Development And Application Of Dataacquisition System Based On Embedded Linux And Qt/E

With the constant progress of science and technology, comuter software andhardware technology obtained fast development, application of the embedded systemis becoming more and more wide. And embedded products with its compact, protable,intelligent, practical characteristics such as more and more get the favour of people, tobe used in various industrial control occasions, data acquisition system is one of theimportant application. At the same time, with the development of science andtechnology, the demand of the data acquisiton system performance index, such assampling speed, precision, control mode, etc., is higher and higher; meanwhile,people also pursuit in real-time dynamic diaplay of data in order to facilitate controlof the industrial field. So design with friendly graphical user interface, the ability ofhigh speed data acquisition and transmission, convenient operation of the embeddeddata acquisition system has high practical value and research value, what this paperdiscusses is just how to construct such a system and its application.The paper first discusses the development cource and application status of dataacquisition; then after summarizing the development cource of embedded system,analyze the definition and feature of embedded system; upon that study Linuxoperations system and the graphical interface development library Qt/E; finallypropose a design proposal of data acquisition based on embdeded Linux operationssystem and Qt/E. The hardware circuit of data acquisition system is made up ofcentral control module and the front-end acquisition module, the core control modulebased on S3C2440A processor as the core of the embedded platform, is mainlyresponsible for the opening of data acquisition, process control of data acquisition,data receiving and real-time dynamic display and so on core control task; thefront-end acquisition module mainly complete the analog-to-digital conversion, datatransmission task, which is made up of the signal conditioning circuit, A/D conversioncircuit and CPLD control circuit.On the basis of the principle of each function module clearly the paper firstcompletes the circuit principle diagram and PCB design of the system; and then givesthe method to transplant Bootloader, Linux kernel, Qt/E library and the method tomake the root file system, through which building the basic software system of theembedded platform; finally realizes the character device driver development,completes the upper data acquisition and Qt graphical user interface applicationdesign.Paper finally summarizes the work, then analyze the advantages of system hasand what has yet to be improved in order to perfect the data acquisiton system.