#include <wiringPi.h>
#include <stdio.h>

#define LED 12

int main(void) {
	
	if(wiringPiSetupPhys() == -1) {
		printf("setup wiringPI failed!");
		return 1;
	}
	
	printf("linker LedPin: GPIO %d (wiringPi pin)\n",LED);
	
	pinMode(LED,OUTPUT);
	
	while(1) {
		digitalWrite(LED,LOW);
		printf("led on...\n");
		delay(500);
		digitalWrite(LED, HIGH);
		printf("...led off\n");
		delay(500);
	}
	
}