实验报告简易波形信号发生器的制作

单 学位号天津滨海职业学院毕业论文 （电气自动化专业） 单片机简易波形发生器的制作 姓 专名业王美月刘晓爽湛洪然指导教师天津滨海职业学院 二〇一二年六月 简易波形发生器制作 一、任务目的 通过制作简易波形发生器，学习D/A转换芯片在单片机应用系统中的硬件接口技术与编程方法。 二、设计 设计并制作出具有以下功能的简易波形发生器： （1）按下相应按键能显示正弦波、锯齿波和三角波；（2）可通过软件调整波形设定参数； （3）可以观察其波形的幅值、周期和频率的变化。三、系统选择 我们采用AT89C51单片机的P0口和P2口来实行与DAC0832芯片间的单缓冲连接方式，采用两级运算放大器，输出电压值Vout为0~+5V。波形发生器电路的元器件清单如下： 五、系统软件设计 采用DAC0832产生锯齿波的编程思路：先输出8位二进制最小值零，然后按加1规律递增，当输出数据达到最大值255时，再回到零重复这一过程，程序流程如下图所示： 开始 初始化 确定输出数字量初值零 输出数字量进行D/A转换 延时 Y 输出 =255？ N 输出数字量加1值 锯齿波发生器程序如下： #include//绝对地址访问头文件 #include #defineucharunsignedchar #defineuintunsignedint #defineDA0832XBYTE[0x7fff]//DAC0832地址 //函数名：delay_1ms //函数功能：延时1ms，T1、工作方式1，定时初值64536 //形式参数：无 //返回值：无 voiddelay_1ms() { TH1=0xfc;//置定时器初值 TL1=0x18; TR1=1;//启动定时器1 while(!TF1);//查询计数是否溢出，即定时1ms时间到，TF1=1 TF1=0;//1ms时间到，将定时器溢出标志位TF1清零 } voidmain()//主函数 { uchari; TMOD=0x10;//置定时器1为方式1 while(1) { for(i=0;i<=255;i++)//形成锯齿波输出值，最大255 { DA0832=i;//D/A转换输出 delay_1ms(); } } } 采用DAC0832产生正弦波的编程思路：把产生正弦波输出的二进制数据以数值的形式预先存放在程序存储器中，再按顺序依次取出送至D/A转换器，程序流程如下图所示： 开始 建立输出正弦波波形码 将波形码进行D/A转换 延时 下一个波形码 N 波形码送 完？ Y 正弦波发生器程序如下： #include #include//绝对地址访问头文件 #defineuintunsignedint #defineucharunsignedchar #defineDA0832XBYTE[0x7fff] voiddelay_1ms();//延时 ucharcodesin[]={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,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF, 0xFF,0xFF,0xFF,0xFF,0xFE,0xFD,0xFD,0xFC,0xFB,0xFA,0xF9, 0xF8,0xF7,0xF6,0xF5,0xF4,0xF2,0xF1,0xEF,0xEE,0xEC,0xEA, 0xE9,0xE7,0xE5,0xE3,0xE1,0xDF,0xDD,0xDA,0xD8,0xD6,0xD4, 0xDl,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}; voidmain()//主函数 { uchari; TMOD=0x10;//置定时器1为方式1 while(1) { for(i=0;i<=255;i++)//形成正弦输出 { DA0832=sin[i];//D/A转换输出 delay_1ms(); } } } //函数名：delay_1ms //函数功能：延时1ms，T1、工作方式1，定时初值64536 //形式参数：无 //返回值：无 voiddelay_1ms() { TH1=0xfc; TL1=0x18; TR1=1; while(!TF1); TF1=0; }//置定时器初值//启动定时器1//查询计数是否溢出，即定时1ms时间到，TF1=1//1ms时间到，将定时器溢出标志位TF1清零 三角波发生器程序如下：#include #include #defineucharunsignedchar#defineuintunsignedint #defineDA0832XBYTE[0x7fff]voiddelay_1ms(); voidmain(void) { uchart; TMOD=0x10; while(1) { for(t=0;t<=255;t++) { DA0832=t; delay_1ms(); } for(t=255;t>=0;t--) { DA0832=t; delay_1ms(); } } } voiddelay_1ms() { TH1=0xfc; TL1=0x18; TR1=1; while(!TF1); TF1=0; } 系统源程序如下： #include #include #defineucharunsignedchar #defineuintunsignedint #defineDA0832XBYTE[0x7fff] voidkey2(); voidkey1(); voidkey3(); voiddelay_1ms() {TH1=0xfc; TL1=0x18; TR1=1; while(!TF1); TF1=0; } ucharcodesin[]= {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,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFE,0xFD,0xFD,0xFC,0xFB,0xFA,0xF9,0xF8,0xF7,0xF6,0xF5,0xF4,0xF2,0xF1,0xEF,0xEE,0xEC,0xEA,0xE9,0xE7,0xE5,0xE3,0xE1,0xDF,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}; voidmain() {unsignedchari; while(1){ i=P1&0x03; switch(i) { case0x01:key1();break; case0x02:key2();break; case0x03:key3();break; } }} voidkey1() { uchari; TMOD=0x10; while(1) { for(i=0;i<=255;i++) { DA0832=sin[i]; delay_1ms(); } } } voidkey2() { uchari; TMOD=0x10; while(1) { for(i=0;i<=255;i++) { DA0832=i; delay_1ms(); } } }