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326 lines
12 KiB
326 lines
12 KiB
7 years ago
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#!/usr/bin/env python
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"""Used to Reverse/Test ELM protocol auto detect and OBD message response without a car."""
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from __future__ import print_function
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import sys
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import os
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import struct
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import binascii
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import time
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import threading
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from collections import deque
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sys.path.append(os.path.join(os.path.dirname(os.path.realpath(__file__)), ".."))
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from panda import Panda
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def lin_checksum(dat):
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return sum(dat) % 0x100
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class ELMCarSimulator():
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def __init__(self, sn, silent=False, can_kbaud=500,
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can=True, can11b=True, can29b=True,
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lin=True):
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self.__p = Panda(sn if sn else Panda.list()[0])
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self.__on = True
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self.__stop = False
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self.__silent = silent
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self.__lin_timer = None
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self.__lin_active = False
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self.__lin_enable = lin
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self.__lin_monitor_thread = threading.Thread(target=self.__lin_monitor)
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self.__can_multipart_data = None
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self.__can_kbaud = can_kbaud
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self.__can_extra_noise_msgs = deque()
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self.__can_enable = can
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self.__can11b = can11b
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self.__can29b = can29b
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self.__can_monitor_thread = threading.Thread(target=self.__can_monitor)
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@property
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def panda(self):
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return self.__p
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def stop(self):
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if self.__lin_timer:
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self.__lin_timer.cancel()
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self.__lin_timeout_handler()
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self.__stop = True
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def join(self):
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if self.__lin_monitor_thread.is_alive():
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self.__lin_monitor_thread.join()
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if self.__can_monitor_thread.is_alive():
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self.__can_monitor_thread.join()
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if self.__p:
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print("closing handle")
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self.__p.close()
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def set_enable(self, on):
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self.__on = on
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def start(self):
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self.panda.set_safety_mode(Panda.SAFETY_ALLOUTPUT)
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if self.__lin_enable:
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self.__lin_monitor_thread.start()
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if self.__can_enable:
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self.__can_monitor_thread.start()
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#########################
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# LIN related functions #
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#########################
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def __lin_monitor(self):
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print("STARTING LIN THREAD")
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self.panda.set_uart_baud(2, 10400)
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self.panda.kline_drain() # Toss whatever was already there
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lin_buff = bytearray()
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while not self.__stop:
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lin_msg = self.panda.serial_read(2)
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if not lin_msg:
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continue
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lin_buff += lin_msg
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#print(" ** Buff", lin_buff)
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if lin_buff.endswith(b'\x00\xc1\x33\xf1\x81\x66'): # Leading 0 is wakeup
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lin_buff = bytearray()
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self.__lin_active = True
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print("GOT LIN (KWP FAST) WAKEUP SIGNAL")
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self._lin_send(0x10, b'\xC1\x8F\xE9')
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self.__reset_lin_timeout()
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continue
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if self.__lin_active:
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msglen = lin_buff[0] & 0x7
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if lin_buff[0] & 0xF8 not in (0x80, 0xC0):
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print("Invalid bytes at start of message")
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print(" BUFF", lin_buff)
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continue
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if len(lin_buff) < msglen + 4: continue
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if lin_checksum(lin_buff[:-1]) != lin_buff[-1]: continue
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self.__lin_process_msg(lin_buff[0] & 0xF8, #Priority
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lin_buff[1], lin_buff[2], lin_buff[3:-1])
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lin_buff = bytearray()
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def _lin_send(self, to_addr, msg):
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if not self.__silent:
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print(" LIN Reply (%x)" % to_addr, binascii.hexlify(msg))
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PHYS_ADDR = 0x80
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FUNC_ADDR = 0xC0
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RECV = 0xF1
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SEND = 0x33 # Car OBD Functional Address
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headers = struct.pack("BBB", PHYS_ADDR | len(msg), RECV, to_addr)
