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// Preamble
#include <avr/io.h>
#include <util/delay.h>         /* Time delay function */

// Function definitions
#define LED_DDR     DDRB
#define LED_PORT    PORTB

//main function
int main(void)
{
    // Initialization
    LED_DDR = 0b00000001;	    // Set the first pin of Port B as output
    
    // Event loop
    while(1) {
        LED_PORT = 0b00000001;	// Turn on first pin in Port B
        _delay_ms(500);         // Wait 500 ms
    
        LED_PORT = 0b00000000;	// Turn off first pin in Port B
        _delay_ms(500);	        // Wait 500 ms
    }
    return(0);                  // This line is never reached
}