基于单片机智能波形发生器设计

【资源下载】下载地址如下1557：
https://docs.qq.com/doc/DTlRSd01BZXNpRUxl

信号发生器是一种常用的信号源，广泛地应用于电子电路、自动控制系统和教学实验等领域。 本设计采用AT89C51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）、按键和LCD液晶显示电路。电路采用单片机和一片DAC0832数模转换器组成数字式低频信号发生器,可产生正弦波、矩形波、锯齿波和三角波四种波形。系统通过单片机产生数字信号，通过DAC0832转换为模拟信号，再通过放大器LM324就可以得到双极性的各种波形，最终由示波器显示出来。通过键盘来控制四种波形的类型选择、频率变化，并通过液晶1602显示其各自的波形类型以及频率数值。

本设计硬件电路简单，软件功能完善，控制系统可靠，性价比较高，具有一定的实用价值和参考价值。

关键词：AT89C51 单片机； 函数信号发生器；DAC0832；LCD液晶显示

#include <reg51.h>
#include<string.h>
#define uchar unsigned char
#define uint unsigned int

  uchar code tosin[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,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,0xe9,0xe7,0xe5,0xe3,0xe1,0xde,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

//--按键
sbit K1=P2^0;
sbit K2=P2^1; 
sbit K3=P2^2;
sbit K4=P2^3;
sbit K5=P2^4;

uchar WaveChoice=0;
uchar ys=30;
uchar i,a=0;
uchar sqar_num=128;


//--延时MS          输入一个确切的值用于键盘输入时消除按键抖动
void DelayMS(uchar ms)
{
	uchar i;
	while(ms--) for(i=0;i<120;i++);
}
//--延时y*9us    改变ys的值进而利用该函数达到调频率的目的
 void Delay1(uint y)
 {
 	uint i;
	for(i=y;i>0;i--);
 }


//---输出波形
void Out_Wave(uchar i)
{	 uchar j;	
	switch(i)
	{
		case 0:	P0=0x00;break;
		case 1:
				//---正弦波
				for (j=0;j<255;j++)
				{
					P0=tosin[j];
					Delay1(ys);
				} 
				 break;
		case 2:
				//----矩形波
				{
					if(a<sqar_num)
						{
							P0=0xff;
							Delay1(ys);
						}
					else  
						{
							P0=0x00;
							Delay1(ys);
						}
						a++;
				}  break;
		case 3:
				//----三角波
				{
					if(a<128)
						{
							P0=a;
							Delay1(ys);
						}
					else  
						{
							P0=255-a;
							Delay1(ys);
						}
						a++;
				}   break;
		case 4:
			   //----锯齿波
				{
		 			if(a<255)
					{
						P0=a;
						Delay1(ys);
					}