A method for automatically assigning addresses to identical nodes on a communication bus

Abstract

The present invention relates to a method for automatically allocating addresses for the same node on a communication bus, comprising: step S1, setting a global variable address allocation flag, initializing the address allocation flag as address unallocated, judging whether the address allocation flag of this node is unallocated, if not, Execute step S2, yes, execute step S3; step S2, judge whether the address of this node conflicts with the stored address, yes, execute step S3, no, execute step S5; step S3, assign the initial address to the node as the minimum address on the bus No. "1"; step S4, judge whether the address of this node conflicts with the stored address, if no, execute step S5, if yes, increase the address of this node by 1, and execute step S4 again; step S5, change the address assignment flag to address assigned , and remain unchanged. The present invention avoids address redistribution when the CAN bus is changed due to node movement, automatically rearranges repeated addresses in time, and avoids bus data errors caused by address repetition.

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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