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elm.py
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# -*- coding: utf-8 -*-
'''module contains class for working with ELM327
version: 160829
Borrowed code from PyRen (modified for this use)
'''
import os
import re
import string
import sys
import time
from datetime import datetime
import options
import serial
from serial.tools import list_ports
_ = options.translator('ddt4all')
snat = {
"01": "760", "02": "724", "04": "762", "06": "791", "07": "771", "08": "778", "09": "7EB", "0D": "775",
"0E": "76E", "0F": "770", "11": "7C9", "13": "732", "16": "18DAF271", "1A": "731", "1B": "7AC", "1C": "76B",
"1E": "768", "23": "773", "24": "77D", "25": "700", "26": "765", "27": "76D", "28": "7D7", "29": "764",
"2A": "76F", "2B": "735", "2C": "772", "2D": "18DAF12D", "2E": "7BC", "2F": "76C", "32": "776", "3A": "7D2",
"40": "727", "41": "18DAF1D2", "46": "7CF", "47": "7A8", "4D": "7BD", "50": "738", "51": "763", "57": "767",
"58": "767", "59": "734", "5B": "7A5", "60": "18DAF160", "61": "7BA", "62": "7DD", "63": "73E", "64": "7D5",
"66": "739", "67": "793", "68": "77E", "6B": "7B5", "6E": "7E9", "73": "18DAF273", "77": "7DA", "78": "7BD",
"79": "7EA", "7A": "7E8", "7C": "77C", "81": "761", "82": "7AD", "86": "7A2", "87": "7A0", "91": "7ED",
"93": "7BB", "95": "7EC", "97": "7C8", "A1": "76C", "A5": "725", "A6": "726", "A7": "733", "A8": "7B6",
"C0": "7B9", "D0": "18DAF1D0", "D1": "7EE", "D2": "18DAF1D2", "D3": "7EE", "D6": "18DAF2D6", "DA": "18DAF1DA",
"DB": "18DAF1DB", "DE": "69C", "DF": "18DAF1DF", "E0": "18DAF1E0", "E1": "18DAF1E1", "E2": "18DAF1E2",
"E3": "18DAF1E3", "E4": "757", "E6": "484", "E7": "7EC", "E8": "5C4", "E9": "762", "EA": "4B3", "EB": "5B8",
"EC": "5B7", "ED": "704", "F7": "736", "F8": "737", "FA": "77B", "FD": "76F", "FE": "76C", "FF": "7D0"
}
dnat = {
"01": "740", "02": "704", "04": "742", "06": "790", "07": "751", "08": "758", "09": "7E3", "0D": "755",
"0E": "74E", "0F": "750", "11": "7C3", "13": "712", "15": "18DA15F1", "16": "18DA71F2", "18": "18DA18F1",
"1A": "711", "1B": "7A4", "1C": "74B", "1E": "748", "23": "753", "24": "75D", "25": "70C", "26": "745",
"27": "74D", "28": "78A", "29": "744", "2A": "74F", "2B": "723", "2C": "752", "2D": "18DA2DF1", "2E": "79C",
"2F": "74C", "32": "756", "3A": "7D6", "40": "707", "41": "18DAD0F1", "46": "7CD", "47": "788", "4D": "79D",
"50": "718", "51": "743", "57": "747", "58": "747", "59": "714", "5B": "785", "60": "18DA60F1", "61": "7B7",
"62": "7DC", "63": "73D", "64": "7D4", "66": "719", "67": "792", "68": "75A", "6B": "795", "6E": "7E1",
"73": "18DA73F2", "77": "7CA", "78": "746", "79": "7E2", "7A": "7E0", "7B": "18DA72F2", "7C": "75C",
"81": "73F", "82": "7AA", "86": "782", "87": "780", "91": "7E5", "93": "79B", "95": "7E4", "97": "7D8",
"A1": "74C", "A5": "705", "A6": "706", "A7": "713", "A8": "796", "C0": "799", "D0": "18DAD0F1", "D1": "7E6",
"D2": "18DAD2F1", "D3": "7E6", "D6": "18DAD6F2", "DA": "18DADAF1", "DB": "18DADBF1", "DE": "6BC",
