The Design Of The Embedded Queuing System Based On Linux

With the development of information technology, queuing system has changed dramatically. Queuing system gives people great convenience, eliminating the pain of standing line. But there are still shortcomings, for example there are scalpers scalping, and not accessing to the Internet,and difficult to upgrade products.For the problems, we apply for scientific and technological projects in Wuhan.Firstly from the research background, The paper analyzed the significance of the project and the domestic and international research status, then proposed system solutions. The queuing system is divided into the server and the display window. The server is the ARM9 platform equipped with Linux operating system. Display window is composed of LED display and the key box,controlled by ARM7 and scm respectively. Display and keypad communicate through the server. At last paper designed clients and staff work flow,and proposed frame format In this system platform.Secondly, begin detailed design of the display window. The paper select the appropriate display driver chip driving LED matrix ranks, using SPI communication interface is responsible for ARM7 and the LED display matrix communication. Button box read external key value with microcontroller. Both display and keys box communicate with the server through the RS232 serial port. In terms of software,the paper design the data structure and communications and display software module according to the workflow.Thirdly, constructe the ARM9 and USB camera core server system. After Linux operating system and software interface designer QT cross-compiler environment was installed on the PC, the paper design data structure and build server communication frame transmission and queuing ticket number management software, according to the customer workflow. The system capture image using standard V4L interface, and display acquisition image in QT.Finally, start queuing system, server successfully captured and displayed the image, and communication is also normal,which verify the correctness of system design.