根据51单片机的简单函数信号发生器

.实验项目名称_简易函数信号发生器.用用AT89C51单片机采用程序设计方法构成的波形发生器，可产生方波、三角波、正弦波，再通过DA转换器DAC0832将数字信号转换成模拟信号,并通过LM324集成运放把信号放大，通过示波器将波形显示在屏幕上。波形的周期可用程序改变，此设计具有线路简单、结构紧凑、性能优越等特点。通过仿真测试，其性能指标达到了设计要求。并进行实际焊接电路板，进行波形测试，均达到了2、编写程序，并进行程序测试。3、利用单片机采用软件设计方法产生三种波形。4、焊接电路，将程序下载到单片机，并用示波器对输出程序进行测试。验场地及仪器、设备和材料：数字信号可以通过数/模转换器转换成模拟信号，因此可通过产生数字信号再转换成模拟信号的方法来获得所需要的波形。89C51单片机本身就是一个完整的微型计算机，具有组成微型计算机的计数器以及串行通讯接口等，只要将89C51再配置键盘及其接口、显示器及其接口、数模转换及波形输出、指示灯及其接口等四部分，即可构成所需的波形发生器，其信号发生器构成原理框图如下图数模转换电路滤波放大电路机.C51是整个波形发生器的核心部分，通过程序的编写和执行，产生各种各样的信号，当数字信号电路到达转换电路，将其转换成模拟信号也就是所需要的输出波形。并.个中断源。由于本设计功能简单，数据处理容易，数据存储空间也足够，因为我们采用了片选法选择芯片，进行芯片的选择和地址的译码。在单片机最小最小系统中，单片机从P1口接收来自键盘的信号，并通过P0口输出控制信号，通过DA转换芯片最终由示波器显示输出波形。单片机引脚分配如单片机输出的是数字信号，因为要得到模拟信号的波形就必须对其进行数模转换。我们采用了CDA制电路四部分构成。由于其输出为电流输出，因为外加运算放大器LM324使之转换为电压输出。最.后通过示波器显示输出的波形。..整体硬件电路图.析.刚开始在给运放接电源时，接的电源不是稳恒直流电源(用示波器测试了一下电源的输出波形，虽然电源上写的是直流稳恒电源，但是发现他的波形掺杂有杂波)，所以实.验结论基于基于单片机的信号发生器设计，这个信号发生器的设计中涉及到一个典型的控制过LM性地转换成电压输出，再将电压经过运算放大器的放大，可最终做出来的信号发生器满足了题目中的所有要求：当然还是存在不足的地方，比如不能实现频率的按一个小的步进调整。并且当频率太小时矩形波会有些失真。七、指导老师评语及得分：.正弦波程序：#inDlup?>J?6St.V<#p?}in?uin\unsi6n?pin\0x80,0x8c,0x89,0x86,0x8p,0x60,0x6c,0x69,0x66,0x6D,0x6},0xeZ,0x?c,0x?S,0x?L,0x?6,0x?e,0x?D,0x??,0x?},0x}t,0x}Z,0x}V,0x}S,0x}9,0x}L,0x}8,0x}6,0x}e,0x}q,0x}D,0x}p,0x}p,0x}?,0x}},0x}},x},0x}},0x}},0x}},0x}},0x}},0x}},0x}},0x}},0x}},0x}?,0x}p,.0xfd,0xfc,0xfb,0xfa,0xf9,0xf8,0xf7,0xf6,0xf5,0xf4,0xf2,0xf1,0xef,0xee,0xec,0xea,0xe9,0xe7,0xe5,0xe3,0xe1,0xde,0xdd,0xda,0xd8,0xd6,0xd4,0xd1,0xcf,0xcc,0xca,0xc7,0xc5,0xc2,0xbf,0xbc,0xba,0xb7,0xb4,0xb1,0xae,0xab,0xa8,0xa5,0xa2,0x9f,0x9c,0x99,0x96,0x93,0x90,0x8d,0x89,0x86,0x83,0x80,0x80,0x7c,0x79,0x76,0x72,0x6f,0x6c,0x69,0x66,0x63,0x60,0x5d,0x5a,0x57,0x55,0x51,0x4e,0x4c,0x48,0x45,0x43,0x40,0x3d,0x3a,0x38,0x35,0x33,0x30,0x2e,0x2b,0x29,0x27,0x25,0x22,0x20,0x1e,0x1c,0x1a,0x18,0x16,0x15,0x13,0x11,0x10,0x0e,0x0d,0x0b,0x0a,0x09,0x08,0x07,0x06,0x05,0x04,0x03,0x02,0x02,0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x02,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0a,0x0b,0x0d,0x0e,0x10,0x11,0x13,0x15,0x16,0x18,0x1a,0x1c,0x1e,0x20,0x22,0x25,0x27,0x29,0x2b,0x2e,0x30,0x33,0x35,0x38,0x3a,0x3d,0x40,0x43,0x45,0x48,0x4c,0x4e,0x51,0x55,0x57,0x5a,0x5d,0x60,0x63,0x66,0x69,0x6c,0x6f,0x72,0x76,0x79,0x7c,0x80};/*正弦波码*/voiddelay(uintz)//延时子程序{uchari,j;for(i=z;i>0;i--)for(j=110;j>0;j--);}.voiddelay1(uinty){uinti;for(i=y;i>0;i--);}voidmain(){cs;wr=1;cs;wr=0;while(1)//正弦波{P2=tosin[j];j++;delay(1);}wr=1;}.