https://devzone.nordicsemi.com/f/nordic-q-a/29661/nrf51822-s130-sd-external-interrupt-on-cscs-exampleHello, 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 &quot;app_gpiote.h&quot; #include &quot;nrf_drv_gpioteen-USTelligent Community 13Tue, 23 Jan 2018 10:44:02 GMThttps://devzone.nordicsemi.com/thread/117766?ContentTypeID=1Tue, 23 Jan 2018 10:44:02 GMT137ad170-7792-4731-bb38-c0d22fbe4515:02f71ca0-deba-4969-8e0a-9835dd61cdc1MartinBL<p>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 <a href="https://devzone.nordicsemi.com/question/60125/my-device-is-freezing-and-restarting/">debugging like this</a>?</p> <p>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.</p><div style="clear:both;"></div>