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1、文献出处 ：Vidojkovic M. The Design and Implement of TCP/IP Protocol Cluster on AVR Singlechip J. Biomedical Circuits and Systems, IEEE Transactions on, 2014, 5(6): 523-533.The Design and Implement of TCP/IP Protocol Cluster on AVR SinglechipVidojkovic MABSTRACTWith the rapid development of the embedded
2、technology, research and implement of the Internet of things will be a new technology revolution, yet the implement of the Internet of things is on the base of the communication between the things. For this reason, realizing the function of communication between singlechip is particularly important.
3、 Based on the characteristics of the embedded microcontroller, we analyzed the traditional PC TCP/IP protocol, and appropriately tailored TCP/IP protocol cluster on the basis of the characteristics of embedded singlechip. At last, we realized the reduced TCP/IP protocol cluster suitable for embedded
4、 singlechip, on AVR singlechip platform.Keywords: The Internet of Things, Webit, Embedded System, TCP/IP Protocol, Ethernet1. IntroductionThe Internet of things means a kind of net that via infor-mation sense equipment such as FRID, infrared sensor, GPS, laser scanner and so on, in arranged protocol
5、, join up between anything and the Internet to communicate information and realize intelligent identification, tracing, monitoring, and management. The concept of the Internet of things is suggested in the year of 1999. It is the In-ternet communicated with things. It means two aspects: the first on
6、e is, the core and foundation of the Internet of things is still in the Internet, which based on, extending and expanding the Internet; the second one is, its client side extends and expands to anything, to make the in-formation exchanging and communication 1-3.With the rapid development of computer
7、 and network technology, Internet has become an important means of information transmission, more and more embedded equipments are necessary to achieve the Internets net-work 4-5. Relative to the PC,computing and storage resources of embedded systems are relatively limited; therefore to achieve all
8、the TCP/IP protocol cluster in the embedded singlechip is quite unrealistic. So that, in order to save the system resources and ensure the reliability of the system, under the condition of improving the per-formance of embedded system, its necessary to targeted modular simplify TCP/IP protocol.2. Ad
9、optive Equipment and Testing PlatformWebit is an overall solution that makes the equipments intelligent and networking. It is the new network equip-ment system structure with the elements of Internet and its basic idea is an independent, low-cost 3 W server embedded in equipment, to make the equipme
10、nt has in-dependent network intelligence.Webit is an embedded Internet product decided by Liaoning Provincial Key Laboratory of Embedded Technology by themselves. Webit 1.0 is successfully pass technical appraisal and the trademark registration in the year of 2000, and Webit 2.0 (Internet non-standa
11、rd electrical equipment access server) passed the appraising meeting of scientific and technological achievements held by science and technology commission of Liaoning province in May 2001. Considering that webit is A VR 8 bit singlechip, its storage unit is very limited, therefore its very importan
12、t to design a kind of TCP/IP protocol cluster suitable for the products.The performance of Webit 2.0 as follows:* Without depending on PC system structure;* Using Atmel AVR RISC processors;* User-defined Web pages;* User-defined CGI programs used to control;* 14 bit I/O interface (TTL level);* TTL l
13、evel UART supported 115200 bps;* 10 M Ethernet interface (RJ-45);* System programming (ISP);Overview of Ethernet controller chip RTL8019AS in Webit:RTL8019AS is a highly integrated Ethernet controller, it can simply answer plug and play NE2000 compatible adapter, which has two-fold and power decreas
14、echarac-teristics. Through the three-level control characteristic, RTL8019AS is the best ideal choice for network equip-ment GREEN PC in all already known things. The two-fold function can simulate send and receive the spread between twisted-pair and all two-fold Ethernet switches. This not only can
15、 make bandwidth stronger from 10 Mbps to 20 Mbps, but also avoid read muliaccess agreement because of Ethernet channel fight character. Microsofts plug and play function can alleviate user lower income and focus on the adapter resources, such as the input and output, IRQ, memory address, etc. How-ev
16、er, in special application without plug and play func-tion of compatibility, RTL8019AS support s JUMPER and JUMPERLESS options.In order to provide complete plug and play solution, RTL8019AS integrated 10BASET transceiver, and auto-examination function between AUI and BNC interface. In addition, 8 IRQ BUS and 16 basic addresses BUS provide comfortable e
