Research On Embedded Ethernet Devices Connecting Internet

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.