openpilot_comma/selfdrive/car/disable_ecu.py

from selfdrive.car.isotp_parallel_query import IsoTpParallelQuery
from system.swaglog import cloudlog

EXT_DIAG_REQUEST = b'\x10\x03'
EXT_DIAG_RESPONSE = b'\x50\x03'

COM_CONT_RESPONSE = b''

def disable_ecu(logcan, sendcan, bus=0, addr=0x7d0, com_cont_req=b'\x28\x83\x01', timeout=0.1, retry=10, debug=False):
  """Silence an ECU by disabling sending and receiving messages using UDS 0x28.
  The ECU will stay silent as long as openpilot keeps sending Tester Present.

  This is used to disable the radar in some cars. Openpilot will emulate the radar.
  WARNING: THIS DISABLES AEB!"""
  cloudlog.warning(f"ecu disable {hex(addr)} ...")

  for i in range(retry):
    try:
      query = IsoTpParallelQuery(sendcan, logcan, bus, [addr], [EXT_DIAG_REQUEST], [EXT_DIAG_RESPONSE], debug=debug)

      for _, _ in query.get_data(timeout).items():
        cloudlog.warning("communication control disable tx/rx ...")

        query = IsoTpParallelQuery(sendcan, logcan, bus, [addr], [com_cont_req], [COM_CONT_RESPONSE], debug=debug)
        query.get_data(0)

        cloudlog.warning("ecu disabled")
        return True
    except Exception:
      cloudlog.exception("ecu disable exception")

    print(f"ecu disable retry ({i+1}) ...")
  cloudlog.warning("ecu disable failed")
  return False