nRF51822 s130 sd, external interrupt on cscs example

Question

Hello, i am using SDK12.2.0 and SD s130 on a nRF51822 (AC) and i am trying to add an external interrupt on a pin in the cscs ble_peripheral example. The code i am using (and added to example) is this: 
 #include "app_gpiote.h"
#include "nrf_drv_gpiote.h"
#define SENSORPIN 17
uint32_t pulseCounter = 0;

static void in_pin_handler(void){
pulseCounter++;
} 

static void gpio_init(void){
ret_code_t err_code;

err_code = nrf_drv_gpiote_init();
APP_ERROR_CHECK(err_code);

nrf_drv_gpiote_in_config_t in_config = GPIOTE_CONFIG_IN_SENSE_TOGGLE(false);
in_config.pull = NRF_GPIO_PIN_PULLUP;

err_code = nrf_drv_gpiote_in_init(SENSORPIN, &in_config, in_pin_handler);
APP_ERROR_CHECK(err_code);

nrf_drv_gpiote_in_event_enable(SENSORPIN, true);}
 
 Then in the begining of main() i have added this to watch for any resets and initialize the interrupt: 
 SEGGER_RTT_WriteString(0, "Entering main
"); 
 gpio_init();
 
 As soon as gpio_init() is called the MCU resets (Multiple "Entering main" messages).
As you can see the interrupt handler is extremely short, so what am i doing wrong here? I'm trying to solve this on my own for quite some time now. 
 Thanks

MartinBL · Accepted Answer

Hi, It could be that one of the functions in gpio_init() returns an error and sends your code into an error handler function that resets your device. Have you tried debugging like this ? 
 My bet is that you are using the BSP support package with app_button. That library uses GPIOTE as well and initializes the GPIOTE driver before you call gpio_init(). Since you are only allowed to initialize the GPIOTE driver with nrf_drv_gpiote_init() once, it returns an error sending your application into an endless circle of resets.

nRF51822 s130 sd, external interrupt on cscs example

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