https://devzone.nordicsemi.com/f/nordic-q-a/13724/fft-functionsHi ! I would like to use FFT with the nrf52. There are some FFT functions in the arm_math.h, but the linker fail : 1&gt; Compiling main.c 1&gt; Linking nrf52832_xxaa.elf 1&gt; Output/nrf52832_xxaa Debug/Obj/main.o: In function `main&#39;: 1&gt; C:/nRF5_SDK_11en-USTelligent Community 13Tue, 31 May 2016 12:42:44 GMThttps://devzone.nordicsemi.com/thread/52448?ContentTypeID=1Tue, 31 May 2016 12:42:44 GMT137ad170-7792-4731-bb38-c0d22fbe4515:8e0e4ed8-0a40-4481-84ab-7ae09ccd0f07Arthur<p>Yes, the library was already installed (in both keil and SES).</p> <p>I didn&#39;t know i had to activate the package for each project.</p> <p>Thanks !</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/52447?ContentTypeID=1Tue, 10 May 2016 11:27:43 GMT137ad170-7792-4731-bb38-c0d22fbe4515:5de5ff71-14f9-4704-9ee5-48dfd7f8112bMartinBL<p>Hi,</p> <p>Those functions are inlcuded in the <a href="http://www.keil.com/pack/doc/CMSIS/DSP/html/index.html">CMSIS-DSP library</a>. I believe you can register for free and download it <a href="https://silver.arm.com/">here</a>.</p> <p>EDIT: You can also do <a href="https://devzone.nordicsemi.com/question/80801/using-cmsis-dsp-library-on-sdkv11/">this</a>.</p><div style="clear:both;"></div>