超声波测距代码

ID:955647 · 发表于 2021-7-27 21:19

#include<reg51.h>
#include<intrins.h>
#define uchar unsigned char
#define uint unsigned int
#define LCD1602_DB  P0
sbit LCD1602_RS = P2^6;
sbit LCD1602_RW = P2^5;
sbit LCD1602_EN = P2^7;
sbit Trig = P2^1;
sbit Echo = P2^0;
uchar PuZh[]="The Distance: ";
uchar code ASCII[15] = {'0','1','2','3','4','5','6','7','8','9','.','-','C','M'};
void Read_Busy()
{
      uchar sta;
LCD1602_DB = 0xff;
LCD1602_RS = 0;
LCD1602_RW = 1;
do
{
      LCD1602_EN = 1;
      sta = LCD1602_DB;
      LCD1602_EN = 0;
}while(sta & 0x80);
}
void delayms(uint ms)
{
      uchar i=100,j;
      for(;ms;ms--)
      {
            while(--i)
            {
                     j=10;
                     while(--j);
            }
      }
}
void Lcd1602_Write_Cmd(uchar cmd)
{
Read_Busy();
LCD1602_RS = 0;
LCD1602_RW = 0;
LCD1602_DB = cmd;
LCD1602_EN = 1;
LCD1602_EN = 0;
}
void Lcd1602_Write_Data(uchar dat)
      {
   Read_Busy();
   LCD1602_RS = 1;
   LCD1602_RW = 0;
   LCD1602_DB = dat;
   LCD1602_EN = 1;
   LCD1602_EN = 0;
}
      void LcdSetCursor(uchar x,uchar y)
            {
uchar addr;
if(y == 0)
      addr = 0x80 + x;
else
      addr = 0x40 + x;

Lcd1602_Write_Cmd(addr|0x80);
}
      void DisplayOneChar(uchar X, unsigned char Y, uchar DData)
{
      Y &= 0x1;
      X &= 0xF;
      if (Y) X |= 0x40;
      X |= 0x80;
      Lcd1602_Write_Cmd(X);
      Lcd1602_Write_Data(DData);
}
void LcdShowStr(uchar x,uchar y,uchar *str)
{
LcdSetCursor(x,y);
while(*str != '\0')
{
      Lcd1602_Write_Data(*str++);
}
}
void InitLcd1602()
{
Lcd1602_Write_Cmd(0x38);
Lcd1602_Write_Cmd(0x0c);
Lcd1602_Write_Cmd(0x06);
Lcd1602_Write_Cmd(0x01);
}
static uchar DisNum = 0;
   uint  time=0;
         unsigned long S=0;
         bit    flag =0;
         uchar disbuff[4]          ={ 0,0,0,0,};
void Conut(void)
      {
      time=TH0*256+TL0;
      TH0=0;
      TL0=0;

      S=(time*1.7)/100;
      if((S>=700)||flag==1)
      {
      flag=0;

      DisplayOneChar(0, 1, ASCII[11]);
      DisplayOneChar(1, 1, ASCII[10]);
      DisplayOneChar(2, 1, ASCII[11]);
      DisplayOneChar(3, 1, ASCII[11]);
      DisplayOneChar(4, 1, ASCII[12]);
      }
      else
      {
      disbuff[0]=S/100;
      disbuff[1]=S%100/10;
      disbuff[2]=S%100%10;
      DisplayOneChar(0, 1, ASCII[disbuff[0]]);
      DisplayOneChar(1, 1, ASCII[10]);
      DisplayOneChar(2, 1, ASCII[disbuff[1]]);
      DisplayOneChar(3, 1, ASCII[disbuff[2]]);
      DisplayOneChar(4, 1, ASCII[12]);
            DisplayOneChar(5, 1, ASCII[13]);
      }
      }
void zd0() interrupt 1
{
flag=1;
}
void  StartModule()
  {
      Trig=1;
      _nop_();  _nop_(); _nop_(); _nop_();
      _nop_();  _nop_(); _nop_(); _nop_();
      _nop_();  _nop_(); _nop_(); _nop_();
      _nop_();  _nop_(); _nop_(); _nop_();
            _nop_();  _nop_(); _nop_(); _nop_();
      Trig=0;
  }
      void main(void)
{

      TMOD=0x01;
      TH0=0;
      TL0=0;
      ET0=1;
      EA=1;
  InitLcd1602();
      LcdShowStr(0,0,PuZh);
      while(1)
      {
               StartModule();
         while(!Echo);
         TR0=1;
         while(Echo);
         TR0=0;
      Conut();
               delayms(80);
      }

}

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