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import crc16
import constants
import database_records
import datetime
import serial
import sys
import time
import packetwriter
import struct
import re
import util
import xml.etree.ElementTree as ET
import platform
class ReadPacket(object):
def __init__(self, command, data):
self._command = command
self._data = data
@property
def command(self):
return self._command
@property
def data(self):
return self._data
class Dexcom(object):
@staticmethod
def FindDevice():
return util.find_usbserial(constants.DEXCOM_G4_USB_VENDOR,
constants.DEXCOM_G4_USB_PRODUCT)
@classmethod
def LocateAndDownload(cls):
device = cls.FindDevice()
if not device:
sys.stderr.write('Could not find Dexcom G4 Receiver!\n')
sys.exit(1)
else:
dex = cls(device)
print ('Found %s S/N: %s'
% (dex.GetFirmwareHeader().get('ProductName'),
dex.ReadManufacturingData().get('SerialNumber')))
print 'Transmitter paired: %s' % dex.ReadTransmitterId()
print 'Battery Status: %s (%d%%)' % (dex.ReadBatteryState(),
dex.ReadBatteryLevel())
print 'Record count:'
print '- Meter records: %d' % (len(dex.ReadRecords('METER_DATA')))
print '- CGM records: %d' % (len(dex.ReadRecords('EGV_DATA')))
print ('- CGM commitable records: %d'
% (len([not x.display_only for x in dex.ReadRecords('EGV_DATA')])))
print '- Event records: %d' % (len(dex.ReadRecords('USER_EVENT_DATA')))
print '- Insertion records: %d' % (len(dex.ReadRecords('INSERTION_TIME')))
def __init__(self, port):
self._port_name = port
self._port = None
def Connect(self):
if self._port is None:
self._port = serial.Serial(port=self._port_name, baudrate=115200)
def Disconnect(self):
if self._port is not None:
self._port.close()
@property
def port(self):
if self._port is None:
self.Connect()
return self._port
def write(self, *args, **kwargs):
return self.port.write(*args, **kwargs)
def read(self, *args, **kwargs):
return self.port.read(*args, **kwargs)
def readpacket(self, timeout=None):
total_read = 4
initial_read = self.read(total_read)
all_data = initial_read
if ord(initial_read[0]) == 1:
command = initial_read[3]
data_number = struct.unpack('<H', initial_read[1:3])[0]
if data_number > 6:
toread = abs(data_number-6)
second_read = self.read(toread)
all_data += second_read
total_read += toread
out = second_read
else:
out = ''
suffix = self.read(2)
sent_crc = struct.unpack('<H', suffix)[0]
local_crc = crc16.crc16(all_data, 0, total_read)
if sent_crc != local_crc:
raise constants.CrcError("readpacket Failed CRC check")
num1 = total_read + 2
return ReadPacket(command, out)
else:
raise constants.Error('Error reading packet header!')
def Ping(self):
self.WriteCommand(constants.PING)
packet = self.readpacket()
return ord(packet.command) == constants.ACK
def WritePacket(self, packet):
if not packet:
raise constants.Error('Need a packet to send')
packetlen = len(packet)
if packetlen < 6 or packetlen > 1590:
raise constants.Error('Invalid packet length')
self.flush()
self.write(packet)
def WriteCommand(self, command_id, *args, **kwargs):
p = packetwriter.PacketWriter()
p.ComposePacket(command_id, *args, **kwargs)
self.WritePacket(p.PacketString())
def GenericReadCommand(self, command_id):
self.WriteCommand(command_id)
return self.readpacket()
def ReadTransmitterId(self):
return self.GenericReadCommand(constants.READ_TRANSMITTER_ID).data
def ReadLanguage(self):
lang = self.GenericReadCommand(constants.READ_LANGUAGE).data
return constants.LANGUAGES[struct.unpack('H', lang)[0]]
def ReadBatteryLevel(self):
level = self.GenericReadCommand(constants.READ_BATTERY_LEVEL).data
return struct.unpack('I', level)[0]
def ReadBatteryState(self):
state = self.GenericReadCommand(constants.READ_BATTERY_STATE).data
return constants.BATTERY_STATES[ord(state)]
def ReadRTC(self):
rtc = self.GenericReadCommand(constants.READ_RTC).data
return util.ReceiverTimeToTime(struct.unpack('I', rtc)[0])
def ReadSystemTime(self):
rtc = self.GenericReadCommand(constants.READ_SYSTEM_TIME).data
return util.ReceiverTimeToTime(struct.unpack('I', rtc)[0])
