51单片机超声波测距1602液晶显示程序代码

以下是基于51单片机的超声波测距1602液晶显示程序代码，使用Keil软件编写：

#include <reg52.h>
#include <intrins.h>

#define uchar unsigned char
#define uint unsigned int

sbit RS = P2^6;
sbit RW = P2^5;
sbit EN = P2^7;

sbit Trig = P3^5;
sbit Echo = P3^2;

void delay(uint i)
{
    while(i--);
}

void WriteCommand(uchar com)
{
    RS = 0;
    RW = 0;
    P0 = com;
    EN = 1;
    _nop_();
    _nop_();
    EN = 0;
}

void WriteData(uchar dat)
{
    RS = 1;
    RW = 0;
    P0 = dat;
    EN = 1;
    _nop_();
    _nop_();
    EN = 0;
}

void InitLCD()
{
    WriteCommand(0x38);
    WriteCommand(0x0c);
    WriteCommand(0x06);
    WriteCommand(0x01);
}

void Display(uchar *s)
{
    while(*s)
    {
        WriteData(*s++);
    }
}

void UltrasonicInit()
{
    TMOD = 0x01;
    TH0 = 0;
    TL0 = 0;
    Trig = 0;
    Echo = 0;
}

uint UltrasonicMeasure()
{
    uint distance;
    Trig = 1;
    delay(10);
    Trig = 0;
    while(!Echo);
    TR0 = 1;
    while(Echo);
    TR0 = 0;
    distance = TH0 * 256 + TL0;
    distance = distance / 58;
    return distance;
}

void main()
{
    uchar str[16];
    uint distance;
    InitLCD();
    UltrasonicInit();
    while(1)
    {
        distance = UltrasonicMeasure();
        sprintf(str, "Distance:%dcm", distance);
        WriteCommand(0x80);
        Display(str);
        delay(1000);
    }
}