目录
  • 一、工具包安装
  • 二、解析blf文件
  • 总结

一、工具包安装

pip install cantools python-can

二、解析blf文件

一般情况下,解析blf需要dbc文件,当然其实不用dbc也可以,只不过解析比较麻烦,推荐还是配合dbc解析,这个也是我们最常用的办法。所以要用dbc,需要先加载dbc文件,这里需要cantools,代码:

import cantools import can dbc_file = r"C:\Users\master01\Downloads\blf_conf\FS04通用_TBOX(1).dbc" dbc = cantools.db.load_file(dbc_file)

加载完dbc文件,就可以解析blf文件了,代码

f = r"C:\Users\master01\Downloads\blfdata\问题blf\1.17-9-10.blf" log_data = can.BLFReader(f) for msg in log_data: print(msg)

打印结果是这样的

Timestamp: .026000 ID: 0301 S Rx DL: 8 1d b0 41 54 07 02 00 00 Channel: 0
Timestamp: .026000 ID: 070b S Rx DL: 8 00 c8 0c b6 24 b8 24 b8 Channel: 0
Timestamp: .028000 ID: 0322 S Rx DL: 8 00 00 00 00 00 00 03 00 Channel: 0
Timestamp: . ID: 030d S Rx DL: 8 00 14 00 00 00 00 00 00 Channel: 0
Timestamp: . ID: 0320 S Rx DL: 8 06 b1 00 00 00 00 07 00 Channel: 0
Timestamp: . ID: 0708 S Rx DL: 8 00 48 00 48 00 08 00 32 Channel: 0
Timestamp: . ID: 0712 S Rx DL: 8 00 06 81 0d 21 05 00 00 Channel: 0
Timestamp: . ID: 1821a7c1 X Rx DL: 8 02 2f 00 00 00 00 00 00 Channel: 0
Timestamp: . ID: 0110 S Rx DL: 8 05 36 16 67 00 09 20 6b Channel: 0
Timestamp: . ID: 0111 S Rx DL: 8 16 5d 00 00 d4 00 20 bf Channel: 0
Timestamp: . ID: 0112 S Rx DL: 8 49 32 00 10 00 16 6d 4c Channel: 0
Timestamp: . ID: 0300 S Rx DL: 8 00 3a c2 f8 00 00 00 00 Channel: 0
Timestamp: . ID: 0710 S Rx DL: 8 00 00 00 00 00 00 00 00 Channel: 0
Timestamp: . ID: 0709 S Rx DL: 8 0e 02 0e b0 4a 0c ff fe Channel: 0
Timestamp: . ID: 070a S Rx DL: 8 11 51 1f fd 46 de 1c 83 Channel: 0
Timestamp: . ID: 0711 S Rx DL: 8 02 df 00 09 02 d5 00 d4 Channel: 0
Timestamp: . ID: 0308 S Rx DL: 8 03 22 0a 3c 0a 00 00 2a Channel: 0
Timestamp: . ID: 03a1 S Rx DL: 8 00 00 06 b1 00 00 15 00 Channel: 0
Timestamp: . ID: 03a2 S Rx DL: 8 00 00 00 00 00 00 05 00 Channel: 0
Timestamp: . ID: 0270 S Rx DL: 8 00 67 67 00 00 00 00 a2 Channel: 0
Timestamp: . ID: 0307 S Rx DL: 8 41 14 03 c0 36 00 00 03 Channel: 0
Timestamp: . ID: 0309 S Rx DL: 8 1c 1c 1c 1c 1c 1c c3 50 Channel: 0
Timestamp: . ID: 03a0 S Rx DL: 8 06 b1 00 00 00 00 15 00 Channel: 0
Timestamp: . ID: 030a S Rx DL: 8 00 00 00 00 00 00 00 00 Channel: 0

可以发现,时间戳解析出来了,其它的数据都是16进制,没法直接看,当然我们如果熟悉blf格式,可以自己把数据还原出来,但是既然已经用第三方库,我们当然就不用自己解析了,而且仔细观察一下即可发现,之前的加载dbc并没有用上,所以这时一个重要的函数登场了,那就是dbc.decode_message(id,data),具体代码如下

decoded = {} for msg in logdata: try: dec = dbc.decode_message(msg.arbitration_id, msg.data) if dec: for key, data in dec.items(): if key not in decoded: decoded[key] = [] decoded[key].append([msg.timestamp, data]) except: pass

因为我这里是最后把数据解析出来转成mf4了,所以构建了一个decoded字典,每个key里记一个信号,熟悉mf4的应该知道,mf4里每个信号主要包含两部分,一个是时间戳,一个是数据,有了这两个,我们就可以创建mf4文件了,最后放上创建mf4的代码

from asammdf import MDF,Signal sigs = [] for k,v in decoded.items(): timestamps = [i[0] for i in v] data = [i[1] for i in v] s = Signal(data,timestamps,name=k) sigs.append(s) mdf = MDF() mdf.append(sigs) mdf.save("xx.mf4",overwrite=True)

这样就实现了blf文件的解析与转换,当然,转换的格式很自由,只要熟悉相应的格式,比如csv,hdf5,xlsx,json,pickle都可以,因为我们已经拿到原始数据了,保存成什么格式就很简单了。

总结

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