#include "config.h"
#include "Port.h"
#include <stdio.h>

#define SET_LED() PORTB &= ~_BV(LEDPIN)
#define CLR_LED() PORTB |= _BV(LEDPIN)

#define DELAY_1S  15

void inline io_init(void)
{
    PORTB |= _BV(LEDPIN); 					//HIGH
    DDRB |= _BV(LEDPIN);  					//OUTPUT
}

void inline timer0_init(void)
{
    TCNT0 = 0;
    TCCR0 = _BV(CS02)|_BV(CS00); 			//FCLK i/o/1024
}

void inline timer0_wait_overflow_clr(void)
{
    loop_until_bit_is_set(TIFR,TOV0);  //wait timer0 overflew

    TIFR |= _BV(TOV0);   					//clear overflew flag
}

void inline delay_1s(void)
{
    uint8 i;

    for (i=0 ;i<DELAY_1S ;i++) 				//delay 1s
    {
        timer0_wait_overflow_clr();
    }
}

void blinky(void)
{
    static uint8 led_flag=0;

    if (led_flag)
    {
        led_flag = 0;
        SET_LED();
    }
    else
    {
        led_flag=1;
        CLR_LED();
    }

}
int main(void)
{
    io_init();
    timer0_init();

    while (1)
    {
        blinky();
        delay_1s();
    }
}