Four-channel Digital Oscilloscope, Data Processing And Display Module Software Design

We do a research on the project of 2GSPS Four-Channel DSO. The main content is the design and implement of some parts of software modules in this project.The Four-Channel Digital Storage Oscilloscope is designed basing on the core of embedded digital processor (ADSP-BF531), the framework of DSP and FPGA, and the software of which is developed in the Visual DSP++ 5.0 IDDE of ADSP-BF531.Following are the details of these modules.Display module: This module includes the principle and implementation of PPI driving; the design layout of graphic interface; the display modes of characters, menu and waveforms.Data processing module: This module includes many processing modes of waveform data. They are mathematical operation, pass/fail test and recording and replaying of the waveforms.Configuration and status memory module: This module uses I2C storage device to keep the basic status parameters of oscilloscope and the menu status. In this module, we mainly discuss the software and hardware design method of the I2C chip and the application in the oscilloscope.Dual-timebases: Dual-timebases is a new method of sampling and display of waveforms. The oscilloscope sample one waveform in two different timebases while displaying it in two different windows. This way can make users observe the details of the waveforms better. In this module, we will expatiate the implementation principle of dual-timebases and the application in the oscilloscope. .