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189 lines
9.4 KiB
189 lines
9.4 KiB
6 years ago
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from cereal import car
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from selfdrive.car import apply_std_steer_torque_limits
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from selfdrive.car.volkswagen import volkswagencan
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from selfdrive.car.volkswagen.values import DBC, MQB_LDW_MESSAGES, BUTTON_STATES, CarControllerParams
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from selfdrive.can.packer import CANPacker
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VisualAlert = car.CarControl.HUDControl.VisualAlert
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class CarController():
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def __init__(self, canbus, car_fingerprint):
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self.apply_steer_last = 0
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self.car_fingerprint = car_fingerprint
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# Setup detection helper. Routes commands to an appropriate CAN bus number.
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self.canbus = canbus
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self.packer_gw = CANPacker(DBC[car_fingerprint]['pt'])
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self.hcaSameTorqueCount = 0
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self.hcaEnabledFrameCount = 0
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self.graButtonStatesToSend = None
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self.graMsgSentCount = 0
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self.graMsgStartFramePrev = 0
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self.graMsgBusCounterPrev = 0
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def update(self, enabled, CS, frame, actuators, visual_alert, audible_alert, leftLaneVisible, rightLaneVisible):
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""" Controls thread """
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P = CarControllerParams
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# Send CAN commands.
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can_sends = []
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canbus = self.canbus
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#--------------------------------------------------------------------------
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# #
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# Prepare HCA_01 Heading Control Assist messages with steering torque. #
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# #
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#--------------------------------------------------------------------------
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# The factory camera sends at 50Hz while steering and 1Hz when not. When
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# OP is active, Panda filters HCA_01 from the factory camera and OP emits
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# HCA_01 at 50Hz. Rate switching creates some confusion in Cabana and
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# doesn't seem to add value at this time. The rack will accept HCA_01 at
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# 100Hz if we want to control at finer resolution in the future.
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if frame % P.HCA_STEP == 0:
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# FAULT AVOIDANCE: HCA must not be enabled at standstill. Also stop
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# commanding HCA if there's a fault, so the steering rack recovers.
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if enabled and not (CS.standstill or CS.steeringFault):
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# FAULT AVOIDANCE: Requested HCA torque must not exceed 3.0 Nm. This
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# is inherently handled by scaling to STEER_MAX. The rack doesn't seem
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# to care about up/down rate, but we have some evidence it may do its
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# own rate limiting, and matching OP helps for accurate tuning.
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apply_steer = int(round(actuators.steer * P.STEER_MAX))
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apply_steer = apply_std_steer_torque_limits(apply_steer, self.apply_steer_last, CS.steeringTorque, P)
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# FAULT AVOIDANCE: HCA must not be enabled for >360 seconds. Sending
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# a single frame with HCA disabled is an effective workaround.
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if apply_steer == 0:
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# We can usually reset the timer for free, just by disabling HCA
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# when apply_steer is exactly zero, which happens by chance during
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# many steer torque direction changes. This could be expanded with
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# a small dead-zone to capture all zero crossings, but not seeing a
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# major need at this time.
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hcaEnabled = False
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self.hcaEnabledFrameCount = 0
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else:
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self.hcaEnabledFrameCount += 1
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if self.hcaEnabledFrameCount >= 118 * (100 / P.HCA_STEP): # 118s
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# The Kansas I-70 Crosswind Problem: if we truly do need to steer
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# in one direction for > 360 seconds, we have to disable HCA for a
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# frame while actively steering. Testing shows we can just set the
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# disabled flag, and keep sending non-zero torque, which keeps the
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# Panda torque rate limiting safety happy. Do so 3x within the 360
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# second window for safety and redundancy.
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hcaEnabled = False
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self.hcaEnabledFrameCount = 0
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else:
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hcaEnabled = True
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# FAULT AVOIDANCE: HCA torque must not be static for > 6 seconds.
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# This is to detect the sending camera being stuck or frozen. OP
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# can trip this on a curve if steering is saturated. Avoid this by
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# reducing torque 0.01 Nm for one frame. Do so 3x within the 6
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# second period for safety and redundancy.
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if self.apply_steer_last == apply_steer:
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self.hcaSameTorqueCount += 1
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if self.hcaSameTorqueCount > 1.9 * (100 / P.HCA_STEP): # 1.9s
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apply_steer -= (1, -1)[apply_steer < 0]
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self.hcaSameTorqueCount = 0
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else:
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self.hcaSameTorqueCount = 0
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else:
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# Continue sending HCA_01 messages, with the enable flags turned off.
