#include <avr/io.h>
#include <util/delay.h>
#define SensorIn PINC
#define SensorOut PORTC
#define SensorPin PC0
#define SensorRegister DDRC
#define F_CPU        1000000
char c,f;
int reset(void)
{
    int i;
    SensorRegister |= (1<<SensorPin); //Set sensor pin to output
    SensorOut &= ~(1<<SensorPin); //Set sensor pin low
    _delay_us(500);
    SensorRegister &= ~(1 << SensorPin); //Change sensor pin to input
    _delay_us(70);
    i=SensorIn & (1<<SensorPin); //Store value from sensor into variable i
    _delay_us(410);
    /*Can be used if you want indication that the sensor was "found"
    DDRC |= (1 << PC1); //Set as output
    if(i)
    {
        PORTC &= ~(1<< PC1); //Set low   
    }
    else
    {
        PORTC |= (1 << PC1); //Set high   
    }
    */
    return i; //Return value, if sensor is detected, i = 0, if not, i = 1
}
void writeBit(int bit)
{
    if (bit)
    {
        SensorRegister |= (1<<SensorPin); //set sensor pin to output
        SensorOut &= ~(1<<SensorPin); //Set sensor pin low
        _delay_us(6);
        SensorRegister &= ~(1<<SensorPin);
        _delay_us(64);
    }
    else
    {
        SensorRegister |= (1<<SensorPin); //set sensor pin to output
        SensorOut &= ~(1<<SensorPin); //Set sensor pin low
        _delay_us(60);
        SensorRegister &= ~(1<<SensorPin);
        _delay_us(10);
    }
}
int readBit(void)
{
    int sensor = 0;
    SensorRegister |= (1<<SensorPin); //set sensor pin to output
    SensorOut &= ~(1<<SensorPin); //Set sensor pin low
    _delay_us(6);
    SensorRegister &= ~(1<<SensorPin); //Change sensor pin to input
    _delay_us(9);    
    sensor = SensorIn & (1<<SensorPin); //Read sensor value
    _delay_us(55);    
    return sensor; //Return sensor value
}

void writeByte(int data)
{ 
    int i;
    for(i=0;i<8;i++)
    {
        writeBit(data & 0x01);
        data>>=1;
    }   
}
int readByte(void)
{
   
     int i;
     uint8_t result = 0; //result is an 8 bit variable
     for(i=0;i<8;i++)
     { 
        result >>= 1; //Shift right
        if(readBit()) //If readBit returns 1
        {
            result|= 0x80; //Write a 1 to msb
        } 
     } 
     return result;
    
}
int getTemp(char tempScale)
{
    int type;
    type = 0;
    char get[10];
    char temp_lsb,temp_msb;
    int k;
    char temp_f,temp_c;
    reset();
    writeByte(0xCC);
    writeByte(0x44);
    _delay_us(150);
    reset();
    writeByte(0xCC);
    writeByte(0xBE);
    for(k=0;k<9;k++)
    {
        get[k]=readByte();
    }
    temp_msb = get[1]; 
    temp_lsb = get[0];
    if(temp_msb<=0x80){temp_lsb = (temp_lsb/2);}
    temp_msb = temp_msb & 0x80;
    if(temp_msb>=0x80)
    {
        temp_lsb =(~temp_lsb)+1;
        temp_lsb =(temp_lsb/2);
        temp_lsb =((-1)*temp_lsb);
    }
    temp_c=temp_lsb;
    if (tempScale == 'c')
    {
        /* This can be used to test your temperature sensor if you cannot print to a computer/LCD
        DDRC |= (1 << PC3); //Set as output
        if (temp_c > 20 && temp_c < 27) //if the temperature is greater than 20 and less that 27 degrees celcius
        {
            PORTC |= (1 << PC3); //Set high      
        }
        else
        {
            PORTC &= ~(1<< PC3); //Set low 
        }
        */
        type = temp_c;   
    }
    if (tempScale == 'f')
    {
        temp_f = 1.8*(temp_c) + 32; //convert celcius to fahrenheit
        /* This can be used to test your temperature sensor if you cannot print to a computer/LCD
        DDRC |= (1 << PC3); //Set as output
        if (temp_f > 65 && temp_f < 82) //if the temperature is greater than 65 and less that 82 degrees fahrenheit
        {
            PORTC |= (1 << PC3); //Set high      
        }
        else
        {
            PORTC &= ~(1<< PC3); //Set low
        }
        */
        type = temp_f;    
    }
    return type;
	
}