Hello everyone, My question about FPU. I wanna use stm32f429 with FPU. How can I this? I activated it. Do I should do anything else? Do I need write special code for use FPU? I wish you good work.

[bkorkmazer]

..

[Tesla DeLorean]

In Keil there is a selection box to use the FPU, at that point the compiler uses the appropriate intrinsics, and links to libraries with further support for more complex functions.

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The FPU in the CM4F is only for 32-bit floats​, it doesn't support doubles, or transcendentals.

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GNU/GCC has command line options, and libraries too.​

[bkorkmazer]

I activated the selection box. Do I need to do anything else except that?

Thank you

[Tesla DeLorean]

I think I was pretty clear and concise.

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If you doubt, generate a listing file with something like Keil's FromELF application and inspect the generated code and libraries.

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ie

FromELF -csd foo.axf​ >foo.let

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Code in SystemInit() typically enables the FPU coprocessor​

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[Nikita91]

Do you use an RTOS ?

Does the RTOS manage the float registers on context switch?

Does a single task use floats or more than one?