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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def _gen_crc8_table(poly: int) -> list[int]:
table = []
for i in range(256):
crc = i
for _ in range(8):
if crc & 0x80:
crc = ((crc << 1) ^ poly) & 0xFF
else:
crc = (crc << 1) & 0xFF
table.append(crc)
return table
def _gen_crc16_table(poly: int) -> list[int]:
table = []
for i in range(256):
crc = i << 8
for _ in range(8):
if crc & 0x8000:
crc = ((crc << 1) ^ poly) & 0xFFFF
else:
crc = (crc << 1) & 0xFFFF
table.append(crc)
return table
CRC8H2F = _gen_crc8_table(0x2F)
CRC8J1850 = _gen_crc8_table(0x1D)
CRC16_XMODEM = _gen_crc16_table(0x1021)