"DF": "18DADFF1", "E0": "18DAE0F1", "E1": "18DAE1F1", "E2": "18DAE2F1", "E3": "18DAE3F1", "E4": "74F",
"E6": "622", "E7": "7E4", "E8": "644", "E9": "742", "EA": "79A", "EB": "638", "EC": "637", "ED": "714",
"F7": "716", "F8": "717", "FA": "75B", "FD": "74F", "FE": "74C", "FF": "7D0"
}
# Code snippet from https://github.com/rbei-etas/busmaster
negrsp = {"10": "NR: General Reject",
"11": "NR: Service Not Supported",
"12": "NR: SubFunction Not Supported",
"13": "NR: Incorrect Message Length Or Invalid Format",
"21": "NR: Busy Repeat Request",
"22": "NR: Conditions Not Correct Or Request Sequence Error",
"23": "NR: Routine Not Complete",
"24": "NR: Request Sequence Error",
"31": "NR: Request Out Of Range",
"33": "NR: Security Access Denied- Security Access Requested ",
"35": "NR: Invalid Key",
"36": "NR: Exceed Number Of Attempts",
"37": "NR: Required Time Delay Not Expired",
"40": "NR: Download not accepted",
"41": "NR: Improper download type",
"42": "NR: Can not download to specified address",
"43": "NR: Can not download number of bytes requested",
"50": "NR: Upload not accepted",
"51": "NR: Improper upload type",
"52": "NR: Can not upload from specified address",
"53": "NR: Can not upload number of bytes requested",
"70": "NR: Upload Download NotAccepted",
"71": "NR: Transfer Data Suspended",
"72": "NR: General Programming Failure",
"73": "NR: Wrong Block Sequence Counter",
"74": "NR: Illegal Address In Block Transfer",
"75": "NR: Illegal Byte Count In Block Transfer",
"76": "NR: Illegal Block Transfer Type",
"77": "NR: Block Transfer Data Checksum Error",
"78": "NR: Request Correctly Received-Response Pending",
"79": "NR: Incorrect ByteCount During Block Transfer",
"7E": "NR: SubFunction Not Supported In Active Session",
"7F": "NR: Service Not Supported In Active Session",
"80": "NR: Service Not Supported In Active Diagnostic Mode",
"81": "NR: Rpm Too High",
"82": "NR: Rpm Too Low",
"83": "NR: Engine Is Running",
"84": "NR: Engine Is Not Running",
"85": "NR: Engine RunTime TooLow",
"86": "NR: Temperature Too High",
"87": "NR: Temperature Too Low",
"88": "NR: Vehicle Speed Too High",
"89": "NR: Vehicle Speed Too Low",
"8A": "NR: Throttle/Pedal Too High",
"8B": "NR: Throttle/Pedal Too Low",
"8C": "NR: Transmission Range In Neutral",
"8D": "NR: Transmission Range In Gear",
"8F": "NR: Brake Switch(es)NotClosed (brake pedal not pressed or not applied)",
"90": "NR: Shifter Lever Not In Park ",
"91": "NR: Torque Converter Clutch Locked",
"92": "NR: Voltage Too High",
"93": "NR: Voltage Too Low"
}
cmdb = '''
#v1.0 ;AC P; ATZ ; Z ; reset all
#v1.0 ;AC P; ATE1 ; E0, E1 ; Echo off, or on*
#v1.0 ;AC P; ATL0 ; L0, L1 ; Linefeeds off, or on
#v1.0 ;AC ; ATI ; I ; print the version ID
#v1.0 ;AC ; AT@1 ; @1 ; display the device description
#v1.0 ;AC P; ATAL ; AL ; Allow Long (>7 byte) messages
#v1.0 ;AC ; ATBD ; BD ; perform a Buffer Dump
#V1.0 ;ACH ; ATSP4 ; SP h ; Set Protocol to h and save it
#v1.0 ;AC ; ATBI ; BI ; Bypass the Initialization sequence
#v1.0 ;AC P; ATCAF0 ; CAF0, CAF1 ; Automatic Formatting off, or on*
