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47 lines
1.3 KiB
47 lines
1.3 KiB
4 years ago
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#!/usr/bin/env python3
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import binascii
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import sys
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from collections import defaultdict
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import cereal.messaging as messaging
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from common.realtime import sec_since_boot
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def can_printer(bus=0):
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"""Collects messages and prints when a new bit transition is observed.
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This is very useful to find signals based on user triggered actions, such as blinkers and seatbelt.
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Leave the script running until no new transitions are seen, then perform the action."""
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logcan = messaging.sub_sock('can')
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low_to_high = defaultdict(int)
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high_to_low = defaultdict(int)
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while 1:
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can_recv = messaging.drain_sock(logcan, wait_for_one=True)
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for x in can_recv:
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for y in x.can:
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if y.src == bus:
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i = int.from_bytes(y.dat, byteorder='big')
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l_h = low_to_high[y.address]
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h_l = high_to_low[y.address]
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change = None
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if (i | l_h) != l_h:
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low_to_high[y.address] = i | l_h
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change = "+"
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if (~i | h_l) != h_l:
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high_to_low[y.address] = ~i | h_l
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change = "-"
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if change:
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print(f"{sec_since_boot():.2f}\t{hex(y.address)} ({y.address})\t{change}{binascii.hexlify(y.dat)}")
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if __name__ == "__main__":
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if len(sys.argv) > 1:
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can_printer(int(sys.argv[1]))
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else:
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can_printer()
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