Research And Design Of Signal Machine Control System Based On The Technology Of ARM And Linux

Traffic is significant to the people who live in the modern city, which is also the important mark when measuring the progress of the urban civilization. The intersection in the city is fundamental unit of the urban road network, and the bottleneck to the urban traffic as well. The traffic capacity of the intersection produces a direct effect on that of the urban road network. However, under the limitations b rought by the specific situation of our country and the complex urban traffic, the currently available signal machines haven’t fully functioned, which leads to the serious traffic congestion. In order to solve the problems above, the paper lucubrated the embedded OS based on Linux, the ARM11 microprocessor S3C6410, ActiveMQ message server and the signal machine main control system based on the Xml communication protocol, then proposed the design and implementation schemes of the software and the hardware.The paper firstly analyzed the operating principle of the signal machine main control system, and then confirmed the functional requirements of it, including the storage and the implementation of the traffic signal control scheme, the network communication of the ActiveMQ message server based on the Xml protocol,the automatic time adjustment and so on. According to the practical needs and the related provisions of the Ministry of Communications, the paper selected the network communication technology and the communication protocol of the signal machine main control system.Then on the basis of the functional requirements, the paper completed the overall design and the detail design for the hardware of the signal machine main control system, mainly including type selection of the microprocessor and the storage device, the design of the peripheral circuit for the Ethernet and so on. O n the basis of the hardware design, the embedded Linux OS, hardware device modules and the third-party libraries were transplanted into the system.Finally, the paper designed the functional software for the system based on the module design thoughts, including the message service software, the control module software, the additional modules software and so on, realized the cooperative work among modules using the non-blocking and multithreading, and finally realized all the functions of the system.The SI, module testing and the integration testing on the signal machine system indicated that the signal lights controlling scheme can be operated steadily on it, and the system can switch the control schemes according to the different time sections, carry out the Internet communication with the ActiveMQ message server, store the signal machine control schemes in a long term and so on. The system possesses a higher practical value, which is also a worthy deep exploration to the signals light controlling in the city intersections.