基于MSP430单片机的信号源

I基于MSP430单片机的信号源学生姓名：学生学号：院（系）：电气信息工程学院年级专业：指导教师：助理指导教师：二〇一五年五月III摘要由于科学技术的发展和现代科学研究发展趋势，信号发生器已经成为很多研究和测试行业不可或缺的工具。已广泛应用于生产实践和科学技术的信号源可称为信号振荡器和信号发生器，能够产生多种波形,如三角波、锯齿波、正弦波、方波。函数信号发生器广泛应用于电路实验和测试设备领域。在通信方面，广播电视系统中，例如需要的高频（射频）发射无线电波，音频（低频率），视频信号或脉冲信号调制的载波，就需要产生高频振荡。在工业、农业、生物医药等区域，如高频感应加热，熔化，淬火，超声，磁共振成像，我们需要强度或大或小，或高或低的频率的振荡器。该系统以MSP430F149单片机为控制核心，利用单片机内部的DAC芯片，合理选择需要的输出波形（正弦波，三角波，方波，锯齿波）。此过程的关键是中断，然后设置其他键控制输出波形,主要是调节振幅和频率,然后通过单片机控制LCD1602完成显示。生成波形通过MSP430单片机执行一个波形生成程序，D/A转换器输入端按照一定的规则发出数据,再以D/A转换电路获得相应的输出电压波形。学习板MSP430键盘控制是经过软件编程来选择不同的输出波形,不同的振幅和频率的电压波形,根据不同按钮被按下实现。这个方案是一种电路原理相对简单,比较容易实现和调试。关键词:MSP430，信号源，信号发生器，LCD1602ABSTRACTIIIIABSTRACTWiththedevelopmentofscienceandtechnologyandmodernscientificresearch,thesignalgeneratorhasbecomealotofresearchandtestingindustryindispensabletools.Thesignalgeneratorandthesignalsourceoroscillator,hasbeenwidelyusedintheproductionpracticeandscienceandtechnology.Allkindsofwaveformcanbeusedtoexpresstrigonometricequation.Canproduceavarietyofwaveforms,suchastrianglewave,sawtoothwave,squarewave(withFangBo),thecircuitiscalledsinefunctionsignalgenerator.Functionsignalgeneratoriswidelyusedincircuitexperimentandtestequipment.Forexample,incommunication,broadcastingtelevisionsystem,requireradiofrequency(HF)emission,wheretheradiowaveisthecarrier,theaudio(lowfrequency),thevideosignalorpulsesignalcarryout,weneedtoproducehigh-frequencyoscillator.Inindustry,agriculture,biomedicalandotherfields,suchashighfrequencyinductionheating,melting,quenching,ultrasound,magneticresonanceimaging,allneedpowerorbigorsmall,orhighorlowfrequencyoscillator.ThissystemusesMSP430F149microcontrollerascontrolcore,usingDAmicrocontrollerchipbuilt-in,tologicalchoicetooutputwaveformbykeyinterrupt(sinewave,trianglewave,FangBo,JuChibo),theamplitudeandfrequencyandthensettheotherkeystocontrolthewaveform,andthenthroughthesingle-chipmicrocomputercontroldisplaytoLCD1602.ThewaveformisgeneratedthroughMSP430microcontrollerperformsawaveformgenerationprogram,totheD/Aconverterinputdataaccordingtocertainrules,soastoobtainthecorrespondingvoltagewaveformattheoutputendoftheD/Aswitchingcircuit.LearnthekeyboardkeyboardinMSP430,throughsoftwareprogrammingtoselectdifferentwaveform,amplitudeandfrequencyofvoltagesignalwaveform,differentaccordingtodifferentkeys.Thisschemeisakindofcircuitprincipleisrelativelysimple,relativelyeasytoachieve.Keywords:MSP430,Signalgenerator,LCD1602目录1目录摘要....................................................................................................................................................IABSTRACT..............................................................................................................................................II1概述..............................................................................................................................................11.1信号发生器设计背景及意义.................................................................................................11.2信号发生器的发展现状.........................................................................................................21.3本设计采用的研究方法和技术路线.....................................................................................32系统方案论证与选择.................................................................................................................42.1系统方案设计..........................................................................................................................42.2系统方案选择..........................................................................................................................53系统硬件设计..............................................................................................................................63.1MSP430单片机的特点及发展与应用....................................................................................63.1.1MSP430单片机的特点................................................................................................63.1.2单片机的发展及应用.................................................................................................83.1.3MSP430F149单片机的电路图....................................................................................93.2LCD1602液晶显示器简介...................................................................................................103.2.1LCD1602液晶显示器的引脚说明.....................................103.2.2寄存器选择控制表...................................................................................................113.3DAC5571简介.......................................................................................................................113.3.1DAC5571的引脚说明................................................................................................113.3.2DAC5571的原理图及运算方法................................................................................123.4模块电路设计.......................................................................................................................133.4.1基于MSP430F149信号源构成及工作原理..............................................................133.4.2.