A master-slave can bus application layer communication method

Abstract

The invention discloses a master-slave CAN (Controller Area Network) bus application layer communication method, which comprises the following steps that: question and answer type communication is adopted, a master node is used as an initiator of primary interactive communication, the master node sends different types of broadcast instructions to slave nodes, and the slave nodes are required to execute various actions simultaneously; after execution of the slave nodes is completed, responding to the execution state to the master node; the master node instructs the specific slave node to execute the specific instruction so as to independently control the slave node or acquire information; the slave node responds to the specific state data to the master node according to the specific instruction; and when detecting that the slave node has a fault, the slave node actively sends an abnormal state notification to the master node, and the master node does not need to respond. The protocol may be implemented by a standard frame or an extended frame. The master-slave type one-master multi-slave CAN bus application layer communication method is designed according to the requirements of small and medium-sized CAN bus systems in practical application, and is simple, easy to use and convenient to popularize.

Description

technical field [0001] The present invention relates to the field of CAN (Controller Area Network, controller local area network) bus, in particular to a master-slave CAN bus application layer communication method, or CAN bus application layer protocol. Background technique [0002] CAN, or Controller Area Network, is a bus-type serial communication network with high performance and high reliability. The CAN bus communication interface integrates the physical layer and data link layer functions of the CAN protocol. Each frame of information has a cyclic redundancy code check and other error detection measures to ensure the reliability of data transmission; at the same time, the configurable Multi-priority design, non-destructive arbitration technology and high communication rate ensure real-time data transmission. [0003] However, the application layer communication method is not defined in the CAN bus. In specific project applications, a suitable application layer protoco...

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Problems solved by technology

[0003] However, the application layer communication method is not defined in the CAN bus. In specific project applications, a suitable application layer protocol must be designed

At present, there are many types of CAN bus application layer protocols, but these protocols are complex general-purpose protocols or special-purpose protocols in specific fields. The use of complex general-purpose protocols in small and medium-sized systems will increase development costs and extend development cycles. , and the special protocol often does not meet the requirements of specific applications, and has great limitations

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