数码管18B20温度显示程序

ID:313465 · 发表于 2018-4-22 00:40

#include<reg52.h>
#include<intrins.h>
#define  uchar  unsigned  char
#define  uint unsigned  int
#define  duanma  P0
sbit LSA=P2^2;
sbit LSB=P2^3;
sbit LSC=P2^4;
sbit ds=P3^7;
bit flag;
uint temp;
uint shu=0;
    uchar displaydata[4];
   uchar  code table[]={
0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
//
   void digdisplay();
   void digdisplay1();

void delayus(uint t)
{
   while(t--);
}

  void ds_reset() //18b20初始化
  {
ds=1;
delayus(5);
ds=0;
delayus(80);//480-960us
ds=1;
delayus(14);
if(ds==0)
   flag=1;
else
   flag=0;
   delayus(20);

  }
bit ds_read_bit()//读一位
{
  bit dat;
  ds=0;
  _nop_();
  _nop_();
  ds=1;
  _nop_();
  dat=ds;
  delayus(8);
return dat;
}
uchar ds_read_byte() //读一个字节
{
  uchar i,j,k;
  for(i=0;i<8;i++)
{
      j=ds_read_bit();
   k=(j<<7)|(k>>1);

}
return k;
}
void ds_write_byte(uchar dat)//
{
uchar i;
for(i=0;i<8;i++)
{
      ds=0;
   _nop_();
   ds=dat&0x01;//
   delayus(1);
   ds=1;
   dat=dat>>1;
}
//delayus(3);
}
uint read_temperature()//
{
  uchar a,b;
  ds_reset();
  ds_write_byte(0xcc);
  ds_write_byte(0xbe);
a=ds_read_byte();
b=ds_read_byte();
temp=b;
temp=temp<<8;
temp=temp|a;
temp=temp*0.0625*10+0.5;


return temp;
}
void digdisplay1()
{
   displaydata[2]=table[temp/100];

     displaydata[1]=table[temp%100/10]|0x80;

displaydata[0]=table[temp%10];
}

void  main()
{
   while(1)
   {
     ds_reset();
   ds_write_byte(0xcc);
   ds_write_byte(0x44);


   read_temperature();


digdisplay1();
   digdisplay( );

} //while(1);

}

   void digdisplay()
{
/
switch(shu)    //
{
case(0):
LSA=0;LSB=0;LSC=0; break;//
case(1):
LSA=1;LSB=0;LSC=0; break;//
case(2):
LSA=0;LSB=1;LSC=0; break;//
case(3):
LSA=1;LSB=1;LSC=0; break;
case(4):
LSA=0;LSB=0;LSC=1; break;
case(5):
LSA=1;LSB=0;LSC=1; break;
case(6):
LSA=0;LSB=1;LSC=1; break;
case(7):
LSA=1;LSB=1;LSC=1; break;
}
duanma=displaydata[shu];

shu++;
if(shu>3)
   shu=0;



}

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