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# -*- coding: utf-8 -*-
"""Driver for LifeScan OneTouch Ultra Easy devices.
Also supports OneTouch Ultra Mini devices (different name, same device).
Supported features:
- get readings;
- use the glucose unit preset on the device by default;
- get and set date and time;
- get serial number and software version;
- memory reset (caution!)
Expected device path: /dev/ttyUSB0 or similar serial port device.
"""
__author__ = 'Diego Elio Pettenò'
__email__ = 'flameeyes@flameeyes.eu'
__copyright__ = 'Copyright © 2014-2018, Diego Elio Pettenò'
__license__ = 'MIT'
import binascii
import datetime
import logging
import construct
from glucometerutils import common
from glucometerutils.support import construct_extras
from glucometerutils.support import lifescan
from glucometerutils.support import lifescan_binary_protocol
from glucometerutils.support import serial
_PACKET = lifescan_binary_protocol.LifeScanPacket(
0x05, True)
_INVALID_RECORD = 501
_COMMAND_SUCCESS = construct.Const(b'\x06')
_VERSION_REQUEST = construct.Const(b'\x0d\x02')
_VERSION_RESPONSE = construct.Struct(
_COMMAND_SUCCESS,
'version' / construct.PascalString(construct.Byte, encoding='ascii'),
)
_SERIAL_NUMBER_REQUEST = construct.Const(
b'\x0B\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00')
_SERIAL_NUMBER_RESPONSE = construct.Struct(
_COMMAND_SUCCESS,
'serial_number' / construct.GreedyString(encoding='ascii'),
)
_DATETIME_REQUEST = construct.Struct(
construct.Const(b'\x20'), # 0x20 is the datetime
'request_type' / construct.Enum(construct.Byte, write=0x01, read=0x02),
'timestamp' / construct.Default(
construct_extras.Timestamp(construct.Int32ul),
datetime.datetime(1970, 1, 1, 0, 0)),
)
_DATETIME_RESPONSE = construct.Struct(
_COMMAND_SUCCESS,
'timestamp' / construct_extras.Timestamp(construct.Int32ul),
)
_GLUCOSE_UNIT_REQUEST = construct.Const(
b'\x09\x02\x09\x00\x00\x00\x00')
_GLUCOSE_UNIT_RESPONSE = construct.Struct(
_COMMAND_SUCCESS,
'unit' / lifescan_binary_protocol.GLUCOSE_UNIT,
construct.Padding(3),
)
_MEMORY_ERASE_REQUEST = construct.Const(b'\x1A')
_READING_COUNT_RESPONSE = construct.Struct(
construct.Const(b'\x0f'),
'count' / construct.Int16ul,
)
_READ_RECORD_REQUEST = construct.Struct(
construct.Const(b'\x1f'),
'record_id' / construct.Int16ul,
)
_READING_RESPONSE = construct.Struct(
_COMMAND_SUCCESS,
'timestamp' / construct_extras.Timestamp(construct.Int32ul),
'value' / construct.Int32ul,
)
class Device(serial.SerialDevice):
BAUDRATE = 9600
DEFAULT_CABLE_ID = '067b:2303' # Generic PL2303 cable.
TIMEOUT = 0.5
def __init__(self, device):
super(Device, self).__init__(device)
self.sent_counter_ = False
self.expect_receive_ = False
self.buffered_reader_ = construct.Rebuffered(
_PACKET, tailcutoff=1024)
def connect(self):
try:
self._send_packet(b'', disconnect=True)
self._read_ack()
except construct.ConstructError as e:
raise lifescan.MalformedCommand(str(e))
def disconnect(self):
self.connect()
def _send_packet(self, message, acknowledge=False, disconnect=False):
pkt = _PACKET.build(
{'value': {
'message': message,
'link_control': {
'sequence_number': self.sent_counter_,
'expect_receive': self.expect_receive_,
'acknowledge': acknowledge,
'disconnect': disconnect,
},
}})
logging.debug('sending packet: %s', binascii.hexlify(pkt))
self.serial_.write(pkt)
self.serial_.flush()
def _read_packet(self):
raw_pkt = self.buffered_reader_.parse_stream(self.serial_)
logging.debug('received packet: %r', raw_pkt)
# discard the checksum and copy
pkt = raw_pkt.value
if not pkt.link_control.disconnect and (
pkt.link_control.sequence_number != self.expect_receive_):
raise lifescan.MalformedCommand(
'at position 2[0b] expected %02x, received %02x' % (
self.expect_receive_, pkt.link_connect.sequence_count))
return pkt
def _send_ack(self):
self._send_packet(b'', acknowledge=True, disconnect=False)
def _read_ack(self):
pkt = self._read_packet()
assert pkt.link_control.acknowledge
def _send_request(self, request_format, request_obj, response_format):
try:
request = request_format.build(request_obj)
self._send_packet(request, acknowledge=False, disconnect=False)
self.sent_counter_ = not self.sent_counter_
self._read_ack()
response_pkt = self._read_packet()
assert not response_pkt.link_control.acknowledge
self.expect_receive_ = not self.expect_receive_
self._send_ack()
return response_format.parse(response_pkt.message)
except construct.ConstructError as e:
raise lifescan.MalformedCommand(str(e))
def get_meter_info(self):
return common.MeterInfo(
'OneTouch Ultra Easy glucometer',
serial_number=self.get_serial_number(),
version_info=(
'Software version: ' + self.get_version(),),
native_unit=self.get_glucose_unit())
def get_version(self):
response = self._send_request(
_VERSION_REQUEST, None, _VERSION_RESPONSE)
return response.version
def get_serial_number(self):
response = self._send_request(
_SERIAL_NUMBER_REQUEST, None, _SERIAL_NUMBER_RESPONSE)
return response.serial_number
def get_datetime(self):
response = self._send_request(
_DATETIME_REQUEST, {'request_type': 'read'},
_DATETIME_RESPONSE)
return response.timestamp
def set_datetime(self, date=datetime.datetime.now()):
response = self._send_request(
_DATETIME_REQUEST, {
'request_type': 'write',
'timestamp': date,
}, _DATETIME_RESPONSE)
return response.timestamp
def zero_log(self):
self._send_request(_MEMORY_ERASE_REQUEST, None, _COMMAND_SUCCESS)
def get_glucose_unit(self):
response = self._send_request(
_GLUCOSE_UNIT_REQUEST, None, _GLUCOSE_UNIT_RESPONSE)
return response.unit
def _get_reading_count(self):
response = self._send_request(
_READ_RECORD_REQUEST, {'record_id': _INVALID_RECORD},
_READING_COUNT_RESPONSE)
return response.count
def _get_reading(self, record_id):
response = self._send_request(
_READ_RECORD_REQUEST, {'record_id': record_id}, _READING_RESPONSE)
return common.GlucoseReading(
response.timestamp, float(response.value))
def get_readings(self):
record_count = self._get_reading_count()
for record_id in range(record_count):
yield self._get_reading(record_id)
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