方波程序：#include<reg51.h>#defineucharunsignedchar#defineuintunsignedintsbitcs=P3^7;sbitwr=P3^6;juintys,a=0;ucharcodetosin[256]={0x80,0x83,0x86,0x89,0x8d,0x90,0x93,0x96,0x99,0x9c,0x9f,0xa2,0xa5,0xa8,0xab,0xae,0xb1,0xb4,0xb7,0xba,0xbc,0xbf,0xc2,0xc5,0xc7,0xca,0xcc,0xcf,0xd1,0xd4,0xd6,0xd8,0xda,0xdd,0xdf,0xe1,0xe3,0xe5,0xe7,0xe9,0xea,0xec,0xee,0xef,0xf1,0xf2,0xf4,0xf5,0xf6,0xf7,0xf8,0xf9,0xfa,0xfb,0xfc,0xfd,0xfd,0xfe,0xff,0xff,fd0xfd,0xfc,0xfb,0xfa,0xf9,0xf8,0xf7,0xf6,0xf5,0xf4,0xf2,0xf1,0xef,0xee,0xec,0xea,0xe9,0xe7,0xe5,0xe3,0xe1,0xde,0xdd,0xda,0xd8,0xd6,0xd4,0xd1,0xcf,0xcc,0xca,0xc7,0xc5,0xc2,0xbf,0xbc,0xba,0xb7,0xb4,0xb1,0xae,0xab,0xa8,0xa5,0xa2,0x9f,0x9c,0x99,0x96,0x93,0x90,0x8d,0x89,0x86,0x83,0x80,0x80,0x7c,0x79,0x76,0x72,0x6f,0x6c,0x69,0x66,0x63,0x60,0x5d,0x5a,0x57,0x55,0x51,.0x4e,0x4c,0x48,0x45,0x43,0x40,0x3d,0x3a,0x38,0x35,0x33,0x30,0x2e,0x2b,0x29,0x27,0x25,0x22,0x20,0x1e,0x1c,0x1a,0x18,0x16,0x15,0x13,0x11,0x10,0x0e,0x0d,0x0b,0x0a,0x09,0x08,0x07,0x06,0x05,0x04,0x03,0x02,0x02,0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x02,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0a,0x0b,0x0d,0x0e,0x10,0x11,0x13,0x15,0x16,0x18,0x1a,0x1c,0x1e,0x20,0x22,0x25,0x27,0x29,0x2b,0x2e,0x30,0x33,0x35,0x38,0x3a,0x3d,0x40,0x43,0x45,0x48,0x4c,0x4e,0x51,0x55,0x57,0x5a,0x5d,0x60,0x63,0x66,0x69,0x6c,0x6f,0x72,0x76,0x79,0x7c,0x80};/*正弦波码*/voiddelay(uintz)//延时子程序{uchari,j;for(i=z;i>0;i--)for(j=110;j>0;j--);}voiddelay1(uinty){uinti;for(i=y;i>0;i--);}voidmain().{cs;wr=1;cs;wr=0;while(1){//方波P=0xff;delay(1);delay(1);}wr=1;}三角波程序：#include<reg51.h>#defineucharunsignedchar#defineuintunsignedintsbitcs=P3^7;.sbitwr=P3^6;juintys,a=0;ucharcodetosin[256]={0x80,0x83,0x86,0x89,0x8d,0x90,0x93,0x96,0x99,0x9c,0x9f,0xa2,0xa5,0xa8,0xab,0xae,0xb1,0xb4,0xb7,0xba,0xbc,0xbf,0xc2,0xc5,0xc7,0xca,0xcc,0xcf,0xd1,0xd4,0xd6,0xd8,0xda,0xdd,0xdf,0xe1,0xe3,0xe5,0xe7,0xe9,0xea,0xec,0xee,0xef,0xf1,0xf2,0xf4,0xf5,0xf6,0xf7,0xf8,0xf9,0xfa,0xfb,0xfc,0xfd,0xfd,0xfe,0xff,0xff,fd0xfd,0xfc,0xfb,0xfa,0xf9,0xf8,0xf7,0xf6,0xf5,0xf4,0xf2,0xf1,0xef,0xee,0xec,0xea,0xe9,0xe7,0xe5,0xe3,0xe1,0xde,0xdd,0xda,0xd8,0xd6,0xd4,0xd1,0xcf,0xcc,0xca,0xc7,0xc5,0xc2,0xbf,0xbc,0xba,0xb7,0xb4,0xb1,0xae,0xab,0xa8,0xa5,0xa2,0x9f,0x9c,0x99,0x96,0x93,0x90,0x8d,0x89,0x86,0x83,0x80,0x80,0x7c,0x79,0x76,0x72,0x6f,0x6c,0x69,0x66,0x63,0x60,0x5d,0x5a,0x57,0x55,0x51,0x4e,0x4c,0x48,0x45,0x43,0x40,0x3d,0x3a,0x38,0x35,0x33,0x30,0x2e,0x2b,0x29,0x27,0x25,0x22,0x20,0x1e,0x1c,0x1a,0x18,0x16,0x15,0x13,0x11,0x10,0x0e,0x0d,0x0b,0x0a,0x09,0x08,0x07,0x06,0x05,0x04,0x03,0x02,0x02,0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x0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