一个简单的log分析脚本实现

CAN报文信号解析

原创于 2021-08-02 20:03:12 发布 · 1.7k 阅读

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#python #log分析工具

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本文介绍了一个用于从CAN总线报文中提取特定信号值并进行转换的Python脚本。通过对log文件的逐行读取与解析，实现了信号值的准确提取，并通过公式计算转换为实际物理量。

文章目录

需求
log数据
脚本源码
解析后的数据
后记

需求

录制了一段CAN报文，数据log，要从中分析出某个信号的值，转换关系y=x*255 + 25

log数据

下面是一部分数据

  can7  001   [8]  02 00 00 00 00 00 00 00
  can7  002   [8]  BC 06 10 73 00 00 00 00
  can7  003   [8]  6E E3 05 00 07 00 DB FF
  can7  004   [8]  50 0F 09 00 E5 FF F6 FF
  can7  005   [8]  5C 23 00 00 00 00 00 00
  can7  001   [8]  02 00 00 00 00 00 00 00
  can7  002   [8]  44 1A 10 73 00 00 00 00
  can7  003   [8]  6F E3 05 00 D8 FF F0 FF
  can7  004   [8]  37 10 05 00 F5 FF FF FF
  can7  005   [8]  5E 23 00 00 00 00 00 00
  can7  001   [8]  02 00 00 00 00 00 00 00
  can7  002   [8]  CC 2D 10 73 00 00 00 00
  can7  003   [8]  70 E3 05 00 EC FF B8 FF
  can7  004   [8]  41 0F E5 FF D6 FF F7 FF
  can7  005   [8]  5E 23 00 00 00 00 00 00
  can7  001   [8]  02 00 00 00 00 00 00 00
  can7  002   [8]  54 41 10 73 00 00 00 00
  can7  003   [8]  71 E3 05 00 EE FF 0E 00
  can7  004   [8]  42 10 21 00 FD FF FA FF
  can7  005   [8]  5E 23 00 00 00 00 00 00
  can7  001   [8]  02 00 00 00 00 00 00 00
  can7  002   [8]  DC 54 10 73 00 00 00 00
  can7  003   [8]  72 E3 05 00 EE FF 8F FF
  can7  004   [8]  31 0F C5 FF CC FF F9 FF
  can7  005   [8]  5E 23 00 00 00 00 00 00
  can7  001   [8]  02 00 00 00 00 00 00 00
  can7  002   [8]  64 68 10 73 00 00 00 00
  can7  003   [8]  73 E3 05 00 F7 FF 27 00
  can7  004   [8]  48 10 40 00 01 00 F6 FF
  can7  005   [8]  65 23 00 00 00 00 00 00
  can7  001   [8]  02 00 00 00 00 00 00 00
  can7  002   [8]  EC 7B 10 73 00 00 00 00
  can7  003   [8]  74 E3 05 00 DC FF 9E FF
  can7  004   [8]  56 0F AE FF C8 FF FA FF
  ......

脚本源码

f = open('imu_can.log', 'r')
fout = open('imu_can.txt', 'w')

def calculate_tmp(input):
    str_tmp = input[19:24]
    tmp = (int(str_tmp[0:2],16) + int(str_tmp[3:5], 16)*255)/255 + 25
    tmp = str(tmp) + '\n'
    fout.write(tmp)

for line in f.readlines():
    if(line[10] == '5'):
        calculate_tmp(line)

解析后的数据

60.36078431372549
60.36862745098039
60.36862745098039
60.36862745098039
60.36862745098039
60.39607843137255
60.39607843137255
60.39607843137255
60.39607843137255
60.35294117647059
60.35294117647059
60.35294117647059
60.411764705882355
60.411764705882355
60.411764705882355
60.411764705882355
60.39607843137255
60.39607843137255
60.39607843137255
60.39607843137255
60.36078431372549
60.36078431372549
60.36078431372549
60.36078431372549
60.36862745098039
60.36862745098039
60.36862745098039
60.36862745098039
60.35294117647059
60.35294117647059
60.35294117647059
60.35294117647059
60.411764705882355