Design of Multi-channel Analog Signal Acquisition and Display Device
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 devel-opment 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 dis-play 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 in-tegrated.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 ac-quisition 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.
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