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# -*- coding: utf-8 -*-
#
# SPDX-License-Identifier: MIT
"""Driver for FreeStyle Precision Neo devices.
This driver may also work with FreeStyle Optium Neo devices, but it is currently
untested.
Supported features:
- get readings;
- get and set date and time;
- get serial number and software version.
Expected device path: /dev/hidraw9 or similar HID device. Optional when using
HIDAPI.
Further information on the device protocol can be found at
https://flameeyes.github.io/glucometer-protocols/abbott/freestyle-precision-neo
"""
import collections
import datetime
from glucometerutils import common
from glucometerutils.support import freestyle
# The type is a string because it precedes the parsing of the object.
_TYPE_GLUCOSE_READING = '7'
_TYPE_KETONE_READING = '9'
_NeoReading = collections.namedtuple('_NeoReading', (
'type', # 7 = blood glucose, 9 = blood ketone
'id',
'month', 'day', 'year', # year is two-digits
'hour', 'minute',
'unknown2',
'value',
# Extra trailing and so-far-unused fields; so discard them:
# * for blood glucose: 10 unknown trailing fields
#'unknown3', 'unknown4', 'unknown5', 'unknown6', 'unknown7',
#'unknown8', 'unknown9', 'unknown10', 'unknown11', 'unknown12',
# * for blood ketone: 2 unknown trailing fields
#'unknown3', 'unknown4',
))
class Device(freestyle.FreeStyleHidDevice):
"""Glucometer driver for FreeStyle Precision Neo devices."""
USB_PRODUCT_ID = 0x3850
def get_meter_info(self):
"""Return the device information in structured form."""
return common.MeterInfo(
'FreeStyle Precision Neo',
serial_number=self.get_serial_number(),
version_info=(
'Software version: ' + self._get_version(),),
native_unit=self.get_glucose_unit())
def get_glucose_unit(self): # pylint: disable=no-self-use
"""Returns the glucose unit of the device."""
return common.Unit.MG_DL
def get_readings(self):
"""Iterate through the reading records in the device."""
for record in self._get_multirecord(b'$result?'):
cls = None
if record and record[0] == _TYPE_GLUCOSE_READING:
cls = common.GlucoseReading
elif record and record[0] == _TYPE_KETONE_READING:
cls = common.KetoneReading
else:
continue
# Build a _reading object by parsing each of the entries in the raw
# record
values = []
for value in record:
if value == "HI":
value = float("inf")
values.append(int(value))
raw_reading = _NeoReading._make(values[:len(_NeoReading._fields)])
timestamp = datetime.datetime(
raw_reading.year + 2000, raw_reading.month, raw_reading.day,
raw_reading.hour, raw_reading.minute)
yield cls(timestamp, raw_reading.value)
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