#v1.0 ;AC ; ATCFC1 ; CFC0, CFC1 ; Flow Controls off, or on*
#v1.0 ;AC ; ATCP 01 ; CP hh ; set CAN Priority to hh (29 bit)
#v1.0 ;AC ; ATCS ; CS ; show the CAN Status counts
#v1.0 ;AC ; ATCV 1250 ; CV dddd ; Calibrate the Voltage to dd.dd volts
#v1.0 ;AC ; ATD ; D ; set all to Defaults
#v1.0 ;AC ; ATDP ; DP ; Describe the current Protocol
#v1.0 ;AC ; ATDPN ; DPN ; Describe the Protocol by Number
#v1.0 ;AC P; ATH0 ; H0, H1 ; Headers off*, or on
#v1.0 ;AC ; ATI ; I ; print the version ID
#v1.0 ;AC P; ATIB 10 ; IB 10 ; set the ISO Baud rate to 10400*
#v1.0 ;AC ; ATIB 96 ; IB 96 ; set the ISO Baud rate to 9600
#v1.0 ;AC ; ATL1 ; L0, L1 ; Linefeeds off, or on
#v1.0 ;AC ; ATM0 ; M0, M1 ; Memory off, or on
#v1.0 ; C ; ATMA ; MA ; Monitor All
#v1.0 ; C ; ATMR 01 ; MR hh ; Monitor for Receiver = hh
#v1.0 ; C ; ATMT 01 ; MT hh ; Monitor for Transmitter = hh
#v1.0 ;AC ; ATNL ; NL ; Normal Length messages*
#v1.0 ;AC ; ATPC ; PC ; Protocol Close
#v1.0 ;AC ; ATR1 ; R0, R1 ; Responses off, or on*
#v1.0 ;AC ; ATRV ; RV ; Read the input Voltage
#v1.0 ;ACH ; ATSP7 ; SP h ; Set Protocol to h and save it
#v1.0 ;ACH ; ATSH 00000000 ; SH wwxxyyzz ; Set Header to wwxxyyzz
#v1.0 ;AC ; ATSH 001122 ; SH xxyyzz ; Set Header to xxyyzz
#v1.0 ;AC P; ATSH 012 ; SH xyz ; Set Header to xyz
#v1.0 ;AC ; ATSP A6 ; SP Ah ; Set Protocol to Auto, h and save it
#v1.0 ;AC ; ATSP 6 ; SP h ; Set Protocol to h and save it
#v1.0 ;AC ; ATCM 123 ; CM hhh ; set the ID Mask to hhh
#v1.0 ;AC ; ATCM 12345678 ; CM hhhhhhhh ; set the ID Mask to hhhhhhhh
#v1.0 ;AC ; ATCF 123 ; CF hhh ; set the ID Filter to hhh
#v1.0 ;AC ; ATCF 12345678 ; CF hhhhhhhh ; set the ID Filter to hhhhhhhh
#v1.0 ;AC P; ATST FF ; ST hh ; Set Timeout to hh x 4 msec
#v1.0 ;AC P; ATSW 96 ; SW 00 ; Stop sending Wakeup messages
#v1.0 ;AC P; ATSW 34 ; SW hh ; Set Wakeup interval to hh x 20 msec
#v1.0 ;AC ; ATTP A6 ; TP Ah ; Try Protocol h with Auto search
#v1.0 ;AC ; ATTP 6 ; TP h ; Try Protocol h
#v1.0 ;AC P; ATWM 817AF13E ; WM [1 - 6 bytes] ; set the Wakeup Message
#v1.0 ;AC P; ATWS ; WS ; Warm Start (quick software reset)
#v1.1 ;AC P; ATFC SD 300000 ; FC SD [1 - 5 bytes]; FC, Set Data to [...]
#v1.1 ;AC P; ATFC SH 012 ; FC SH hhh ; FC, Set the Header to hhh
#v1.1 ;AC P; ATFC SH 00112233 ; FC SH hhhhhhhh ; Set the Header to hhhhhhhh
#v1.1 ;AC P; ATFC SM 1 ; FC SM h ; Flow Control, Set the Mode to h
#v1.1 ;AC ; ATPP FF OFF ; PP FF OFF ; all Prog Parameters disabled
#v1.1 ;AC ; ATPP FF ON ; PP FF ON ; all Prog Parameters enabled
#v1.1 ; ; ; PP xx OFF ; disable Prog Parameter xx
#v1.1 ; ; ; PP xx ON ; enable Prog Parameter xx
#v1.1 ; ; ; PP xx SV yy ; for PP xx, Set the Value to yy
#v1.1 ;AC ; ATPPS ; PPS ; print a PP Summary
#v1.2 ;AC ; ATAR ; AR ; Automatically Receive
#v1.2 ;AC 0; ATAT1 ; AT0, 1, 2 ; Adaptive Timing off, auto1*, auto2
#v1.2 ; ; ; BRD hh ; try Baud Rate Divisor hh
#v1.2 ; ; ; BRT hh ; set Baud Rate Timeout
#v1.2 ;ACH ; ATSPA ; SP h ; Set Protocol to h and save it
#v1.2 ; C ; ATDM1 ; DM1 ; monitor for DM1 messages
#v1.2 ; C ; ATIFR H ; IFR H, S ; IFR value from Header* or Source
