基于EPA的嵌入式控制器軟件協議棧實現
Implementation of EPA-based Embedded Controller Software Protocol Stack

摘要:首先提出基于AT91R40008與非PCI總線以太網控制器AX887%的EPA接口控制器硬件電路設計方法。之后在深入剖析EPA通信模型的基礎上，重點闡述了如何移植由Adam Dunkels編寫的開源TCP/1P協議棧UIP以滿足EPA協議標準;針對AX887%的軟件驅動模塊，重點指出其驅動代碼設計的關鍵點;就EPA通信模型的核心模塊，如EPA服務、套接字映射接口、基于IEEE1588的時間同步、EPA管理信息庫等的實現進行了深人研究。經過EPA一致性和EPA互操作性等測試平臺測試，時鐘同步精度目前可達到微秒級。
關鍵詞:EPA 現場總線模型協議棧驅動模塊

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,場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