基于SPI总线的无线传感器网络节点

Design of Wireless Senor Network Node Based on SPI Bus

在基于无线传感器网络的分布式测试系统中,为了使同一传感器节点能根据测试任务的需要方便地添加或删除某些功能模块,提出了一种星形结构的SPI总线的设计方案,用于节点的控制模块和各功能模块之间的通信。该方案在传统的SPI通信协议的基础之上,增加了从机呼叫信号以实现通信过程中的2次硬件握手,使节点能以分组交换的方式将测试数据打包发送回基站。实践检验证明:基于SPI总线设计的传感器节点工作稳定,功能拓展方便,可以完成复杂的测试任务。

In the distributed test system based on wireless senor network, aiming at utilizing the same sensor node for adding or deleting some function modules conveniently according to the specific test mission, this paper presented a star configuration design scheme about SPI bus, it was used for communication between the control modules of node and every function module. Based on the traditional SPI communication protocol, it realized hardware handshaking twice through adding slave calling signal during communication, and test data was sent back to basement through packet switching by node. The practice proves that the sensor node based on SPI works stably; it is convenient to develop its function and can meet the need of complex test mission completely.