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#include <AT89X52.H>
#define LEDDATA P0 //LCD連接引腳
#define v20_on {s3=0;s2=0;s1=1;} //宏定義不同量程，不同的開(kāi)關(guān)狀態(tài)
#define v2_on {s3=0;s2=1;s1=0;}
#define v02_on {s3=1;s2=0;s1=0;}
unsigned char code dispcode[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x00};
unsigned char dispbuf[8]={0,0,0,0,0,0,0,0};
unsigned char getdata;
unsigned long temp;
unsigned char i,k,l,m;
unsigned char code mytable0[]=" Welcome to use ";
unsigned char code mytable1[]="Auto Voltmeter!";
unsigned char code line0[]=" Voltmeter "; //初始化顯示
unsigned char code line1[]=" Value: V ";
//引腳定義
sbit lcdrs=P2^0; //RS端
sbit lcden=P2^1; //E使能端
sbit s3=P3^7; //地址輸入引腳，用于選擇輸入通道
sbit s2=P3^6; //通道s1，s2，s3
sbit s1=P3^5;
sbit OE=P3^0; //輸出允許控制端，用于打開(kāi)三態(tài)數(shù)據(jù)輸出鎖存器
sbit EOC=P3^1; //轉(zhuǎn)換結(jié)束信號(hào)輸出引腳，開(kāi)始轉(zhuǎn)換時(shí)為低電平，當(dāng)轉(zhuǎn)換結(jié)束時(shí)為高電平
sbit ST=P3^2; //ADC中start開(kāi)始，時(shí)鐘信號(hào)輸入引腳
void delay(unsigned int z) //延時(shí)子函數(shù) z*1ms
{
unsigned int x,y;
for(x=z;x>0;x--)
for(y=110;y>0;y--);
}
void write_com(unsigned char c) //寫(xiě)命令子函數(shù)
{
lcdrs=0; //低電平選擇為寫(xiě)指令
lcden=0;
LEDDATA=c; //把指令寫(xiě)入P0口
delay(5); //參考時(shí)序圖
lcden=1; //開(kāi)使能
delay(5); //讀取指令
lcden=0; //關(guān)閉使能
}
void write_data(unsigned char d) //寫(xiě)數(shù)據(jù)子函數(shù)
{
lcdrs=1; //高電平選擇為寫(xiě)數(shù)據(jù)
LEDDATA=d; //把數(shù)據(jù)寫(xiě)入P0口
delay(5); //參考時(shí)序圖
lcden=1; //開(kāi)使能
delay(5); //讀取數(shù)據(jù)
lcden=0; //關(guān)閉使能
}
void initialize() //LCD初始化函數(shù)
{
unsigned char num;
lcden=0; //關(guān)閉使能
write_com(0x38); //設(shè)置16x2顯示，5x7點(diǎn)陣顯示，8位數(shù)據(jù)接口
write_com(0x0c); //00001DCB，D(開(kāi)關(guān)顯示)，C(是否顯示光標(biāo))，B(光標(biāo)閃爍，光標(biāo)不顯示)
write_com(0x06); //000001N0，N(地址指針+-1)
write_com(0x01); //清屏指令每次顯示下一屏內(nèi)容時(shí)，必須清屏
write_com(0x80+0x10); //第一行，頂格顯示
for(num=0;num<17;num++)
{
write_data(mytable0[num]);
delay(10);
}
write_com(0x80+0x50); //第二行，從第一格開(kāi)始顯示
for(num=0;num<15;num++)
{
write_data(mytable1[num]);
delay(10);
}
for(num=0;num<16;num++)
{
write_com(0x1c); //0001(S/C)(R/L)**; S/C：高電平移動(dòng)字符，低電平移動(dòng)光標(biāo)； R/L：高電平左移，低電平右移
delay(300);
}
delay(1000);
write_com(0x01); //清屏指令每次顯示下一屏內(nèi)容時(shí)，必須清屏
write_com(0x80);
for(num=0;num<14;num++)
{
write_data(line0[num]);
delay(10);
}
write_com(0x80+0x40);
for(num=0;num<15;num++)
{
write_data(line1[num]);
delay(10);
}
}
void value(unsigned char add,unsigned char dat) //測(cè)試電壓值
{
write_com(0x80+0x47+add);
if(l==3&&add==2||l!=3&&add==1)
{
write_data(0x2e);
}
else
{
write_data(0x30+dat);
}
}
main()
{
initialize(); //LCD顯示屏初始化
while(1)
_20v:
{
v20_on; //選擇通道s1
ST=0;
ST=1;
ST=0;
while(EOC==0); //轉(zhuǎn)換結(jié)束信號(hào)輸出引腳，開(kāi)始轉(zhuǎn)換時(shí)為低電平
OE=1; //輸出允許控制端，用于打開(kāi)三態(tài)數(shù)據(jù)輸出鎖存器
getdata=P1; //將p1口值經(jīng)過(guò)轉(zhuǎn)換賦給getdata
OE=0; //關(guān)閉三態(tài)數(shù)據(jù)輸出鎖存器
if(getdata<21)
{
goto _2v;
}
l=3; //v20_on {s3=0;s2=0;s1=1;}
//l=3表示第3位，s1通道
temp=getdata;
temp=(temp*1000/51)/2;
goto disp;
_2v:
v2_on; //通道s2
ST=0;
ST=1;
ST=0;
while(EOC==0); //開(kāi)始轉(zhuǎn)換
OE=1;
getdata=P1;
OE=0;
if(getdata<21)
{
goto _02v;
}
else if(getdata>200)
{
goto _20v;
}
l=2; //v2_on {s3=0;s2=1;s1=0;}
// l=2表示第2位，s2通道
temp=getdata;
temp=(temp*1000/51)/2;
goto disp;
_02v:
v02_on; //通道s3
ST=0;
ST=1;
ST=0;
while(EOC==0);
OE=1;
getdata=P1;
OE=0;
if(getdata>200)
{
goto _2v;
}
l=1; //v02_on {s3=1;s2=0;s1=0;}
// l=1表示第1位，s3通道
temp=getdata;
temp=(temp*1000/51)/2;
m=temp%10;
if(m>5){temp=temp/10+1;}
else{temp=temp/10;}
goto disp;
disp: for(i=0;i<=3;i++)
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