#!/usr/bin/env python3
import unittest
import panda.tests.safety.common as common
from panda import DLC_TO_LEN, Panda
from panda.tests.libpanda import libpanda_py
from panda.tests.safety.test_defaults import TestDefaultRxHookBase
GM_CAMERA_DIAG_ADDR = 0x24B
[docs]
class TestElm327(TestDefaultRxHookBase):
TX_MSGS = [[addr, bus] for addr in [GM_CAMERA_DIAG_ADDR, *range(0x600, 0x800),
*range(0x18DA00F1, 0x18DB00F1, 0x100), # 29-bit UDS physical addressing
*[0x18DB33F1], # 29-bit UDS functional address
] for bus in range(4)]
[docs]
def setUp(self):
self.safety = libpanda_py.libpanda
self.safety.set_safety_hooks(Panda.SAFETY_ELM327, 0)
self.safety.init_tests()
[docs]
def test_tx_hook(self):
# ensure we can transmit arbitrary data on allowed addresses
for bus in range(4):
for addr in self.SCANNED_ADDRS:
should_tx = [addr, bus] in self.TX_MSGS
self.assertEqual(should_tx, self._tx(common.make_msg(bus, addr, 8)))
# ELM only allows 8 byte UDS/KWP messages under ISO 15765-4
for msg_len in DLC_TO_LEN:
should_tx = msg_len == 8
self.assertEqual(should_tx, self._tx(common.make_msg(0, 0x700, msg_len)))
# TODO: perform this check for all addresses
# 4 to 15 are reserved ISO-TP frame types (https://en.wikipedia.org/wiki/ISO_15765-2)
for byte in range(0xff):
should_tx = (byte >> 4) <= 3
self.assertEqual(should_tx, self._tx(common.make_msg(0, GM_CAMERA_DIAG_ADDR, dat=bytes([byte] * 8))))
[docs]
def test_tx_hook_on_wrong_safety_mode(self):
# No point, since we allow many diagnostic addresses
pass
if __name__ == "__main__":
unittest.main()