How do I use button Push Interrupt

[GunMin]

I want to change Variable state( 0->1 or 1->0) when I push the button.

I was searching for example relating to the GPIO.

but I did not find that i want.

Everything is a timer example

I would like to implement a function that operates when just press a button(using a interrupt).

You can do the advice would be appreciated.

I'd like to get help on how to implement.

What should I do?

I use nrf51822-DK and small button.

[Stian Røed Hafskjold]

You can use the GPIOTE module (nRF51 Series Reference Manual section 14). Here is a small example that will toggle a LED when you push a button:

#include "nrf_gpiote.h"
#include "boards.h"

#define GPIOTE_CHANNEL_0 0

// Interrupt handler
void GPIOTE_IRQHandler(){
	  nrf_gpio_pin_toggle(BSP_LED_0);
	  NRF_GPIOTE->EVENTS_IN[0] = 0;
}

int main(void)
{
    nrf_gpio_cfg_output(BSP_LED_0);  //Configure LED 0 as output
	nrf_gpio_cfg_input(BSP_BUTTON_0,BUTTON_PULL); //Configure button 0 as input
    //Configure GPIOTE channel 0, to generate an event from button 0:
	nrf_gpiote_event_config(GPIOTE_CHANNEL_0, BSP_BUTTON_0, NRF_GPIOTE_POLARITY_HITOLO); 
	NRF_GPIOTE->INTENSET = GPIOTE_INTENSET_IN0_Enabled; //Set GPIOTE interrupt register on channel 0
	NVIC_EnableIRQ(GPIOTE_IRQn); //Enable interrupts
    for(;;){}
}

[Nour_l]

Hi , sorry fo bothering in here but I had a question about this ... being a beginner I copied the code as it is (I've changed the nrf_gpiote_event_configure ) and yet it didn't work : it says something about a duplicated definition of the GPIOTE_IRQHandler() so I'm wondering how to solve that knowing that I've already tried to delete the default definition of that function and yet the led didn't respond to the button's press