#define DDRB (*(volatile unsigned char *)(0x17 + 0x20))
#define PORTB (*(volatile unsigned char *)(0x18 + 0x20))
unsigned char *led;
void led_on ()
{
PORTB = 0x00;
}
void led_off ()
{
PORTB = 0xff;
}
int main ()
{
int i;
DDRB = 0xff;
for(;;) {
led_on();
for(i = 0; i < 0xffff; i++);
led_off();
for(i = 0; i < 0xffff; i++);
}
return 0;
}