A serial communication method based on 2 out of 2 architecture

Abstract

The present invention provides a serial port communication method based on a 2 out of 2 architecture, using a directly connected serial port as a 2 out of 2 communication medium between dual CPU channels, including: initializing and creating 2oo2 tasks and non-2oo2 tasks in a first CPU channel and a second CPU channel task; the first non-2oo2 task that needs to carry out communication between dual CPU channels in the first CPU channel packs the data identifier and the data content into a message queue, and simultaneously informs the first 2oo2 task that a message needs to be sent; the described The first 2oo2 task takes out the message and sends it to the second CPU channel; the second 2oo2 task of the second CPU channel receives the sent message, and sends it to the corresponding second non-2oo2 task after verification; the second non-2oo2 task The 2oo2 task verifies the data identifier, and confirms the data content after the verification is passed. The present invention can avoid data congestion and reduce system load.

Description

technical field [0001] The invention relates to the technical field of rail traffic control, in particular to a serial communication method based on a 2-out-of-2 architecture. Background technique [0002] In the field of rail traffic control, safety and reliability are its two important indicators. 2 out of 2 combination-fail-safe architecture is a safety architecture that is often used in high-safety products such as trackside and on-board. The two functions are the same The subsystem performs the same logic operation processing, and compares and confirms the data information generated after processing between the two systems. When the processing results meet expectations, the system can continue to operate normally. Otherwise, it is necessary to follow the principle of fault-oriented safety to make corresponding responses. , this architecture can effectively improve the security and reliability of the system. [0003] Based on different usage scenarios, the software and ...

AI Technical Summary

Problems solved by technology

Frequent information interaction between dual CPU channels, such as task synchronization, data consistency comparison, status confirmation and voting, etc., is characterized by a small amount of data, and the importance and real-time performance will vary according to different functions , it is difficult to meet the above requirements simply by information interaction based on the principle of first-come, first-handled

At the same time, the two subsystems not only need to communicate between the dual CPU channels, but also perform data interaction with the external network and other functional modules, which is likely to cause data congestion and heavy system load.

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