51单片机开发 四通道AD转化电压实验与DA转化波形（正弦、三角、矩形）实验及proteus仿真

51单片机开发 四通道AD转化电压实验与DA转化波形（正弦、三角、矩形）实验及proteus仿真

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实验内容

设计一个四通道电压采集系统，所有通道数据通过显示终端显示采集到的模拟数据，同时通过万用表监视被测点电压值，当电压值超过某个值时就用蜂鸣器或扬声器报警。

设计一个电路通过按键或者开关选择相应波形输出，提供三种波形输出：方波、正弦波和三角波，波形频率和幅度可以调整，波形用示波器监视。

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51单片机开发 四通道AD转化电压实验与DA转化波形（正弦、三角、矩形）实验及proteus仿真

1.仿真图

2.代码

#include "reg52.h"
#include "absacc.h"				
#include 				
#include 
#define  PA8255  XBYTE[0xff7c]		//0xff7c为82C55PA端口地址
#define  PB8255  XBYTE[0xff7d]		//0xff7d为82C55PB端口地址
#define  PC8255  XBYTE[0xff7e]		//0xff7e为82C55PC端口地址
#define  COM8255 XBYTE[0xff7f]		//0xff7f为82C55控制寄存器地址
#define DAC_PORT P2 //DAC0832连接端口
#define K_SQU 1	// 方波标志
#define K_TRI 2	//三角波标志
#define K_SAW 3	//正弦波标志
typedef unsigned char u8;
typedef unsigned int u16;
typedef unsigned long u32;

sbit rst_8255=P3^5; 
sbit START	= P1^4;	
sbit OE		= P1^3;
sbit add_a  = P1^2;
sbit add_b	= P1^1;
sbit add_c	= P1^0;

sbit DAC_CS_WR=P3^0;
sbit K1=P3^1;
sbit K2=P3^2;
sbit K3=P3^3;
sbit Func=P3^4;
u8 code Duanma[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};/*0123456789abcdef*/
u8 code Weima[] ={0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f};/*自左向右*/
u8 TempData[8];					
u16 addata=0,addata1=0,addata2=0,addata3=0,addata4=0,i,adcflag=0,dacflag=0;
u8 mode;	//模式：
u16 freq;	//频率
u8 time;	//计次参数
u8 AM;		//调幅
u8 PI=3.141592653589793;
void DAC_Init();
void ADC_Init();
void scanKey(void);
void Display(u8 FirstBit,u8 Num);
void Gain(void);
void squ_wave(u8 location);
void tri_wave(u8 location);
void tra_wave(u8 location);
void saw_wave(u8 location);
void delayms(u16 j);

int main(void)
{
	while(1)
	{
		
		
		while(Func==1)
		{
			if(dacflag==0)
			{
				DAC_Init();
				dacflag=1;
			}
			scanKey();
		}
		while(Func==0)
		{
			if(adcflag==0)
			{
				ADC_Init();
				
				adcflag=1;
			}
			Gain();	 
			Display(0,8);
		}

		
	}
}
void DAC_Init()
{
	time=0;
	DAC_CS_WR=0;
	DAC_PORT=0;
	mode=0;
	freq=100;	
	AM=255;		
	
	TMOD &= 0xF0;	
	TMOD |= 0x02;	
	TL0 = 0x9C;		
	TH0 = 0x9C;		
	TF0 = 0;		
	TR0 = 1;		
	EA = 1;       
	ET0 = 1;      
}
void ADC_Init(void)		
{
	rst_8255=1;			
	delayms(1);
	rst_8255=0;
	COM8255=0x90;    
}
void Display(u8 FirstBit,u8 Num)
{
	static u8 i=0;
	PB8255=0xff;	
	PC8255=0x00;	
	
	PB8255=Weima[i+FirstBit];	
	if(i==1||i==5)
	{
		PC8255=TempData[i]+128;	
	}
	else
		PC8255=TempData[i];
	//delayms(1);
	i++;
	if(i==Num)
		i=0;
}
void Gain(void)
{
	START=0;
	add_a=0; 				//采集第一路信号
	add_b=0;
	add_c=0;
	START=1; 				//根据时序图启动ADC0808的AD程序
	START=0;
	OE=1;					//转换结果允许输出
 	addata1=PA8255;
	OE=0;	
	
	START=0;
	add_a=1; 		
	add_b=0;
	add_c=0;
	START=1; 	
	START=0;
	OE=1;				
 	addata2=PA8255;
	OE=0;
	
	START=0;
	add_a=0; 			
	add_b=1;
	add_c=0;
	START=1; 		
	START=0;
	OE=1;			
 	addata3=PA8255;
	OE=0;
	
	START=0;
	add_a=1; 		
	add_b=1;
	add_c=0;
	START=1; 			
	START=0;
	OE=1;				
 	addata4=PA8255;
	OE=0;
	
	addata=(addata1+addata2+addata3+addata4)*1.96/4;
	
	Display(0,8);	
  TempData[3]=Duanma[addata%10];	 
	TempData[2]=Duanma[addata/10%10];
  TempData[1]=Duanma[addata/100%10];
	TempData[0]=Duanma[addata/1000];

}
void scanKey(void)
{
	if(K1==0)
	{
		mode=1;
	}
	if(K2==0)
	{
		mode=2;
	}
	if(K3==0)
	{
		mode=3;
	}
}

void squ_wave(u8 location)
{
	
	if(location<50){
		DAC_PORT=AM;
	}
	else{
		DAC_PORT=0x00;
	}
}

void tri_wave(u8 location)
{
	u8 y;
	if(location<50)
		y=(50-location)*AM/50;
	else
		y=(location-50)*AM/50;
	DAC_PORT=y;
}

void saw_wave(u8 location)
{
	DAC_PORT=location*AM/100;
}

void sine_wave(u8 location)

{
  double x=(double)location/50*PI;//
	u8 y=(sin(x)*(AM/2)+(AM/2));//
	DAC_PORT=y;

}

void Timer0Work() interrupt 1 //中断服务函数
{

	switch(mode)
	{
	    case K_SQU:squ_wave((u8)(time*freq/100));break;
			case K_TRI:tri_wave((u8)(time*freq/100));break;
			case K_SAW:sine_wave((u8)(time*freq/100));break;
	}
	time++;
	if(time>=100)//计数100次
		time=0;
}
void delayms(u16 j)
{
	u8 i;
	for(;j>0;j--)
	{
		i=250;
		while(--i);
		i=249;
		while(--i);
	}
}

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总结

大佬们，可以支持一下。谢谢！！！
四通道AD转化电压实验与DA转化波形（正弦、三角、矩形）实验及proteus仿真