超声波测距_超声波测距_51单片机_

#include "key.h" uchar weixuan[] = {0xfe,0xfd,0xfb,0xf7}; uchar duanxuan[] ={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0xff}; unsigned int flag,outcomeH,outcomeL; float date,x,n; void delay(uint t) { int i; while(t--) for(i=0;i<124;i++); } void display(uint p) //数码管 { uchar ge,shi,bai,qian; qian=p/1000; bai=p/100%10; shi=p%100/10; ge=p%10; if(qian==0) {qian=10;} if(qian==10&&bai==0) {bai=10;} if(bai==10&&shi==0) {shi=10;} P2=weixuan[3]; P0=duanxuan[ge]; delay(1); P0=0xff; P2=weixuan[2]; P0=duanxuan[shi]&~0x80; delay(1); P0=0xff; P2=weixuan[1]; P0=duanxuan[bai]; delay(1); P0=0xff; P2=weixuan[0]; P0=duanxuan[qian]; delay(1); P0=0xff; } void int_1()interrupt 1 //中断函数 { TH0=0; TL0=0; } void timer() //定时器 { TMOD=0X01; TH0=0; TL0=0; ET0=1; EA=1; } void delay_20us() { uchar bt,n=20; while(n--) for(bt=0;bt<25;bt++); n=0; } void test_1() { Trig=1; delay_20us(); Trig=0; TH0=0; TL0=0; while(Echo==0); TR0=1; while(Echo==1); TR0=0; outcomeH =TH0; outcomeL =TL0; flag=outcomeH*256+outcomeL; // flag<<=8; // flag|=outcomeL; date=flag/58.8; x+=date; n++; }