https://devzone.nordicsemi.com/f/nordic-q-a/58956/softdevice-not-working-on-bt840-based-custom-boardI have been testing the softdevice codes on NRF52840 DK with NRF52840 SDK 15.2.0 which is working perfectly. But when i put the same test code in our custom board having BT840 it is not working. I am using the Ble_app_template example for s140 as testen-USTelligent Community 13Thu, 12 Mar 2020 04:14:26 GMThttps://devzone.nordicsemi.com/thread/239430?ContentTypeID=1Thu, 12 Mar 2020 04:14:26 GMT137ad170-7792-4731-bb38-c0d22fbe4515:503a9def-2ce7-4ca8-83fe-437856dcb1b2DharmitMistry<p>thanks <a href="https://devzone.nordicsemi.com/members/kenneth">Kenneth</a>&nbsp; i have apply the softdevice clock configuration changes as suggested by u and now it is working perfectly</p> <p>Thanks,</p> <p>Dharmit</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/239383?ContentTypeID=1Wed, 11 Mar 2020 15:37:50 GMT137ad170-7792-4731-bb38-c0d22fbe4515:7cce6d22-0128-4ea2-baa9-0dcffbdf2417Kenneth<p>Hi,</p> <p>The common problem is that the nRF DK is fitted with an external 32kHz crystal, while a custom board may not be.</p> <p>Can you try to change in sdk_config.h:</p> <p><span>#define NRF_SDH_CLOCK_LF_SRC 0<br />#define NRF_SDH_CLOCK_LF_RC_CTIV 16<br />#define NRF_SDH_CLOCK_LF_RC_TEMP_CTIV 2<br />#define NRF_SDH_CLOCK_LF_ACCURACY 1</span></p> <p><span>Best regards,<br />Kenneth</span></p><div style="clear:both;"></div>