#v1.2 ; C ; ATIFR0 ; IFR0, 1, 2 ; IFRs off, auto*, or on
#v1.2 ;AC ; ATIIA 01 ; IIA hh ; set ISO (slow) Init Address to hh
#v1.2 ;AC ; ATKW0 ; KW0, KW1 ; Key Word checking off, or on*
#v1.2 ; C ; ATMP 0123 ; MP hhhh ; Monitor for PGN 0hhhh
#v1.2 ; C ; ATMP 0123 4 ; MP hhhh n ; and get n messages
#v1.2 ; C ; ATMP 012345 ; MP hhhhhh ; Monitor for PGN hhhhhh
#v1.2 ; C ; ATMP 012345 6 ; MP hhhhhh n ; and get n messages
#v1.2 ;AC ; ATSR 01 ; SR hh ; Set the Receive address to hh
#v1.3 ; ; AT@2 ; @2 ; display the device identifier
#v1.3 ;AC P; ATCRA 012 ; CRA hhh ; set CAN Receive Address to hhh
#v1.3 ;AC ; ATCRA 01234567 ; CRA hhhhhhhh ; set the Rx Address to hhhhhhhh
#v1.3 ;AC ; ATD0 ; D0, D1 ; display of the DLC off*, or on
#v1.3 ;AC ; ATFE ; FE ; Forget Events
#v1.3 ;AC ; ATJE ; JE ; use J1939 Elm data format*
#v1.3 ;AC ; ATJS ; JS ; use J1939 SAE data format
#v1.3 ;AC ; ATKW ; KW ; display the Key Words
#v1.3 ;AC ; ATRA 01 ; RA hh ; set the Receive Address to hh
#v1.3 ;ACH ; ATSP6 ; SP h ; Set Protocol to h and save it
#v1.3 ;ACH ; ATRTR ; RTR ; send an RTR message
#v1.3 ;AC ; ATS1 ; S0, S1 ; printing of aces off, or on*
#v1.3 ;AC ; ATSP 00 ; SP 00 ; Erase stored protocol
#v1.3 ;AC ; ATV0 ; V0, V1 ; use of Variable DLC off*, or on
#v1.4 ;AC ; ATCEA ; CEA ; turn off CAN Extended Addressing
#v1.4 ;AC ; ATCEA 01 ; CEA hh ; use CAN Extended Address hh
#v1.4 ;AC ; ATCV 0000 ; CV 0000 ; restore CV value to factory setting
#v1.4 ;AC ; ATIB 48 ; IB 48 ; set the ISO Baud rate to 4800
#v1.4 ;AC ; ATIGN ; IGN ; read the IgnMon input level
#v1.4 ; ; ; LP ; go to Low Power mode
#v1.4 ;AC ; ATPB 01 23 ; PB xx yy ; Protocol B options and baud rate
#v1.4 ;AC ; ATRD ; RD ; Read the stored Data
#v1.4 ;AC ; ATSD 01 ; SD hh ; Save Data byte hh
#v1.4 ;ACH ; ATSP4 ; SP h ; Set Protocol to h and save it
#v1.4 ;AC P; ATSI ; SI ; perform a Slow (5 baud) Initiation
#v1.4 ;ACH ; ATZ ; Z ; reset all
#v1.4 ;ACH ; ATSP5 ; SP h ; Set Protocol to h and save it
#v1.4 ;AC P; ATFI ; FI ; perform a Fast Initiation
#v1.4 ;ACH ; ATZ ; Z ; reset all
#v1.4 ;AC ; ATSS ; SS ; use Standard Search order (J1978)
#v1.4 ;AC ; ATTA 12 ; TA hh ; set Tester Address to hh
#v1.4 ;ACH ; ATSPA ; SP h ; Set Protocol to h and save it
#v1.4 ;AC ; ATCSM1 ; CSM0, CSM1 ; Silent Monitoring off, or on*
#v1.4 ;AC ; ATJHF1 ; JHF0, JHF1 ; Header Formatting off, or on*
#v1.4 ;AC ; ATJTM1 ; JTM1 ; set Timer Multiplier to 1*
#v1.4 ;AC ; ATJTM5 ; JTM5 ; set Timer Multiplier to 5
#v1.4b;AC ; ATCRA ; CRA ; reset the Receive Address filters
#v2.0 ;AC ; ATAMC ; AMC ; display Activity Monitor Count
#v2.0 ;AC ; ATAMT 20 ; AMT hh ; set the Activity Mon Timeout to hh
#v2.1 ;AC ; ATCTM1 ; CTM1 ; set Timer Multiplier to 1*
#v2.1 ;AC ; ATCTM5 ; CTM5 ; set Timer Multiplier to 5
#v2.1 ;ACH ; ATZ ; Z ; reset all
'''
def get_can_addr(txa):
for d in dnat.keys():
if dnat[d].upper() == txa.upper():
return d
return None
def getcandnat(addr):
a = str(addr).upper()
if a in dnat:
return dnat[a]
return "??"
def getcansnat(addr):
a = str(addr).upper()
if a in snat:
return snat[a]
return "??"
