LwIP Transplantation And Application Research Of Embedded WEB Based On Cortex-M3

With the rapid development of embedded and network technology, the demand for embedded devices to the Interent as a medium for data exchange becomes stronger. And the TCP/IP protocol stack is the specification of the current network traffic and most network devices support this specification. Therefore, in order to allow embedded devices access the Internet to communicate each other at any time and place, to achieve the streamlined and efficient TCP/IP protocol stackis an essential step on the embedded device.The embedded WEB is based on TCP/IP protocol stack. Using the embedded WEB-technical, users can acquire data easily, remote monitoring to remote embedded devices on the local computer through the Internet, and display directly embedded equipment condition in the client browser.In this paper, considering the needs of applied research, the hardware platform is equipped with ARM Cortex-M3core STM32F207IG processor and the DP83848C network chip. On this basis, this paper analysised the embedded operating system μC/OS-Ⅱ and transplanted it on Cortex-M3platform. And in order to increase the network communication of the embedded devices, this paper transplanted the embedded TCP/IP protocol stack LwIP, analyzed in detail the main protocol ARP, IP, ICMP, UDP and TCP and given the function diagram.Lastly, based on the LwIP protocol stack, this paper achieved the Get method and the Post method of the HTTP protocol and built a traffic signal control system based on B/S structure with the use of the embedded WEB technologies, including CGI, SSI and AJAX technology.