https://devzone.nordicsemi.com/f/nordic-q-a/55400/timeslot-request-leads-to-hardfaultHello Community, I want to request a timeslot with sd_radio_session_open(). Whenever i call this API function, the Application crashes with a HardFault. I have no idea what is causing this issue. Any ideas?en-USTelligent Community 13Mon, 09 Dec 2019 11:14:53 GMThttps://devzone.nordicsemi.com/thread/224391?ContentTypeID=1Mon, 09 Dec 2019 11:14:53 GMT137ad170-7792-4731-bb38-c0d22fbe4515:75358ad3-5974-477d-96f7-9c94beb13fb4sewes<p>Ups...You&#39;re right. I missed this fact.</p> <p></p> <p>Thank you very much :-)</p> <p></p> <p>Problem solved!</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/224381?ContentTypeID=1Mon, 09 Dec 2019 10:55:57 GMT137ad170-7792-4731-bb38-c0d22fbe4515:996399aa-946e-4d4a-acc4-0e7861f817e8Susheel Nuguru<p>you cannot call any sd_xxx related calls from the interrupt context which are higher in priority than the SVC call.</p> <p>As you can see <a href="https://infocenter.nordicsemi.com/index.jsp?topic=%2Fsds_s132%2FSDS%2Fs1xx%2Fprocessor_avail_interrupt_latency%2Fexception_mgmt_sd.html&amp;cp=4_5_2_0_15_1">here</a>&nbsp;that SVC interrupt priority on nRF52832 is set to 4. And if your interrupt handler from where you are calling sd_xxx function has a priority higher (lower in actual number = higher priority on ARM core) then it would generate a hardfault.</p><div style="clear:both;"></div>