The Design Of Embedded Gateway Based On ARM9

In recent years, Ethernet/Internet and other network is applied gradually and widely in the domain of communications and automation. Represented by TCP/IP network transmission communication protocol, the open network communication technology with higher maturity is permeating into several of automation systems, connecting and controlling the equipments. While it is usually adopts other protocols of the embedded device of industrial control and communication. How to achieve the remote control for the embedded device and remote transmission for the data has become an urgent problem. A scheme is proposed based on this factual significance in this paper.In this paper, the definition, significance of research and trend of development of the Embedded Gateway is introduced, firstly. Then a solution is brought forward and achieved for an embedded device access to Ethernet based on the analysis for the technical requirements of Embedded Gateway. The following contents are detailedly introduced in this paper, including the overall design framework, the hardware and the design platform, Embedded Network Programming, Operating System kernel revisions, as well as the porting of the Operating System. The network programming and the porting of the Operating System is the focus of the entire design.In the design, 32-bit ARM920T processor S3C2440A as the kernel chip and CS8900A as the network interface chip are selected to exploit Embedded Gateway, and it needs to be run on the Embedded Operating System, which is the difficulty and different from the low-end microcontroller. The author do much work on these aspects: much research are made on the boot loader of the Embedded Operating System, the tailor and porting of kernel, file system and the configuration of the driver, and so on. The main part of the program on the network is to finish the program of communications on the TCP / IP protocol application layer. In specific implementation, it adopts SBC2440B which is produced by the Friendly Arm of the company as a whole design of hardware development platform, and the software platform is the Embedded Linux Operating System. The characteristic of small size and real-time high is achieved by cutting the Linux kernel. Finally, communications of network interface are achieved by system debugging, and a solution for embedded devices connection to the Internet is provided.