1路HC-SR04超声波测距4位共阴数码管显示

#include<reg52.h>
#include<intrins.h>
#define uchar unsigned char
#define uint unsigned int

sbit Trig=P3^2;   // 控制端
sbit Echo=P3^3;   //接收端
sbit q=P3^4;
sbit b=P3^5;
sbit s=P3^6;
sbit g=P3^7;
sbit IN1=P0^0;
sbit IN2=P0^1;
sbit ENA=P0^2;
sbit IN3=P0^3;
sbit IN4=P0^4;
sbit ENB=P0^5;

uchar code table[]=   //共阴极数码管    位码
{
0x3f,0x06,0x5b,0x4f,  //0-3
0x66,0x6d,0x7d,0x07,  //4- 7
0x7f,0x6f,0x77,0x7c,  //8-b
0x39,0x5e,0x79,0x71  //c-f
};

void delay(uint a)
{
uint i,j;
for(i=a;i>0;i--)

for(j=110;j>0;j--);
}

uint Dsy[]={0,0,0,0};

void shu(uint b)
{
Dsy[0]=b/1000;
Dsy[1]=b%1000/100;
Dsy[2]=b%1000%100/10;
Dsy[3]=b%10;
}

void delay10us()
{
int i=0;
for(i=0;i<10;i++)
{
_nop_();
}
}

uint GetDistance()
{
    uint i=29412;  //5米来回需要的时间  t=5*2/340*1000000
Echo=0;
TMOD=0x01;
TH0=0;
TL0=0;
EA=1;