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#include "stdlib.h"

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//#include "switch.h"

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#include <avr/io.h>

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#include <avr/interrupt.h>

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byte switch_mask;

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byte switch_status;

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byte switch_state;

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ISR(PCINT0_vect)

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{

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    switch_status = 1;

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    switch_state = PINB;

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}

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ISR(PCINT1_vect)

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{

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    switch_status = 1;

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    switch_state = PINC;

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}

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ISR(PCINT2_vect)

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{

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    switch_status = 1;

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    switch_state = PIND;

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}

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byte switch_read (byte *sp)

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{

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    if (!switch_status)

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        return 0;

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    switch_status = 0;

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    *sp = ~switch_state & switch_mask;

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    return 1;

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}