> From:         Brian Clewer[SMTP:brianclewer@MISTRAL.CO.UK]
> Sent:         Monday, March 15, 2004 7:55 AM
> To:   PICLIST@MITVMA.MIT.EDU
> Subject:      [PIC:] FFT using a PIC

> Hi all,
> do any of you out there know if there are any web sites documenting how an
> FFT is done using data produced from the A/D converter?  Probably pushing
> the boundary of the PIC a little here, as I know there are quite a few
> calculations to be done.  Ultimately, I would like to find out what is the
> prime frequency and where the side bands are for an oscillation in the
> region of 10-300Hz for a period of about 5 seconds.  Maybe I would be better
> off using a DSP, but I have never used them in the past.

> Here's hoping...:)

> Brian.

AN-542 describes an FFT for the 17C42. The code should give you some ideas
for porting to another processor.

John Power

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