Embeded Web Server

In this paper, it researched the Embedded System Web Server. The system can visit the traditional test instruments through the TCP/IP network protocol remotely access to the Internet, the information of traditional test instruments can transmit through the Universal Asynchronous Serial Port to the system, then the remote client access the information through the system, so that we can truly monitore and control the system any time and any where. The system uses high-performance RISC processor S3C44BOX for system CPU, with external expansion of RAM and Flash, to construct the hardware platforms. The development of operating system shielding layer, and on this basis to achieve the levels scheduling mechanisms, transplant embedded real-time operating system Nucleus PLUS, and embedded TCP/IP network protocol stack Lwip to the hard platform,and achive application program.In hardware designment ,we use S3C44B0X which has a ARM7 core as system CPU, external expansion capacity of 2 M bytes of Flash memory AM29LV160 and capacity of 8 M bytes of SDRAM memory HY57V641620, use RTL8019AS as the network controller.When design software, in order to facilitate software development, first we developed the operating system shielding layer (Operating System Shielding), allowing the development of systems can be in the stable Windows platform, using good development tool Visual C++, when about finish the development, it will be convenient to transfer to the embedded system. In shielding layer above the operating system, level scheduling system designed to avoid frequent switching of the tasks because of the system performance loss. Then in the embedded systems hardware platform ,transplantat RTOS (Real-time Operating System) Nucleus PLUS and embedded TCP/IP protocol stack Lwip. Then, we develop the hardware drivers, to achieve system function. Finally, make summarizes and prospects about this paper.