Hi, Hong,
This is the link of the Automotive Math and Motor Control Library Set for KEAx devices.
Real Time Control Embedded Software Motor Control and Power Conversion Libraries|NXP
As you can see that it does not support FFT.
As Mark said that the CMSIS library supports FFT.
Hope it can help you
BR
Xiangjun Rong
Hi
Try the ARM CMSIS DSP libray, including FFT examples.
http://www.utasker.com/docs/uTasker/uTasker_DSP.pdf
Eg. of real-time FFT:https://www.youtube.com/watch?v=n-GABeILGV8&feature=youtu.be
Regards
Mark