Method for automatically allocating address to same node on communication bus

Abstract

The invention relates to a method for automatically allocating an address to the same node on a communication bus. The method includes the following steps: step S1, setting a global variable address allocation tag, initializing the address allocation tag as an address unallocated state, judging whether the address allocation tag of a current node is unallocated, if not, executing the step S2, andif yes, executing the step S3; step S2, judging whether an address of the current node conflicts with a stored address, if yes, executing the step S3, and if not, executing the step S5; step S3, allocating an initial address that is a minimum address number '1' on the bus to the current node; step S4, judging whether the address of the current node conflicts with the stored address, if not, executing the step S5, and if yes, adding 1 to the address of the current node, and re-executing the step S4; and step S5, switching the address allocation tag to an address allocated state and remaining unchanged. According to the method disclosed by the invention, when equipment replaces a CAN bus due to the movement of the node, the reallocation of the address can be avoided, repeated addresses can be automatically rearranged in time, and bus data errors caused by the repeated addresses can be avoided.

Description

technical field [0001] The invention relates to the field of shift control of an automatic gearbox, in particular to a method for automatically assigning addresses to the same nodes on a communication bus. Background technique [0002] Multiple identical devices are connected through the same CAN bus, and send messages at regular intervals. A device connected to the CAN bus is a node on the current bus. The messages sent by this node to the bus are used by other nodes. Each node in the bus should have a unique address. Each node on the bus follows the same communication protocol to stipulate the format, data meaning and sending cycle of each message, and the message format, data meaning and sending cycle sent by each node are the same. The communication protocol stipulates that some data in the message should be the address of the node sending the message, and each message is distinguished from which node it comes from according to the node address, so before using it, it...

AI Technical Summary

Problems solved by technology

[0009] In view of the above-mentioned analysis, the present invention aims to provide a method for automatically assigning addresses to the same nodes on the communication bus, in order to solve the problem that there are multiple identical device nodes connected to the same CAN bus in the prior art, and this node cannot be automatically assigned on the bus. Many technical issues such as the address on

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