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At this website, I have read that STM32F4 microcontrollers have DSP instructions. To quote:

It also implements a full set of DSP instructions

I am beginning to learn embedded C programming with CooCox CoIDE and STM32F4 Discovery board.

My question is: How do I make use of DSP instructions, when I am writing code in C? Do I need to include some special libraries / functions?

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  • \$\begingroup\$ Simple answer: If the tool-chain provides those functions( or some DSP library) you can use it. So one might need to check the release notes of their tool-chain version(s) for such feature implementation information(s). \$\endgroup\$
    – vyi
    Feb 28, 2014 at 18:46

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How do I make use of DSP instructions, when I am writing code in C? Do I need to include some special libraries / functions?

If you see in Datasheet and User Guide and Refrence manual and Programming manual, you will know that you can't find any part with this name> "DSP(unit)" or "DSP instructions set" because the DSP is not a peripheral! it is a part of core. if you see in Reference Manual and Technical Data Sheet you will see some part like "Chrom-Art Accelerator controller (DMA2D)" that is specialized for image manipulation. YES! this is a part that work by DSP part. the STM32F4 MCUs can work in frequency up to 168 MHz or even 180MHz! then by an special libraries / functions for DSP purpose you can do your job because this clock rate is suitable for this purpose. Enjoy of your MCU, James! :)

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ARM has provided a variety of DSP examples as part of their CMSIS (Cortex-M Software Interface Standard), available at cmsis.arm.com

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