#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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