| In recent years,with the economic development,China’s transport industry has also made great progress.At present,China has built a thorough road network and the city of intelligent traffic construction is also in full swing.Traffic guidance screen is an important information window on the highway and intelligent transportation system,it’s control card program often needs to update.In the past,the upgrade operation mainly relys on the staff to manually replace the control card.This operation not only needs to spend a lot of manpower and material resources,but also has a great impact on traffic.Therefore,a remote wireless upgrade system can be a very necessary solution.The remote upgrade system designed in this paper is composed of two parts:control program and embedded hardware.The control program is a PC-side software,it runs in the.NET Framework 4.0 environment.The embedded hardware is part of the control card in the LED displayscreen.The wireless communication between the control program and the embedded hardware uses China Unicom’s 4G network.The main work of this paper is to design a set of remote upgrade system.for traffic guidance mark’s application program.Finally,the functions of the whole system have been realized through code.This paper mainly introduces the BootLoader program in the embedded hardware,the communication protocol used between the control program and the embedded hardware,the design idea and data processing and sending part of the control program,AES encryption technology what used during the system’s communication and so on.The design results of this paper have been formed products,used in the actual urban traffic and highway traffic guidance signs.At present,the user reflects that the remote upgrade system completes the scheduled functions,and works well in work environment.Besides the remote upgrade system has put into use,the relevant research and development work has not stopped,we are optimizing it continuously. |
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