毕业设计论文――函数发生器

基于单片机函数发生器系统设计系别信息工程系专业自动化/测控技术与仪器班级B141401学号B14140123姓名王景欣指导教师孙丽媛负责教师刘剑沈阳航空航天大学北方科技学院2015年6月沈阳航空航天大学北方科技学院毕业设计（论文）I摘要函数信号发生器是各种测试和实验过程中不可缺少的工具，在通信、测量、雷达、控制、教学等领域应用十分广泛。为了实验、研究方便，研制一种灵活适用、功能齐全、使用方便的信号源是十分必要的。当今是科技以及仪表设备高度智能化飞速发展的信息社会，电子技术的发展进步，给人们的生活带来了根本性的转变。单片机构成的仪器具有高可靠性，高性价比，在智能仪表系统和办公自动化中得到广泛应用，因此，基于单片机的函数信号发生器的普及是一种趋势。本系统是基于AT89C52单片机的函数信号发生器。采用AT89C52单片机作为控制核心，外围采用数字/模拟转换电路（DAC0832）、运放电路（LM324）、按键等。利用单片机设计的函数信号发生器具有编程灵活，功能更加多样等实际的优点。利用单片机设计的函数信号发生器能够产生正弦波，锯齿波，三角波，方波，并实现对频率的调节，以及液晶屏12864显示波形名称和波形频率，波形的切换和频率的调节都可以用按键实现，其设计简单、性能优好，可用于多种需要函数信号的场所，具有一定的实用性。关键词：单片机；DAC0832；液晶16824；LM324沈阳航空航天大学北方科技学院毕业设计（论文）IIAbstractFunctionsignalgeneratorisanindispensabletoolintheprocessoftestingandexperiment,thecommunication,measurement,arewidelyusedinfieldssuchasradar,control,teaching.Forconvenientexperiment,researchanddevelopaflexibletoapply,completefunction,easytousethesignalsourceisverynecessary.Today'stechnologyandinstrumentequipmenthighlyintelligenttherapiddevelopmentofinformationsociety,thedevelopmentandprogressofelectronictechnology,hasbroughtthefundamentalchangetopeople'slife.Singlechipinstrumenthashighreliability,highcostperformance,theintelligentinstrumentsystemandiswidelyusedinofficeautomation,asaresult,thepopularityoffunctionsignalgeneratorbasedonsinglechipmicrocomputerisakindoftrend.ThissystemisbasedonAT89C52MCUfunctionsignalgenerator.USESAT89C52singlechipmicrocomputerascontrolcore,peripheryadoptsdigital/analogconversioncircuit(DAC0832),theop-ampcircuit(LM324),buttons,etc.Usingsingle-chipdesignoffunctionsignalgeneratorwithflexibleprogramming,functionmorediversepracticaladvantages.Microcontrollerdesignoffunctionsignalgeneratorcanproducesinewave,sawtoothwave,trianglewave,squarewave,andtorealizetoadjustthefrequency,and12864LCDdisplaynameofwaveformandwaveformfrequencyandwaveformoftheswitchingfrequencyandadjusttheimplementationcanusebuttons,itsdesignissimpleandgoodperformanceadvantages,canbeusedforavarietyofplacesthatneedfunctionsignal,hasacertainpracticality.Keywords:Singlechipmicrocomputer;DAC0832;LCD16824;LM324沈阳航空航天大学北方科技学院毕业设计（论文）III目录1绪论...............................................................................................................................11.1课题背景和研究的意义.............................................................................................11.2函数发生器的分类.....................................................................................................11.3国内外发展状况.........................................................................................................21.3.1国内发展现状......................................................................................................21.3.2国外发展现状......................................................................................................21.4课题任务及要求.........................................................................................................41.4.1主要内容：..........................................................................................................41.4.2技术指标：..........................................................................................................42系统方案的设计...............................................................................................................52.1方案论证.....................................................................................................................52.1.1方案1...................................................................................................................52.1.2方案2...................................................................................................................52.1.3方案比较..............................................................................................................62.2系统总体设计.............................................................................................................63硬件设计...........................................................................................................................73.1主控单片机电路.........................................................................................................73.1.1AT89C52单片机介绍...........................................................................................73.1.2AT89C52单片机的标准功能...............................................................................73.1.3单片机的复位电路..............................................................................................93.1.4单片机的时钟振荡电路....................................................................................103.2波形产生模块设计....................................................................................................113.3显示模块的设计........................................................................................................113.6键盘显示模块的设计................................................................................................134软件设计.........................................................................................................................144.1开发工具介绍............