https://devzone.nordicsemi.com/f/nordic-q-a/87355/program-stalled-while-bluetooth-connectedHi, I am testing the ble_uart_send function. I found the advertising was OK, but when my phone connected to the board, it stalled but no error was shown. I enabled DEBUG and Logs, the program just stopped without any information. Could you help meen-USTelligent Community 13Wed, 27 Apr 2022 07:29:34 GMThttps://devzone.nordicsemi.com/thread/365100?ContentTypeID=1Wed, 27 Apr 2022 07:29:34 GMT137ad170-7792-4731-bb38-c0d22fbe4515:33d46b1d-741f-4651-aecf-731295e1716fVidar Berg<p>Hello,</p> <p>You are getting a hardfault exception and if you continue execution (i.e. press the play button) you should see the program reach the hardfault handler in your application. But it&#39;s difficult to say exactly what triggered the exception based on the screenshot alone. Maybe you have selected a wrong interrupt priority level for the GPIOTE_IRQn? I notice you are calling the notification send function from this ISR, which means the selected priority must be either 5, 6, or 7.</p> <p>From the Softdevice specification document (<span><a title="Application programming interface" href="https://infocenter.nordicsemi.com/topic/sds_s132/SDS/s1xx/overview/api_overview.html?cp=4_7_3_0_3">Application programming interface</a></span>):</p> <p><img src="https://devzone.nordicsemi.com/resized-image/__size/320x240/__key/communityserver-discussions-components-files/4/pastedimage1651044304947v1.png" alt=" " /></p> <p>Best regards,</p> <p>Vidar</p> <p></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/365090?ContentTypeID=1Wed, 27 Apr 2022 07:06:03 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1ed34173-0cdf-4233-bd8f-c9d28e2c6088dfbdfb<p><span>Check this if the above&nbsp;image&nbsp;is not showing:</span></p> <p><img alt=" " src="https://devzone.nordicsemi.com/resized-image/__size/320x240/__key/communityserver-discussions-components-files/4/26880.Capture.PNG" /></p><div style="clear:both;"></div>