def item_count(iter):
return sum(1 for _ in iter)
def get_available_ports():
ports = []
portlist = list_ports.comports()
if item_count(portlist) == 0:
return
iterator = sorted(list(portlist))
for port, desc, hwid in iterator:
ports.append((port, desc))
return ports
def reconnect_elm():
ports = get_available_ports()
current_adapter = "STD"
if options.elm:
current_adapter = options.elm.adapter_type
for port, desc in ports:
if desc == options.port_name:
options.elm = ELM(port, options.port_speed, current_adapter)
return True
return False
def errorval(val):
if val not in negrsp:
return "Unregistered error"
if val in negrsp.keys():
return negrsp[val]
class Port:
'''This is a serial port or a TCP-connection
if portName looks like a 192.168.0.10:35000
then it is wifi and we should open tcp connection
else try to open serial port
'''
connectionStatus = False
portType = 0 # 0-serial 1-tcp
ipaddr = '192.168.0.10'
tcpprt = 35000
portName = ""
portTimeout = 5 # don't change it here. Change in ELM class
droid = None
btcid = None
hdr = None
tcp_needs_reconnect = False
def __init__(self, portName, speed, portTimeout):
options.elm_failed = False
self.portTimeout = portTimeout
portName = portName.strip()
if re.match(r"^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\:\d{1,5}$", portName):
import socket
self.ipaddr, self.tcpprt = portName.split(':')
self.tcpprt = int(self.tcpprt)
self.portType = 1
self.init_wifi()
else:
self.portName = portName
self.portType = 0
try:
self.hdr = serial.Serial(self.portName, baudrate=speed, timeout=portTimeout,
parity=serial.PARITY_NONE, stopbits=serial.STOPBITS_ONE)
print(self.hdr)
self.connectionStatus = True
return
except Exception as e:
print(_("Error:") + str(e))
print(_("ELM not connected or wrong COM port"), portName)
options.last_error = _("Error:") + str(e)
options.elm_failed = True
def close(self):
try:
self.hdr.close()
print("Port closed")
except:
pass
def init_wifi(self, reinit=False):
'''
Needed for wifi adapters with short connection timeout
'''
if self.portType != 1:
return
import socket
if reinit:
self.hdr.close()
self.hdr = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self.hdr.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)
try:
self.hdr.connect((self.ipaddr, self.tcpprt))
self.hdr.setblocking(True)
self.connectionStatus = True
except:
options.elm_failed = True
def read_byte(self):
try:
byte = b""
if self.portType == 1:
import socket
try:
byte = self.hdr.recv(1)
print(str(byte))
except socket.timeout:
self.tcp_needs_reconnect = True
except Exception as e:
print(e)
elif self.portType == 2:
if self.droid.bluetoothReadReady():
byte = self.droid.bluetoothRead(1).result
else:
if self.hdr.inWaiting():
byte = self.hdr.read()
except:
print('*' * 40)
print('* ' + _('Connection to ELM was lost'))
self.connectionStatus = False
self.close()
return None
return byte
def read(self):
try:
byte = b""
if self.portType == 1:
import socket
try:
byte = self.hdr.recv(1)
print(str(byte))
except socket.timeout:
self.tcp_needs_reconnect = True
except Exception as e:
print(e)
elif self.portType == 2:
if self.droid.bluetoothReadReady():
byte = self.droid.bluetoothRead(1).result
else:
if self.hdr.inWaiting():
byte = self.hdr.read()
except:
print('*' * 40)
print('* ' + _('Connection to ELM was lost'))
self.connectionStatus = False
self.close()
return None
try:
return byte.decode("utf-8")
except:
print("Cannot decode bytes " + str(byte))
return ""
def change_rate(self, rate):
self.hdr.baudrate = rate
def write(self, data):
try:
if self.portType == 1:
if self.tcp_needs_reconnect:
self.tcp_needs_reconnect = False
self.init_wifi(True)
return self.hdr.sendall(data)
elif self.portType == 2:
return self.droid.bluetoothWrite(data)
else:
return self.hdr.write(data)
except:
print('*' * 40)
print('* ' + _('Connection to ELM was lost'))
self.connectionStatus = False
self.close()
def expect_carriage_return(self, time_out=1):
tb = time.time() # start time
self.buff = b""
while True:
if not options.simulation_mode:
byte = self.read_byte()
else:
byte = '>'
if byte:
self.buff += byte
tc = time.time()
if b'\r' in self.buff:
return self.buff.decode('utf8')
if (tc - tb) > time_out:
return self.buff + b"TIMEOUT"
self.close()
self.connectionStatus = False
return ''
def expect(self, pattern, time_out=1):
tb = time.time() # start time
self.buff = ""
while True:
if not options.simulation_mode:
byte = self.read()
else:
byte = '>'
if byte == '\r':
byte = '\n'
if byte:
self.buff += byte
tc = time.time()
if pattern in self.buff:
return self.buff
if (tc - tb) > time_out:
return self.buff + _("TIMEOUT")
self.close()
self.connectionStatus = False
return ''
def check_elm(self):
self.hdr.timeout = 2
for s in [38400, 115200, 230400, 57600, 9600, 500000]:
print("\r\t\t\t\t\r" + _("Checking port speed:"), s, )
