_id])
|
|
self._mcu.add_config_cmd(
|
|
"config_ds18b20 oid=%d serial=%s max_error_count=%d"
|
|
% (self.oid, sid, DS18_MAX_CONSECUTIVE_ERRORS))
|
|
|
|
clock = self._mcu.get_query_slot(self.oid)
|
|
self._report_clock = self._mcu.seconds_to_clock(self.report_time)
|
|
self._mcu.add_config_cmd("query_ds18b20 oid=%d clock=%u rest_ticks=%u"
|
|
" min_value=%d max_value=%d" % (
|
|
self.oid, clock, self._report_clock,
|
|
self.min_temp * 1000, self.max_temp * 1000), is_init=True)
|
|
|
|
def _handle_ds18b20_response(self, params):
|
|
temp = params['value'] / 1000.0
|
|
|
|
if params["fault"]:
|
|
logging.info("ds18b20 reports fault %d (temp=%0.1f)",
|
|
params["fault"], temp)
|
|
return
|
|
|
|
next_clock = self._mcu.clock32_to_clock64(params['next_clock'])
|
|
last_read_clock = next_clock - self._report_clock
|
|
last_read_time = self._mcu.clock_to_print_time(last_read_clock)
|
|
self._callback(last_read_time, temp)
|
|
|
|
def setup_minmax(self, min_temp, max_temp):
|
|
self.min_temp = min_temp
|
|
self.max_temp = max_temp
|
|
|
|
def fault(self, msg):
|
|
self.printer.invoke_async_shutdown(msg)
|
|
|
|
def get_report_time_delta(self):
|
|
return self.report_time
|
|
|
|
def setup_callback(self, cb):
|
|
self._callback = cb
|
|
|
|
def get_status(self, eventtime):
|
|
return {
|
|
'temperature': round(self.temp, 2),
|
|
}
|
|
|
|
def load_config(config):
|
|
# Register sensor
|
|
pheaters = config.get_printer().load_object(config, "heaters")
|
|
pheaters.add_sensor_factory("DS18B20", DS18B20)
|