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破解汽车CAN协议，有没有简单的办法？
目前市面上的汽车全部采用传输速度更快，信号更稳定的CAN总线。所以，对于开发汽车CAN总线系列产品已经是非常的火热了。利用汽车OBD接口，通过CANBUS协议与汽车ECU通信，就可以控制汽车的某个部件了。
存在的问题：
虽然利用CAN总线开发产品技术已经比较成熟了，但开发产品也是存在许多问题的，但目前存在的最大问题就是：不清楚通过何种指令发送给ECU，从而控制目标器件。
解决方法：
现市场上有很多开发工具，通过USB接口将工具连接至CAN网络中，对CAN网络中的数据进行采集，再通过专业分析工具对其解析从而得出相应的指令。
以USBCAN-2E-U为例：
1、打开CANtest通用测试软件，选择USBCAN-2E-U接口卡，并且选定总线的波特率，点击确定并启动，启动CAN接口卡。如图1所示；
图1 打开CANtest软件初始化
2、点击菜单快捷操作中的DBC解析按钮，进入DBC解析界面，如图2所示；
图2 打开DBC解析
3、DBC解析界面中，点击加载DBC，选择对应的DBC文件打开，本文以J1939协议为例，选择j1939.dbc打开，解析柴油机、卡车或者公交车等协议，如图3所示。
图3 加载DBC文件
4、此时接收数据即可进行DBC解析，用户可以使用分类显示或者刷新显示查看。此时点击某个报文，下方解析框中将这帧包含的应用数据显示出来，如图4所示，ID为0x0CF0041A中第三个字节为0x6C，这个代表着EngSpeed（发动机转速）为6861.50rpm（转/分）。
图4 数据解析
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