sys.stdout.flush()
self.hdr.baudrate = s
self.hdr.flushInput()
self.write("\r")
# search > string
tb = time.time() # start time
self.buff = ""
while (True):
if not options.simulation_mode:
byte = self.read()
else:
byte = '>'
self.buff += byte
tc = time.time()
if '>' in self.buff:
options.port_speed = s
print("\n" + _("Start COM speed :"), s)
self.hdr.timeout = self.portTimeout
return True
if (tc - tb) > 1:
break
print("\n" + _("ELM not responding"))
return False
class ELM:
'''ELM327 class'''
port = 0
lf = 0
vf = 0
keepAlive = 4 # send startSession to CAN after silence if startSession defined
busLoad = 0 # I am sure than it should be zero
srvsDelay = 0 # the delay next command requested by service
lastCMDtime = 0 # time when last command was sent to bus
portTimeout = 5 # timeout of port (com or tcp)
elmTimeout = 0 # timeout set by ATST
# error counters
error_frame = 0
error_bufferfull = 0
error_question = 0
error_nodata = 0
error_timeout = 0
error_rx = 0
error_can = 0
canline = 0
response_time = 0
buff = ""
currentprotocol = ""
currentsubprotocol = ""
currentaddress = ""
startSession = ""
lastinitrsp = ""
rsp_cache = {}
l1_cache = {}
ATR1 = True
ATCFC0 = False
portName = ""
lastMessage = ""
monitorstop = False
connectionStatus = False
def __init__(self, portName, rate, adapter_type="STD", maxspeed="No"):
for speed in [int(rate), 38400, 115200, 230400, 57600, 9600, 500000, 1000000, 2000000]:
print(_("Trying to open port ") + "%s @ %i" % (portName, speed))
self.sim_mode = options.simulation_mode
self.portName = portName
self.adapter_type = adapter_type
if not options.simulation_mode:
self.port = Port(portName, speed, self.portTimeout)
if options.elm_failed:
self.connectionStatus = False
return
if not os.path.exists("./logs"):
os.mkdir("./logs")
if len(options.log) > 0:
self.lf = open("./logs/elm_" + options.log, "at")
self.vf = open("./logs/ecu_" + options.log, "at")
self.lastCMDtime = 0
self.ATCFC0 = options.opt_cfc0
# Purge unread data
self.port.expect(">")
res = self.send_raw("ATZ")
if 'ELM' in res or 'OBDII' in res:
options.last_error = ""
options.elm_failed = False
self.connectionStatus = True
rate = speed
break
else:
options.elm_failed = True
options.last_error = _("No ELM interface on port") + " %s" % portName
try:
maxspeed = int(maxspeed)
except:
maxspeed = 0
if adapter_type == "OBDLINK" and maxspeed > 0 and not options.elm_failed and rate != 2000000:
print("OBDLink Connection OK, attempting full speed UART switch")
try:
self.raise_odb_speed(maxspeed)
except:
options.elm_failed = True
self.connectionStatus = False
print("Failed to switch to change OBDLink to " + str(maxspeed))
elif adapter_type == "STD_USB" and rate != 115200 and maxspeed > 0:
print("ELM Connection OK, attempting high speed UART switch")
try:
self.raise_elm_speed(maxspeed)
except:
options.elm_failed = True
self.connectionStatus = False
print("Failed to switch to change ELM to " + str(maxspeed))
def raise_odb_speed(self, baudrate):
# Software speed switch
res = self.port.write(("ST SBR " + str(baudrate) + "\r").encode('utf8'))
# Command echo
res = self.port.expect_carriage_return()
# Command result
res = self.port.expect_carriage_return()
if "OK" in res:
print("OBDLINK switched baurate OK, changing UART speed now...")
self.port.change_rate(baudrate)
time.sleep(0.5)
res = self.send_raw("STI").replace("\n", "").replace(">", "").replace("STI", "")
if "STN" in res:
print("OBDLink full speed connection OK")
print("OBDLink Version " + res)
else:
raise
else:
raise
def raise_elm_speed(self, baudrate):
# Software speed switch to 115Kbps
if baudrate == 57600:
res = self.port.write("ATBRD 45\r".encode("utf8"))
elif baudrate == 115200:
res = self.port.write("ATBRD 23\r".encode("utf8"))
elif baudrate == 230400:
res = self.port.write("ATBRD 11\r".encode("utf8"))
elif baudrate == 500000:
res = self.port.write("ATBRD 8\r".encode("utf8"))
else:
return
# Command echo
res = self.port.expect_carriage_return()
# Command result
res = self.port.expect_carriage_return()
if "OK" in res:
print("ELM baudrate switched OK, changing UART speed now...")
self.port.change_rate(baudrate)
version = self.port.expect_carriage_return()
if "ELM327" in version:
self.port.write('\r'.encode('utf8'))
res = self.port.expect('>')
if "OK" in res:
print("ELM full speed connection OK ")
print("Version " + version)
else:
raise
else:
raise
else:
print("Your ELM does not support baudrate " + str(baudrate))
raise
def __del__(self):
try:
print("ELM reset...")
self.port.write("ATZ\r".encode("utf8"))
except:
pass
def connectionStat(self):
return self.port.connectionStatus
def clear_cache(self):
''' Clear L2 cache before screen update
'''
self.rsp_cache = {}
def request(self, req, positive='', cache=True, serviceDelay="0"):
''' Check if request is saved in L2 cache.
