github-actions[bot]
de77c89cf6
version: sunnypilot v2026.002.000 (staging) date: 2026-07-21T07:44:02 master commit: 2c334ede443d7391d27575af8c854a095ba702a8
43 lines
921 B
Python
43 lines
921 B
Python
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def _gen_crc8_table(poly: int) -> list[int]:
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table = []
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for i in range(256):
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crc = i
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for _ in range(8):
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if crc & 0x80:
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crc = ((crc << 1) ^ poly) & 0xFF
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else:
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crc = (crc << 1) & 0xFF
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table.append(crc)
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return table
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def _gen_crc16_table(poly: int) -> list[int]:
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table = []
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for i in range(256):
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crc = i << 8
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for _ in range(8):
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if crc & 0x8000:
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crc = ((crc << 1) ^ poly) & 0xFFFF
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else:
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crc = (crc << 1) & 0xFFFF
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table.append(crc)
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return table
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CRC8H2F = _gen_crc8_table(0x2F)
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CRC8J1850 = _gen_crc8_table(0x1D)
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CRC8BODY = _gen_crc8_table(0xD5)
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CRC16_XMODEM = _gen_crc16_table(0x1021)
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def mk_crc8_fun(table: list[int], init_crc: int = 0x00, xor_out: int = 0x00):
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init_reg = init_crc ^ xor_out
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def crc(data: bytes) -> int:
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crc = init_reg
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for b in data:
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crc = table[crc ^ b]
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return crc ^ xor_out
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return crc
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