参考AUTOASR E2E Profile 5,进行CANFD的CRC校验,算法为16-bit CCITT-FALSE CRC16,多项式为0x1021,用matlab实现,并封装为函数
时间: 2024-12-16 21:27:39 浏览: 6
在MATLAB中实现CAN FD (Controller Area Network Fast Data) 的 CRC (Cyclic Redundancy Check) 校验,参考 AUTOASR E2E Profile 5 中的16-bit CCITT-FALSE CRC16算法,需要按照以下步骤:
1. **设置 CRC 算法参数**:
- 确定多项式,这里是0x1021,十六进制表示即0b1000000000000001。
2. **创建生成多项式**:
使用多项式0x1021构建生成多项式的二进制形式,然后在MATLAB中表示它。
```matlab
polynomial = '1000000000000001';
```
3. **初始化校验和寄存器**:
初始化一个16位的CRC寄存器为全零,因为CCITT-FALSE通常不需要预先加载。
4. **处理输入数据块**:
对于每一个CAN FD 数据字节,应用CRC算法。你需要将每个字节逐个异或到CRC寄存器上,并根据CCITT-FALSE规则更新。
```matlab
function crcValue = crc16(dataBlock, polynomial)
crcRegister = uint16(0);
for byteIndex = 1 : length(dataBlock)
byte = bitand(uint8(dataBlock(byteIndex)), uint8(0xff)); % Get the current byte
for i = 8:-1:1
if mod(crcRegister, 2) == 1
crcRegister = xor(crcRegister, polynomial);
end
crcRegister = shiftleft(crcRegister, 1); % Shift left
if bitand(byte, 1) ~= 0
crcRegister = xor(crcRegister, polynomial);
end
byte = bitshift(byte, 1); % Shift right and remove least significant bit
end
end
crcValue = crcRegister;
end
```
5. **封装函数**:
将上述代码封装成一个函数,以便于调用:
```matlab
function [crcResult, isValid] = canfd_crc_check(message, polynomial)
crcValue = crc16(arrayfun(@uint8, message), polynomial);
expectedChecksum = calculateExpectedChecksum(message); % Calculate expected checksum based on AUTOASR profile rules
isValid = (crcValue == expectedChecksum);
crcResult = crcValue;
end
% Calculate the expected checksum function (you'll need to implement this according to AUTOASR Profile 5 rules)
function expectedChecksum = calculateExpectedChecksum(message)
% Your implementation here...
end
```
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