ATMEGA16 and DS18B20 digital tube display

/*This program is an eight-bit common cathode digital tube with two 573 controlled dynamic scans*/
#include
#include
#define uchar unsigned char
#define uint unsigned int
//Note: The function of code is to store the following data in the program memory. If code is not used, it will be placed in the random access memory.
#pragma data:code
const table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d, 0x07,
          0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};//Without decimal point
const table2[]={0xbf,0x86,0xdb,0xcf,0xe6,
                 0xed,0xfd,0x87,0xff,0xdf};//Decimal point encoding     
      
      
/*If uchar table[] is used, it will be placed in the data memory. Never use it this way, it will take up more space. */
/*Two 573, segment code PA3, bit code PA4*/
//Connect 18B20 DQ to PC2 
#define DQ_IN DDRC&=~BIT(2)
//The previous sentence is to set DQ as input
#define DQ_OUT DDRC|=BIT(2)
//The previous sentence is to set DQ as output
#define DQ_SET PORTC|=BIT(2)
//The previous sentence is to set DQ to high level
#define DQ_CLR PORTC&=~BIT(2)
//The previous sentence is to set DQ to low level
#define DQ_RD PINC&BIT(2)
//The previous sentence is to read data from PC2uchar  
disdata[4];
void delay(uint ms)
{
        uint i,j;
 for(i=ms;i>0;i--)
  
    for(j=220;j>0;j--);
     
}
void delayus(uint us)
{
  while(us--);
}
void show(uchar j,uchar k)
{
    DDRA|=BIT(3);
 DDRA|=BIT(4);
 DDRB=0XFF;    
    PORTA|=BIT(3);
 PORTB=table[j];
 PORTA&=~BIT(3); PORTB
 
 =0XFF; PORTB&  =  ~BIT
 (k  );

void show_point(uchar j,uchar k)
{
    DDRA|=BIT(3);
 DDRA|=BIT(4);
 DDRB=0XFF;    
    PORTA|=BIT(3);
 PORTB=table2[j];
 PORTA&=~BIT(3);
 
 PORTB=0XFF;
 PORTB&=~BIT(k);
 PORTA|=BIT(4);
 PORTA&=~BIT(4);
 delay(5);
}
rest_18B20()
{
uchar i ;
DQ_OUT;//Set DQ as output
DQ_SET;//Pull DQ high
delayus(5);
DQ_CLR;//Pull DQ low
delayus(800);
DQ_SET;//Pull DQ high
//delayus(550);
DQ_IN;//Set DQ as input
i=DQ_RD;
delayus(800);
return i;
}
void write_18B20(uchar dat)
{
uchar i;
for(i=0;i<8;i++)
  {
  DQ_OUT;//Set DQ as output
  DQ_CLR;//Pull DQ low
  delayus(30);
   if(dat&0x01)//Judge whether the current bit is high, if it is high, execute the following statement
   {
    DQ_SET;//Pull DQ high, let the bus sample to 1
   }
   else
   {
   DQ_CLR;//Pull DQ low
   }
   delayus(80);            
   DQ_SET;//Release the bus
   dat=dat>>1;
  }
}
uchar read_18B20()
{
uchar i,value;
for(i=0;i<8;i++)
  {
 
  DQ_OUT;//Set DQ as output
  DQ_CLR;//Pull DQ low
   value=value>>1;
  delayus(10);
  DQ_SET;//Release the bus and wait for MCU to sample
  DQ_IN;//Set DQ as input to sample
    if(DQ_RD)
      {
    value|=0x80;
      }
 
   delayus(100);           
 // DQ_SET;//Release the bus
 }
 return value;
}

void display(uint tvalue)
{
   disdata[0]=tvalue/1000;//hundreds
   disdata[1]=tvalue%1000/100;//tens
   disdata[2]=tvalue%100/10;//units
   disdata[3]=tvalue%10;//decimal places   
    show(disdata[0],0);
 delay(2);
    show(disdata[1],1);
 delay(2);
    show_point(disdata[2],2);
 //show(0x80,2);
 show(disdata[3],3);
 //The following display method can also be
used/* uint i,temp[4];
  for(i=0;i<4;i++)
   {
     temp[3-i]=dat%10;
  dat=dat/10;
   }
  
   for(i=0;i<4;i++)
   {
       show(temp[i],i);
    delay(2);*/
  /* // The following three sentences are used to turn off the display and are used for dynamic display
   DDRA|=BIT(3);
      DDRA|=BIT(4);
      DDRB=0XFF;
   }*/
}
void main()
{int L,H;
uint tvalue;
   while(1)
      {
   rest_18B20();
   write_18B20(0xcc);//skip reading the serial number
   write_18B20(0x44);//start temperature conversion
   delayus(50);
   //reset again before reading
   rest_18B20();
   write_18B20(0xcc);//skip reading the serial number
   write_18B20(0xbe);//start sampling, read the register
   delayus(50);
   L=read_18B20();//read the lower eight bits first
   H=read_18B20();//read the higher eight bits later
  tvalue=H;
     tvalue<<=8;
  tvalue=tvalue|L;
    tvalue=tvalue*0.625;//Expand 10 times
   display(tvalue);
   }
}