Design And Study Of Autonomous Download System Based On Embedded Platform

With quick development of computer technology and internet network,download required materials from internet has been becaming people's one more important component in daily work and life.It is a technique difficult problem in which the attention has been paied that how to implement downloading faster and better.Lots of PC are used as material downloading terminals at present,BitTorrent(BT) downloading method is restricted in some extent by using PC of applications in some special situation.The quick development of embedded technique provides the download difficult problem for speediness and stabilization with a good solution. Integrating BT with excellent performance for downloading into embedded system has a good application future in some special situation.As a part of《Passenger Information System》(a sub-project of《the study of orbital traffice Electronic equipment base on embedded system(NO.06DZ15003)》that support by Science and Technology Commission of Shanghai Municipality).Base on the research goal,the mainly work and innovation of this thesis can be stated as follow:1) The present situation of embedded ADS(Autonomous Download System) have benn analysed and researched.Meanwhile,some general information about embedded system and Peer-to-Peer technology background have been reviewed.2) After analyzing the functional requirement of this system,a total solution of the system and software flowchart were proposed,include the design of hardware circuit and PCB,According to this circuit,this thesis also prot U-BOOT and LINUX to this arm platform.3) The design of BT download software which base on BT protocol was introduced,then this paper give another better strategy that connect to BT peer.After precise test,this new strategy can accelerate the speed of download between sub network.4) In order to resolve the problem in the traditional BT protocol,the thesis add a DHT arithmetic to this system.Use distributed technology to resolve the problem that if Track server destroy BT net will stop.The system that described in this thesis have been used in our project.