LED 깜빡이기

#include <stdbool.h>
#include <stdint.h>
#include "nrf_delay.h"
#include "nrf_gpio.h"
#include "boards.h"  
 
int main(void) {    
    // Configure LED-pins as outputs.        
    nrf_gpio_cfg_output(LED_1);        
    
    // Toggle LEDs.    
    while (true) {            
        nrf_gpio_pin_set(LED_1);      
        nrf_delay_ms(500);            
        nrf_gpio_pin_clear(LED_1);            
        nrf_delay_ms(500);     
    }
}