Взял пример из CVAVR DS1820 а он в протеусе не работает подскажите пож-та кто знает чо не так:

/* Multipoint thermometer with LCD display
using the Dallas Semiconductor DS1820/18S20
1 Wire bus temperature sensors

CodeVisionAVR C Compiler
(C) 2000-2007 HP InfoTech S.R.L.
http://www.hpinfotech.ro

Chip: ATmega8515
Memory Model: SMALL
Data Stack Size: 128 bytes

PLEASE MAKE SURE THAT THE CKSEL0..3 FUSE
BITS ARE PROGRAMMED TO USE THE EXTERNAL
3.6864MHz CLOCK SOURCE OF THE STK500 AND NOT
THE INTERNAL 1MHz OSCILLATOR.
The ATmega8515 chip comes from the factory
with CKSEL0..3 fuse bits set to use the
internal 1 MHz oscillator.

The DS1820/18S20 sensors are connected to
bit 6 of PORTA of the ATmega8515 as follows:

[DS1820/18S20] [STK500 PORTA HEADER]
1 GND - 9 GND
2 DQ - 7 PA6
3 VDD - 10 +5V

All the temperature sensors must be connected
in parallel

AN 4.7k PULLUP RESISTOR MUST BE CONNECTED
BETWEEN DQ (PA6) AND +5V !
*/
#asm
.equ __w1_port=0x1b
.equ __w1_bit=6
#endasm

/* Use an 2x16 alphanumeric LCD connected
to PORTC as follows:

[LCD] [STK500 PORTC HEADER]
1 GND- 9 GND
2 +5V- 10 VCC
3 VLC- LCD contrast control voltage 0..1V
4 RS - 1 PC0
5 RD - 2 PC1
6 EN - 3 PC2
11 D4 - 5 PC4
12 D5 - 6 PC5
13 D6 - 7 PC6
14 D7 - 8 PC7
*/

#asm
.equ __lcd_port=0x15
#endasm

#include <lcd.h> // LCD driver routines
#include <ds1820.h>
#include <delay.h>
#include <stdio.h>

char lcd_buffer[33];

/* maximum number of DS1820/DS18S20 connected to the 1 Wire bus */
#define MAX_DEVICES 8

/* DS1820/DS18S20 devices ROM code storage area */
unsigned char rom_code[MAX_DEVICES][9];

main()
{
unsigned char i,j,devices;
int temp;

lcd_init(16);
lcd_putsf("CodeVisionAVRn1 Wire Bus Demo");
delay_ms(2000);
lcd_clear();

/* detect how many DS1820/DS18S20 devices
are connected to the 1 Wire bus */
devices=w1_search(0xf0,rom_code);
sprintf(lcd_buffer,"%u DS1820nDevice detected",devices);
lcd_puts(lcd_buffer);
delay_ms(2000);

/* display the ROM codes for each device */
if (devices)
{
for (i=0;i<devices;i++)
{
sprintf(lcd_buffer,"Device #%u ROMnCode is:",i+1);
lcd_clear();
lcd_puts(lcd_buffer);
delay_ms(2000);
lcd_clear();
for (j=0;j<8;j++)
{
sprintf(lcd_buffer,"%02X ",rom_code[j]);
lcd_puts(lcd_buffer);
if (j==3) lcd_gotoxy(0,1);
};
delay_ms(5000);
};
}
else
while (1); /* stop here if no devices were found */

/* measure and display the temperature(s) */
while (1)
{
for (i=0;i<devices;)
{
temp=ds1820_temperature_10(&rom_code[0]);
j='+';
if (temp<0)
{
j='-';
temp=-temp;
};
sprintf(lcd_buffer,"t%u=%c%i.%uxdfC",++i,j,temp/10,temp%10);
lcd_clear();
lcd_puts(lcd_buffer);
delay_ms(800);
};
};
}