ChibiOS Free Embedded RTOS

Posted: **Fri Oct 16, 2020 10:30 am**

Hello!

I want to use the CMSIS DSP libraries with my STM32F746.

Therefore, I got CMSIS 5 from git and included it with a custom cmsis.mk:

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DSP_ROOT := ./../cmsis/CMSIS/DSP

# List of the CMSIS DSP files
CMSISDSPSRC = ${DSP_ROOT}/Source/$(wildcard */*.c)
CMSISDSPINC = ${DSP_ROOT}/Include ${DSP_ROOT}/Include/dsp

# Shared variables
ALLCSRC += $(CMSISDSPSRC)
ALLINC  += $(CMSISDSPINC)

I include the above file in my main makefile with

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include ./cmsis.mk

The functions are then found in my code, but I get compiler warnings:

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./../cmsis/CMSIS/DSP/Include/arm_math_types.h:102:5: warning: "__ARM_FEATURE_MVE" is not defined [-Wundef]
 #if __ARM_FEATURE_MVE

I assume that I need to tell CMSIS about the feature set of my processor. What is the best way to do it? Is something like this already defined in ChibiOs?

Thanks in advance!

Posted: **Fri Oct 16, 2020 11:00 am**

Hi,

If I remember well that macro has to be defined by the compiler, you need to use the latest ARM GCC. What version are you using? you may also try to define that macro to zero in the makefile.

Giovanni

Posted: **Fri Oct 16, 2020 11:07 am**

Thank you!

Indeed, I was using an old 2016 version of the compiler, due to that bug with STM32F0 series parts.

Switching to the latest 2020 compiler does not define these values either, however the warning changes to

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warning: "__ARM_FEATURE_MVE" is not defined, evaluates to 0 [-Wundef]

I may define it manually then.

Posted: **Fri Oct 16, 2020 11:10 am**

Note that the latest compiler 9.3.1 fixed the problem with M0 cores, it is safe to use.

Giovanni

Posted: **Fri Oct 16, 2020 11:35 am**

That is great to hear, I will use it then.

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