#include <avr/io.h>

#include <util/delay.h>

#include <util/atomic.h>

#include "board.h"

#include "onewire_hal.h"

#define ONEWIRE_LOW()  ONEWIRE_DDR |=  (1<<ONEWIRE)

#define ONEWIRE_HIGH() ONEWIRE_DDR &= ~(1<<ONEWIRE)

#define ONEWIRE_IN     ((ONEWIRE_PIN & (1<<ONEWIRE)) >> ONEWIRE)

bool onewire_reset(void) {

    bool presence;

    ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {

        ONEWIRE_PORT &= ~(1<<ONEWIRE);

        ONEWIRE_LOW();

        _delay_us(480);

        ONEWIRE_HIGH();

        _delay_us(70);

        presence = (ONEWIRE_IN == 0);

        _delay_us(410);

    }

    return presence;

}

inline void onewire_tx1(void) {

    ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {

        ONEWIRE_LOW();

        _delay_us(6);

        ONEWIRE_HIGH();

        _delay_us(64);

    }

}

inline void onewire_tx0(void) {

    ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {

        ONEWIRE_LOW();

        _delay_us(60);

        ONEWIRE_HIGH();

        _delay_us(10);

    }

}

inline uint8_t onewire_rx(void) {

    uint8_t bit;

    ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {

        ONEWIRE_LOW();

        _delay_us(6);

        ONEWIRE_HIGH();

        _delay_us(9);

        bit = ONEWIRE_IN;

        _delay_us(55);

    }

    return bit;

}