If not then
- make real request
- convert responce to one line
- save in L2 cache
returns response without consistency check
'''
if cache and req in self.rsp_cache.keys():
return self.rsp_cache[req]
# send cmd
rsp = self.cmd(req, serviceDelay)
if 'WRONG' in rsp:
return rsp
res = ""
if self.currentprotocol != "can":
# Trivially reject first line (echo)
rsp_split = rsp.split('\n')[1:]
for s in rsp_split:
if '>' not in s:
res += s.strip() + ' '
else:
# parse response
for s in rsp.split('\n'):
if ':' in s:
res += s[2:].strip() + ' '
else: # response consists only of one frame
if s.replace(' ', '').startswith(positive.replace(' ', '')):
res += s.strip() + ' '
rsp = res
# populate L2 cache
self.rsp_cache[req] = rsp
# save log
if self.vf != 0:
tmstr = datetime.now().strftime("%H:%M:%S.%f")[:-3]
if self.currentaddress in dnat:
self.vf.write(tmstr + ";" + dnat[self.currentaddress] + ";" + req + ";" + rsp + "\n")
else:
print("Unknown address ", self.currentaddress, req, rsp)
self.vf.flush()
return rsp
def errorval(self, val):
if val not in negrsp:
return "not registered error"
if val in negrsp.keys():
return negrsp[val]
def cmd(self, command, serviceDelay="0"):
tb = time.time() # start time
# Ensure time gap between commands
dl = self.busLoad + self.srvsDelay - tb + self.lastCMDtime
if ((tb - self.lastCMDtime) < (self.busLoad + self.srvsDelay)) \
and ("AT" not in command.upper() or "ST" not in command.upper()):
time.sleep(self.busLoad + self.srvsDelay - tb + self.lastCMDtime)
tb = time.time() # renew start time
# If we use wifi and there was more than keepAlive seconds of silence then reinit tcp
if (tb - self.lastCMDtime) > self.keepAlive:
self.port.init_wifi(True)
# If we are on CAN and there was more than keepAlive seconds of silence and
# start_session_can was executed then send startSession command again
# if ((tb-self.lastCMDtime)>self.keepAlive and self.currentprotocol=="can"
if ((tb - self.lastCMDtime) > self.keepAlive
and self.currentprotocol == "can"
and len(self.startSession) > 0):
# log KeepAlive event
if self.lf != 0:
tmstr = datetime.now().strftime("%H:%M:%S.%f")[:-3]
self.lf.write("#[" + tmstr + "]" + "KeepAlive\n")
self.lf.flush()
# send keepalive
self.send_cmd(self.startSession)
self.lastCMDtime = time.time() # for not to get into infinite loop
# send command
cmdrsp = self.send_cmd(command)
self.lastCMDtime = tc = time.time()
# add srvsDelay to time gap before send next command
self.srvsDelay = float(serviceDelay) / 1000.
# check for negative response
for l in cmdrsp.split('\n'):
l = l.strip().upper()
if l.startswith("7F") and len(l) == 8 and l[6:8] in negrsp.keys():
print(l, negrsp[l[6:8]])
if self.lf != 0:
self.lf.write("#[" + str(tc - tb) + "] rsp:" + l + ":" + negrsp[l[6:8]] + "\n")
self.lf.flush()
return cmdrsp
def set_can_timeout(self, value):
val = value // 4
if val > 255:
val = 255
val = hex(val)[2:].upper()
self.cmd("AT ST %s" % val)
def send_cmd(self, command):
if "AT" in command.upper() or "ST" in command.upper() or self.currentprotocol != "can":
return self.send_raw(command)
if self.ATCFC0:
return self.send_can_cfc0(command)
else:
rsp = self.send_can(command)
return rsp
def send_can(self, command):
command = command.strip().replace(' ', '')
if len(command) % 2 != 0 or len(command) == 0:
return "ODD ERROR"
if not all(c in string.hexdigits for c in command):
return "HEX ERROR"
# do framing
raw_command = []
cmd_len = int(len(command) / 2)
if cmd_len < 8: # single frame
# check L1 cache here
if command in self.l1_cache.keys():
raw_command.append(("%0.2X" % cmd_len) + command + self.l1_cache[command])
else:
raw_command.append(("%0.2X" % cmd_len) + command)
else:
# first frame
raw_command.append("1" + ("%0.3X" % cmd_len)[-3:] + command[:12])
command = command[12:]
# consecutive frames
frame_number = 1
while (len(command)):
raw_command.append("2" + ("%X" % frame_number)[-1:] + command[:14])
frame_number = frame_number + 1
command = command[14:]
responses = []
# send frames
for f in raw_command:
# send next frame
frsp = self.send_raw(f)
