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[PSOC™] 用Python验证PSoC Creator生成的cyacd每行的checksum

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 楼主| IFX_Lingling 发表于 2024-2-22 15:02 | 显示全部楼层 |阅读模式
SOC, PSOC, CREATOR, CD, AC
本帖最后由 IFX_Lingling 于 2024-2-22 15:20 编辑

在Cypress的 .cyacd 文件中，每一行的校验和(checksum)是通过一个简单的过程计算出来的。校验和的计算过程如下：
1. 首先，把每一行的所有字节值加在一起，包括记录类型、数据长度、地址和数据本身。
2. 然后，取这个和的最后一个字节。也就是说，如果你的和是0x1234，那么你需要取的是0x34。
3. 接下来，取这个字节的二进制反码。二进制反码是通过把所有的1变为0，所有的0变为1得到的。例如，如果你的字节是10110011，那么它的二进制反码就是01001100。
4. 最后，把这个二进制反码加1。这就是你的校验和。
For example：
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  1. 04C811931100
    

  2. :00004D008000100020912600006D2800006D28000080B500AF024B83F3088800F0F1F8C0460010002080B500AF0D4B0D4A12688021C9020A431A60202000F09EF9094B0A4A1A600A4B802212061A60054B802212031A60074B00221A60C046BD4680BDC04600010B4004010B400600008008010B400C020B4080B582B000AF72B6FB1D002228
最后的0x28是checksum的值，下面是验证这个值的步骤：
1：第一步把这一行的数据变成16进制数组的形式：
data = [0x00,0x00,0x4D,0x00,0x80,0x00,0x10,0x00,0x20,0x91,0x26,0x00,0x00,0x6D,0x28,0x00,0x00,0x6D,0x28,0x00,0x00,0x80,0xB5,0x00,0xAF,0x02,0x4B,0x83,0xF3,0x08,0x88,0x00,0xF0,0xF1,0xF8,0xC0,0x46,0x00,0x10,0x00,0x20,0x80,0xB5,0x00,0xAF,0x0D,0x4B,0x0D,0x4A,0x12,0x68,0x80,0x21,0xC9,0x02,0x0A,0x43,0x1A,0x60,0x20,0x20,0x00,0xF0,0x9E,0xF9,0x09,0x4B,0x0A,0x4A,0x1A,0x60,0x0A,0x4B,0x80,0x22,0x12,0x06,0x1A,0x60,0x05,0x4B,0x80,0x22,0x12,0x03,0x1A,0x60,0x07,0x4B,0x00,0x22,0x1A,0x60,0xC0,0x46,0xBD,0x46,0x80,0xBD,0xC0,0x46,0x00,0x01,0x0B,0x40,0x04,0x01,0x0B,0x40,0x06,0x00,0x00,0x80,0x08,0x01,0x0B,0x40,0x0C,0x02,0x0B,0x40,0x80,0xB5,0x82,0xB0,0x00,0xAF,0x72,0xB6,0xFB,0x1D,0x00,0x22]
2：
在python3.11里面运行下面这段代码的输出是0x28。
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  1. def calculate_checksum(array):
    

  2.     sum = 0
    

  3.     for b in array:
    

  4.         sum += b
    

  5.     sum = sum & 0xFF
    

  6.     checksum = ((~sum + 1) & 0xFF)
    

  7.     return checksum
    


  8. 

  9. # 创建一个字节数组
    

  10. data = [0x00,0x00,0x4D,0x00,0x80,0x00,0x10,0x00,0x20,0x91,0x26,0x00,0x00,0x6D,0x28,0x00,0x00,0x6D,0x28,0x00,0x00,0x80,0xB5,0x00,0xAF,0x02,0x4B,0x83,0xF3,0x08,0x88,0x00,0xF0,0xF1,0xF8,0xC0,0x46,0x00,0x10,0x00,0x20,0x80,0xB5,0x00,0xAF,0x0D,0x4B,0x0D,0x4A,0x12,0x68,0x80,0x21,0xC9,0x02,0x0A,0x43,0x1A,0x60,0x20,0x20,0x00,0xF0,0x9E,0xF9,0x09,0x4B,0x0A,0x4A,0x1A,0x60,0x0A,0x4B,0x80,0x22,0x12,0x06,0x1A,0x60,0x05,0x4B,0x80,0x22,0x12,0x03,0x1A,0x60,0x07,0x4B,0x00,0x22,0x1A,0x60,0xC0,0x46,0xBD,0x46,0x80,0xBD,0xC0,0x46,0x00,0x01,0x0B,0x40,0x04,0x01,0x0B,0x40,0x06,0x00,0x00,0x80,0x08,0x01,0x0B,0x40,0x0C,0x02,0x0B,0x40,0x80,0xB5,0x82,0xB0,0x00,0xAF,0x72,0xB6,0xFB,0x1D,0x00,0x22]
    


  11. 

