55 lines
1.9 KiB
Python
55 lines
1.9 KiB
Python
# 测试校验位计算
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# 成功的合闸报文
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success_command = "FE FE FE FE 68 08 00 09 10 24 20 68 1C 10 35 89 67 45 B7 72 38 9C 4F 33 8C 8C 56 55 34 59 9A 16"
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# 失败的合闸报文（校验位错误）
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fail_command = "FE FE FE FE 68 08 00 09 10 24 20 68 1C 10 35 89 67 45 B7 72 38 9C 4F 33 8C 8C 56 55 34 59 99 16"
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def calculate_command_cs(command_str):
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"""计算指令的CS校验位"""
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try:
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# 将指令拆分为列表
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parts = command_str.split()
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# 移除校验码和结束符（如果存在）
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if len(parts) >= 2:
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parts = parts[:-2]
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# 重新组合为不带校验码和结束符的指令字符串
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command_without_cs = " ".join(parts)
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print(f"计算校验位的指令部分: {command_without_cs}")
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# 转换为字节数组
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command_bytes = bytes.fromhex(command_without_cs)
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print(f"指令字节长度: {len(command_bytes)}")
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# 计算校验和
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cs = 0
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for byte in command_bytes:
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cs ^= byte
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print(f"XOR进行中: 0x{cs:02X}")
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# 转换为2位十六进制字符串
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cs_hex = f"{cs:02X}"
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print(f"最终校验位: {cs_hex}")
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return cs_hex
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except Exception as e:
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print(f"CS校验位计算错误: {e}")
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return "00"
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# 测试成功报文的校验位
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print("=== 测试成功报文的校验位 ===")
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success_cs = calculate_command_cs(success_command)
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print(f"成功报文的校验位: {success_cs}")
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print("\n" + "="*50 + "\n")
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# 测试失败报文的校验位
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print("=== 测试失败报文的校验位 ===")
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fail_cs = calculate_command_cs(fail_command)
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print(f"失败报文的校验位: {fail_cs}")
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print(f"失败报文原校验位: 99")
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print(f"正确的校验位应该是: {fail_cs}")
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# 生成正确的失败报文
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fail_parts = fail_command.split()
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fail_parts[-2] = fail_cs
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correct_fail_command = " ".join(fail_parts)
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print(f"\n正确的报文: {correct_fail_command}") |