51单片超声波测距程序

ID:729916 · 发表于 2021-4-4 20:17

超声波测距 + 串口发送距离
#include<reg51.h>
#include<intrins.h>

#define uint unsigned int
#define uchar unsigned char
sbit trig=P1^7;
sbit echo=P3^2;
float tA,dis;

uint distance,timeh,timel;
void delay(uint z)
{
uint x,y;
for(x=z;x>0;x--)
   for(y=1100;y>0;y--);
}
void delay20us()
{
_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();
_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();
}

void initT1_SCI()
{
SM0 = 0; //
SM1 = 1; //10位异步收发，波特率可变

TMOD = 0x21;
TH1 = 0xfd;
TL1 = 0xfd;
TR1 = 1;
}

void Trig()
{
trig = 0;
echo = 0;
TH0 = 0;
TL0 = 0;

trig = 1;
delay20us();
trig = 0;

while(echo == 0);
EX0 = 1;                   //外部中断0允许
ET0 = 1;                   //定时器0中断允许
TR0 = 1;                   //定时器0运行控制位
delay(60);
}

void putChar(uchar c)
{
SBUF = c;
while( !TI ); TI = 0;
}

void putStr(uchar str[], uint n)
{
while( n-- )
{
      putChar( str[n] );
}
}

int main()
{
initT1_SCI();
EA = 1;

while(1)
{
      Trig();
}
return 0;
}

void T0_time() interrupt 1
{
TH0 = 0;
TL0 = 0;
}

void ex0()interrupt 0
{
uchar num[2];
timeh = TH0;
timel = TL0;
tA = (timeh * 256 + timel) * 1.09;
dis = tA * 0.17;
distance = (int)dis;

num[1] = distance / 256;  num[0] = distance % 256;
putStr(num, 2);
TH0 = 0;
TL0 = 0;
TR0 = 0;
EX0 = 0; //关闭外部中断0
ET0 = 0; //关闭定时器1中断
}
Correct
#include<reg51.h>
#include<intrins.h>
#include "6x8.h"
#include "LQ12864.h"
#define uint unsigned int
#define uchar unsigned char
sbit trig=P2^0;
sbit echo=P3^2;
uint succeed;
float tA,dis;
uint distance,timeh,timel;
uint flagCG = 0;
uint flag600 = 0, flag50 = 1;
void delay(uint z)
{
uint x,y;
      for(x=z;x>0;x--)
         for(y=110;y>0;y--);
}
void delay20us()
{
_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();
      _nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();
}
void initT1_SCI()
{
TH0 = 0;
TL0 = 0;
TR0 = 0;
SM0 = 0;       //
SM1 = 1;       //10位异步收发，波特率可变
TMOD = 0x21;
TH1 = 0xfd;
TL1 = 0xfd;
TR1 = 1;
}
void putChar(uchar c)
{
      SBUF = c;
      while( !TI ); TI = 0;
}
void putStr(uchar str[], uint n)
{
      while( n-- )
      {
            putChar( str[n] );
      }
}
void display()
{
unsigned char SPEED[4] = {0,0,0,1};
SPEED[2]=distance/100;                ready(6,0,SPEED[2]);
SPEED[1]=(distance%100)/10;       ready(12,0,SPEED[1]);
SPEED[0]=distance%10;             ready(18,0,SPEED[0]);
putStr(SPEED, 3);
}
void Trig()
{
            trig = 0;
         echo = 0;
            succeed = 0;
            TH0 = 0;
            TL0 = 0;

            trig = 1;
            delay20us();
            trig = 0;

            while(echo == 0);
            EX0 = 1;                                     //外部中断0允许
            ET0 = 1;                                     //定时器0中断允许
            TR0 = 1;                                     //定时器0运行控制位
            delay(60);
}
void main()
{
LCD_Init();
      initT1_SCI();
      EA = 1;


      while(1)
{
            Trig();
            if(succeed)
            {
                     LCD_Cler_6x8(0,0,4);
                     display();
            }
            delay(100);
      }
}
void T0_time() interrupt 1
{
TH0 = 0;
TL0 = 0;
succeed = 0;
}
void ex0()interrupt 0
{
timeh = TH0;
timel = TL0;
tA = (timeh * 256 + timel) * 1.09;
dis = tA * 0.17;
distance = (int)dis;
succeed = 1;
TH0 = 0;
TL0 = 0;
TR0 = 0;
EX0 = 0; //关闭外部中断0
ET0 = 0; //关闭定时器1中断
}

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