def get_device_settings(self, address):
# Compute ASCII representation of device address.
address = OneWireBus.device_address_ascii(address)
# Get device-specific settings from configuration.
for device_settings in self.settings.get('devices', []):
if device_settings['address'] == address:
return device_settings
return {}
def read_devices(self):
"""
:param devices:
"""
data = {}
devices = self.get_effective_devices()
for device in devices:
address = OneWireBus.device_address_ascii(device)
log.info('Reading DS18X20 device "{}"'.format(address))
try:
value = self.driver.read_temp(device)
except Exception as ex:
log.exc(ex, "Reading DS18X20 device {} failed".format(address))
continue
# Evaluate device response.
if value is not None:
# TODO: Mask power-on reset value 0550h (85°) here.
# https://github.com/micropython/micropython/pull/5338
# Maybe it's not only 85°. Sometimes it's also 25°(!).
# https://github.com/cpetrich/counterfeit_DS18B20
try:
# Compute telemetry field name.
fieldname = self.format_fieldname('temperature', address)
# Apply value offset.
offset = self.get_setting(address, 'offset')
if offset is not None:
log.info(
'Adding offset {} to value {} from device "{}"'.
format(offset, value, address))
value += offset
# Add value to telemetry message.
data[fieldname] = value
except Exception as ex:
log.exc(
ex, 'Processing data from DS18X20 device "{}" failed'.
format(address))
continue
else:
log.warning(
'No response from DS18X20 device "{}"'.format(address))
return data
def read_devices(self):
"""
:param devices:
"""
data = {}
devices = self.get_effective_devices()
for device in devices:
address = OneWireBus.device_address_ascii(device)
log.info('Reading DS18X20 device "{}"'.format(address))
try:
value = self.driver.read_temp(device)
except Exception as ex:
log.exc(ex, "Reading DS18X20 device {} failed".format(address))
continue
# Evaluate device response.
if value is not None:
# TODO: Filter the 85° thing here.
try:
# Compute telemetry field name.
fieldname = self.format_fieldname('temperature', address)
# Apply value offset.
offset = self.get_setting(address, 'offset')
if offset is not None:
log.info(
'Adding offset {} to value {} from device "{}"'.
format(offset, value, address))
value += offset
# Add value to telemetry message.
data[fieldname] = value
except Exception as ex:
log.exc(
ex, 'Processing data from DS18X20 device "{}" failed'.
format(address))
continue
else:
log.warning(
'No response from DS18X20 device "{}"'.format(address))
return data
def get_effective_devices(self):
""" """
log.info('Start conversion for DS18X20 devices on bus "{}"'.format(self.bus.name))
effective_devices = []
for device in self.bus.devices:
address = OneWireBus.device_address_ascii(device)
device_settings = self.get_device_settings(address)
enabled = device_settings.get('enabled')
if enabled is False:
log.info('Skipping DS18X20 device "{}"'.format(address))
continue
effective_devices.append(device)
return effective_devices
def read_devices(self, devices):
data = {}
for device in devices:
address = OneWireBus.device_address_ascii(device)
log.info('Reading DS18X20 device "{}"'.format(address))
try:
value = self.driver.read_temp_async(device)
except:
log.exception(
"Reading DS18X20 device {} failed".format(address))
continue
# Evaluate device response.
if value is not None:
try:
# Compute telemetry field name.
fieldname = self.format_fieldname('temperature', address)
# Apply value offset.
offset = self.get_setting(address, 'offset')
if offset is not None:
log.info(
'Adding offset {} to value {} from device "{}"'.
format(offset, value, address))
value += offset
# Add value to telemetry message.
data[fieldname] = value
except:
log.exception(
'Processing data from DS18X20 device "{}" failed'.
format(address))
continue
else:
log.warning(
'No response from DS18X20 device "{}"'.format(address))
return data