https://devzone.nordicsemi.com/f/nordic-q-a/9686/problem-in-starting-advertisement-in-gpiote-interruptHi, I&#39;m trying to start advertising in gpiote interrupt. I have modified ble_hrs_demo code. I&#39;m suing nrf51-dk with SDK9 and S110. Here are my code snippets(they are not in order here): static void gpiote_init() { ret_code_t err_code; err_codeen-USTelligent Community 13Mon, 12 Oct 2015 19:02:30 GMThttps://devzone.nordicsemi.com/thread/35820?ContentTypeID=1Mon, 12 Oct 2015 19:02:30 GMT137ad170-7792-4731-bb38-c0d22fbe4515:50ea2f5f-ee20-4bde-8535-da78f3b52deaSusheel Nuguru<p>I do not have the code available to verify, but i think</p> <pre><code>nrf_drv_gpiote_in_config_t in_config = GPIOTE_CONFIG_IN_SENSE_HITOLO(true); </code></pre> <p>This above code If I remember correctly passing true means hi_accuracy, which willrequest the GPIOTE interrupt handler to be in higher priority (priority APP_PRIORITY_HIGH = 1). So your gpiote callback will be called with priority 1 (APP_PRIORITY_HIGH), and it is not allowed to make SVC (sd_xxx) calls in this context, otherwise it will trigger the hardfault.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/35819?ContentTypeID=1Mon, 12 Oct 2015 15:50:59 GMT137ad170-7792-4731-bb38-c0d22fbe4515:33ea0644-dc83-44fd-bd9c-103d8718dda6Lalit Kumar<p>It looks like the problem is with gpiote interrupt. If I try to call any external function, the program either restarts or goes into hardfault handler. I&#39;ve tried disabling gpiote, starting timer, stopping timer. All the codes resulted in the reset of device. Whereas if i change a flag in interrupt handler and read the flag in main loop, and do the changes there, the code works fine.</p><div style="clear:both;"></div>