Embedded Systems, Wireless Lan File Transfer Protocol Design And Realization

Because of the widely use of embedded system on many occasions, growing net access demand and the qualities of embedded system like portable and low cost. So how to use the limited resources of embedded system to transfer data faster and more reliable that used in the WLAN, become a current research focus. The key of research is redesign a data transfer protocol for WLAN. Because of open-source and configurable, Linux has gradually become the mainstream in embedded OS. Taking into account the above, combining the WLAN networks and embedded system, it will bring new applied value of WLAN embedded euqipment to design a file transfer protocol for WLAN that can run in the embedded system, transfer data faster and more reliable.This paper is unfolded rounding the research of Embedded File Transfer Protocol for WLAN (EM-FTP for WLAN) based on embedded system. The research background and status is provided in paper. The conception and feature of traditional protocols for WLAN are given. The design issues are raised and the Embedded Linux OS is summarized. The paper elaborates the working principle including sending and receiveing in detail and gives the message-format of the protocol. The finite state machine is given in order to verify the protocol. The Embedded development platform is constructed for realize the protocol. The related principle is introduced. Each processing flow chart and parts of kernel code. The protocol is tested in appropriate circumstance. The tested items include sending, receiveing, reliability and protocol expense. The result indicates that this protocol, has a high efficiency of sending and receiveing. Moreover, this route protocol cost small bandwidth and take a little of CPU and memory resource.