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59 lines
1.4 KiB
59 lines
1.4 KiB
import argparse
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def convert_to(dec_str: str) -> None:
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str_parts = dec_str.split(".")
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assert len(str_parts) == 2
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whole_str, part_str = str_parts
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whole_dec = int(whole_str)
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part_dec = float(f"0.{part_str}")
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part_bits = []
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for i in range(1, 9, 1):
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bit = "0"
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sub = 1 / (1 << i)
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if part_dec > sub:
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bit = "1"
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part_dec = part_dec - sub
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part_bits.append(bit)
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part_dec = int("".join(part_bits), 2)
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assert whole_dec <= 0xFF
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assert part_dec <= 0xFF
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print(f"0x{bytes([whole_dec, part_dec]).hex()}")
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def convert_from(hex_str: str) -> None:
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assert hex_str.startswith("0x")
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assert len(hex_str) == 6
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whole_bin = int(hex_str[2:4], 16)
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# TODO: support negatives
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# if whole_bin & (1 << 7):
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# whole_bin = -
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part_bin = int(hex_str[4:6], 16)
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part_dec = 0
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for i in range(1, 9, 1):
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mask = 1 << (8 - i)
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if part_bin & mask:
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part_dec += 1 / (1 << i)
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print(f"{whole_bin + part_dec}")
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def main() -> None:
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parser = argparse.ArgumentParser("convert_fixed_point")
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parser.add_argument("-d", "--decode", action="store_true")
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parser.add_argument("decimal")
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args = parser.parse_args()
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if args.decode:
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convert_from(args.decimal)
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else:
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convert_to(args.decimal)
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if __name__ == "__main__":
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main()
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