基于EPA的嵌入式控制器软件协议栈实现

基于EPA的嵌入式控制器软件协议栈实现
Implementation of EPA-based Embedded Controller Software Protocol Stack

摘要:首先提出基于AT91R40008与非PCI总线以太网控制器AX887%的EPA接口控制器硬件电路设计方法。之后在深入剖析EPA通信模型的基础上，重点阐述了如何移植由Adam Dunkels编写的开源TCP/1P协议栈UIP以满足EPA协议标准;针对AX887%的软件驱动模块，重点指出其驱动代码设计的关键点;就EPA通信模型的核心模块，如EPA服务、套接字映射接口、基于IEEE1588的时间同步、EPA管理信息库等的实现进行了深人研究。经过EPA一致性和EPA互操作性等测试平台测试，时钟同步精度目前可达到微秒级。
关键词:EPA 现场总线模型协议栈驱动模块

Abstract:F irstly,th ec ircuitde signm ethodf orE PAi nterfacec ontrolerb asedo nA 791R4 0008a ndn on-PCI-busE thernetco ntrolerA X88796 is presented. Then,场analyzing the EPA communication model, the folowing are ofered: how to transplant u1P, an open source TCP/IP protocol stack writen Adam Dunkels, to meet the EPA standard; the key points of codes design in terms of the software driver module of AX88796; the thorough study on the core modules of EPA communication model, such as EPA services, socket mapping interface, time synchronization based on IEEE1588, EPA management information database, etc. Finaly, tested on the conformance and interoperation platform,the time synchronization precision at microsecond level can be reached at present.
Keywords:E PA Fie ldbus Model Protocols tack Driverm odule