/* DALLAS */
#ifndef _OneWire_H_
#define _OneWire_H_

volatile unsigned char PRESEN;

//Komunikace s obvody DALLAS

//Příkaz reset
void RESET(volatile unsigned char *PORT,unsigned char DQ)
{

#define DS_PORT *PORT
PORT--;
#define DS_DDR *PORT

	DS_PORT&=~(1<<DQ);	//PORT = 0
	DS_DDR|=1<<DQ;		//DDR = Out	
	_delay_us(480);				
	DS_DDR&=~(1<<DQ);	//DDR = In,PORT = 1(ext.pull up = 3k3)
	_delay_us(65);
	PRESEN = 0;
//Pokud je připojeno čidlo PRESEN = 1
	PORT--;
	if((*PORT&(1<<DQ)) == 0)
		{
			PRESEN = 1;	
		}
	_delay_us(480);
}

//Read byte
int Ow_Read(volatile unsigned char *PORT,unsigned char DQ)
{

#define DS_PORT *PORT
PORT--;
#define DS_DDR *PORT

unsigned char i;
unsigned char byte; 
byte = 0;
	for(i=0;i<8;i++)
	 {
		DS_PORT&=~(1<<DQ);	//PORT = 0		
		DS_DDR|=1<<DQ;		//DDR = Out		
		_delay_us(5);	
		DS_DDR&=~(1<<DQ);	//DDR = In,PORT = 1	
		_delay_us(10);
		PORT--;
	 		if((*PORT&(1<<DQ))>0) //Stav PIN
			 {
				byte|=1<<i;		
			 }
		_delay_us(55);
		PORT++;
	 }
	 return byte;
}

// Write byte
void Ow_Write(volatile unsigned char *PORT,unsigned char DQ,unsigned char byte)
{

#define DS_PORT *PORT
PORT--;
#define DS_DDR *PORT

unsigned char i;
	for(i=0;i<8;i++)
	 {
		if((byte&(1<<i)) > 0)
		 {
	          DS_PORT&=~(1<<DQ);	//PORT = 0	
		  DS_DDR|=1<<DQ;	//DDR = Out				  	
		  _delay_us(5);
		  DS_DDR&=~(1<<DQ);	//DDR = In,PORT = 1			  	
		  _delay_us(65);
		 }
		else
		 {
		  DS_PORT&=~(1<<DQ);	//PORT = 0
		  DS_DDR|=1<<DQ;	//DDR = Out			  	
		  _delay_us(60);
		  DS_DDR&=~(1<<DQ);	//DDR = In,PORT = 1	
		  _delay_us(10);
		 }	 	
	 }

}

#endif