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stm32duino / Arduino_Core_STM32

STM32 core support for Arduino
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DSP functions #682

Closed superpanza closed 5 years ago

superpanza commented 5 years ago

Hello, how can i use the CMSIS-DSP functions? I'm trying to perform an FFT over some samples but i'm not able to import arm_math.h from DSP lib. It does not find any math_arm.h lib from filesystem. I'm pretty sure that the header file is there (view img Screenshot 2019-10-04 11 59 00 ) i'm using a nucleoF401RE board, and i've installed the stm32core via Arduino IDE board manager

fpistm commented 5 years ago

Hi @superpanza Currently, this is not provided. I've already answer this kind of issue here: https://github.com/stm32duino/Arduino_Core_STM32/issues/569#issuecomment-514377729

I think I will add a way to use it.

superpanza commented 5 years ago

Great! Thank you for considering adding the feature. I've just tried to apply the solution you suggest in #569 and now the lib (arm_math.h) is loaded, the code compile successfully, but the linking phase fail with something like

/Users/userino/Library/Arduino15/packages/STM32/tools/arm-none-eabi-gcc/8.2.1-1.7/bin/../lib/gcc/arm-none-eabi/8.2.1/../../../../arm-none-eabi/bin/ld: FFTTest.ino.cpp:(.text._Z6armFFTPfS_i+0x1a): undefined reference to `arm_cmplx_mag_f32'

The prototype of that function is clearly in arm_math.h Any idea on how to move on?

fpistm commented 5 years ago

I guess, you have to add the c source file defining the function in the build: CMSIS/5.5.1/CMSIS/DSP/Source/ComplexMathFunctions/arm_cmplx_mag_f32.c

like I've made for the filtering: https://github.com/fpistm/Arduino_Core_STM32/commit/e891921bd42e9f7819ef0d7004feed4f9ec53f96#diff-766ab07e0a5996a0f67900b49895d65f

fpistm commented 5 years ago

Do not hesitate to provide a small test sketch then I will be able to test when I will implement this request.

fpistm commented 5 years ago

Hi @superpanza I've added the support of CMSIS DSP software library here #685 Could you test it and give me your feedback, please ? Thanks in advance.