https://devzone.nordicsemi.com/f/nordic-q-a/21216/cannot-boot-after-power-off-onI&#39;m trying to program Sparkfun nRF52832 board using SWD (via nRF52 DK). I&#39;ve erased original bootloader/softdevice/app and programmed S132 and my app. The app works, but only until power is disconnected and connected again.Then the blue led (pin 7) staysen-USTelligent Community 13Fri, 07 Apr 2017 16:40:34 GMThttps://devzone.nordicsemi.com/thread/83015?ContentTypeID=1Fri, 07 Apr 2017 16:40:34 GMT137ad170-7792-4731-bb38-c0d22fbe4515:8a729979-40d7-41ad-9449-31992448dcddrastik<p>Thank you for pointing that out, I didn&#39;t check that in the specs.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/83014?ContentTypeID=1Fri, 07 Apr 2017 16:32:55 GMT137ad170-7792-4731-bb38-c0d22fbe4515:20e657f1-dfa4-4f6d-9a02-214ce3647363Wojtek<p>You are using sparkfun nrf52832 breakout board? It does not have parts needed for dc/dc powering (inductor). That is the reason why dc/dc (and whole module) does not work i think.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/83013?ContentTypeID=1Fri, 07 Apr 2017 16:29:02 GMT137ad170-7792-4731-bb38-c0d22fbe4515:144af996-a39e-49a9-8a91-54735b73dc7brastik<p>I&#39;ve found the problem, even though I don&#39;t understand the reason yet. The line that causes the problem is:</p> <pre><code>NRF_POWER-&gt;DCDCEN = 1; </code></pre> <p>DCDC is enabled at the beginning of execution and even though it works on DK, it causes problems on the Sparkfun board.</p><div style="clear:both;"></div>