D/A转换实验报告

/**************************************************

实验名称：DA实验一

实验目的：利用单片机控制ADC0832芯片输出电流，让发光

 二极管D12由灭均匀边到最亮，再由最亮变到熄

 灭。在最亮和熄灭的时候用蜂鸣器警报一声。

 如此循环。

实验备注：

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#include<reg52.h>

#define uchar unsigned char

#define uint unsigned int

sbit DUAN = P2^6;

sbit WEI = P2^7;

sbit SPK = P2^3;

sbit DACS = P3^2;

sbit DAWR = P3^6;

void delay1ms(uchar);

void main()

{

uchar flag,var;

flag = 0;

var = 0;

DUAN = 0;

WEI = 0;

DACS = 0;

DAWR = 0;

while(1)

{

if(flag == 0)

{

var = var+5;

P0 = var;

if(var == 255)

{

flag = 1;

SPK = 0;

delay1ms(100);

SPK = 1;

}

delay1ms(50);

}

else

{

var = var - 5;

P0 = var;

if(var == 0)

{

flag = 0;

SPK = 0;

delay1ms(100);

SPK = 1;

}

delay1ms(50);

}

}

}

void delay1ms(uchar x)

{

uchar i, j;

for(i = 0;i < x;i++)

for(j = 0;j < 110;j++);

}