https://devzone.nordicsemi.com/f/nordic-q-a/28755/difference-between-press-a-reset-button-and-nrfjprog--f-nrf52--rHello, I ported nordic heart rate example to nuttx. I have peer_manager_init() in my codes. After programming the device, I can connect and bond when I issue &quot;nrfjprog -f NRF52 -r&quot;. However, if I press a reset button, it&#39;ll have a hardfault erroren-USTelligent Community 13Fri, 22 Dec 2017 15:44:01 GMThttps://devzone.nordicsemi.com/thread/113943?ContentTypeID=1Fri, 22 Dec 2017 15:44:01 GMT137ad170-7792-4731-bb38-c0d22fbe4515:7f2c3009-70c4-4d3b-afe5-f00a66b4216cMich<p>Thanks, Hung Bui. Your information is very useful. I&#39;ll do more research and debug</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/113942?ContentTypeID=1Fri, 22 Dec 2017 15:00:09 GMT137ad170-7792-4731-bb38-c0d22fbe4515:bf529384-2a01-4b8e-8e75-31c3c0f6f75cHung Bui<p>Hi Mich,</p> <p><code>nrfjprog -r</code> will trigger a softreset via (SysResetReq). if you type &quot;nrfjprog&quot; you can find the description of <code>nrfjprog -r</code></p> <p>The pin reset is the physical pin reset. You can find the difference between different reset source at section 18.8 in the nRF52832 Product Spec.</p> <p>We don&#39;t have much experience with nuttx to help you on why you get the hardfault error. You may want to trace back using <a href="https://devzone.nordicsemi.com/question/41106/how-to-trace-back-hard-fault-handler/">the stack handler</a>.</p><div style="clear:both;"></div>