基于LPC1758的波形采集存储与回放系统设计  

Design of Waveform Acquisition,Storage and Playback System Based on LPC1758

作　　者：罗乐[1] 李可为[1] 笪贤进[1] 

机构地区：[1]成都工业学院通信工程系,成都610031

出　　处：《成都电子机械高等专科学校学报》2012年第3期32-35,共4页Journal of Chengdu Electromechanical College

摘　　要：为解决波形采集、存储及回放的问题,详细介绍其基本原理、电路及程序设计。系统采用电压跟随器将信号衰减后经低通滤波器送入A/D转换器,完成数据采样,同时实现阻抗匹配并达到隔离效果。采用高性能低功耗LPC1758微处理器作为主控芯片,实现数据采集和处理,利用LPC1758微处理器自带的IAP技术实现数据转存至片内FLASH。通过异常数据抛除法来准确地找到采样数据的相临最小值,从而准确计算信号的周期。采用跳变沿算法实现对波形形状的判断。将D/A转换后的信号经过后级处理,最后送入显示器实现波形回放。整个系统操作简便,达到了较好的性能指标。The paper introduced the design principle of a waveform acquisition,storage and playback system,and discussed the circuit and program design in detail.In the system,a voltage follower was used to transmit the attenuated signal for A / D converter and finish sampling.At the same time,impedance matching was realized to achieve isolation effect.High performance low power microprocessor LPC1785 was used as the main control chip to realize data collection and processing.In the system,LPC 1758 microprocessor with IAP technology was also employed to realize data transfer for on-chip FLASH.Through the anomaly data behind the division the sampling data of neighboring minimum value were accurately located,so as to accurately calculate the signal cycle.Edge jumping algorithm was used for waveform shape judgment.The D/A conversion signal after processing was transmitted to the display so that waveform playback could be realized.The whole system has the advantages of simple operation,friendly interface,and good performance.

关 键 词：信号处理 IAP 波形回放 FLASH 低通滤波 

分 类 号：TP399[自动化与计算机技术—计算机应用技术]