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31 lines
641 B
31 lines
641 B
3 weeks ago
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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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CRC16_XMODEM = _gen_crc16_table(0x1021)
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