clear external interrupt

Question

link text from this post i am generating interrupt using button 3. when i push my button,interrupt generates,LED turn on. but after turning on LED, i want to clear interrupt. so LED become off.here i don't want to use nrf_drv_gpiote_out_toggle(); function. my code is here 
 void gpiote_evt_handler(nrf_drv_gpiote_pin_t pin, nrf_gpiote_polarity_t action)
{
 switch(action)
 {
 case NRF_GPIOTE_POLARITY_HITOLO:
 
 nrf_drv_gpiote_out_clear(LED_3);	
 break;
 default:
 
 break;
 }
}

bjorn-spockeli · Accepted Answer

You have to set the input pin to generate events on both High-to-Low and Low-to-High transitions( NRF_GPIOTE_POLARITY_TOGGLE ). In the event handler you have to check if the pin is set( i.e. HIGH ) or not and based on that clear or set the LED. 
 void gpiote_evt_handler(nrf_drv_gpiote_pin_t pin, nrf_gpiote_polarity_t action)
{
 switch(action)
 {
 case NRF_GPIOTE_POLARITY_TOGGLE:
 if(nrf_drv_gpiote_in_is_set(INTERRUPT_PIN))
 {
 nrf_drv_gpiote_out_set(LED_3);
 }
 else
 {
 nrf_drv_gpiote_out_clear(LED_3);
 }
 break;
 default:
 //do nothing
 break;
 }
}
 
 MAIN: 
 In main you have to configure the input pin to generate the NRF_GPIOTE_POLARITY_TOGGLE event when the pin state is changed. 
 int main(void)
{
 
 ret_code_t ret_code;
 
 // Initialize the GPIOTE Peripheral 
 ret_code = nrf_drv_gpiote_init();
 APP_ERROR_CHECK(ret_code);
 
 // Configure LED_3 pin as output
 nrf_drv_gpiote_out_config_t led_config = GPIOTE_CONFIG_OUT_TASK_LOW;
 
 // Initialize LED_3 pin as output
 ret_code = nrf_drv_gpiote_out_init(LED_3, &led_config);
 APP_ERROR_CHECK(ret_code);
 
 
 
 // Configuration for Interrupt Pin
 nrf_drv_gpiote_in_config_t config =
 {
 .sense = NRF_GPIOTE_POLARITY_TOGGLE, 
 .pull = NRF_GPIO_PIN_PULLUP , 
 .is_watcher = false,
 .hi_accuracy = false
 };
 
 // Initialize Interrupt Pin
 ret_code = nrf_drv_gpiote_in_init(INTERRUPT_PIN, &config, gpiote_evt_handler);
 APP_ERROR_CHECK(ret_code);
 
 // Enable Interrupts from interrupt pin
 nrf_drv_gpiote_in_event_enable(INTERRUPT_PIN,true);
 
 
 while (true)
 {
 // Do nothing.
 }
}