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if not self.__silent:
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print(" Sending LIN", binascii.hexlify(headers+msg),
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hex(sum(bytearray(headers+msg))%0x100))
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self.panda.kline_send(headers + msg)
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def __reset_lin_timeout(self):
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if self.__lin_timer:
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self.__lin_timer.cancel()
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self.__lin_timer = threading.Timer(5, self.__lin_timeout_handler)
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self.__lin_timer.start()
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def __lin_timeout_handler(self):
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print("LIN TIMEOUT")
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self.__lin_timer = None
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self.__lin_active = False
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@property
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def lin_active(self):
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return self.__lin_active
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def __lin_process_msg(self, priority, toaddr, fromaddr, data):
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self.__reset_lin_timeout()
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if not self.__silent and data != b'\x3E':
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print("LIN MSG", "Addr:", hex(toaddr), "obdLen:", len(data),
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binascii.hexlify(data))
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outmsg = None
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#if data == b'\x3E':
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# print("KEEP ALIVE")
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#el
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if len(data) > 1:
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outmsg = self._process_obd(data[0], data[1])
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if outmsg:
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obd_header = struct.pack("BB", 0x40 | data[0], data[1])
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if len(outmsg) <= 5:
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self._lin_send(0x10, obd_header + outmsg)
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else:
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first_msg_len = min(4, len(outmsg)%4) or 4
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self._lin_send(0x10, obd_header + b'\x01' +
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b'\x00'*(4-first_msg_len) +
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outmsg[:first_msg_len])
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for num, i in enumerate(range(first_msg_len, len(outmsg), 4)):
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self._lin_send(0x10, obd_header +
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struct.pack('B', (num+2)%0x100) + outmsg[i:i+4])
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#########################
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# CAN related functions #
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#########################
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def __can_monitor(self):
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print("STARTING CAN THREAD")
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self.panda.set_can_speed_kbps(0, self.__can_kbaud)
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self.panda.can_recv() # Toss whatever was already there
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while not self.__stop:
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for address, ts, data, src in self.panda.can_recv():
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if self.__on and src is 0 and len(data) == 8 and data[0] >= 2:
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if not self.__silent:
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print("Processing CAN message", src, hex(address), binascii.hexlify(data))
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self.__can_process_msg(data[1], data[2], address, ts, data, src)
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elif not self.__silent:
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print("Rejecting CAN message", src, hex(address), binascii.hexlify(data))
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def can_mode_11b(self):
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self.__can11b = True
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self.__can29b = False
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def can_mode_29b(self):
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self.__can11b = False
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self.__can29b = True
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def can_mode_11b_29b(self):
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self.__can11b = True
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self.__can29b = True
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def change_can_baud(self, kbaud):
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self.__can_kbaud = kbaud
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self.panda.set_can_speed_kbps(0, self.__can_kbaud)
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def can_add_extra_noise(self, noise_msg, addr=None):
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self.__can_extra_noise_msgs.append((addr, noise_msg))
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def _can_send(self, addr, msg):
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if not self.__silent:
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print(" CAN Reply (%x)" % addr, binascii.hexlify(msg))
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self.panda.can_send(addr, msg + b'\x00'*(8-len(msg)), 0)
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if self.__can_extra_noise_msgs:
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noise = self.__can_extra_noise_msgs.popleft()
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self.panda.can_send(noise[0] if noise[0] is not None else addr,
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noise[1] + b'\x00'*(8-len(noise[1])), 0)
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def _can_addr_matches(self, addr):
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if self.__can11b and (addr == 0x7DF or (addr & 0x7F8) == 0x7E0):
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return True
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if self.__can29b and (addr == 0x18db33f1 or (addr & 0x1FFF00FF) == 0x18da00f1):
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return True
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return False
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def __can_process_msg(self, mode, pid, address, ts, data, src):
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if not self.__silent:
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print("CAN MSG", binascii.hexlify(data[1:1+data[0]]),
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"Addr:", hex(address), "Mode:", hex(mode)[2:].zfill(2),
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"PID:", hex(pid)[2:].zfill(2), "canLen:", len(data),
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binascii.hexlify(data))
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if self._can_addr_matches(address) and len(data) == 8:
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outmsg = None
