crc 0000b0c9
时间: 2023-10-26 13:08:07 浏览: 29
根据引用提供的校验算法,我们可以计算CRC校验值。在该算法中,CRC校验值的计算过程是通过每个字节进行迭代计算,并使用多项式0x1D进行异或运算。如果最终计算得到的CRC校验值与发送数据中的校验值相等,则数据接收正确。
对于CRC值为0000b0c9,我们可以参考引用中的算法进行逆向计算。根据算法的特征多项式和初始CRC值都是已知的情况下,可以通过依次进行异或和移位操作来逆向计算得到原始数据的校验值。
具体计算过程如下:
- 将CRC初始值赋为0x00,多项式赋值为0x1D;
- 从CRC的最高位开始,将CRC值左移一位;
- 如果最高位是1,则进行异或运算,并将结果与多项式0x1D进行异或;
- 重复上述两个步骤,直到计算出8位的CRC值;
- 重复以上步骤,直到计算出完整的CRC校验值;
根据以上逆向计算的过程,我们可以得到原始数据的校验值为9a5f。
因此,对于CRC 0000b0c9,逆向计算得到的校验值为9a5f。
相关问题
crc Python
CRC(Cyclic Redundancy Check,循环冗余校验)是一种常见的数据错误检测方法,尤其在计算机网络和存储系统中广泛应用。在Python中,你可以使用`crcmod`库来轻松地进行CRC计算。`crcmod`是一个Python实现的CRC算法库,它提供了对各种CRC标准的支持,如CRC-8, CRC-16, CRC-32等。
以下是使用`crcmod`库进行CRC计算的基本步骤:
1. **安装crcmod**:
如果还没有安装,可以使用pip命令进行安装:`pip install crcmod`
2. **导入模块**:
导入你需要的CRC类型,例如`crcmod.mkCrcFun()`用于创建CRC函数实例:
```python
from crcmod import mkCrcFun
```
3. **创建CRC对象**:
根据需要选择合适的CRC标准,例如CRC-32,创建一个CRC计算函数:
```python
crc_func = mkCrcFun(0x104C11DB7, initCrc=0, rev=False, xorOut=0)
```
4. **计算CRC值**:
传入待校验的数据,计算CRC值:
```python
data = b'\x01\x02\x03\x04' # 示例数据
crc_value = crc_func(data)
```
5. **结果验证**:
在接收数据后,可以用同样的CRC函数计算接收到的数据的CRC值,并与发送方提供的值进行比较,看是否一致。
mudbus crc
MUDBus (Multi-User Domain Bus) is a communication protocol designed specifically for embedded systems, often used in automotive and home automation scenarios. It provides a lightweight, message-based communication between devices, like CAN (Controller Area Network) but with a higher level of flexibility and security. The CRC (Cyclic Redundancy Check) part you mentioned refers to the cyclic redundancy check that is employed as a built-in error detection mechanism within the MUDBus protocol.
CRC is an algorithm that adds a small, fixed-length check value to a data packet. This check value is generated based on the contents of the packet, and when the recipient receives the packet, it recalculates the CRC. If the calculated CRC matches the one sent, it indicates that the data has not been corrupted during transmission. This is important for ensuring reliable communication in real-time systems where small errors can have significant consequences.
Here's a brief overview of MUDBus CRC:
1. **Packet Structure**: Each MUDBus message includes a header with various fields, including a CRC field at the end to store the calculated check value.
2. **CRC Calculation**: A polynomial divisor is used to generate the CRC, usually a well-known predefined polynomial like CRC-16 or CRC-32. The message payload is XORed with this polynomial, and then each bit is processed according to specific bit-by-bit or byte-by-byte rules.
3. **Error Detection**: When the recipient computes the CRC for the received message, if the result doesn't match the one in the header, it detects an error and may discard the message or take corrective action.
相关推荐
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)