基于51单片机的波形发生器【正弦，方波，锯齿，数码管，振幅频率】（仿真）

基于MCS-51单片机的信号发生器

采用带内部程序存储器的MCS51单片机，采用10位精度D/A（TLC5615），采用运算放大器LM358调节输出信号幅度。使输出最大幅度为0.1V--3V可调。输出的函数信号为正弦波，方波，锯齿波，频率为0.1Hz--100Hz。用数码管显示输出信号类型和频率，扩展按键用于输出功能选择。

说明：频率越高，误差越大，因为51单片机速度太慢了

nclude"TLC5615.h"
#include "74hc595.h"
#define uchar unsigned char
#define uint unsigned int

sbit smg1=P2^0;//数码管引脚
sbit smg2=P2^1;
sbit smg3=P2^2;
sbit smg4=P2^3;
sbit smg5=P2^4;
sbit smg6=P2^5;
sbit smg7=P2^6;
sbit smg8=P2^7;
uchar code smgduan0[10]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};//显示0~9,无小数点
uchar code smgduan1[10]={0xbf,0x86,0xdb,0xcf,0xe6,0xed,0xfd,0x87,0xff,0xef};//显示0~9,有小数点
uchar boxing=0;//波形。正弦、锯齿、方波
uint step=0;//步进数
uchar bu=0;
uchar sec=0,flag=0;//显示计时

uint freq=1000;	//频率/10
uint amp=30;//振幅
uint time=0;//计时
uchar code zhengx[256]={//正弦编码
128,131,134,137,141,144,147,150,153,156,159,162,165,168,171,174,177,180,183,186,188,191,194,
196,199,202,204,207,209,212,214,216,219,221,223,225,227,229,231,233,234,236,238,239,241,242,244,245,246,247,249,
250,250,251,252,253,254,254,255,255,255,255,255,255,255,255,255,255,255,255,254,254,253,252,251,250,250,249,247,
246,245,244,242,241,239,238,236,234,233,231,229,227,225,223,221,219,216,214,212,209,207,204,202,199,196,194,191,
188,186,183,180,177,174,171,168,165,162,159,156,153,150,147,144,141,137,134,131,128,125,122,119,115,112,109,106,
103,100,97,94,91,88,85,82,79,76,73,70,68,65,62,60,57,54,52,49,47,44,42,40,37,35,33,31,29,27,25,23,22,20,18,17,15,
14,12,11,10,9,7,6,6,5,4,3,2,2,1,1,1,0,0,0,0,0,0,0,1,1,1,2,2,3,4,5,6,6,7,9,10,11,12,14,15,17,18,20,22,23,25,27,29,
31,33,35,37,40,42,44,47,49,52,54,57,60,62,65,68,70,73,76,79,82,85,88,91,94,97,100,103,106,109,112,115,119,122,125,128
};

uchar key=0;
uchar key_scan()//按键检测
{
uchar i,j;
i=0;
j=0;
P1=0x0f;
if(P1!=0x0f) //检测有无按下
{
 switch(P1)//检测行
 {
  case 0x0e:i=1;break;
  case 0x0d:i=5;break;
  case 0x0b:i=9;break;
  case 0x07:i=13;
 }
 P1=0xf0;
 switch(P1)//检测列
 {
  case 0xe0:j=0;break;
  case 0xd0:j=1;break;
  case 0xb0:j=2;break;
  case 0x70:j=3;
 }
 }
	if(key!=i+j)
	{
		key=i+j;
		return key;
	}
	else
		return 0;
}
//主函数
void main()
{
	uchar i;
	Hc595SendByte(~amp);
	TMOD=0X02;			//设置计数器工作方式2
//设置定时器
	TH0=217;//给定时器赋初值
	TL0=217;	
	ET0=1;//打开定时器0中断允许
	TR0=1;//打开定时器
	EA=1;//打开总中断

	while(1)
	{
		i=key_scan();
		if(i==1)//正弦波
		{
			boxing=0;
		}
		if(i==2)//方波
		{
			boxing=1;
		}
		if(i==3)//锯齿波
		{
			boxing=2;
		}
		if(i==5)//频率加
		{
			if(freq<1000)
				freq++;
			step=1000/freq-1;//计算步进数
		}
		if(i==6)//频率减
		{
			if(freq>1)
				freq--;
			step=1000/freq-1;//计算步进数
		}
		if(i==9)//频率加10
		{
			if(freq<1000)
				freq+=10;
			step=1000/freq-1;//计算步进数
		}
		if(i==10)//频率减10
		{
			if(freq>10)
				freq-=10;
			step=1000/freq-1;//计算步进数
		}
		if(i==13)//频率加100
		{
			if(freq<1000)
				freq+=100;
			step=1000/freq-1;//计算步进数
		}
		if(i==14)//频率减100
		{
			if(freq>100)

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