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if data[:3] == b'\x30\x00\x00' and len(self.__can_multipart_data):
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if not self.__silent:
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print("Request for more data");
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outaddr = 0x7E8 if address == 0x7DF or address == 0x7E0 else 0x18DAF110
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msgnum = 1
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while(self.__can_multipart_data):
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datalen = min(7, len(self.__can_multipart_data))
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msgpiece = struct.pack("B", 0x20 | msgnum) + self.__can_multipart_data[:datalen]
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self._can_send(outaddr, msgpiece)
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self.__can_multipart_data = self.__can_multipart_data[7:]
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msgnum = (msgnum+1)%0x10
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time.sleep(0.01)
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else:
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outmsg = self._process_obd(mode, pid)
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if outmsg:
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outaddr = 0x7E8 if address == 0x7DF or address == 0x7E0 else 0x18DAF110
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if len(outmsg) <= 5:
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self._can_send(outaddr,
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struct.pack("BBB", len(outmsg)+2, 0x40|data[1], pid) + outmsg)
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else:
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first_msg_len = min(3, len(outmsg)%7)
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payload_len = len(outmsg)+3
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msgpiece = struct.pack("BBBBB", 0x10 | ((payload_len>>8)&0xF),
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payload_len&0xFF,
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0x40|data[1], pid, 1) + outmsg[:first_msg_len]
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self._can_send(outaddr, msgpiece)
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self.__can_multipart_data = outmsg[first_msg_len:]
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#########################
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# General OBD functions #
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#########################
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def _process_obd(self, mode, pid):
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if mode == 0x01: # Mode: Show current data
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if pid == 0x00: #List supported things
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return b"\xff\xff\xff\xfe"#b"\xBE\x1F\xB8\x10" #Bitfield, random features
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elif pid == 0x01: # Monitor Status since DTC cleared
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return b"\x00\x00\x00\x00" #Bitfield, random features
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elif pid == 0x04: # Calculated engine load
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return b"\x2f"
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elif pid == 0x05: # Engine coolant temperature
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return b"\x3c"
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elif pid == 0x0B: # Intake manifold absolute pressure
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return b"\x90"
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elif pid == 0x0C: # Engine RPM
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return b"\x1A\xF8"
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elif pid == 0x0D: # Vehicle Speed
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return b"\x53"
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elif pid == 0x10: # MAF air flow rate
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return b"\x01\xA0"
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elif pid == 0x11: # Throttle Position
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return b"\x90"
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elif pid == 0x33: # Absolute Barometric Pressure
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return b"\x90"
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elif mode == 0x09: # Mode: Request vehicle information
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if pid == 0x02: # Show VIN
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return b"1D4GP00R55B123456"
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if pid == 0xFC: # test long multi message. Ligned up for LIN responses
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return b''.join((struct.pack(">BBH", 0xAA, 0xAA, num+1) for num in range(80)))
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if pid == 0xFD: # test long multi message
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parts = (b'\xAA\xAA\xAA' + struct.pack(">I", num) for num in range(80))
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return b'\xAA\xAA\xAA' + b''.join(parts)
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if pid == 0xFE: # test very long multi message
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parts = (b'\xAA\xAA\xAA' + struct.pack(">I", num) for num in range(584))
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return b'\xAA\xAA\xAA' + b''.join(parts) + b'\xAA'
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if pid == 0xFF:
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return b'\xAA\x00\x00' +\
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b"".join(((b'\xAA'*5)+struct.pack(">H", num+1) for num in range(584)))
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#return b"\xAA"*100#(0xFFF-3)
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if __name__ == "__main__":
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serial = os.getenv("SERIAL") if os.getenv("SERIAL") else None
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kbaud = int(os.getenv("CANKBAUD")) if os.getenv("CANKBAUD") else 500
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bitwidth = int(os.getenv("CANBITWIDTH")) if os.getenv("CANBITWIDTH") else 0
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canenable = bool(int(os.getenv("CANENABLE"))) if os.getenv("CANENABLE") else True
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linenable = bool(int(os.getenv("LINENABLE"))) if os.getenv("LINENABLE") else True
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sim = ELMCarSimulator(serial, can_kbaud=kbaud, can=canenable, lin=linenable)
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if(bitwidth == 0):
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sim.can_mode_11b_29b()
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if(bitwidth == 11):
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sim.can_mode_11b()
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if(bitwidth == 29):
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sim.can_mode_29b()
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import signal
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def signal_handler(signal, frame):
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print('\nShutting down simulator')
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sim.stop()
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sim.join()
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sys.exit(0)
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signal.signal(signal.SIGINT, signal_handler)
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sim.start()
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signal.pause()
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