/**

* This example shows how to configure GPIO pins as outputs which can also be used to drive LEDs.

* Each LED is set on one at a time and each state lasts 100 milliseconds.

*/

#include <stdbool.h>

#include <stdint.h>

#include <stdio.h>

#include "nrf_delay.h"

#include "nrf_gpio.h"

#define LED_PIN 21

extern void initialise_monitor_handles(void);

int main()

{

uint8_t output_state = 0;

nrf_gpio_pin_dir_set(LED_PIN, NRF_GPIO_PIN_DIR_OUTPUT);

int n = 0;

initialise_monitor_handles();

printf("hello world!\n");

while(++n)

{

printf("round %d\n", n);

nrf_delay_ms(1000);

if (output_state == 1)

nrf_gpio_pin_set(LED_PIN);

else

nrf_gpio_pin_clear(LED_PIN);

output_state = (output_state + 1) & 1;

nrf_delay_ms(100);

}

return 0;

}