Peter Drescher

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10 years, 1 month ago.

Online compiler - wrong compiler flags ?

I try to compile the mbed-rtos. After adding some defines the compiler struggle at HAL_CM4.c unknown opcode 'VSTMDBEQ', maybe wrong target CPU?

The code has to be compiled with : thumb fpu vfpv3

Question relating to:

Last updated: 20 Apr 2021
Affordable and flexible platform to ease prototyping using a STM32F401RET6 microcontroller.

Seems like the 'known' issue that the FPU is not enabled in the F401 code.

posted by Erik - 07 Mar 2014

Yes, it is. I reported it and can enable it . I have been waiting for bcostm response why it was not enabled.

posted by Martin Kojtal 07 Mar 2014

I am having the same problem. I added the defines for the Nucleo F401RE eg defined(TARGET_STM32F401RE) but now the unknown opcodes. Reading on the Keil forum confirms that "\-\-thumb \-\-fpu vfpv3" must be added.

I do not know how to continue, I am new to embed platform. I used to work with gcc/make for years...

Thanks for anyone sharing info, Edwin van den Oetelaar

posted by Edwin Oetelaar, van den 23 Mar 2014

I found no way to get this working with mbed. I have installed a normal toolchain (gcc+make) and can now run multiple threads (using FreeRTOS) and CMSIS/RTOS. Sorry, but if the Nucleo F401RE is not supported/working I can not use the mbed environment or libraries. Somebody should fix the libraries and Nucleo support.

posted by Edwin Oetelaar, van den 10 Apr 2014
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