nrf52840 FPUhttps://devzone.nordicsemi.com/f/nordic-q-a/76750/nrf52840-fpudear all I use nrf52840 to compile a library with floating-point operation. I configured it in my *. Conf CONFIG_ FPU = y, but we can&#39;t find sqrtf, sinf, logf and so on. I know you can use these functions if you include math. H in keil. But how canen-USTelligent Community 13Mon, 28 Jun 2021 13:12:09 GMTRE: nrf52840 FPUhttps://devzone.nordicsemi.com/thread/317498?ContentTypeID=1Mon, 28 Jun 2021 13:12:09 GMT137ad170-7792-4731-bb38-c0d22fbe4515:120b3260-93b4-4392-a114-5d78a295d8f9Marte Myrvold<p>Hi,</p> <p>Could you try setting the following as well?</p> <pre><code>CONFIG_MAIN_STACK_SIZE=2048 CONFIG_SSE=y</code></pre> <p>Which version of NCS are you using?</p> <p>Best regards,</p> <p>Marte</p><div style="clear:both;"></div>RE: nrf52840 FPUhttps://devzone.nordicsemi.com/thread/317281?ContentTypeID=1Fri, 25 Jun 2021 15:03:53 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d468775d-2b48-4921-ba50-711141458c45Liuguofeng<p>Nice to meet&nbsp; you Mrte</p> <p>I added it as you suggested。</p> <p>pri.conf&nbsp;</p> <p><br />CONFIG_FPU=y<br /># CONFIG_FPU_SHARING=y<br />CONFIG_NEWLIB_LIBC=y<br /># CONFIG_NEWLIB_LIBC_NANO=y<br />CONFIG_CBPRINTF_FP_SUPPORT=y</p> <p># Set CONFIG_NEWLIB_LIBC_FLOAT_PRINTF if printf should be able to print float<br />CONFIG_NEWLIB_LIBC_FLOAT_PRINTF=y</p> <p>But&nbsp;the problem remains unsolved。</p> <p>Here is my compilation error section</p> <p><img src="https://devzone.nordicsemi.com/resized-image/__size/320x240/__key/communityserver-discussions-components-files/4/pastedimage1624632967560v1.png" alt=" " /></p> <p>Best regards,</p> <p>Liuguofeng</p><div style="clear:both;"></div>RE: nrf52840 FPUhttps://devzone.nordicsemi.com/thread/317206?ContentTypeID=1Fri, 25 Jun 2021 11:08:28 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e62bd5fc-774a-4b4e-94d7-d095374ef656Marte Myrvold<p>Hi,</p> <p>To enable floating point formatting you must set the following config:</p> <pre>CONFIG_CBPRINTF_FP_SUPPORT=y</pre> <p>Please add this to prj.conf and see if it fixes your issue.</p> <p>Best regards,</p> <p>Marte</p><div style="clear:both;"></div>