51单片机超声波测距（数码管显示）

ID:263971 · 发表于 2017-12-19 21:40

#include <reg52.h>

#include<intrins.h>

#define uchar unsigned char

#define uint unsigned int

sbit fa=P1^0;

sbit shou=P1^1;

sbit dula=P2^6;

sbit wela=P2^7;

unsigned int time;

unsigned long distance;

uchar shi,ge,bai,t;

bit flag;

void display();

unsigned char code dx[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};

void delay1()

{

unsigned int x,y;

for(x=1;x>0;x--)

for(y=110;y>0;y--);

}

//void delay_20us()

// {

// uchar a ;

// for(a=0;a<100;a++);

// }

void delay10(uint us)

{

while(--us)

{

_nop_();

}

}

void main()

{

TMOD=0x11;

TR0=0; //1.085us

TF0=0;

TH0=0;

TL0=0;

shou=0;

TH1=0x3c;

TL1=0xb0; //50ms

EA=1;

ET1=1;

TR1=1;

while(1)

{

display();

if(flag)

{ flag=0;

EA=0;

fa=1;

delay10(10);

fa=0;

while(shou==0);

TR0=1;

TF0=0;

while(shou);

TR0=0;

TF0=0;

time=TH0*256+TL0;

TH0=0;

TL0=0;

distance=time*0.0172;

shi=distance%100/10;

ge=distance%10;

bai=distance/100;

EA=1;

}

}

}

void display()

{

// dula=1;

// P0=dx[n];

// dula=0;

// P0=0xff;

// wela=1;

// P0=0xfe;

// wela=0;

// delay1();

// 第二位

dula=1;

P0=dx[bai];

dula=0;

P0=0xff;

wela=1;

P0=0xfd;

wela=0;

delay1();

////////第三位//////

dula=1;

P0=dx[shi];

dula=0;

P0=0xff;

wela=1;

P0=0xfb;

wela=0;

delay1();

/////第四位/////

dula=1;

P0=dx[ge];

dula=0;

P0=0xff;

wela=1;

P0=0xf7;

wela=0;

delay1();

}

void timer1() interrupt 3

{

TH1=0x3c;

TL1=0xb0; //50ms

t++;

if(t==10)

{

t=0;

flag=1;

}

}

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