Basic GPIO usage

[nordicuser91]

Hello All,

Recently I got the nRF 52840 PDK kit and wanted to start with a simple example.

 I tried do the following.

#include "nrf.h"
#include "nrf_gpio.h"
#include "nrf_delay.h"

#define LED1_PIN 13

int main (void)
{
   nrf_gpio_cfg_output(LED1_PIN);
   nrf_gpio_pin_clear(LED1_PIN);
   while(1)
   {
       nrf_gpio_pin_toggle(LED1_PIN);
       nrf_delay_ms(1000);
   }
}

It works but when I use the following it doesn't. Can someone please help me out with the same? I would really appreciate it.

#include "nrf.h"
#include "nrf_gpio.h"
#include "nrf_delay.h"

#define LED1_PIN 13

int main (void)
{
   nrf_gpio_cfg_output(LED1_PIN);
   nrf_gpio_pin_clear(LED1_PIN);
   while(1)
   {
       nrf_gpio_pin_set(LED1_PIN);
       nrf_delay_ms(1000);
       nrf_gpio_pin_clear(LED1_PIN);
   }
}

[Honey]

Hi,

You have to add one extra delay to see the change.

#include "nrf.h"
#include "nrf_gpio.h"
#include "nrf_delay.h"

#define LED1_PIN 13

int main (void)
{
   nrf_gpio_cfg_output(LED1_PIN);
   nrf_gpio_pin_clear(LED1_PIN);
   while(1)
   {
       nrf_gpio_pin_set(LED1_PIN);
       nrf_delay_ms(1000);
       nrf_gpio_pin_clear(LED1_PIN);
       nrf_delay_ms(1000);
   }
}

Regards

Honey

[nordicuser91]

Thanks for help. I think the GPIO peripheral requires some time to update the values on the register.