基于51單片機89C51的超聲波LCD1602液晶顯示距離C語言程序

#include

#include

#define uint unsigned int

#define uchar unsigned char

sbit rs=P1^2;

sbit rw=P1^1;

sbit en=P1^0;

char idata disp_buf1[16];//1602顯示緩沖區(qū)1（即上排16個字符）

char idata disp_buf2[16];//1602顯示緩沖區(qū)2（即下排16個字符）

uchar code table[]="celiang ok !";

uchar i;

char idata julidata[3]; //存放距離值變量

unsigned long int JuLi;//距離

unsigned char Gao,Di;//存儲計時器高位，低位

void ChuShiHua();//初始化

void FaShe();//發(fā)射聲波

void Shou();//接收外部中斷程序

void Deng();//空等待

//

void delay(uint n) //延時時間為n*1ms

{ uchar x=0;

for(;n>0;n--)

{

for(;x<250;x++)

{

_nop_();

_nop_();

_nop_();

_nop_();

}

}

}

void check_busy() //LCD忙檢測函數(shù)

{

P0=0xff;

rs=0;

rw=1;

en=1;

while(P0&0x80);

en=0;

}

void lcd_wcom(uchar com) //寫命令

{ check_busy();

rw=0;

rs=0;

P0=com;

en=1;

en=0;

}

void lcd_wdat(uchar dat) //寫數(shù)據(jù)

{ check_busy();

rw=0;

rs=1;

P0=dat;

en=1;

en=0;

}

void lcd_init() //初始化

{

lcd_wcom(0x38); //8位，雙列，5*7

lcd_wcom(0x0c); //開顯示，關(guān)光標(biāo)，光標(biāo)所在字符不閃爍

lcd_wcom(0x06); //顯示地址遞增

lcd_wcom(0x01); //清屏，光標(biāo)移到左上角

}

/

void int_display() //初始顯示

{

uchar m=0;

lcd_init();

lcd_wcom(0x80); //顯示地址

for(m=0;m<16;m++)

{

lcd_wdat(table[m]); //將數(shù)組中字符顯示出來

delay(1000);

}

delay(10);

lcd_wcom(0x01);

}

void updata_disp() //更新緩沖區(qū)數(shù)據(jù)程序

{

disp_buf1[0]=p;

disp_buf1[1]=r;

disp_buf1[2]=s;

disp_buf1[3]=e;

disp_buf1[4]=n;

disp_buf1[5]=t;

disp_buf1[6]=-;

disp_buf1[7]=d;

disp_buf1[8]=i;

disp_buf1[9]=s;

disp_buf1[10]=t;

disp_buf1[11]=a;

disp_buf1[12]=n;

disp_buf1[13]=t;

disp_buf1[14]=:;

disp_buf1[15]=:;

disp_buf2[0]=-;

disp_buf2[1]=-;

disp_buf2[2]=>;

disp_buf2[3]=0;

disp_buf2[4]=0;

disp_buf2[5]=0;

disp_buf2[6]=0;

disp_buf2[7]=julidata[0]+0x30;

disp_buf2[8]=julidata[1]+0x30;

disp_buf2[9]=julidata[2]+0x30;

disp_buf2[10]=c;

disp_buf2[11]=m;

disp_buf2[12]=*;

disp_buf2[13]=*;

disp_buf2[14]=*;

disp_buf2[15]=*;

}

void display() //顯示緩沖區(qū)數(shù)據(jù)函數(shù)

{

uchar i;

lcd_wcom(0x80);

for(i=0;i<16;i++)

lcd_wdat(disp_buf1[i]);

lcd_wcom(0xc0);

for(i=0;i<16;i++)

lcd_wdat(disp_buf2[i]);

}

void int_t0() interrupt 1 using 1 //定時中斷

{

TH0=0x3c;

TL0=0xb0;

i++;

if(i==10)

{

i=0;

display(); //更新顯示數(shù)據(jù)

}

}

//初始化------------------------------------------------------

void ChuShiHua()

{

IE = 0x82; //開T0中斷

TMOD = 0x10; //定時器1模式0，定時器0模式1

PX1 = 1; //INT1高優(yōu)先級

PT0 = 0; //T0 低級中斷

IT1 = 0; //INT1電平觸發(fā)0

TR0 = 1; //啟動定時器0

}

//空等待------------------------------------------------------

void Deng()

{

unsigned int i,j;

for (i = 0; i 100; i++)

for (j = 0; j 100; j++);

}

//發(fā)射方波----------------------------------------------------

void FaShe()

{

unsigned int counter;

IE = 0; //關(guān)中斷

TH1 = 0;

TL1 = 0; //計數(shù)器清零

TR1 = 1; //啟動計算器；

for (counter = 0;counter 16; )

{

P3 = P3 ^ 0x20;

_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();

counter++;

}

P3_5 = 1;

for (counter = 0;counter 300; counter++) _nop_();//2.1315

IE = 0x86; //開中斷

}

//收，外部中斷程序---------------------------------------------

void Shou() interrupt 2 //外部中斷INT1

{

IE = 0x00; //關(guān)中斷

JuLi = 0;

TR1 = 0; //關(guān)定時器1

Gao = TH1;

Di = TL1;

JuLi = JuLi | Gao;

JuLi = JuLi < 8;

JuLi = JuLi | Di;

JuLi = JuLi - 44;

JuLi = JuLi * 85;

JuLi = JuLi/10000;

julidata[0] = JuLi / 100;

julidata[1] = (JuLi - (julidata[0]*100))/10;

julidata[2] = JuLi;

updata_disp();

IE = 0x82; //關(guān)int1中斷，開顯示中斷

}

//主程序------------------------------------------------------

main()

{

display(); //更新顯示數(shù)據(jù)

int_display();

ChuShiHua();

while (1)

{

FaShe();

Deng();

//數(shù)據(jù)送入顯示緩沖區(qū)

}

}