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hcaEnabled = False
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apply_steer = 0
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self.apply_steer_last = apply_steer
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idx = (frame / P.HCA_STEP) % 16
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can_sends.append(volkswagencan.create_mqb_steering_control(self.packer_gw, canbus.gateway, apply_steer,
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idx, hcaEnabled))
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#--------------------------------------------------------------------------
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# #
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# Prepare LDW_02 HUD messages with lane borders, confidence levels, and #
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# the LKAS status LED. #
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# #
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#--------------------------------------------------------------------------
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# The factory camera emits this message at 10Hz. When OP is active, Panda
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# filters LDW_02 from the factory camera and OP emits LDW_02 at 10Hz.
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if frame % P.LDW_STEP == 0:
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hcaEnabled = True if enabled and not CS.standstill else False
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if visual_alert == VisualAlert.steerRequired:
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hud_alert = MQB_LDW_MESSAGES["laneAssistTakeOverSilent"]
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else:
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hud_alert = MQB_LDW_MESSAGES["none"]
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can_sends.append(volkswagencan.create_mqb_hud_control(self.packer_gw, canbus.gateway, hcaEnabled,
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CS.steeringPressed, hud_alert, leftLaneVisible,
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rightLaneVisible))
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#--------------------------------------------------------------------------
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# #
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# Prepare GRA_ACC_01 ACC control messages with button press events. #
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# #
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#--------------------------------------------------------------------------
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# The car sends this message at 33hz. OP sends it on-demand only for
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# virtual button presses.
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#
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# First create any virtual button press event needed by openpilot, to sync
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# stock ACC with OP disengagement, or to auto-resume from stop.
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if frame > self.graMsgStartFramePrev + P.GRA_VBP_STEP:
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if not enabled and CS.accEnabled:
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# Cancel ACC if it's engaged with OP disengaged.
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self.graButtonStatesToSend = BUTTON_STATES.copy()
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self.graButtonStatesToSend["cancel"] = True
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elif enabled and CS.standstill:
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# Blip the Resume button if we're engaged at standstill.
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# FIXME: This is a naive implementation, improve with visiond or radar input.
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# A subset of MQBs like to "creep" too aggressively with this implementation.
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self.graButtonStatesToSend = BUTTON_STATES.copy()
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self.graButtonStatesToSend["resumeCruise"] = True
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# OP/Panda can see this message but can't filter it when integrated at the
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# R242 LKAS camera. It could do so if integrated at the J533 gateway, but
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# we need a generalized solution that works for either. The message is
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# counter-protected, so we need to time our transmissions very precisely
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# to achieve fast and fault-free switching between message flows accepted
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# at the J428 ACC radar.
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#
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# Example message flow on the bus, frequency of 33Hz (GRA_ACC_STEP):
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#
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# CAR: 0 1 2 3 4 5 6 7 8 9 A B C D E F 0 1 2 3 4 5 6
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# EON: 3 4 5 6 7 8 9 A B C D E F 0 1 2 GG^
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#
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# If OP needs to send a button press, it waits to see a GRA_ACC_01 message
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# counter change, and then immediately follows up with the next increment.
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# The OP message will be sent within about 1ms of the car's message, which
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# is about 2ms before the car's next message is expected. OP sends for an
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# arbitrary duration of 16 messages / ~0.5 sec, in lockstep with each new
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# message from the car.
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#
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# Because OP's counter is synced to the car, J428 immediately accepts the
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# OP messages as valid. Further messages from the car get discarded as
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# duplicates without a fault. When OP stops sending, the extra time gap
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# (GG) to the next valid car message is less than 1 * GRA_ACC_STEP. J428
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# tolerates the gap just fine and control returns to the car immediately.
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if CS.graMsgBusCounter != self.graMsgBusCounterPrev:
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self.graMsgBusCounterPrev = CS.graMsgBusCounter
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if self.graButtonStatesToSend is not None:
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if self.graMsgSentCount == 0:
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self.graMsgStartFramePrev = frame
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idx = (CS.graMsgBusCounter + 1) % 16
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can_sends.append(volkswagencan.create_mqb_acc_buttons_control(self.packer_gw, canbus.extended, self.graButtonStatesToSend, CS, idx))
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self.graMsgSentCount += 1
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if self.graMsgSentCount >= 16:
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self.graButtonStatesToSend = None
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self.graMsgSentCount = 0
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return can_sends
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