Zephyr tick QIAA vs CKAAhttps://devzone.nordicsemi.com/f/nordic-q-a/93774/zephyr-tick-qiaa-vs-ckaaWe built a prototype board using the nrf52840 QIAA package, then developed a production board using the CKAA package. For some reason the Zephyr system tick is about 5x slower on the CKAA chip. Even the Zephyr &quot;blinky&quot; sample blinks the led 5x sloweren-USTelligent Community 13Fri, 11 Nov 2022 15:15:06 GMTRE: Zephyr tick QIAA vs CKAAhttps://devzone.nordicsemi.com/thread/395372?ContentTypeID=1Fri, 11 Nov 2022 15:15:06 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d6389997-5cc2-4aba-ae39-fea0223f0849Amanda Hsieh<p>Happy to know the issue is fixed.&nbsp;</p> <p>-Aamdna H.</p><div style="clear:both;"></div>RE: Zephyr tick QIAA vs CKAAhttps://devzone.nordicsemi.com/thread/395370?ContentTypeID=1Fri, 11 Nov 2022 15:12:10 GMT137ad170-7792-4731-bb38-c0d22fbe4515:8546b483-258c-4ed6-befa-7887110595b3robonordic<p>Found out that the new board with the CKAA package does not have a 32KHz external oscillator and I needed to switch to the internal one. This is not well documented, but found the answer here:</p> <p>&nbsp;<a href="https://devzone.nordicsemi.com/nordic/nordic-blog/b/blog/posts/nrf5x-support-within-the-zephyr-project-rtos">nRF5x support within the Zephyr Project RTOS</a>&nbsp;</p> <p></p> <p>The magic incantation for Zephyr is:</p> <div style="border:0px none;font-size:inherit;margin:0px 0px 1.5em;padding:0px;vertical-align:baseline;"> <div style="background-color:#f3f2ee;border:0px none;font-size:0.875em;margin:0px;padding:0px;vertical-align:baseline;width:auto;"> <div><span style="color:#1f0909;font-family:&#39;PT Serif&#39;;line-height:1.71429em;">CONFIG_CLOCK_CONTROL_NRF5_K32SRC_RC=y</span></div> <div><span style="color:#1f0909;font-family:&#39;PT Serif&#39;;line-height:1.71429em;">CONFIG_CLOCK_CONTROL_NRF5_K32SRC_250PPM=y</span></div> </div> </div> <p></p><div style="clear:both;"></div>RE: Zephyr tick QIAA vs CKAAhttps://devzone.nordicsemi.com/thread/395340?ContentTypeID=1Fri, 11 Nov 2022 13:57:47 GMT137ad170-7792-4731-bb38-c0d22fbe4515:9d919920-ae4c-4c28-8b3a-b7c1a35b36d1Amanda Hsieh<p>Hi,&nbsp;</p> <p>Which version of NCS are you using? Does is also happen to the latest version?</p> <p>Regards,<br />Amanda H.</p><div style="clear:both;"></div>