#include <bcm2835.h>

#define PIN RPI_GPIO_P1_11
int main(int argc, char **argv)
{
    if (!bcm2835_init())
        return 1;
    // Set the pin to be an output
    bcm2835_gpio_fsel(PIN, BCM2835_GPIO_FSEL_OUTP);
    // Blink
    while (1)
    {
        // Turn it on
        bcm2835_gpio_write(PIN, HIGH);
        // wait
        bcm2835_delay(500);
        // turn it off
        bcm2835_gpio_write(PIN, LOW);
        // wait 
        bcm2835_delay(500);
    }
    bcm2835_close();
    return 0;
}