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# -*- coding: utf-8 -*-
"""Driver for FreeStyle Libre CGM devices."""
__author__ = 'Diego Elio Pettenò'
__email__ = 'flameeyes@flameeyes.eu'
__copyright__ = 'Copyright © 2017, Diego Elio Pettenò'
__license__ = 'MIT'
import datetime
from glucometerutils import common
from glucometerutils.support import freestyle
# Fields of the records returned by $history?
# Tuple of pairs of idx and field name
_HISTORY_ENTRY_MAP = (
(2, 'month'),
(3, 'day'),
(4, 'year'), # 2-digits
(5, 'hour'),
(6, 'minute'),
(7, 'second'),
(13, 'value'),
(15, 'errors'),
)
class Device(freestyle.FreeStyleHidDevice):
"""Glucometer driver for FreeStyle Libre devices."""
def get_meter_info(self):
"""Return the device information in structured form."""
return common.MeterInfo(
'FreeStyle Libre',
serial_number=self.get_serial_number(),
version_info=(
'Software version: ' + self._get_version(),),
native_unit=self.get_glucose_unit())
def get_serial_number(self):
"""Overridden function as the command is not compatible."""
return self._send_text_command(b'$sn?').rstrip('\r\n')
def get_glucose_unit(self):
"""Returns the glucose unit of the device."""
# TODO(Flameeyes): figure out how to identify the actual unit on the
# device.
return common.UNIT_MGDL
def get_readings(self):
for record in self._get_multirecord(b'$history?'):
if not record:
continue
parsed_record = {
key: int(record[idx])
for idx, key in _HISTORY_ENTRY_MAP
}
if parsed_record['errors'] != 0:
# The reading is considered invalid, so ignore it.
continue
timestamp = datetime.datetime(
parsed_record['year'] + 2000,
parsed_record['month'],
parsed_record['day'],
parsed_record['hour'],
parsed_record['minute'],
parsed_record['second'])
yield common.Reading(timestamp, parsed_record['value'],
comment='(Sensor)')
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