【作者】 王兰；

【导师】 王景存；

【作者基本信息】 武汉科技大学 ， 计算机应用， 2003， 硕士

【摘要】 随着时代的发展，新兴的电子应用系统——嵌入式系统，以其明显的体积小，价格低，专用性能高的优势，越来越受到人们的重视和亲睐。当今社会的另一主流趋势是信息共享．如何将两者结合起来已成为当今信息界关注的焦点。 本文首先比较了网络信息共享在计算机应用领域和电子应用领域中的现状。针对后一领域在这方面的不足，以及人们对此领域能具备这一功能的需求和期盼，提出了如何增强电子应用领域网络信息共享能力的办法——将嵌入式系统接入Internet。在给出了嵌入式系统的主要构成和Internet的定义之后，本文还讨论了实现这一设想的可行性，具体办法和关键问题。考虑到现有的实际条件，各种办法的优缺点，以及实现的相似性，本文最终提出了通过以太网将嵌入式系统连入Internet的设计方案。 OSI网络模型是网络通信系统设计的依据，本文针对嵌入式系统的特点，对OSI网络模型的各个层次及每层的实现协议进行了适当选取，并详细介绍了嵌入式系统上网最小开销系统的几个必不可少的协议。RTL8019AS作为以太网的核心网络接口控制芯片，是硬件上嵌入式系统和Internet的关键接口部件。它完成嵌入式系统网络数据的收发功能。 在对网络协议和网络接口控制芯片进行充分分析和研究的基础上，本文就本次设计所涉及的两个子系统——嵌入式系统和远程监控计算机系统，分别给出了详细的实现方案。特别是对嵌入式系统的软件部分，TCP／IP协议族的合适选取，每个必不可少协议的适当裁减，以及对某些特殊处理(如路由问题，嵌入式系统在网络中的角色问题等等)都做了详尽阐述。 在本文的最后，以图形的直观方式展示了系统的运行结果。并应用第三方抓包软件Sniffer检验了整个系统的网络通信过程。更多还原

【Abstract】 With the times development, a burgeoning electronic application system, embedded system, is being attached more and more importance, for its obviously little volume, low price, and excellent special performance. Today’s another main trend is information sharing. How to combine these two technologies has been a focus in today’s information field.The actuality of network information sharing in both computer application field and electronic application field is compared in this paper. Aiming at the scarcity, the requirement and the expectation, a measure to improve the ability of network information sharing in electronic application field is put forward, which is connecting embedded system to Internet. After showing the main structure of embedded system and the definition of Internet, the possibility, realization measures and key problems of this assumption are also discussed in this paper. Considering the reality, the similarity, the advantages and disadvantages of all measures, a design plan of connecting embedded system to Internet through Ethernet is put forwarded at last.Network communication system is designed according to the OSI network model. In this paper OSI network model’s layers and each layer’s protocols have beenembedded system and long-distance supervising computer system, is showed in this paper. Especially for the embedded system’s software part, the proper filtration of TCP/IP protocol family, the curtailment of each absolutely necessarily protocol and some special disposal (such as routing problem, the role of embedded system in network etc.) are all be discussed in detail.In the last part, the whole system’s running result is showed graphically. And the whole network communication procedures are checked by Sniffer, a 3rd part network data catching software.更多还原