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105 lines
3.8 KiB
105 lines
3.8 KiB
#!/usr/bin/env python3
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from __future__ import print_function
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import os
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import sys
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import jinja2
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from collections import Counter
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from common.dbc import dbc
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def main():
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if len(sys.argv) != 3:
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print("usage: %s dbc_directory output_filename" % (sys.argv[0],))
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sys.exit(0)
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dbc_dir = sys.argv[1]
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out_fn = sys.argv[2]
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dbc_name = os.path.split(out_fn)[-1].replace('.cc', '')
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template_fn = os.path.join(os.path.dirname(__file__), "dbc_template.cc")
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with open(template_fn, "r") as template_f:
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template = jinja2.Template(template_f.read(), trim_blocks=True, lstrip_blocks=True)
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can_dbc = dbc(os.path.join(dbc_dir, dbc_name + '.dbc'))
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msgs = [(address, msg_name, msg_size, sorted(msg_sigs, key=lambda s: s.name not in ("COUNTER", "CHECKSUM"))) # process counter and checksums first
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for address, ((msg_name, msg_size), msg_sigs) in sorted(can_dbc.msgs.items()) if msg_sigs]
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def_vals = {a: sorted(set(b)) for a, b in can_dbc.def_vals.items()} # remove duplicates
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def_vals = sorted(def_vals.items())
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if can_dbc.name.startswith(("honda_", "acura_")):
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checksum_type = "honda"
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checksum_size = 4
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counter_size = 2
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checksum_start_bit = 3
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counter_start_bit = 5
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little_endian = False
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elif can_dbc.name.startswith(("toyota_", "lexus_")):
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checksum_type = "toyota"
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checksum_size = 8
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counter_size = None
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checksum_start_bit = 7
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counter_start_bit = None
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little_endian = False
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elif can_dbc.name.startswith(("vw_", "volkswagen_", "audi_", "seat_", "skoda_")):
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checksum_type = "volkswagen"
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checksum_size = 8
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counter_size = 4
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checksum_start_bit = 0
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counter_start_bit = 0
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little_endian = True
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else:
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checksum_type = None
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checksum_size = None
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counter_size = None
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checksum_start_bit = None
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counter_start_bit = None
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little_endian = None
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# sanity checks on expected COUNTER and CHECKSUM rules, as packer and parser auto-compute those signals
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for address, msg_name, msg_size, sigs in msgs:
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dbc_msg_name = dbc_name + " " + msg_name
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for sig in sigs:
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if checksum_type is not None:
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# checksum rules
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if sig.name == "CHECKSUM":
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if sig.size != checksum_size:
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sys.exit("%s: CHECKSUM is not %d bits long" % (dbc_msg_name, checksum_size))
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if sig.start_bit % 8 != checksum_start_bit:
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sys.exit("%s: CHECKSUM starts at wrong bit" % dbc_msg_name)
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if little_endian != sig.is_little_endian:
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sys.exit("%s: CHECKSUM has wrong endianess" % dbc_msg_name)
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# counter rules
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if sig.name == "COUNTER":
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if counter_size is not None and sig.size != counter_size:
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sys.exit("%s: COUNTER is not %d bits long" % (dbc_msg_name, counter_size))
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if counter_start_bit is not None and sig.start_bit % 8 != counter_start_bit:
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print(counter_start_bit, sig.start_bit)
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sys.exit("%s: COUNTER starts at wrong bit" % dbc_msg_name)
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if little_endian != sig.is_little_endian:
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sys.exit("%s: COUNTER has wrong endianess" % dbc_msg_name)
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# pedal rules
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if address in [0x200, 0x201]:
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if sig.name == "COUNTER_PEDAL" and sig.size != 4:
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sys.exit("%s: PEDAL COUNTER is not 4 bits long" % dbc_msg_name)
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if sig.name == "CHECKSUM_PEDAL" and sig.size != 8:
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sys.exit("%s: PEDAL CHECKSUM is not 8 bits long" % dbc_msg_name)
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# Fail on duplicate message names
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c = Counter([msg_name for address, msg_name, msg_size, sigs in msgs])
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for name, count in c.items():
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if count > 1:
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sys.exit("%s: Duplicate message name in DBC file %s" % (dbc_name, name))
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parser_code = template.render(dbc=can_dbc, checksum_type=checksum_type, msgs=msgs, def_vals=def_vals, len=len)
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with open(out_fn, "w") as out_f:
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out_f.write(parser_code)
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if __name__ == '__main__':
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main()
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