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# -*- coding: utf-8 -*-
#
# SPDX-License-Identifier: MIT
"""Driver for ContourUSB devices.
Supported features:
- get readings (blood glucose), including comments;
- get date and time;
- get serial number and software version;
- get device info (e.g. unit)
Expected device path: /dev/hidraw4 or similar HID device. Optional when using
HIDAPI.
Further information on the device protocol can be found at
http://protocols.ascensia.com/Programming-Guide.aspx
"""
import datetime
from glucometerutils import common
from glucometerutils.support import contourusb
def _extract_timestamp(parsed_record, prefix=""):
"""Extract the timestamp from a parsed record.
This leverages the fact that all the reading records have the same base structure.
"""
datetime_str = parsed_record["datetime"]
return datetime.datetime(
int(datetime_str[0:4]), # year
int(datetime_str[4:6]), # month
int(datetime_str[6:8]), # day
int(datetime_str[8:10]), # hour
int(datetime_str[10:12]), # minute
0,
)
class Device(contourusb.ContourHidDevice):
"""Glucometer driver for FreeStyle Libre devices."""
def __init__(self, device):
self._hid_session = contourusb.ContourHidSession((0x1A79, 0x6002), device)
def get_meter_info(self):
self._get_info_record()
return common.MeterInfo(
"Contour USB",
serial_number=self._get_serial_number(),
version_info=("Meter versions: " + self._get_version(),),
native_unit=self.get_glucose_unit(),
)
def get_glucose_unit(self): # pylint: disable=no-self-use
if self._get_glucose_unit() == "0":
return common.Unit.MG_DL
else:
return common.Unit.MMOL_L
def get_readings(self):
"""
Get reading dump from download data mode(all readings stored)
This meter supports only blood samples
"""
for parsed_record in self._get_multirecord():
yield common.GlucoseReading(
_extract_timestamp(parsed_record),
int(parsed_record["value"]),
comment=parsed_record["markers"],
measure_method=common.MeasurementMethod.BLOOD_SAMPLE,
)
def get_serial_number(self):
raise NotImplementedError
def _set_device_datetime(self, date):
raise NotImplementedError
def zero_log(self):
raise NotImplementedError
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