基于CPLD的数据采集系统设计

Design of Data Acquisition System Based on CPLD

本文介绍了开发虚拟仪器的过程，对利用虚拟仪器技术及VisualBasic软件构建示波器的软、硬件进行了研究，使用高性能的可编程逻辑器件（CPLD）实现数字电路的控制，并使用该器件基于串口实现了一种新的数据采集系统。试验结果表明，利用虚拟仪器技术构建的示波器不仅能实现传统示波器的基本功能，而且能够存储、再现、分析和处理波形，系统的灵活性更大，有利于用户自定义仪器的功能，从而可节省购置费用。

In this paper, the whole procedure of developing the virtual instrument is introduced, the software and hardware of structuring the oscilloscope by using virtual instrument technology and Visual Basic are studied, and the control of digital circuits is realized by applying the high-performance programmable logic device （CPLD）, and a new kind of data acquisition system is achieved based on the CPLD and serial port as well. The experiment result shows that the virtual instrument technology -constructed oscillo- scope not only can realize the fundamental function of the traditional oscilloscope, but also can store, reproduce, analyze and dispose the waveforms. The system has more flexibility, it is conducive to define the instrumental function by user＇s own, and thus the pur- chase expenses can be economized.