基于中断方式LON节点处理器SPI接口设计

为增强LonWorks节点控制能力,采用单片机作为LonWorks节点的主处理器,Neuron芯片作为从处理器;主从处理器采用SPI通信接口;SPI接口利用Neuron芯片中声明的Neurowire对象和AT89S51单片机中用软件模拟SPI操作,以边沿触发中断的方式在8个时钟脉冲的上升沿和下降沿完成主从处理器的数据传递。实际使用表明:用SPI方式实现单片机与Neuron芯片的通信提高Neuron芯片利用率,提高节点的性价比,增强系统可靠性,降低节点开发难度,缩小节点体积。

Design of Processor Interface for LON Node Based on Interruption Using SPI BUS

Control ability of LonWorks node based on microcontroller host processor and Neuron-chip slave processor was raised due to SPI interface for host/slave processor.SPI interface could process data-exchange between host pro-cessor and slave processor in the rising edge and descending edge of eight clock pulse through Neurowire object de-clared in Neuron-chip and SPI operation simulat ed in AT89S51 by an edge triggered interruption.The practice shows that using SPI interface,utilization efficiency of Neuron-chip and cost-performance of node was improved,and system reliability was enhanced,difficulty of node development and node size isreduced.