用ds18b20,LCD1602显示，可是什么都显示不了.

只看该作者 · 2017-8-10 09:09

用ds18b20,LCD1602显示，可是什么都显示不了；下面是我的我的程序，帮我看看哪里错了。

#include<at89x52.h>
#define uchar unsigned char
#define uint unsigned int
uchar  diplay[2];
uint temp;
sbit RS=P2^5;
sbit RW=P2^6;
sbit E=P2^7;
sbit DQ=P1^1;

uchar code tab[]="temperature:";
uchar code tab1[]="00oC";
void delay1ms(unsigned int ms)
{
  unsigned int i,j;
  for(i=0;i<ms;i++)
for(j=0;j<100;j++);
}

void delay1us(unsigned int i)
{
      while(i--);
}

void write_com(uchar com)
{
  RS=0;
  RW=0;
  E=0;
  P2=com;
  delay1ms(5);
  E=1;
  delay1ms(5);
  E=0;
}

void write_dat(uchar dat)
{
  RS=1;
  RW=0;
  E=0;
  P2=dat;
  delay1ms(5);
  E=1;
  delay1ms(5);
  E=0;
}

void init()
{

  write_com(0x38);

  write_com(0x0c);

  write_com(0x06);

  write_com(0x01);
}

void ds18b20init()
{
  DQ=0;
  delay1us(480);
  DQ=1;
  delay1us(80);
  DQ=0;
  delay1us(480);
}

void ds18b20write_dat(uchar dat)
{
  unsigned char i;
  for(i=0;i<8;i++)
  {
DQ=0;
delay1us(15);
DQ=dat;
dat<<=1;
delay1us(60);
DQ=1;
  }
}

uchar ds18b20read_dat( )
{
  uchar i,bi,byte;
  uchar dat;
  for(i=8;i>0;i--)
  {
DQ=0;
delay1us(1);
DQ=1;
delay1us(10);
bi=dat;
byte=(byte>>1)|(bi<<7);
delay1us(45);
  }
return dat;
}

void ds18b20Changtemp()
{
ds18b20init();
ds18b20write_dat(0xcc);
ds18b20write_dat(0x44);

}

uint ds18b20readtemp()
{
uchar tmh,tml;
temp=0;
ds18b20init();
ds18b20write_dat(0xcc);
ds18b20write_dat(0xbe);
tml=ds18b20read_dat();
tmh=ds18b20read_dat();
temp=tmh;
temp<<=8;
temp=temp|tml;
return temp;
}

void dispplay()
{
  uchar i,tp;
  tp=temp*0.625;

  diplay[0]=tp/10+0x30;
  diplay[1]=tp/1+0x30;

  write_com(0x80);
for(i=0;i<14;i++)
{
   write_dat(tab[i]);
}

write_com(0x80+0x40);
for(i=0;i<5;i++)
{
   write_dat(tab1[i]);
}
}

void main()
{
  init();
  while(1)
  {
   ds18b20readtemp();
   dispplay();
  }
}