  12. # 计算校验和
    

  13. checksum = calculate_checksum(data)
    


  14. 

  15. # 打印校验和
    

  16. print('The checksum is: ', hex(checksum))
  Python3.11运行结果：
复制
  1. >>> def calculate_checksum(array):
    

  2. ...     sum = 0
    

  3. ...     for b in array:
    

  4. ...         sum += b
    

  5. ...     sum = sum & 0xFF
    

  6. ...     checksum = ((~sum + 1) & 0xFF)
    

  7. ...     return checksum
    

  8. ...
    

  9. >>> # 创建一个字节数组
    

  10. >>> data = [0x00,0x00,0x4D,0x00,0x80,0x00,0x10,0x00,0x20,0x91,0x26,0x00,0x00,0x6D,0x28,0x00,0x00,0x6D,0x28,0x00,0x00,0x80,0xB5,0x00,0xAF,0x02,0x4B,0x83,0xF3,0x08,0x88,0x00,0xF0,0xF1,0xF8,0xC0,0x46,0x00,0x10,0x00,0x20,0x80,0xB5,0x00,0xAF,0x0D,0x4B,0x0D,0x4A,0x12,0x68,0x80,0x21,0xC9,0x02,0x0A,0x43,0x1A,0x60,0x20,0x20,0x00,0xF0,0x9E,0xF9,0x09,0x4B,0x0A,0x4A,0x1A,0x60,0x0A,0x4B,0x80,0x22,0x12,0x06,0x1A,0x60,0x05,0x4B,0x80,0x22,0x12,0x03,0x1A,0x60,0x07,0x4B,0x00,0x22,0x1A,0x60,0xC0,0x46,0xBD,0x46,0x80,0xBD,0xC0,0x46,0x00,0x01,0x0B,0x40,0x04,0x01,0x0B,0x40,0x06,0x00,0x00,0x80,0x08,0x01,0x0B,0x40,0x0C,0x02,0x0B,0x40,0x80,0xB5,0x82,0xB0,0x00,0xAF,0x72,0xB6,0xFB,0x1D,0x00,0x22]
    

  11. >>>
    

  12. >>> # 计算校验和
    

  13. >>> checksum = calculate_checksum(data)
    

  14. >>>
    

  15. >>> # 打印校验和
    

  16. >>> print('The checksum is: ', hex(checksum))
    

  17. The checksum is:  0x28
    

  18. >>>
    


  19.


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呐咯密密 发表于 2024-2-22 15:08 | 显示全部楼层
过程讲解很详细，感谢
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IFX-WellinZ 发表于 2024-2-28 17:30 | 显示全部楼层
很棒！讲的非常清楚了
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ClarkLLOTP 发表于 2024-2-28 17:45 来自手机 | 显示全部楼层
这个是干嘛用的啊
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 楼主| IFX_Lingling 发表于 2024-9-12 09:24 | 显示全部楼层
ClarkLLOTP 发表于 2024-2-28 17:45
这个是干嘛用的啊

这个主要是为了验证一下checksum的计算，同时提供了计算checksum的方法。
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suncat0504 发表于 2024-9-15 15:39 | 显示全部楼层
好家伙，用MicroPython编程，确实方便啊
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shenxiaolin 发表于 2024-9-20 18:32 | 显示全部楼层
有个算法就好了，
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szt1993 发表于 2024-9-24 12:30 | 显示全部楼层
校验和(checksum)是通过一个简单的过程计算出来
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OKAKAKO 发表于 2024-9-28 16:37 | 显示全部楼层
校验和是通讯经常使用的一种手段
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AdaMaYun 发表于 2024-9-30 11:26 | 显示全部楼层
checksum现在又硬件校验更方便准确
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