Arduino and FFT

iq66:
Hi I compiled the code with AVR studio but it gave me 3 compile error. However, they are included in “ffft.h” header file.

fft_input(capture, bfly_buff);

fft_execute(bfly_buff);

fft_output(bfly_buff, spectrum);

How do I get the fundamental frequency from the fft code? I basically need to see the output on the serial terminal. I do not have an lcd display.

Thanx.

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Maybe you forgot to include the FFFT.S file?