89 lines
3.1 KiB
Python
Executable File
89 lines
3.1 KiB
Python
Executable File
#!/usr/bin/env python3
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import csv
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import sys
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class Message():
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"""Details about a specific message ID."""
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def __init__(self, message_id):
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self.message_id = message_id
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self.ones = [0] * 8 # bit set if 1 is always seen
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self.zeros = [0] * 8 # bit set if 0 is always seen
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def printBitDiff(self, other):
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"""Prints bits that transition from always zero to always 1 and vice versa."""
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for i in range(len(self.ones)):
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zero_to_one = other.zeros[i] & self.ones[i]
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if zero_to_one:
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print('id %s 0 -> 1 at byte %d bitmask %d' % (self.message_id, i, zero_to_one))
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one_to_zero = other.ones[i] & self.zeros[i]
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if one_to_zero:
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print('id %s 1 -> 0 at byte %d bitmask %d' % (self.message_id, i, one_to_zero))
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class Info():
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"""A collection of Messages."""
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def __init__(self):
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self.messages = {} # keyed by MessageID
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def load(self, filename, start, end):
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"""Given a CSV file, adds information about message IDs and their values."""
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with open(filename, 'rb') as inp:
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reader = csv.reader(inp)
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next(reader, None) # skip the CSV header
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for row in reader:
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if not len(row):
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continue
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time = float(row[0])
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bus = int(row[2])
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if time < start or bus > 127:
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continue
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elif time > end:
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break
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if row[1].startswith('0x'):
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message_id = row[1][2:] # remove leading '0x'
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else:
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message_id = hex(int(row[1]))[2:] # old message IDs are in decimal
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message_id = '%s:%s' % (bus, message_id)
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if row[3].startswith('0x'):
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data = row[3][2:] # remove leading '0x'
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else:
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data = row[3]
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new_message = False
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if message_id not in self.messages:
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self.messages[message_id] = Message(message_id)
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new_message = True
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message = self.messages[message_id]
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bts = bytearray.fromhex(data)
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for i in range(len(bts)):
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ones = int(bts[i])
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message.ones[i] = ones if new_message else message.ones[i] & ones
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# Inverts the data and masks it to a byte to get the zeros as ones.
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zeros = (~int(bts[i])) & 0xff
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message.zeros[i] = zeros if new_message else message.zeros[i] & zeros
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def PrintUnique(log_file, low_range, high_range):
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# find messages with bits that are always low
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start, end = list(map(float, low_range.split('-')))
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low = Info()
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low.load(log_file, start, end)
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# find messages with bits that are always high
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start, end = list(map(float, high_range.split('-')))
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high = Info()
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high.load(log_file, start, end)
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# print messages that go from low to high
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found = False
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for message_id in sorted(high.messages):
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if message_id in low.messages:
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high.messages[message_id].printBitDiff(low.messages[message_id])
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found = True
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if not found:
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print('No messages that transition from always low to always high found!')
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if __name__ == "__main__":
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if len(sys.argv) < 4:
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print('Usage:\n%s log.csv <low-start>-<low-end> <high-start>-<high-end>' % sys.argv[0])
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sys.exit(0)
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PrintUnique(sys.argv[1], sys.argv[2], sys.argv[3])
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