多通道模拟信号采集显示装置设计

Design of Multi-channel Analog Signal Acquisition and Display Device

针对工科基础课程实验过程中存在多路信号同步采集显示的实验需求,基于国产FPGA厂商推出的SparkRoad-V开发板,设计并实现了7通道信号采集装置,并通过VGA显示器进行波形显示。首先,分析电子技术实验过程中待测信号参数特征和EG4S20BG256芯片内置ADC IP核功能特点,基于Tang Dynasty(TD)开发工具定制波形采集所需的RAM和ADC IP核,以及汉字显示所需的ROM IP核;然后,基于Verilog设计VGA显示驱动文件、数据流控制文件设计了VGA显示界面区域划分方式;最后设计顶层结构文件,将上述IP核和驱动控制文件进行系统集成。测试结果表明,汉字显示32*32像素、信号波形显示分辨率256*256像素,显示效果准确无误,达到了设计要求。该显示装置作为自研电子技术实验教学辅助工具,既能解决多通道实验信号采集显示的实验需求,又能够帮助学生体验国产FPGA性能、特点,有利于激发学生基于国产FPGA进行设计创造的热情。

Aiming at the demand of synchronous acquisition and display of multi-channel signals in the experimental process of basic engineering courses,a 7-channel signal acquisition device is designed and implemented based on the Sparkroad-V development board of domestic FPGA manufacturers,and the waveform is displayed by VGA display.Firstly,the characteristics of the signal parameters to be measured and the features of the built-in ADC IP core in EG4S20BG256 chip are analyzed.Based on Tang Dynamics(TD)development tool,the RAM and ADC IP core for waveform acquisition and ROM IP core for Chinese character display are customized.Then the VGA display interface area division mode is designed,based on Verilog design VGA display driver file,data flow control file.Finally,the top-level structure file is designed,the above IP core and driver control file for system are integrated.The test results show that the Chinese character display is 32*32 pixels and the signal waveform display resolution is 256*256 pixels.The display effect is accurate and meets the design requirements.As a self-developed electronic technology experiment teaching assistant tool,the display device can not only meet the experimental requirements of multi-channel experimental signal acquisition and display,but also help students experience the performance and characteristics of domestic FPGA,which is conducive to stimulate students'enthusiasm for design and creation based on domestic FPGA.