AVR Freaks

Hello folks,

I am using DS18B20 with Atmega 32A, I have downloaded a library for atmega 8 @16MHz and modified it for use with atmega 32A @8MHz. The library works fine with atmega 8 but does not work with atmega 32 A. Please help..

This is the code portion where I read and display the temperature on a 16x2 LCD.--

void Measure()
{
    
    while(1)
    {
        if(status_1)// sensor buffer ready
        {
            status_1=0; // clear buffer for new data
            counts = ReadAndAvg();
            rd=(5.0/1024.0)*counts;
            sprintf(lcd_buffer, "Counts: %4d",counts);
            lcd_gotoxy(0,0);
            lcd_puts(lcd_buffer);
        }
            
        if(status_2) // buffer full
        
        {    
            status_2=0; // refresh buffer for new data
            //t = Get_Temp();    
            sprintf(lcd_buffer,"TEMP:");
            lcd_gotoxy(0,1);
            lcd_puts(lcd_buffer);
            //t=(float)(4.8828*read_adc(tmp)/10.0);
            t = ds18b20_gettemp();//read
            //sprintf(lcd_buffer," %04d Deg",t);
            sprintf(lcd_buffer," %03.2f Deg",t);
            lcd_gotoxy(5,1);
            lcd_puts(lcd_buffer);        
                    
        }
        
                
        if(Get_Key_Status(DN))
        {
            //Scroll Key is pressed
            //Check that it was not pressed previously
            if(!Get_PrevKey_Status(DN))
            {
                PREV_KEYS=KEYS;
                lcd_clrscr();
                break;
                
            }
        }
        PREV_KEYS=KEYS;
    }
    
    
}

This is the library :

#include <avr/io.h>
#include <util/delay.h>
#include <avr/interrupt.h>

#include "ds18b20.h"

/*
 * ds18b20 init
 */
uint8_t ds18b20_reset() {
    uint8_t i;

    //low for 480us
    DS18B20_PORT &= ~ (1<<DS18B20_DQ); //low
    DS18B20_DDR |= (1<<DS18B20_DQ); //output
    _delay_us(480);

    //release line and wait for 60uS
    DS18B20_DDR &= ~(1<<DS18B20_DQ); //input
    _delay_us(60);

    //get value and wait 420us
    i = (DS18B20_PIN & (1<<DS18B20_DQ));
    _delay_us(420);

    //return the read value, 0=ok, 1=error
    return i;
}

/*
 * write one bit
 */
void ds18b20_writebit(uint8_t bit){
    //low for 1uS
    DS18B20_PORT &= ~ (1<<DS18B20_DQ); //low
    DS18B20_DDR |= (1<<DS18B20_DQ); //output
    _delay_us(1);

    //if we want to write 1, release the line (if not will keep low)
    if(bit)
        DS18B20_DDR &= ~(1<<DS18B20_DQ); //input

    //wait 60uS and release the line
    _delay_us(60);
    DS18B20_DDR &= ~(1<<DS18B20_DQ); //input
}

/*
 * read one bit
 */
uint8_t ds18b20_readbit(void){
    uint8_t bit=0;

    //low for 1uS
    DS18B20_PORT &= ~ (1<<DS18B20_DQ); //low
    DS18B20_DDR |= (1<<DS18B20_DQ); //output
    _delay_us(1);

    //release line and wait for 14uS
    DS18B20_DDR &= ~(1<<DS18B20_DQ); //input
    _delay_us(14);

    //read the value
    if(DS18B20_PIN & (1<<DS18B20_DQ))
        bit=1;

    //wait 45uS and return read value
    _delay_us(45);
    return bit;
}

/*
 * write one byte
 */
void ds18b20_writebyte(uint8_t byte){
    uint8_t i=8;
    while(i--){
        ds18b20_writebit(byte&1);
        byte >>= 1;
    }
}

/*
 * read one byte
 */
uint8_t ds18b20_readbyte(void){
    uint8_t i=8, n=0;
    while(i--){
        n >>= 1;
        n |= (ds18b20_readbit()<<7);
    }
    return n;
}

/*
 * get temperature
 */
double ds18b20_gettemp() {
    uint8_t temperature_l;
    uint8_t temperature_h;
    double retd = 0;

    #if DS18B20_STOPINTERRUPTONREAD == 1
    cli();
    #endif

    ds18b20_reset(); //reset
    ds18b20_writebyte(DS18B20_CMD_SKIPROM); //skip ROM
    ds18b20_writebyte(DS18B20_CMD_CONVERTTEMP); //start temperature conversion

    while(!ds18b20_readbit()); //wait until conversion is complete

    ds18b20_reset(); //reset
    ds18b20_writebyte(DS18B20_CMD_SKIPROM); //skip ROM
    ds18b20_writebyte(DS18B20_CMD_RSCRATCHPAD); //read scratchpad

    //read 2 byte from scratchpad
    temperature_l = ds18b20_readbyte();
    temperature_h = ds18b20_readbyte();

    #if DS18B20_STOPINTERRUPTONREAD == 1
    sei();
    #endif

    //convert the 12 bit value obtained
    retd = ( ( temperature_h << 8 ) + temperature_l ) * 0.0625;

    return retd;
}

And this is the header file:

#ifndef DS18B20_H_
#define DS18B20_H_

#include <avr/io.h>

//setup connection
#define DS18B20_PORT PORTC
#define DS18B20_DDR DDRC
#define DS18B20_PIN PINC
#define DS18B20_DQ    0

//commands
#define DS18B20_CMD_CONVERTTEMP 0x44
#define DS18B20_CMD_RSCRATCHPAD 0xbe
#define DS18B20_CMD_WSCRATCHPAD 0x4e
#define DS18B20_CMD_CPYSCRATCHPAD 0x48
#define DS18B20_CMD_RECEEPROM 0xb8
#define DS18B20_CMD_RPWRSUPPLY 0xb4
#define DS18B20_CMD_SEARCHROM 0xf0
#define DS18B20_CMD_READROM 0x33
#define DS18B20_CMD_MATCHROM 0x55
#define DS18B20_CMD_SKIPROM 0xcc
#define DS18B20_CMD_ALARMSEARCH 0xec

//stop any interrupt on read
#define DS18B20_STOPINTERRUPTONREAD 1

//functions
extern double ds18b20_gettemp();

#endif