Design And Implementation Of Wireless LAN Access Based On PXA270 Platform

The high-speed growth of Embedded Technology and products was a marked feature of the global IT industry in recent years, the requirements of informationization and networking of Embedded Systems are becoming more and more prominent with the maturity of Internet technology and the improvement of bandwidth technology. As supplement and extension of wired network, the Wireless LAN combination of high-speed data networks and mobile applications effectively.To satisfy the requirement of the networking and personalization, Embedded terminal equipment Integrating Wireless LAN access functionality into Embedded Systems, which is the hot research topic of design, application and development.of Embedded Systems in the future, Embedded terminal equipment will be a combination of the high-performance and low-power hardware platform, the software platform based on independent operating system, and the broadband wireless network.Based on this research background, this paper discourses upon how to structure a platform which support of conducted the Wireless LAN application research based on Embedded Systems.Firstly, this paper determine structure a hardware platform based on IEEE802.11b and Windows CE 5.0 through analyzing the component, the architecture and the technology standard of Wireless LAN, and the Embedded Processor and the Embedded Operating System. At the same time, this paper puts the emphasis on the analysis of Windows CE 5.0's hierarchical structure, memory management mechanism and its support to the 802.11 Wireless LAN.Secondly, this paper build a hardware platform which take advantage of Embedded Systems development platform PXA270EP's rich interface resources to integration with a USB interface wireless network card module that based on VT6656 and 802.11b and expanded input module that include mouse and keyboard. Thirdly, this paper made a deep study of key elements of BSP which include porting of Boot Loader, development of OAL and development of device driver, and so on. Referring to the BSP code of the standard development board of Intel MainstoneⅡwhich provide by Windows CE 5.0, and building a BSP of the hardware platform of system.Finishing building, compiling and debugging of the kernel Embedded Operating System Windows CE 5.0 in the integrated development environment Platform Builder, and porting of wireless network card module drivers. Build an Embedded Development Environment based on Windows CE, and porting of Operating System Windows CE 5.0 successfully.Finally, testing on Wireless LAN access of system paltform which including functional testing and performance testing.After testing, verify the design of the study is reach the expected objects, laying a good foundation in conducted the Wireless LAN application research based on Embedded Systems.