Research And Design On Information Display System Of On-Board Based On Embedded Linux

Information displaying system on-board based on Embedded Linux is an important equipment which the drivers communicated with the train. It supplies reliable secure informations for drivers' operation and the train's safe operation. So it is clear that there is important meaning on the research of theoretic method and technological realization of the on-board display.According to the needs of the information displaying system on-board based on Embedded Linux, the author used RTAI real-time core to improve the real time performance, and used the MiniGUI to design the man-machine interface,then combine them to finish the design of the information displaying system on-board.In this paper, we chose PC/104SX-340 as the hard platform, and then construct Embedded Linux system, such as Linux core modules, the principles how to choose core modules, how to construct an Embedded Linux file system by using the busybox tool, how to design the bootloader program in the Embedded Linux(Grub or LILO). Then we analyse why the Linux system cannot realize the real time performance and that their support to the real time, compared two ways to realize the real-time performance in Linux system, one is that changing the Linux core directly to realize the real time performance, such as KURT, the other is that two cores idea-increasing a special core for real-time core, such as RTLinux and RTAI Linux. In this paper, the author chose the second way, used RTAI to improve the real-time performance of Embedded Linux system, after that we tested the real-time performance the RTAI Linux, and compared with the standard Linux. Then we use RTAI to design the realtime task of the Information Display System ono-board. The graphical user interface of the PC Linux is too voluminous to apply to the on-board for display, the author introduced several kinds of Embedded GUI system, such as OpenGUI, QT/Embedded, Microwindows and MiniGUI. Then analysed and compared them, the author chosed the MiniGUI which is a free software designed by Chinese and used it to finish the design of the graphical user interface of the display. Finally, we copied the MiniGUI resource files and application programs to embedded Linux system to finish the design of the Information Display System on-board based on Embedded Linux.