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设计了一种基于ARM7TDMI内核的32位微控制器LPC2119的CAN节点方案,给出了相应的硬件电路图,并通过与SJA1000特点的对比分析,提出CAN节点初始化、收发报文和总线异常处理等软件实现要点;本方案的CAN节点处理能力强,实现简单,可靠性高,已在水电厂监控、水电厂辅设控制和小水电综合自动化控制系统中获得应用。
A CAN node scheme based on ARM7TDMI 32-bit microcontroller LPC2119 is designed. The corresponding hardware circuit diagram is given. By comparing with the features of SJA1000, this paper presents CAN node initialization, send and receive messages and bus exception handling software The main points of the implementation are as follows: The CAN node of the scheme has strong processing capability, simple implementation and high reliability, and has been applied in the monitoring of hydropower plants, the auxiliary control of hydropower plants and the integrated automation control system of small hydropower.