test

void onewire_tx (uint8_t data)
{
    register uint8_t i=8;
    do
    {
        if (data & 0x80)
        {       // one
            DDRB  |= (1 << _DATAPIN);   // _DATAPIN - pull down
            _delay_us (6);
            DDRB  &= ~(1 << _DATAPIN);  // _DATAPIN - tri-state
            _delay_us (64);
        }
        else
        {       // zero
            DDRB  |= (1 << _DATAPIN);   // _DATAPIN - pull down
            _delay_us (60);
            DDRB  &= ~(1 << _DATAPIN);  // _DATAPIN - tri-state
            _delay_us (10);
        }
        data <<= 1;
    }
    while (--i);
}

/*
uint8_t onewire_rx (void)
{
    uint8_t result = 0x00;
    register uint8_t i=8;
    do
    {
        result <<= 1;
        DDRB  |= (1 << _DATAPIN);   // _DATAPIN - pull down
        _delay_us (6);
        DDRB  &= ~(1 << _DATAPIN);  // _DATAPIN - tri-state
        _delay_us (9);
        if (PINB & (1 << _DATAPIN))
        {
            result |= 0x01;
        }
        _delay_us (55);
    }
    while (--i);
    return result;
}
*/