#include
#include

/* This seems to produce the right amount of delay for the LED to be
  * seen
  */

void Delay() {
       unsigned char a, b;
       for (a = 1; a; a++)
               for (b = 1; b; b++)
                       ;
}
void LED_On(int i) {
       PORTB = ~BIT(i);  /* low output to turn LED on */
       Delay();
}
void main() {
       int i;
       DDRB = 0xFF;  /* output */
        PORTB = 0xFF;  /* all off */        while (1) {
        /* forward march */
       for (i = 0; i < 8; i++)
               LED_On(i);
       /* backward march */
       for (i = 8; i > 0; i--)
               LED_On(i);
       /* skip */
        for (i = 0; i < 8; i += 2)
               LED_On(i);
       for (i = 7; i > 0; i -= 2)
               LED_On(i);
       }
}