Provide FFT example with option to connect to I2S (INMP441) input

[timbo100]

Is your feature request related to a problem?

I have been struggling, I apologize, trying to figure out how to match up my I2S input from an INMP441 mic to work with the FFT example (any esp-dsp FFT example!).

I do not develop in Arduino and would not like to ramp down to that at this point.

I have found examples that show how to setup the esp-idf I2S interface and used it to sample sound (I'm trying to detect a tone at a specific frequency) and my data plot is reasonable.

I have run the FFT examples in esp-idf but they generate a artificial data that is not documented.

Please point out or construct an example that shows how hook in an I2S mic: type of structure to be returned with samples, and relationship to size of structure, samples number, etc.

I have modified several example but with my I2S/INMP441 input but the FFT results are invalid.
For example: https://github.com/EfesX/esp32-inmp441-fft-ssd1306 (removed ssd1306 stuff)

Thanks

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