深入学习STC12单片机AD多通道转 -

#include "reg51.h"
#include "intrins.h"
#define uchar unsigned char//只有256
#define uint unsigned int//有16位但占内存。
sbit rs=P2^6;//
sbit rw=P2^5;//
sbit en=P2^7;//
sbit k1=P1^4;//按键
sbit k2=P1^5;//按键
sbit k3=P1^6;//按键
sbit k4=P1^7;//按键
sbit k5=P3^5;//按键
uchar th=50;//放大10 倍
uchar tl=37;//放大10 倍
uint tmp;//tmp电压值
sbit led=P2^0;
//STC12C5A60S2 特殊功能寄存器关于AD部分的寄存器定义
sfr ADC_CONTR = 0xBC; //ADC控制寄存器通道配置
sfr ADC_RES = 0xBD; //ADC高8位数据寄存器(存AD转换的结果，共10位)
sfr ADC_LOW2 = 0xBE; //ADC低2位数据寄存器(存AD转换的结果，共10位)
sfr P1ASF = 0x9D; //P1第二功能选择寄存器
unsigned char ch ; //ADC通道选择,本例程选择P1.0为AD转换,其他P1口做普通IO用 01234567
unsigned int ad_out;//ADC_CONTR寄存器的位变量定义
#define ADC_POWER 0x80 //ADC power control bit
#define ADC_FLAG 0x10 //ADC complete flag
#define ADC_START 0x08 //ADC start control bit
#define ADC_SPEEDLL 0x00 //420 clocks
#define ADC_SPEEDL 0x20 //280 clocks
#define ADC_SPEEDH 0x40 //140 clocks
#define ADC_SPEEDHH 0x60 //70 clocks
void delay(unsigned int n)
{
unsigned int x;
while (n--)
{
x = 5000;
while (x--);
}
}
void InitADC() //10位AD数据缓存
{
P1ASF = 0xff;//设置P1.0为AD脚，P1ASF = 0x01 其他P1口为普通IO功能
ADC_RES = 0; //清空AD输出高8位
// if(++ch>7)ch=0; //循环显示8个通道AD采样
ADC_CONTR = ADC_POWER | ADC_SPEEDLL | ADC_START | ch;
delay(2); //ADC power-on delay and Start A/D conversion
}
void write_com(uchar com)//写命令
{
rs=0;//
rw=0;
en=0;
P0=com;
delay(2);
en=1;
delay(5);
en=0;
delay(2);
}
void write_dat(uchar dat)//写数据
{
rs=1;//
rw=0;
en=0;
P0=dat;
delay(2);
en=1;
delay(5);
en=0;
delay(2);
}
void write_zfc(uchar *p)//定义一个带指针的函数?（字符串）
{
while(*p!=0)//不能用";"
write_dat(*p++);
}
void init_1602()//1602初始化
{
write_com(0x38);//设置16X2显示
delay(1);
write_com(0x0C);//0e光标不闪//0c不显//0f闪烁显示
delay(1);
write_com(0x06);//光标移位加1
delay(1);
write_com(0x01);//清屏
delay(1);
write_com(0x80);
write_zfc("TH:");
write_com(0x80+8);
write_zfc("TL:");
}
void write_TH(uchar th)//高温显示
{
uchar a,b;
a=th/10;
b=th%10;
write_com(0x80+3);
write_dat(0x30+a);
write_dat('.');
write_dat(0x30+b);
write_dat('V');
}
void write_TL(uchar tl)//低温显示
{
uchar a,b;
a=tl/10;
b=tl%10;
write_com(0x80+11);
write_dat(0x30+a);
write_dat('.');
write_dat(0x30+b);
write_dat('V');
}
void display()//4位显示子函数
{
uchar qian,bai,shi,ge;
tmp = (ad_out * 50) / 1024; //10位AD读取的数值是0-1024，将这个值转换成对应的0-5V电压
qian=tmp/1000;
bai=tmp%1000/100;
shi=tmp%100/10;
ge=tmp%10;
write_com(0x80+0x40);
write_zfc("ch");
write_dat(0x30+ch);
write_com(0x80+0x40+5);
write_zfc("out:");
//write_dat(0x30+qian);
// write_dat(0x30+bai);
write_dat(0x30+shi);
write_dat('.');
write_dat(0x30+ge);
//write_dat(0xdf);//显上0标志
write_dat('V');
}
void keyscan()
{
if(k1==0)
{
delay(5);
while(!k1);
th++;
if(th>50)
th=0;
write_TH(th);
}
if(k3==0)
{
delay(5);
while(!k3);
th--;
if(th<1)
th=50;
write_TH(th);
}
if(k2==0)
{
delay(5);
while(!k2);
tl++;
if(tl>50)
tl=0;
write_TL(tl);
}
if(k4==0)
{
delay(5);
while(!k4);
tl--;
if(tl<1)
tl=50;
write_TL(tl);
}
if(k5==0)//选择AD通道0——7
{
delay(5);
while(!k5);
ch++;
if(ch>7)
ch=0;
}
}
void main()
{
InitADC(); //AD初始化
IE = 0xa0; //允许AD中断
init_1602();
write_TH(th);
write_TL(tl);
led=1;
while (1)
{
display();
keyscan();
EA = 1;// 打开AD中断
if(tmp>tl)//tmp电压值放大10倍进行比较显示
{led=0;}
else led=1;
}
}
void adc_isr() interrupt 5 using 1 //通道电压整合
{
ADC_CONTR &= !ADC_FLAG; //Clear ADC interrupt flag
ad_out = (ADC_RES << 2) + ADC_LOW2; //高8位+低两位
//if(++ch>7)ch=0;//循环显示8个通道AD采样
ADC_CONTR = ADC_POWER | ADC_SPEEDLL | ADC_START | ch;
}

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