# analyse response (1 phase)
for s in frsp.split('\n'):
if s.strip() == f: # echo cancellation
continue
s = s.strip().replace(' ', '')
if len(s) == 0: # empty string
continue
if all(c in string.hexdigits for c in s): # some data
if s[:1] == '3': # flow control, just ignore it in this version
continue
responses.append(s)
# analyse response (2 phases)
result = ""
noerrors = True
cframe = 0 # frame counter
nbytes = 0 # number bytes in response
nframes = 0
if len(responses) == 0: # no data in response
return ""
if len(responses) > 1 and responses[0].startswith('037F') and responses[0][6:8] == '78':
responses = responses[1:]
if len(responses) == 1: # single frame response
if responses[0][:1] == '0':
nbytes = int(responses[0][1:2], 16)
nframes = 1
result = responses[0][2:2 + nbytes * 2]
else: # wrong response (not all frames received)
self.error_frame += 1
noerrors = False
else: # multi frame response
if responses[0][:1] == '1': # first frame
nbytes = int(responses[0][1:4], 16)
nframes = nbytes / 7 + 1
cframe = 1
result = responses[0][4:16]
else: # wrong response (first frame omitted)
self.error_frame += 1
noerrors = False
for fr in responses[1:]:
if fr[:1] == '2': # consecutive frames
tmp_fn = int(fr[1:2], 16)
if tmp_fn != (cframe % 16): # wrong response (frame lost)
self.error_frame += 1
noerrors = False
continue
cframe += 1
result += fr[2:16]
else: # wrong response
self.error_frame += 1
noerrors = False
errorstr = "Unknown"
# check for negative response (repeat the same as in cmd())
if result[:2] == '7F':
noerrors = False
if result[4:6] in negrsp.keys():
errorstr = negrsp[result[4:6]]
if self.vf != 0:
tmstr = datetime.now().strftime("%H:%M:%S.%f")[:-3]
self.vf.write(
tmstr + ";" + dnat[self.currentaddress] + ";" + command + ";" + result + ";" + errorstr + "\n")
self.vf.flush()
# populate L1 cache
if noerrors and nframes < 16 and command[:1] == '2' and not options.opt_n1c:
self.l1_cache[command] = str(nframes)
if len(result) / 2 >= nbytes and noerrors:
# Remove unnecessary bytes
result = result[0:nbytes * 2]
# split by bytes and return
result = ' '.join(a + b for a, b in zip(result[::2], result[1::2]))
return result
else:
return "WRONG RESPONSE : " + errorstr + "(" + result + ")"
def send_can_cfc0(self, command):
command = command.strip().replace(' ', '')
if len(command) % 2 != 0 or len(command) == 0:
return "ODD ERROR"
if not all(c in string.hexdigits for c in command):
return "HEX ERROR"
# do framing
raw_command = []
cmd_len = int(len(command) / 2)
if cmd_len < 8: # single frame
raw_command.append(("%0.2X" % cmd_len) + command)
else:
# first frame
raw_command.append("1" + ("%0.3X" % cmd_len)[-3:] + command[:12])
command = command[12:]
# consecutive frames
frame_number = 1
while len(command):
raw_command.append("2" + ("%X" % frame_number)[-1:] + command[:14])
frame_number += 1
command = command[14:]
responses = []
# send frames
BS = 1 # Burst Size
ST = 0 # Frame Interval
Fc = 0 # Current frame
Fn = len(raw_command) # Number of frames
if Fn > 1 or len(raw_command[0]) > 15:
# set elm timeout to 300ms for first response
self.send_raw('AT ST 4B')
while Fc < Fn:
# enable responses
if not self.ATR1:
frsp = self.send_raw('AT R1')
self.ATR1 = True
tb = time.time() # time of sending (ff)
if Fn > 1 and Fc == (Fn - 1): # set elm timeout to maximum for last response on long command
self.send_raw('AT ST FF')
self.send_raw('AT AT 1')
if (Fc == 0 or Fc == (Fn - 1)) and len(
raw_command[Fc]) < 16: # first or last frame in command and len<16 (bug in ELM)
frsp = self.send_raw(raw_command[Fc] + '1') # we'll get only 1 frame: nr, fc, ff or sf
else:
frsp = self.send_raw(raw_command[Fc])
Fc = Fc + 1
# analyse response
for s in frsp.split('\n'):
if s.strip()[:len(raw_command[Fc - 1])] == raw_command[Fc - 1]: # echo cancelation
continue
s = s.strip().replace(' ', '')
if len(s) == 0: # empty string
continue
if all(c in string.hexdigits for c in s): # some data
if s[:1] == '3': # FlowControl
# extract Burst Size
BS = s[2:4]
BS = int(BS, 16)
# extract Frame Interval