基于单片机与FPGA的等精度频率计的设计.doc

摘要
摘要:根据等精度测量的原则,提出了一种基于FPGA的等进度数字频率计设计方案。介绍了等精度的多周期同步测频原理,并对其测量精度和特点同传统测量方法进行了对比分析,证明了多周期同步测频方法的优势。
基于周立功公司生产的EasyFPGA030开发板,,采用硬件编程语言VerilogHDL编写计数器模块,除法器模块,并且用Synplify进行综合,ModelSim进行仿真并且给出它们的仿真结果,Designer进行布局布线,利用FlashPro和并口线下载到开发板上。
利用AT89C51单片机与共阳极LED数码管对测量结果进行动态显示。利用74LS244三态缓冲器和三极管对电流进行放大,使得LED数码管更亮。利用74LS14集成施密特触发器的反相器进行信号的整形。
经过仿真下载验证,能够实现等精度测频功能,频率测量范围1Hz~1MHz,证明该设计方案切实可。
关键词:等精度;频率测量;FPGA;VerilogHDL;Libero。
Abstract
Abstract: According to the principle of measurement etc precision, proposed based on FPGA digital frequency of design project progress. Introduces the principle of frequency measurement with etc precision and synchronous, parative analysis the measurement precision and features with the traditional measuring method. With more than proved step frequency method with etc precision and synchronous has periodic advantage.
Based on the pany production EasyFPGA030 development board, in integrated software development environment, using hardware VerilogHDL programming language to write counter module, divide module. With Synplify synthetically, with ModelSim simulation giving simulation results, Designer layout wiring. Using FlashPro download the design to development board.
Use MUC and LED digital tube to show the measurement results. Use 74LS244 tristate buffers and transistor to amplify current that LED digital tube brighter. Use 74LS14 Schmitt toggle integration to plastic signal.
Through simulation and download to the development board, can achieve the function of frequency measurement etc precision, Frequency measurement range from 1Hz to 1MHz. Proof of this scheme is feasible,
Keywords: equal precision, frequency measurement, FPGA, Libero, HDL
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目录
摘要 I
Abstract II
第1章绪论 1
课题背景 1
课题来源、目的和意义 2
本文结构 3
第2章主要研究内容 4
引言 4
数字频率计主要技术指标[4] 4
常用直接测频的方法 5
等精度频率测量算法 5
等精度测量误差分析 6
总体设计 7
本章小结 7
第3章 FPGA设计 9
引言 9
计数器模块 11
分频模块 1