#define xtal 8000000L
#include <mega8.h>
#asm
    .equ __w1_port=0x12 ;PORTD     :-D
    .equ __w1_bit=0
#endasm
#include <ds18b20.h>
#include <delay.h>
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#define MAX_DEVICES 8
unsigned char pos=0;
unsigned char str[4];
unsigned char st;
unsigned char mesto[4]={
0b11110111,
0b11111011,
0b11111101,
0b11111110
};
unsigned char rom_codes[MAX_DEVICES][9];
unsigned char i,devices; 
int z; 
interrupt [TIM2_OVF] void timer2_ovf_isr(void)
{
TCNT2=0x00;
}
interrupt [TIM0_OVF] void timer0_ovf_isr(void)
{
  TCNT0=0x00;
switch (str[pos]) 
    {
    case '0':
    i=0b00111111;
    break;
    case '1':
    i=0b00000110;
    break;
    case '2':
    i=0b01011011;
    break;
    case '3':
    i=0b01001111;
    break;
    case '4':
    i=0b01100110;
    break;
    case '5':
    i=0b01101101;
    break;
    case '6':
    i=0b01111101;
    break;
    case '7':
    i=0b00000111;
    break;
    case '8':
    i=0b01111111;
    break;
    case '9':
    i=0b01101111;
    break; 
    case '-':
    i=0b01000000;    // Минус
    break;
    case 'B':
    i=0b01100011;    // Градус
    break;
    case 'C':
    i=0b00000000;   //  пусто
    break;         
    };
 PORTC=mesto[pos];
 PORTB=i; 
 pos++;
 if (pos==4) pos=0;  
}
void main(void)
{
#asm("cli");
TIMSK=0b01000001;
TCCR0=0b00000001;
TCCR2=0b00000010;
DDRB=0xFF;
DDRC=0b00001111;
DDRD=0x01;
PORTB=0b01000000;
PORTC=0b00001001;
devices=w1_search(0xf0,rom_codes);
z=ds18b20_temperature(&rom_codes[0][0]);   
itoa(z, str);

if (z>=100) str[3]='B';     //Трехзначное положительное

if (z==0) {str[0]='C';str[1]='C';str[2]='0';str[3]='B';goto ggg;}; //Ноль!      
if ((z>=10) && (z<100)) 
 {
   str[3]='B';
   str[2]=str[1];
   str[1]=str[0];
   str[0]='C'; 
   goto ggg;
 };  
if ((z>0) && (z<10)) 
 {
   st=str[0];
 
   str[0]='C';
   str[1]='C';
   str[2]=st;
   str[3]='B';
   goto ggg;
 };     
if (abs(z)<10)
  {
   str[3]='B';
   str[2]=str[1];
   str[1]=str[0];
   str[0]='C';
   goto ggg;
  };        
  
if (abs(z)>=10)
  {
   str[3]='B';

  }; 
  
    
  ggg: 
#asm("sei");
}