https://devzone.nordicsemi.com/f/nordic-q-a/66921/about-optimiseHi,All: As my source code below: that whole &quot;for&quot; statement would be optimised.en-USTelligent Community 13Wed, 04 Nov 2020 02:05:23 GMThttps://devzone.nordicsemi.com/thread/278346?ContentTypeID=1Wed, 04 Nov 2020 02:05:23 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ea2e810b-a1f2-422d-8469-052b71d95831wzszzxj<p>Hi,Turbo:</p> <p>&nbsp; &nbsp; &nbsp; &nbsp;Thank you for reply, Pls close this topic,thank you!&nbsp;</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/273978?ContentTypeID=1Fri, 09 Oct 2020 09:31:58 GMT137ad170-7792-4731-bb38-c0d22fbe4515:75a1a0a8-5722-4725-9433-a2671c5c3b97Turbo J<p>Not recommended. It will produce a different delay for different compiler optimization options.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/273975?ContentTypeID=1Fri, 09 Oct 2020 09:29:07 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2fb4c19e-aec9-46ed-86ab-2a98fb78b05fhmolesworth<p>or try:</p> <p><pre class="ui-code" data-mode="c_cpp"> for(volatile uint32_t VAR1=0;VAR1&lt;10000;VAR1++) { }</pre></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/273967?ContentTypeID=1Fri, 09 Oct 2020 09:19:18 GMT137ad170-7792-4731-bb38-c0d22fbe4515:158a6962-7560-46d2-bded-38b390728348Turbo J<p>Yes, the C optimizer will eliminate the empty loop.</p> <p>If you wanted a delay, use nrf_delay_us() or nrf_delay_ms() functions.</p><div style="clear:both;"></div>