https://devzone.nordicsemi.com/f/nordic-q-a/15644/nrf52-internal-rc-configurationI&#39;m using the ble_app_template of SDK11. but I dont have an external oscillator, so the run time freeze at ble_stack_init in this answer , the solution is to relace NRF_CLOCK_LFCLKSRC_XTAL_20_PPM by NRF_CLOCK_LFCLKSRC_RC_250_PPM_4000MS_CALIBRATIONen-USTelligent Community 13Tue, 09 Aug 2016 11:48:55 GMThttps://devzone.nordicsemi.com/thread/59744?ContentTypeID=1Tue, 09 Aug 2016 11:48:55 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b784e5cc-e076-402d-b750-8b81258d614eSusheel Nuguru<p>wow three Nordic answers for one question. Makouda you must be really famous :)</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/59746?ContentTypeID=1Tue, 09 Aug 2016 11:26:40 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0ecb07f0-5626-4e74-ba17-fa4e1121bc8aSusheel Nuguru<p>softdevice_handler_init function has changed so that its first argument for clock (nrf_clock_lfclksrc_t) is changed from uint32 to structure defined in nrf_sdm.h</p> <p>so now you have to change your clock to (defined in examples\bsp\pca_xxxx.h)</p> <pre><code>#define NRF_CLOCK_LFCLKSRC {.source = NRF_CLOCK_LF_SRC_RC, \ .rc_ctiv = 16, \ .rc_temp_ctiv = 0, \ .xtal_accuracy = 0} </code></pre> <p>nrf_clock_lf_cfg_t is well documented in nrf_sdm.h</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/59745?ContentTypeID=1Tue, 09 Aug 2016 11:21:05 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0d300a84-a2d4-44cc-a4da-5d1056c411e1Ole Bauck<p>See <a href="https://devzone.nordicsemi.com/question/88582/change-clock-source-nrf52832-app-beacon-example/?answer=88644#post-id-88644">this</a> post.</p><div style="clear:both;"></div>