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# -*- coding: utf-8 -*-
#
# SPDX-FileCopyrightText: © 2021 Stefanie Tellex
# SPDX-License-Identifier: MIT
"""Driver for FreeStyle Freedom Lite devices.
Supported features:
- get readings (ignores ketone results);
- use the glucose unit preset on the device by default;
- get and set date and time;
- get serial number and software version.
Expected device path: /dev/ttyUSB0 or similar serial port device.
Further information on the device protocol can be found at
https://protocols.glucometers.tech/abbott/freestyle-lite.html
"""
import datetime
import logging
import re
from typing import Generator, NoReturn, Sequence
from glucometerutils import common, driver, exceptions
from glucometerutils.support import serial
_CLOCK_INIT_RE = re.compile(
r"^(?P<month>[A-Z][a-z]{2}) (?P<day>[0-9]{2}) (?P<year>[0-9]{4}) "
r"(?P<time>[0-9]{2}:[0-9]{2}:[0-9]{2})$"
)
_CLOCK_READING_RE = re.compile(
r"^(?P<month>[A-Z][a-z]{2}) (?P<day>[0-9]{2}) (?P<year>[0-9]{4}) "
r"(?P<time>[0-9]{2}:[0-9]{2})$"
)
# The reading can be HI (padded to three-characters by a space) if the value was
# over what the meter was supposed to read. Unlike the "Clock:" line, the months
# of June and July are written in full, everything else is truncated to three
# characters, so accept a space or 'e'/'y' at the end of the month name. Also,
# the time does *not* include seconds.
_READING_RE = re.compile(
r"^(?P<reading>HI |[0-9]{3}) "
r"(?P<month>[A-Z][a-z]{2})[ ey] "
r"(?P<day>[0-9]{2}) "
r"(?P<year>[0-9]{4}) "
r"(?P<time>[0-9]{2}:[0-9]{2}) "
r"(?P<type>[GK]) 0x00$"
)
_CHECKSUM_RE = re.compile(r"^(?P<checksum>0x[0-9A-F]{4}) END$")
# There are two date format used by the device. One uses three-letters month
# names, and that's easy enough. The other uses three-letters month names,
# except for (at least) July. So ignore the fourth character.
# explicit mapping. Note that the mapping *requires* a trailing whitespace.
_MONTH_MATCHES = {
"Jan": 1,
"Feb": 2,
"Mar": 3,
"Apr": 4,
"May": 5,
"Jun": 6,
"Jul": 7,
"Aug": 8,
"Sep": 9,
"Oct": 10,
"Nov": 11,
"Dec": 12,
}
def _parse_clock_init(datestr: str) -> datetime.datetime:
"""Convert the date/time string used by the device when it sends the current time into a datetime. This one has seconds.
Args:
datestr: a string as returned by the device during initialization.
"""
match = _CLOCK_INIT_RE.match(datestr)
if not match:
raise exceptions.InvalidResponse(datestr)
# int() parses numbers in decimal, so we don't have to worry about '08'
day = int(match.group("day"))
month = _MONTH_MATCHES[match.group("month")]
year = int(match.group("year"))
hour, minute, second = (int(x) for x in match.group("time").split(":"))
return datetime.datetime(year, month, day, hour, minute, second)
def _parse_clock_reading(datestr: str) -> datetime.datetime:
"""Convert the date/time string used by the device into a datetime.
Args:
datestr: a string as returned by the device during glucose readings into a datetime. This one does not have seconds.
"""
match = _CLOCK_READING_RE.match(datestr)
if not match:
raise exceptions.InvalidResponse(datestr)
# int() parses numbers in decimal, so we don't have to worry about '08'
day = int(match.group("day"))
month = _MONTH_MATCHES[match.group("month")]
year = int(match.group("year"))
hour, minute = (int(x) for x in match.group("time").split(":"))
second = 0
return datetime.datetime(year, month, day, hour, minute, second)
class Device(serial.SerialDevice, driver.GlucometerDevice):
BAUDRATE = 19200
#DEFAULT_CABLE_ID = "1a61:3420"
DEFAULT_CABLE_ID = "0403:6001"
def _send_command(self, command: str) -> Sequence[str]:
cmd_bytes = bytes("$%s\r\n" % command, "ascii")
logging.debug("Sending command: %r", cmd_bytes)
self.serial_.write(cmd_bytes)
self.serial_.flush()
response = self.serial_.readlines()
logging.debug("Received response: %r", response)
# We always want to decode the output, and remove stray \r\n. Any
# failure in decoding means the output is invalid anyway.
decoded_response = [line.decode("ascii").rstrip("\r\n") for line in response]
return decoded_response
def connect(self) -> None:
self._fetch_device_information()
def disconnect(self) -> None: # pylint: disable=no-self-use
return
def _fetch_device_information(self) -> None:
data = self._send_command("mem")
lines = [line for line in data]
self.device_serialno_ = data[1]
self.device_version_ = data[2]
self.device_datetime_ = _parse_clock_init(data[3])
numlines = int(data[4])
self._readings = []
for line in data[6:6+numlines]:
glucose = int(line[0:3])
timestamp = _parse_clock_reading(line[5:23])
self._readings.append(common.GlucoseReading(timestamp, glucose))
def get_meter_info(self) -> common.MeterInfo:
"""Fetch and parses the device information.
Returns:
A common.MeterInfo object.
"""
return common.MeterInfo(
"Freestyle Freedom Lite",
serial_number=self.get_serial_number(),
version_info=("Software version: " + self.get_version(),),
native_unit=self.get_glucose_unit(),
)
def get_version(self) -> str:
"""Returns an identifier of the firmware version of the glucometer.
Returns:
The software version returned by the glucometer, such as "0.22"
"""
return self.device_version_
def get_serial_number(self) -> str:
"""Retrieve the serial number of the device.
Returns:
A string representing the serial number of the device.
"""
return self.device_serialno_
def get_glucose_unit(self) -> common.Unit:
"""Returns a constant representing the unit displayed by the meter.
Returns:
common.Unit.MG_DL: if the glucometer displays in mg/dL
common.Unit.MMOL_L: if the glucometer displays in mmol/L
"""
return common.Unit.MG_DL
def get_datetime(self) -> datetime.datetime:
"""Returns the current date and time for the glucometer.
Returns:
A datetime object built according to the returned response.
"""
return self.device_datetime_
def _set_device_datetime(self, date: datetime.datetime) -> datetime.datetime:
raise NotImplementedError
def zero_log(self) -> NoReturn:
raise NotImplementedError
def get_readings(self) -> Generator[common.AnyReading, None, None]:
"""Iterates over the reading values stored in the glucometer.
Args:
unit: The glucose unit to use for the output.
Yields: A tuple (date, value) of the readings in the glucometer. The
value is a floating point in the unit specified; if no unit is
specified, the default unit in the glucometer will be used.
Raises:
exceptions.InvalidResponse: if the response does not match what '
expected.
"""
for r in self._readings:
yield r
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