FFT functions

[Arthur]

Hi !

I would like to use FFT with the nrf52. There are some FFT functions in the arm_math.h, but the linker fail :

1> Compiling main.c
1> Linking nrf52832_xxaa.elf
1> Output/nrf52832_xxaa Debug/Obj/main.o: In function `main':
1> C:/nRF5_SDK_11.0.0_89a8197/examples/peripheral/i2s/pca10040/arm5_no_packs/../../main.c:203: undefined reference to `arm_rfft_init_q31'
1> C:/nRF5_SDK_11.0.0_89a8197/examples/peripheral/i2s/pca10040/arm5_no_packs/../../main.c:213: undefined reference to `arm_rfft_q31'
Build failed

And I cant find the libs to add

I use Embedder Studio with the nRF5_SDK_11.0.0_89a8197

Thank you !

Edit : I have the same problem with Keil

[MartinBL]

Hi,

Those functions are inlcuded in the CMSIS-DSP library. I believe you can register for free and download it here.

EDIT: You can also do this.

[Arthur]

Yes, the library was already installed (in both keil and SES).

I didn't know i had to activate the package for each project.

Thanks !