Fft_int
=======

Function description:
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This demo shows how to trigger **FFT interrupt** including FFT calculates completely interrupt, TF stores completely interrupt 
and FFT in working interrupt.

Configure Q31 frequency domain transformation with 16 points:

* Enable global interrupt & register **FFT** interrupt.
* Initialize & configure the **FFT**, the input data means is RIRI.
* Enable the related interrupt.
* Set the address of TF & input data, then loading and start calculation.
* Waiting trigger the related interrupt and enter interrupt service routine.

.. note::
    The golden data just fit for the RTL cofiguration: **FFT Max point is 4096**.

Test result:
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If successfully trigger and enter interrupt service routine, then print pass, if not print fail.

IO connection:
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None