Raspberry Pi - BCM2835 - Getting to blinky

blinky.c

// blinky.c
//
// gcc -o blinky blinky.c -l bcm2835
// must be run as root
// sudo ./blinky

#include <bcm2835.h>

// Blinks on RPi Plug P1 pin 13 (which is GPIO pin 21)
#define PIN RPI_GPIO_P1_13

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);
    
    while (1)
    {
        // Turn it on
        bcm2835_gpio_write(PIN, HIGH);
        bcm2835_delay(500);
        bcm2835_gpio_write(PIN, LOW);
        bcm2835_delay(500);
    }
    bcm2835_close();
    return 0;
}