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# -*- coding: utf-8 -*-
"""Support module for the LifeScan binary protocol.
A number of LifeScan devices use a semi-compatible binary protocol to talk host
and device, which is (vastly) compatible.
This module implements an interface to send and receive these messages.
"""
__author__ = 'Diego Elio Pettenò'
__email__ = 'flameeyes@flameeyes.eu'
__copyright__ = 'Copyright © 2014-2018, Diego Elio Pettenò'
__license__ = 'MIT'
import construct
from glucometerutils import common
from glucometerutils.support import construct_extras
from glucometerutils.support import lifescan
_LINK_CONTROL = construct.BitStruct(
construct.Padding(3),
'more' / construct.Default(construct.Flag, False),
'disconnect' / construct.Default(construct.Flag, False),
'acknowledge' / construct.Default(construct.Flag, False),
'expect_receive' / construct.Default(construct.Flag, False),
'sequence_number' / construct.Default(construct.Flag, False),
)
def LifeScanPacket(include_link_control): # pylint: disable=invalid-name
# type: (bool) -> construct.Struct
if include_link_control:
link_control_construct = _LINK_CONTROL
else:
link_control_construct = construct.Const(b'\x00')
return construct.Struct(
'data' / construct.RawCopy(
construct.Struct(
construct.Const(b'\x02'), # stx
'length' / construct.Rebuild(
construct.Byte, lambda this: len(this.message) + 6),
'link_control' / link_control_construct,
'message' / construct.Bytes(
lambda this: this.length - 6),
construct.Const(b'\x03'), # etx
),
),
'checksum' / construct.Checksum(
construct.Int16ul, lifescan.crc_ccitt, construct.this.data.data),
)
VERIO_TIMESTAMP = construct_extras.Timestamp(
construct.Int32ul, epoch=946684800) # 2000-01-01 (not 2010)
_GLUCOSE_UNIT_MAPPING_TABLE = {
common.Unit.MG_DL: 0x00,
common.Unit.MMOL_L: 0x01,
}
GLUCOSE_UNIT = construct.Mapping(
construct.Byte, _GLUCOSE_UNIT_MAPPING_TABLE)
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