openpilot is an open source driver assistance system. openpilot performs the functions of Automated Lane Centering and Adaptive Cruise Control for over 200 supported car makes and models.
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#!/usr/bin/env python
import os
from selfdrive.can.parser import CANParser
from cereal import car
from common.realtime import sec_since_boot
import zmq
from selfdrive.services import service_list
import selfdrive.messaging as messaging
RADAR_MSGS_C = range(0x2c2, 0x2d4+2, 2) # c_ messages 706,...,724
RADAR_MSGS_D = range(0x2a2, 0x2b4+2, 2) # d_ messages
LAST_MSG = max(RADAR_MSGS_C + RADAR_MSGS_D)
NUMBER_MSGS = len(RADAR_MSGS_C) + len(RADAR_MSGS_D)
def _create_radard_can_parser():
dbc_f = 'chrysler_pacifica_2017_hybrid_private_fusion.dbc'
msg_n = len(RADAR_MSGS_C)
# list of [(signal name, message name or number, initial values), (...)]
# [('RADAR_STATE', 1024, 0),
# ('LONG_DIST', 1072, 255),
# ('LONG_DIST', 1073, 255),
# ('LONG_DIST', 1074, 255),
# ('LONG_DIST', 1075, 255),
# The factor and offset are applied by the dbc parsing library, so the
# default values should be after the factor/offset are applied.
signals = list(zip(['LONG_DIST'] * msg_n +
['LAT_DIST'] * msg_n +
['REL_SPEED'] * msg_n,
RADAR_MSGS_C * 2 + # LONG_DIST, LAT_DIST
RADAR_MSGS_D, # REL_SPEED
[0] * msg_n + # LONG_DIST
[-1000] * msg_n + # LAT_DIST
[-146.278] * msg_n)) # REL_SPEED set to 0, factor/offset to this
# TODO what are the checks actually used for?
# honda only checks the last message,
# toyota checks all the messages. Which do we want?
checks = list(zip(RADAR_MSGS_C +
RADAR_MSGS_D,
[20]*msg_n + # 20Hz (0.05s)
[20]*msg_n)) # 20Hz (0.05s)
return CANParser(os.path.splitext(dbc_f)[0], signals, checks, 1)
def _address_to_track(address):
if address in RADAR_MSGS_C:
return (address - RADAR_MSGS_C[0]) // 2
if address in RADAR_MSGS_D:
return (address - RADAR_MSGS_D[0]) // 2
raise ValueError("radar received unexpected address %d" % address)
class RadarInterface(object):
def __init__(self, CP):
self.pts = {}
self.delay = 0.0 # Delay of radar #TUNE
self.rcp = _create_radard_can_parser()
context = zmq.Context()
self.logcan = messaging.sub_sock(context, service_list['can'].port)
def update(self):
canMonoTimes = []
updated_messages = set() # set of message IDs (sig_addresses) we've seen
while 1:
tm = int(sec_since_boot() * 1e9)
updated_messages.update(self.rcp.update(tm, True))
if LAST_MSG in updated_messages:
break
ret = car.RadarState.new_message()
errors = []
if not self.rcp.can_valid:
errors.append("commIssue")
ret.errors = errors
ret.canMonoTimes = canMonoTimes
for ii in updated_messages: # ii should be the message ID as a number
cpt = self.rcp.vl[ii]
trackId = _address_to_track(ii)
if trackId not in self.pts:
self.pts[trackId] = car.RadarState.RadarPoint.new_message()
self.pts[trackId].trackId = trackId
self.pts[trackId].aRel = float('nan')
self.pts[trackId].yvRel = float('nan')
self.pts[trackId].measured = True
if 'LONG_DIST' in cpt: # c_* message
self.pts[trackId].dRel = cpt['LONG_DIST'] # from front of car
# our lat_dist is positive to the right in car's frame.
# TODO what does yRel want?
self.pts[trackId].yRel = cpt['LAT_DIST'] # in car frame's y axis, left is positive
else: # d_* message
self.pts[trackId].vRel = cpt['REL_SPEED']
# We want a list, not a dictionary. Filter out LONG_DIST==0 because that means it's not valid.
ret.points = [x for x in self.pts.values() if x.dRel != 0]
return ret
if __name__ == "__main__":
RI = RadarInterface(None)
while 1:
ret = RI.update()
print(chr(27) + "[2J") # clear screen
print(ret)