【作者】 潘健；

【导师】 冯介一；

【作者基本信息】 湖南师范大学 ， 计算机应用技术， 2008， 硕士

【摘要】 随着网络时代的深入,Internet已经成为重要的基础信息设施,越来越多的设备需要接入Internet,射频IC卡系统就是其中之一。射频IC卡系统不能便捷连入Internet,其信息也不能及时更新。因此,本文拟选择8位单片机加精简TCP/IP协议栈的方法来加以解决。嵌入式Internet中的关键问题之一是其实现成本问题,8位单片机虽然只支持简化的TCP/IP协议及其他一些相关协议,但它们在系统成本方面具有较大优势,且8位单片机在各种电器设备中使用广泛且价格低廉。本文就从普通8位单片机AT89S51出发,重点介绍了下面三方面的工作。首先,对嵌入式Internet技术进行了介绍与比较,分析嵌入式TCP/IP协议的特点和实现要求,针对射频IC卡系统的特点,详细论述嵌入式TCP/IP协议简化的思想。其次,对硬件系统和软件系统进行了具体的设计,给出了硬件系统的设计原理图,着重讨论了网络接口卡RTL8019AS的数据发送和接收工作原理,并对整个嵌入式TCP/IP所用到的协议ARP、IP、ICMP、UDP进行了细致的分析。最后对设计内容进行了仿真测试,测试表明,本设计中研究的嵌入式以太网接入系统达到了最初的设计目标,可以实现数据的以太网传输。最后对本文的内容做了总结,并提出了一些研究展望,期待在以后的研究中完善。更多还原

【Abstract】 With the development of network era, Internet has become the most important foundational information infrastructure, so more and more devices needed to be connected with Internet, Radio-frequency system is one of the devices. The aim of this thesis is selecting the measure of 8 bit processor with simple TCP/IP protocol to solve the problem that the message can’ t be updated at any time due to the Radio-frequency system can’ t be connected to Ethernet.One of the key points about Embedded Internet Technology are cost efficient, 8 bit processor, supporting simplified TCP/IP protocols and other related protocols, although the TCP/IP stack in these applications is not perfect, these equipments can work pretty well, for its low cost, which is widely used by different electric instruments. In this thesis, the realizing Embedded Internet technology based on 8-bit processor has been studied in detail. First, the Embedded Internet, character is lies and request of implement on TCP/IP stack are introduced and analyzed, the methods of simplifying full TCP/IP stack according to the Radio-frequency system are studied. And then the hardware system and software system we designed are given in detail , the circuit diagram of hardware system is given, principle of sending and receiving data of RTL8019AS is discussed mainly, also, TCP/IP protocols, which is applied by the whole embedded system, such as ARP, IP, ICMP and UDP, is analyzed at length. At the end of thesis, the programs are emulationally tested, the results showed that the system could process data according to network protocol, and achieve initially aim.The contents of this thesis summarized at last and some of problems about Radio-frequency system needed to be studied are put forward, with expecting that can be solved in the future.更多还原