/*
*	DEKLARACE GLOBAL PROMENNYCH
*/

uint64_t ROM_NO = 0;

/*
*	FUNKCE
*/

void first (void)
{
	uint8_t id_bit_number = 0;
	uint8_t id_bit = 0;
	uint8_t cmp_id_bit = 0;
	uint8_t LastDiscrepancy = 0;
	uint8_t LastDeviceFlag = 0;
	uint8_t last_zero = 0;
	
	uint8_t search_direction;
		
	if(therm_reset())
	{
		id_bit_number = 1;
		LastDiscrepancy = 0;
		last_zero = 0;
		
		therm_write_byte(THERM_CMD_SEARCHROM);
			
		for(uint8_t i=0; i<64; i++ )
		{
			id_bit = therm_read_bit();
					
			if(therm_read_bit())
			{
				if(id_bit) return;			// Error no device on bus
				else search_direction = 0;		// 01
				
			}
			else						
			{
				if(id_bit)search_direction = 1;		// 10				
				else					// Discrepancy
				{
					if(id_bit_number > LastDiscrepancy) {last_zero = id_bit_number; search_direction = 0;}
					else if (id_bit_number == LastDiscrepancy) search_direction = 1;
					else search_direction = ROM_NO & ((uint64_t)1 << id_bit_number);
				}
				
			}//konec if(therm_read_bit())

			if(search_direction) ROM_NO |= ((uint64_t)1 << i);
			else ROM_NO &= ~((uint64_t)1 << i);
			
			therm_write_bit(search_direction);
			id_bit_number++;
					
		}//konec foru
		LastDiscrepancy = last_zero;
	}