def ReadSystemTimeOffset(self):
rtc = self.GenericReadCommand(constants.READ_SYSTEM_TIME_OFFSET).data
return datetime.timedelta(seconds=struct.unpack('i', rtc)[0])
def ReadDisplayTimeOffset(self):
rtc = self.GenericReadCommand(constants.READ_DISPLAY_TIME_OFFSET).data
return datetime.timedelta(seconds=struct.unpack('i', rtc)[0])
def ReadDisplayTime(self):
return self.ReadSystemTime() + self.ReadDisplayTimeOffset()
def ReadGlucoseUnit(self):
UNIT_TYPE = (None, 'mg/dL', 'mmol/L')
gu = self.GenericReadCommand(constants.READ_GLUCOSE_UNIT).data
return UNIT_TYPE[ord(gu[0])]
def ReadClockMode(self):
CLOCK_MODE = (24, 12)
cm = self.GenericReadCommand(constants.READ_CLOCK_MODE).data
return CLOCK_MODE[ord(cm[0])]
def ReadDeviceMode(self):
return self.GenericReadCommand(constants.READ_DEVICE_MODE).data
def ReadManufacturingData(self):
data = self.ReadRecords('MANUFACTURING_DATA')[0].xmldata
return ET.fromstring(data)
def flush(self):
self.port.flush()
def clear(self):
self.port.flushInput()
self.port.flushOutput()
def GetFirmwareHeader(self):
i = self.GenericReadCommand(constants.READ_FIRMWARE_HEADER)
return ET.fromstring(i.data)
def GetFirmwareSettings(self):
i = self.GenericReadCommand(constants.READ_FIRMWARE_SETTINGS)
return ET.fromstring(i.data)
def DataPartitions(self):
i = self.GenericReadCommand(constants.READ_DATABASE_PARTITION_INFO)
return ET.fromstring(i.data)
def ReadDatabasePageRange(self, record_type):
record_type_index = constants.RECORD_TYPES.index(record_type)
self.WriteCommand(constants.READ_DATABASE_PAGE_RANGE,
chr(record_type_index))
packet = self.readpacket()
return struct.unpack('II', packet.data)
def ReadDatabasePage(self, record_type, page):
record_type_index = constants.RECORD_TYPES.index(record_type)
self.WriteCommand(constants.READ_DATABASE_PAGES,
(chr(record_type_index), struct.pack('I', page), chr(1)))
packet = self.readpacket()
assert ord(packet.command) == 1
# first index (uint), numrec (uint), record_type (byte), revision (byte),
# page# (uint), r1 (uint), r2 (uint), r3 (uint), ushort (Crc)
header_format = '<2I2c4IH'
header_data_len = struct.calcsize(header_format)
header = struct.unpack_from(header_format, packet.data)
header_crc = crc16.crc16(packet.data[:header_data_len-2])
assert header_crc == header[-1]
assert ord(header[2]) == record_type_index
assert header[4] == page
packet_data = packet.data[header_data_len:]
return self.ParsePage(header, packet_data)
def GenericRecordYielder(self, header, data, record_type):
for x in xrange(header[1]):
yield record_type.Create(data, x)
def ParsePage(self, header, data):
record_type = constants.RECORD_TYPES[ord(header[2])]
generic_parser_map = {
'USER_EVENT_DATA': database_records.EventRecord,
'METER_DATA': database_records.MeterRecord,
'INSERTION_TIME': database_records.InsertionRecord,
'EGV_DATA': database_records.EGVRecord,
'SENSOR_DATA': database_records.SensorRecord,
}
xml_parsed = ['PC_SOFTWARE_PARAMETER', 'MANUFACTURING_DATA']
if record_type in generic_parser_map:
return self.GenericRecordYielder(header, data,
generic_parser_map[record_type])
elif record_type in xml_parsed:
return [database_records.GenericXMLRecord.Create(data, 0)]
else:
raise NotImplementedError('Parsing of %s has not yet been implemented'
% record_type)
def iter_records (self, record_type):
assert record_type in constants.RECORD_TYPES
page_range = self.ReadDatabasePageRange(record_type)
start, end = page_range
if start != end or not end:
end += 1
for x in reversed(xrange(start, end)):
records = list(self.ReadDatabasePage(record_type, x))
records.reverse( )
for record in records:
yield record
def ReadRecords(self, record_type):
records = []
assert record_type in constants.RECORD_TYPES
page_range = self.ReadDatabasePageRange(record_type)
start, end = page_range
if start != end or not end:
end += 1
for x in range(start, end):
records.extend(self.ReadDatabasePage(record_type, x))
return records
if __name__ == '__main__':
Dexcom.LocateAndDownload()
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