MSB和LSB应该用于输入Bootloader数据包吗？

你好，
有两种类型的校验和计算，它们可以在引导加载程序组件配置（基本求和和CRC-16-ccITT）中选择。
在此基础上，CyAcd报头中的校验和选项发生变化。你能检查一下你是否计算这个配置的校验和？
谢谢，
希马



     以下为原文
  Hello,
 
There are two types of checksum calculations which can be selected in the Bootloader component configuration (Basic Summation and CRC-16-CCITT).
Based on this the checksum option in the .cyacd header changes. Can you check if you are calculation the checksum with respect to this configuration?
 
Thanks,
Hima

嗨，Hima，
我检查只是为了确保，但选择的选项是基本求和，这是我准备我的数据包。我相当肯定，求和使用了两个补码，其中LSB首先被发送，MSB被发送到第二个。问题可能在我的LSB和MSB中，但我几乎可以肯定，发送的是正确的值。下面是VisualStudio中的第一个包以及错误包的构建，希望这能为问题提供更多的启发。
字节[]分组=新字节[7 ]；
包[ 0 ]＝0x01；/ /开始
分组〔1〕＝0x38；/ /命令码
分组〔2〕＝0x00；/ /长度LSB
分组〔3〕＝0x00；/ /长度MSB
分组〔4〕＝0x0C；/ /校验和LSB
分组〔5〕＝0x07；//校验和MSB
包[ 6 ]＝0x17；/ /结束
响应包
1 8 0 0 0 247 255 23
-谢谢
亚当



     以下为原文
  Hi Hima,
 
I checked just to make sure but the option that is selected is the basic summation, which is what I prepared my packets for.  I'm fairly certain that summation uses two's complement where the LSB is sent first and the MSB is sent second. The issue might be in my LSB and MSB but i'm almost certain that what is being sent are the correct values. Below is the construction of the first packet in Visual Studio along with the error packet, hope this sheds some more light on the issue.
 
byte[] packet = new byte[7];
packet[0] = 0x01; // start
packet[1] = 0x38; // command code
packet[2] = 0x00; // Length LSB
packet[3] = 0x00; // Length MSB
packet[4] = 0x0C; // Checksum LSB
packet[5] = 0x07; // Checksum MSB
packet[6] = 0x17; // End
 
Response packet
1  8   0    0    247   255     23
 
-Thanks
  Adam

你好，
实际上，对于包计算的校验和是错误的，根据基本求和。校验和应该是C7 FF。
校验和=（0x01+（0xFFF-（0x01+0x38）））= FFC7
你能试试这个吗？
谢谢，
希马



     以下为原文
  Hello ,
 
Actually the checksum calculated for the packet is wrong as per basic summation. The checksum should be c7 ff.
Checksum = (0x01+(0xFFFF- (0x01+0x38)))= FF C7
 
can you try this?
 
Thanks,
Hima

嗨，Hima，
这是有效的！所以我以后不会有任何问题，我如何计算一个具有多个字节的包的校验和？
-谢谢
亚当



     以下为原文
  Hi Hima,
 
This works! Just so I don't have any questions in the future, how would I calculate the checksum for a packet with multiple bytes?
 
-Thanks
  Adam

它应该类似于上面提到的方法。添加所有8个字节。从0xFFFF中减去并添加0x01。
谢谢，
希马



     以下为原文
  It should be similar to the method mentioned above. Add all the 8 bytes. Subtract from 0xFFFF and add 0x01.
 
Thanks,
Hima