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谁能给我一段用单片机C语言超声波测距的程序，是让单片机输出一个40KHZ的方波脉冲 AT89S52，接发P1.0(1)

2023-10-09 04:43:00

TAG: 超声

共4条回复

英语范文

我来回答

cloud123

#include <reg51.h>

#include <intrins.h>

#define uchar unsigned char

#define uint unsigned int

#define LCM_Data P0

#define Busy 0x80

sbit RemPin = P3^2;

sbit TxPin = P3^4;

uint length = 0;

uchar flag = 0;

sbit Ceshi1 = P1^2;

sbit Ceshi2 = P1^3;

sbit Ceshi3 = P1^4;

sbit Ceshi4 = P1^5;

sbit P1_0 = P1^0;

sbit P1_1 = P1^1;

sbit P2_0 = P2^0;

sbit P2_1 = P2^1;

sbit P2_2 = P2^2;

sbit P2_3 = P2^3;

sbit P2_4 = P2^4;

sbit P2_5 = P2^5;

void DelayMs(uint Ms)

{

uint i,TempCyc;

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

{

TempCyc = 250;

while(TempCyc--);

}

void delay25us_40KHz(unsigned char us)

{

while(us--)

{

TxPin = 0;

_nop_();_nop_();

_nop_();

TxPin = 1;

_nop_();_nop_();

}

TxPin = 1;

}

void init0int() interrupt 0

{

uint timer_us = 0;

TR0=0;

timer_us = TH0*256+TL0;

if(timer_us>190)timer_us=timer_us-180;

length = ((unsigned long)(340)*timer_us)/2000;

flag = 0;

EA = 0;

}

/*===========================================================================

超出测量时间

=============================================================================*/

void timer0int (void) interrupt 1

{

TR0=0;

length = 0;

flag = 1;

EA = 0;

}

/*===========================================================================

主程序

=============================================================================*/

void main(void)

{

EX0 = 1; //允许总中断中断,使能 INT0 外部中断

ET0 = 1; //接受timer0中断

TMOD=0x11; //设定T0为16位时器，设定T1为16位时器

Ceshi1=0;Ceshi2=0;

P2=0x00;

while(1)

{

if(length>3800) {Ceshi4=0;Ceshi3=0;Ceshi2=0;Ceshi1=0 ;}

if((length<=3800)&&(length>3000)) {Ceshi4=0;Ceshi3=0;Ceshi2=0;Ceshi1=1 ;}

if((length<=3000)&&(length>2000)) {Ceshi4=0;Ceshi3=0;Ceshi2=1;Ceshi1=0 ;}

if((length<=2000)&&(length>1000)) {Ceshi4=0;Ceshi3=0;Ceshi2=1;Ceshi1=1 ;}

if((length<=1000)&&(length>0)) {Ceshi4=0;Ceshi3=1;Ceshi2=0;Ceshi1=0 ;}

if(length==0){Ceshi1=0;Ceshi2=0;Ceshi4=0;Ceshi3=0;}

TH0=0x00;

TL0=0x00;

TR0=1; //启动定时器0

EA = 1; //允许所有中断

delay25us_40KHz(15); //发出脉冲信号

DelayMs(200);

if(P1_0==1) P2_0=1;

if(P1_1==1) P2_1=1;

if(P1_0==0) P2_0=0;

if(P1_1==0) P2_1=0;

if(Ceshi4==0&&Ceshi3==0&&Ceshi2==0&&Ceshi1==0) {P2_5=0;P2_4=0;P2_3=0;P2_2=0;}

if(Ceshi4==0&&Ceshi3==0&&Ceshi2==0&&Ceshi1==1) {P2_5=0;P2_4=0;P2_3=0;P2_2=1;}

if(Ceshi4==0&&Ceshi3==0&&Ceshi2==1&&Ceshi1==0) {P2_5=0;P2_4=0;P2_3=1;P2_2=0;}

if(Ceshi4==0&&Ceshi3==0&&Ceshi2==1&&Ceshi1==1) {P2_5=0;P2_4=0;P2_3=1;P2_2=1;}

if(Ceshi4==0&&Ceshi3==1&&Ceshi2==0&&Ceshi1==0) {P2_5=0;P2_4=1;P2_3=0;P2_2=0;}

}

//length就是测量的长度。。。。之前写的程序，你看一下，有什么问题再问我。

Chen

/********************************************/

//Program Name : 超声波测距仪

//Dedigned by : sc.Dai

//Date : 2007.4.10

/********************************************/

#include <reg52.h>

#include "intrins.h"

#include "12864LCDdriver.h"

#define uchar unsigned char

#define uint unsigned int

#define ulong unsigned long int

#define V=173

sbit CSOut=P1^0;

sbit Start=P1^4;

ulong TIME;

uchar DISTANCE;

uchar code discode[11]={"0","1","2","3","4","5","6","7","8","9"," "};

ulong data disnum[5];

bit data ReceiveOK=0;

bit data TOut;

bit data FLAG;

/*-----------------------------------------------------------*/

//延时函数

/*-----------------------------------------------------------*/

void delay2(uchar x)

{

uchar a,b;

for(a=0;a<x;a++)

for(b=0;b<255;b++);

}

/*-----------------------------------------------------------*/

//初始化

/*-----------------------------------------------------------*/

void init(void)

{

lcd_init();//LCD初始化，开机调用一次

TMOD=0x01;//T0定时器方式1

IT0=0;//INT0负边沿触发

IP=0x01;//INT0高优先级

EA=1;//开总中断

}

/*-----------------------------------------------------------*/

//超声波发射函数

/*-----------------------------------------------------------*/

void CCOut(void)

{

TR0=1;

//40KHz

CSOut=0;//1