#include<reg52.h>
#include<intrins.h>
#define uint unsigned int
#define uchar unsigned char
sfr P1ASF=0X9D; //P1口模拟功能控制寄存器
sfr ADC_CONTR=0XBC; //ADC控制寄存器
sfr ADC_RES=0XBD; //AD转换结果存放
sfr ADC_RESL=0XBE; //AD转换结果存放
sfr AUXR1=0XA2;
//sfr IE=0XA8;
//sfr IPH=0XB7; //中断优先级控制寄存器高
//sfr IP=0XB8; //中断优先级控制寄存器低
uchar temp;
unsigned int result=0,resulth=0;
void delay1ms(uint z) //误差 0us
{
unsigned char a,b,c;
for(c=z;c>0;c--)
for(b=142;b>0;b--)
for(a=2;a>0;a--);
}
void ADinit()
{
P1ASF=0x01; //P1^0口作为AD输入口
ADC_CONTR=0x20; //P1^0口作为AD输入口,360个时钟周期转换一次
AUXR1=0x00; //高八位存放于ADC_RES,低二位存放于ADC_RESL
IE=0XA0; //开总中断允许AD中断
}
void ADser() interrupt 5
{
P2=0xaa;
_nop_();
_nop_();
_nop_();
_nop_(); //延时4个时钟周期,使其趋于稳定
temp=(ADC_CONTR|0X10)<<4; //此时ADC_FLAG的值被移入CY位;
ADC_CONTR=0xC0; //转换完成,将ADC_FLAG清零
resulth=ADC_RES; //读取高8位值
P2=ADC_RES;
result=(unsigned int)(resulth*5/256);
P2=result; //把ADC_RES的值以点亮小灯的形式显示出来
}
void main()
{
ADinit();
while(1)
{
ADC_CONTR=0XA8;;//开始AD转换
delay1ms(1000); //以下延时非必须,为测试程序而加,
delay1ms(1000);
delay1ms(1000);
delay1ms(1000);
delay1ms(1000);
delay1ms(1000);
delay1ms(1000);
delay1ms(1000);
delay1ms(1000);
delay1ms(1000);
delay1ms(1000);
delay1ms(1000);
delay1ms(1000);
delay1ms(1000);
delay1ms(1000);
delay1ms(1000);
delay1ms(1000);
delay1ms(1000);
delay1ms(1000);
delay1ms(1000);
delay1ms(1000);
delay1ms(1000);
delay1ms(1000);
delay1ms(1000);
ADC_CONTR=0X20;;//关闭AD转
P2=0xff;
delay1ms(1000);
delay1ms(1000);
delay1ms(1000);
delay1ms(1000);
delay1ms(1000);
delay1ms(1000);
delay1ms(1000);
delay1ms(1000);
delay1ms(1000);
delay1ms(1000);
delay1ms(1000);
delay1ms(1000);
delay1ms(1000);
delay1ms(1000);
delay1ms(1000);
delay1ms(1000);
delay1ms(1000);
delay1ms(1000);
delay1ms(1000);
delay1ms(1000);
delay1ms(1000);
delay1ms(1000);
delay1ms(1000);
delay1ms(1000);
}
}
我用的是普中的板子,P2口接有8个共阳极的LED灯,不同的结果会有不同的现象,可以通过小灯的亮灭读取结果
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