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#include <reg52.h>
#define Lcd1602_DB P0
typedef unsigned char uchar;
typedef unsigned int uint;
sbit trig = P1^2;
sbit echo = P1^3;
sbit Lcd1602_RS = P1^0;
sbit Lcd1602_RW = P1^1;
sbit Lcd1602_E = P1^5;
void LcdWaitReady()
{
uchar sta;
Lcd1602_DB = 0xff;
Lcd1602_RS = 0;
Lcd1602_RW = 1;
do{
Lcd1602_E = 1;
sta = Lcd1602_DB;
Lcd1602_E = 0;
}while(sta & 0x80);
}
/*向Lcd602液晶寫入一字節(jié)命令*/
void LcdWriteCmd(uchar cmd)
{
LcdWaitReady();
Lcd1602_RS = 0;
Lcd1602_RW = 0;
Lcd1602_DB = cmd;
Lcd1602_E = 1;
Lcd1602_E = 0;
}
/*向Lcd602液晶寫入一字節(jié)數(shù)據(jù)*/
void LcdWriteDat(uchar dat)
{
LcdWaitReady();
Lcd1602_RS = 1;
Lcd1602_RW = 0;
Lcd1602_DB = dat;
Lcd1602_E = 1;
Lcd1602_E = 0;
}
/*設(shè)置顯示RAM起始地址，亦即光標(biāo)位置*/
void LcdSetCursor(uchar x,uchar y)
{
uchar addr;
if(y == 0)
addr = 0x00 + x;
else
addr = 0x40 + x;
LcdWriteCmd(addr | 0x80);
}
/*在液晶上顯示字符串*/
void LcdShowStr(uchar x,uchar y,uchar *str)
{
LcdSetCursor(x,y);//設(shè)置起始地址
while(*str != '\0')
{
LcdWriteDat(*str++);
}
}
/*液晶輸出數(shù)字*/
void LCDNumPrint(uint num)
{
LcdWriteDat(num/1000 + 0x30);//num的千位//因?yàn)長CD1602顯示的數(shù)字0，是用0x30表示的，也可以把0當(dāng)做字符顯示
LcdWriteDat(num % 1000 / 100 + 0x30);//num的百位
LcdWriteDat(num % 100 /10 + 0x30);//num的十位
LcdWriteDat(num % 10 + 0x30);//num的個(gè)位
}
/*初始化液晶*/
void InitLcd1602()
{
LcdWriteCmd(0x38);
LcdWriteCmd(0x0c);
LcdWriteCmd(0x06);
LcdWriteCmd(0x01);//清屏
}
uint GetDistance(void)
{
uint ss;//用于記錄測得的距離
trig = 1;
delay(2);
trig = 0;
while(!echo);//當(dāng)echo為高電平的時(shí)候，跳出循環(huán)
TH0 = 0；
TL0 = 0;
TF1 = 0;//計(jì)數(shù)溢出標(biāo)志
TR0 = 1；//啟動(dòng)定時(shí)器0，開啟計(jì)時(shí)
while(echo);//echo不為0，即脈沖返回結(jié)束，計(jì)時(shí)結(jié)束
TR0 = 0;//停止計(jì)時(shí)
ss = ((TH0 * 256 + TL0) * 0.34) / 2;//單位是cm
TH0 = 0；
TL0 = 0;
return ss;
}
/*延時(shí)ms的函數(shù)*/
void delay(uchar ms)
{
uchar x;
uchar y;
for(x = ms;x > 0;x--)
for(y = 123;y > 0;y--);
}
void main()
{
uint dist;
InitLcd1602();
TMOD = 0x01;
LcdShowStr(0,0,"The Distance is:")
LcdShowStr(4,1,"cm");
while(1)
{
dist = GetDistance();
LcdSetCursor(0,1);
LCDNumPrint(dist);
}
}

復(fù)制代碼