Configuration of Digital Input/Output pins on nRF52

Question

Hello everybody, I'm new to the Nordic system and the nRF52. I'm trying to become familiar with the board and I want to be able to read different 4 input pins, each one attached to the LEDs. In few words, I'm looking to do something like this. 
 if(button_1 pressed)
{
 led_1=on;
}


if(button_2 pressed)
{
 led_2=on;
}


if(button_3 pressed)
{
 led_3=on;
}


if(button_4 pressed)
{
 led_4=on;
}
 
 I have tried the example that comes with the SKD pin_change_int_pca10040 . I have tried to modify the code with no luck. Any advice will be appreciate it. 
 Would I be able to use the following function to change the state of the pin from 0 to 1? 
 
 nrf_drv_gpiote_out_set 
 
 Also, will this one will change the state of the pin from 1 to 0 
 
 nrf_drv_gpiote_out_clear 
 
 How could I read the state change on the pin? 
 Thank you for your help

anfedres · Accepted Answer

I was looking something like this . 
 I have done my own code. Sorry if the question was too simple, sometimes libraries fail starting from the most basic example. 
 #include <stdbool.h>
#include "nrf.h"
#include "nrf_drv_gpiote.h"
#include "app_error.h"
#include "boards.h"


#define GPIO_PIN_17 17
#define GPIO_PIN_18 18
#define GPIO_PIN_19 19
#define GPIO_PIN_20 20

#define GPIO_PIN_27 27
#define GPIO_PIN_28 28
#define GPIO_PIN_29 29
#define GPIO_PIN_30 30

#define S_ON 1
#define S_OFF 0



void gpio_init(void)
{

 // Pins as outputs
 nrf_gpio_range_cfg_input(27,30,NRF_GPIO_PIN_PULLUP);
	
 // Pins as inputs
 nrf_gpio_range_cfg_output(17, 20);
 
}

/**
 * @brief Function for application main entry.
 */
int main(void)
{
 gpio_init();

 while (true)
 {
 
 if(nrf_gpio_pin_read(GPIO_PIN_27))
 {
 nrf_gpio_pin_write(GPIO_PIN_17, S_OFF);
 }
 else
 {
 nrf_gpio_pin_write(GPIO_PIN_17, S_ON);
 }
 
 if(nrf_gpio_pin_read(GPIO_PIN_28))
 {
 nrf_gpio_pin_write(GPIO_PIN_18, S_OFF);
 }
 else
 {
 nrf_gpio_pin_write(GPIO_PIN_18, S_ON);
 }
 
 if(nrf_gpio_pin_read(GPIO_PIN_29))
 {
 nrf_gpio_pin_write(GPIO_PIN_19, S_OFF);
 }
 else
 {
 nrf_gpio_pin_write(GPIO_PIN_19, S_ON);
 }
 
 if(nrf_gpio_pin_read(GPIO_PIN_30))
 {
 nrf_gpio_pin_write(GPIO_PIN_20, S_OFF);
 }
 else
 {
 nrf_gpio_pin_write(GPIO_PIN_20, S_ON);
 }
	
 
 }
}

Configuration of Digital Input/Output pins on nRF52

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