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#include<reg51.h>
#include<intrins.h>
#define uchar unsigned char
#define uint unsigned int
sbit RS = P3^0; //LED1602端口定義
sbit RW = P3^1;
sbit EN = P3^2;
sbit KEY = P3^3; //通道切換按鍵定義
sbit LED = P3^4; //觀察運行狀態(tài)LED
/*ADC0809端口定義*/
sbit ADDA = P2^0; //模擬量輸入控制端口
sbit ADDB = P2^1;
sbit ADDC = P2^2;
sbit ALE = P2^3; //地址鎖存允許信號，輸入，高電平有效。
sbit CLK = P2^4; //時鐘脈沖輸入端。取500khz
sbit ST = P2^5; //脈沖上升沿使0809復位，下降沿啟動A/D轉(zhuǎn)換
sbit EOC = P2^6; // A／D轉(zhuǎn)換結(jié)束信號，輸出，當A／D轉(zhuǎn)換結(jié)束時，此端輸出一個高電平（轉(zhuǎn)換期間一直為低電平）。
sbit OE = P2^7; //數(shù)據(jù)輸出允許信號，輸入，高電平有效。當A／D轉(zhuǎn)換結(jié)束時，此端輸入一個高電平，才能打開輸出三態(tài)門，輸出數(shù)字量。
unsigned char ti[]={'0','1',0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; //lcd數(shù)字數(shù)組。
int t;//時間控制標志位
/*------------------------------------------------
以下是定義LCD函數(shù)
------------------------------------------------*/
void DelayUs2x(unsigned int t)
{
while(--t);
}
void DelayMs(unsigned char t)
{
while(t--)
{
//大致延時1mS
DelayUs2x(2450);
DelayUs2x(2450);
}
}
/*------------------------------------------------
判忙函數(shù)
------------------------------------------------*/
bit LCD_Check_Busy(void)
{
P1= 0xFF;
RS=0;
RW=1;
EN=0;
_nop_();
EN=1;
return (bit)(P1 & 0x80);
}
/*------------------------------------------------
寫入命令函數(shù)
------------------------------------------------*/
void LCD_Write_Com(unsigned char com)
{
while(LCD_Check_Busy()); //忙則等待
RS=0;
RW=0;
EN=1;
P1= com;
_nop_();
EN=0;
}
/*------------------------------------------------
寫入數(shù)據(jù)函數(shù)
------------------------------------------------*/
void LCD_Write_Data(unsigned char Data)
{
while(LCD_Check_Busy()); //忙則等待
RS=1;
RW=0;
EN=1;
P1= Data;
_nop_();
_nop_();
_nop_();
EN=0;
}
/*------------------------------------------------
清屏函數(shù)
------------------------------------------------*/
void LCD_Clear(void)
{
LCD_Write_Com(0x01);
DelayMs(5);
}
/*------------------------------------------------
寫入字符串函數(shù)
------------------------------------------------*/
void LCD_Write_String(unsigned char x,unsigned char y,unsigned char *s)
{
if (y == 0)
{
LCD_Write_Com(0x80 + x); //表示第一行
}
else
{
LCD_Write_Com(0xC0 + x); //表示第二行
}
while (*s)
{
LCD_Write_Data( *s);
s ++;
}
}
/*------------------------------------------------
寫入字符函數(shù)
------------------------------------------------*/
void LCD_Write_Char(unsigned char x,unsigned char y,unsigned char Data)
{
if (y == 0)
{
LCD_Write_Com(0x80 + x);
}
else
{
LCD_Write_Com(0xC0 + x);
}
LCD_Write_Data( Data);
}
/*------------------------------------------------
初始化函數(shù)
------------------------------------------------*/
void LCD_Init(void)
{
LCD_Write_Com(0x38); /*顯示模式設置*/
DelayMs(10);
LCD_Write_Com(0x38);
DelayMs(10);
LCD_Write_Com(0x38);
DelayMs(10);
LCD_Write_Com(0x38);
LCD_Write_Com(0x08); /*顯示關(guān)閉*/
LCD_Write_Com(0x01); /*顯示清屏*/
LCD_Write_Com(0x06); /*顯示光標移動設置*/
DelayMs(10);
LCD_Write_Com(0x0C); /*顯示開及光標設置*/
}
void display(uint temp) //顯示程序
{
int A1,A2,A3;
A1=temp/100; //十位假如是820,821/100=8.21，取整數(shù)部分就為8
A2=temp%100/10;//個位 821除以100的余數(shù)等于21,20除以10的整數(shù)部分為2
A3=temp%100%10; //小數(shù) 821除以100余數(shù)81.除以10余數(shù)。1
LCD_Write_Char(4,0,ti[A1]);
LCD_Write_Char(5,0,ti[A2]);
LCD_Write_Char(6,0,'.');
LCD_Write_Char(7,0,ti[A3]);
LCD_Write_Char(9,0,'V');
}
/*------------------------------------------------
以下是ADC0809函數(shù)
------------------------------------------------*/
void ADbegin()
{
ST=0;
_nop_();
_nop_();
ST=1;
_nop_();
_nop_();
ST=0;
}
void t0init() //T0定時器初始化
{
TMOD=0x02;
TH0=(256-200)/256;
TL0=(256-200)%256;
ET0=1;
TR0=1;
EA=1;
DelayMs(2);
}
float Read_AD() //讀ADC0809數(shù)據(jù)
{
float temp=0; //存放AD采集的數(shù)據(jù)
while(EOC==0); //等待轉(zhuǎn)換完成
OE=1;
temp=P0; //讀取數(shù)據(jù)
DelayMs(1);
return temp;
}
void keyscan()
{
ALE=1; //允許寫入地址
ADDA=0;
ADDB=0;
ADDC=0;
ALE=0;
}
float v;
float q;
void main()
{
t0init() ; //定時器初始化
LCD_Init(); //液晶初始化
LCD_Clear();//清屏
keyscan();//選擇端口
while(1)
{
// if(t>2500) //間隔半秒檢測一次
{
// LED=~LED;
// t=0;
ADbegin();
v=(Read_AD()/256)*50;
q=v+10*v ;
display(q);
}
DelayMs(500);
}
}
void timer0() interrupt 1 //中斷處理函數(shù)，產(chǎn)生約500KHz時鐘供0809工作
{
CLK=~CLK;
t++;
}

復制代碼

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