dis18b20的时序哪里写发错了？

只看该作者 · 2016-3-12 10:59

请大家帮我看一下dis18b20的时序哪里写发错了？在数码管上只显示两位0，下面是程序：
#include<stc15f2k60s2.h>
#include<intrins.h>
#define uint unsigned int
#define uchar unsigned char
#define rst573 P2&=0x1f //¹Ø±ÕÑ¡ÖÐ
#define smgY6C P2|=0xC0;//Î»Ñ¡Í¨
#define smgY7C P2|=0xe0;//¶ÎÑ¡Í¨
#define fengming P2|=0xa0;//Ñ¡ÖÐ·äÃùÆ÷+¼ÌµçÆ÷

sbit dq=P1^4;
sbit Wr=P4^2;

code uchar  duan[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0x88,0x83,0xc6,0xa1,0x86,0x8e,0xbf};
   // È«Ãð+ 1~8wei/*1011111
code uchar  wei[]={0x00,0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80};    //Î»Âë
uchar dspcom=6;
uchar k=0;
uint real_temp;
uchar flag;

void Delay60us(uint i) //@11.0592MHz
{
unsigned char j;
j = 162;
do
{
while (--j);
} while (--i);
}

void Delay30us() //@11.0592MHz
{
unsigned char i;

_nop_();
_nop_();
i = 80;
while (--i);
}
void delay(uint z)//msÑÓÊ±º¯Êý
{
uint x,y;
for(x=z;x>0;x--)
for(y=1100;y>0;y--);
}

void CHS_BEEP_close()
{    Wr=0;
   fengming;//
   P0=0x0f;
   Wr=1;
}

void ds18b20_init()
{
dq=1;
   _nop_();
   dq=0;
   Delay60us(10);
   dq=1;
   Delay60us(1);

}

void temperaturewrite_Byte(uchar dat)//Ð´×Ö½Úº¯Êý
{
  uchar i,j;
dq=1;
for(i=1;i<=8;i++)
{
j=dat&0x01;
dat>>=1;
  if(j)
   {
dq=0;
i++;i++;
dq=1;
Delay30us();
}
    else
   {
   dq=0;
   Delay30us();
   dq=1;
   _nop_();
   }
}
}
bit temperatureread_bit()//¶ÁÒ»Î»
{
   uint i;
bit dat;
dq=0;i++;i++;       //i++ ÆðÑÓÊ±×÷ÓÃ
   Delay30us();
dq=1;i++;i++;
dat=dq;
i=80;while(i>0)i--;
return (dat);
}
uchar temperatureread_Byte()//¶Á×Ö½Úº¯Êý
  {
uchar dat,i,j;
dat=0;
dq=0;
i++;i++;
for(i=1;i<=8;i++)
{
   j=temperatureread_bit();
dat=(j<<7)|(dat>>1);

}
return(dat);
  }

void display(uint x)
{
uchar a,b;
a=x/10;
b=x%10;
smgY7C;//¶ÎÑ¡Í¨
P0=0xff;//ÏûÒþ
rst573;

  smgY6C;//Î»Ñ¡Í¨
P0=wei[7];
rst573;

smgY7C;
P0=duan[a];
  rst573;
delay(1);

smgY6C;//Î»Ñ¡Í¨
P0=wei[8];
rst573;

smgY7C;
P0=duan[b];
  rst573;
delay(1);

}

uint get_temperature()//»ñÈ¡ÎÂ¶ÈÖµ
{
uchar h,l;
uint temp;

ds18b20_init();//Æô¶¯ÎÂ¶È×ª»»
temperaturewrite_Byte(0xcc);
temperaturewrite_Byte(0x44);

ds18b20_init();
temperaturewrite_Byte(0xcc);
temperaturewrite_Byte(0xbe);
l=temperatureread_Byte();//¶ÁÈ¡ÎÂ¶ÈµÍ×Ö½Ú
h=temperatureread_Byte();//¶ÁÈ¡ÎÂ¶È¸ß×Ö½Ú
temp=h;
temp<<=8;
temp=temp|l;
real_temp=temp*0.0625;
return(real_temp);

  }
void timer_init()
{
TMOD=0x01;
TH0=(65536-2000)/256;
TL0=(65536-2000)/256;
EA=1;//´ò¿ª×ÜÖÐ¶Ï
ET0=1;

  }

int main(void)
{

timer_init();

while(1)
{ CHS_BEEP_close();    //¹Ø±Õ·äÃùÆ÷¼ÌµçÆ÷

   display(real_temp);
   if(flag)
   {
   flag=0;
   real_temp=get_temperature();//¶ÁÈ¡ÎÂ¶È
   }
}
  }
void timer_0(void) interrupt 1 using 0
{
TH0=(65536-2000)/256;//ÒÑ¾×Ô¶¯ÖØ×°³õÖµ
TL0=(65536-2000)/256;
if(++k==150)
{ k=0;//300msÖØÐÂ»ñÈ¡ÎÂ¶È
flag=1;

}
  }