基于WIND NET框架的PPP同步串口通信的设计与实现

当今网络发展迅速,异种设备互联的需求也日益显著。针对各种形式网络路由设备互联的需要,选用开放标准的PPP协议作为链路层协议,介绍了基于VxWorks操作系统的WIND NET PPP协议栈,分析了PPP协议建立连接的基本流程以及协议帧封装格式。在此基础上,选择利用MPC8280通信处理器设计开发板,搭载嵌入式VxWorks操作系统,修改基于VxWorks操作系统的WIND NET PPP协议栈源码,使适用于同步串口数据通信,利用SP3508多协议接口芯片完成开发板与目标路由器之间的接口协议转换操作,实现了互联互通。最后给出了方案的可行性验证,测试结果表明:通信畅通,连通状况良好,可靠性高。

Design and Implementation of PPP over Synchronous Serial Interface Based on WIND NET Framework

Due to the rapid development of today＇s network,the requirements of interconnection between different devices were increasingly significant.PPP protocol was selected as the link layer protocol to solve this problem.WIND NET PPP protocol stack based on VxWorks operation system was introduced. PPP frame structure as well as the basic process of PPP protocol when establish a connection was ana- lyzed then.On this basis,chose MPC8280 communication processor to design test board equipped with embedded VxWorks operating system.WIND NET PPP protocol stack based on VxWorks operation sys tem was modified to make it suitable for data communication over synchronous serial interface.Chip SP3508 was used to complete interface protocol conversion between test board and target router.Inter operability between them was achieved then.Finally,the feasibility of the solution was verified.The test re suits showed that：this solution worked well and had high reliability.