A DBC file parsing and message analysis method based on regular expressions

Abstract

The invention discloses a DBC file parsing and message analyzing method based on a regular expression. In the method, a content of a DBC file is parsed through a processing method of matching and substituting of the regular expression, the parsed DBC data is used for analyzing a CAN message acquired from a finished automobile, a corresponding CAN network message block in the DBC file and signals contained in the CAN network message block are found according to a message ID, actual data is obtained through data type, start bit, bit length, offset, proportionality coefficient and parsing type ofthe CAN network message block, and the data is stored in a corresponding file. The method provided by the invention has excellent effects of being simple and highly expandable, not only being capableof performing CAN message parsing, but also being capable of performing acquisition and calibration of use completed data of protocols of XCP and CCP.

Description

technical field [0001] The invention relates to a DBC file analysis and message analysis method based on regular expressions, and belongs to the technical field of CAN bus of new energy vehicles. Background technique [0002] At present, with the development of new energy vehicle technology, the functions of the vehicle are becoming more and more complex, and the safety requirements are getting higher and higher, so more and more controllers are applied to the vehicle. In order to realize real-time communication between different controllers, CAN bus is also widely used. Through the CAN network, the data of different controllers are sent to the CAN bus with ID as the distinction, and the controller quickly finds the required data from the bus. The CAN bus has the functions of arbitration and inspection, which can ensure the accuracy of the data. Reliable and stable fieldbus. However, because the message IDs and bus data between controllers are different, the amount of data...

AI Technical Summary

Problems solved by technology

However, because the message IDs and bus data between controllers are different, the amount of data on the CAN network is very large, and it is difficult to manage the data on the CAN network and quickly extract the required data. Different understanding of the protocol will lead to different parsing methods for the same frame message, resulting in parsing errors

[0003] At present, the traditional message analysis method is to manually extract and then calculate, or write corresponding calculation scripts according to the communication protocol, and then complete the data calculation in the Excel table. This method needs to waste a lot of manpower and time. Moreover, it is easy to cause errors in the analyzed data due to operator errors and omissions, especially when the CAN network data sample is very large, the difficulty of operation will also increase

In addition, the method of scripting is not suitable for data analysis between different car models, because different scripts must be written for each communication protocol, and different scripts are applied for different communication protocols of different car models, which is complex and difficult. Poor compatibility, troublesome modification, and cannot support reverse analysis of data, cannot quickly recompose data into CAN network messages, and the application has limitations

Images