/*
*   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;
    }