ds18b20数码管显示

ID:900977 · 发表于 2021-4-16 11:05

#include "reg52.h"

#define uchar unsigned char
#define uint unsigned int

uchar temp1,temp2,temp,A;
uchar sb[]={0xfc,0x60,0xda,0xf2,0x66,0xb6,0xbe,0xe0,0xfe,0xf6,0xee,0x3e,0x9c,0x7a,0x9e,0x8e,0x00};
sbit DQ=P1^0;

void delay(uint t)
{
  uint j,k;
  for(j=t;j>0;j--)
for(k=115;k>0;k--);
}

void display_1820(uchar x)
{
  uint i,ge,shi,bai;
  bai=x/100;
  shi=x%100/10;
  ge=x%10;
  P0=sb[ge];
  for(i=0;i<4;i++)
  {
if(i==0){P0=0x00;P0=sb[0];P2=0xfe;delay(10);}
if(i==0){P0=0x00;P0=sb[bai];P2=0xfd;delay(10);}
if(i==0){P0=0x00;P0=sb[shi];P2=0xfb;delay(10);}
if(i==0){P0=0x00;P0=sb[ge];P2=0xf7;delay(10);}
  }
}

void delay_18b20(uint i)
{
  for(;i>0;i--);
}

void init()
{
  uchar x=0;
  DQ=1;
  delay_18b20(8);
  DQ=0;
  delay_18b20(80);
  DQ=1;
  delay_18b20(14);
  x=DQ;
  delay_18b20(20);
}

uchar read()
{
  uchar i=0;
  uchar dat=0;
  for(i=8;i>0;i--)
  {
DQ=0;
dat>>=1;
DQ=1;
if(DQ)dat|=0x80;
delay_18b20(4);
  }
  return dat;
}

void write(uchar dat)
{
  uchar i=0;
  for(i=8;i>0;i--)
  {
DQ=0;
DQ=dat&0x01;
delay_18b20(5);
DQ=1;
dat>>=1;
  }
}

uchar read1()
{
  uchar a=0,b=0,t=0;
  init();
  write(0xcc);
  write(0x44);
  delay_18b20(100);
  init();
  write(0xcc);
  write(0xbe);
  delay_18b20(100);
  a=read();
  b=read();
  temp1=b<<4;
  temp1+=(a&0xf0)>>4;
  temp2=a&0x0f;
  temp=((b*256+a)>>4);
  return temp;

}

void main()
{
  while(1)
  {
A=read1();
display_1820(A);
  }
}

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