Fixed point IQ math vs Single precision floating point for F28335

Rohit Baranwal

Other Parts Discussed in Thread: CONTROLSUITE

I am developing a current controller for a DC/DC converter, with F28335 as a control platform. Since the control loop runs at a high frequency (20 kHz), I need to have the most optimized code. Should I use IQmath, or single precision floating point math? Please advise.

over 9 years ago

0 Gautam Iyer over 9 years ago

Guru 192875 points

Hi Rohit,

In my experience IQMath sometimes performs better than FPU. But again depends case-wise. Personally I prefer IQMath due to flexibility wrt to computation size.

Regards,
Gautam

0 mao peng over 9 years ago

Intellectual 490 points

if the control loop only runs at 20kHz, single precision floating point math, viz. fpu32, is enough.
moreover, you can try to use fastfpu32.lib in controlsuite to accelerate ISR execution.

0 mao peng over 9 years ago in reply to mao peng

Intellectual 490 points

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Fixed point IQ math vs Single precision floating point for F28335