kopia lustrzana https://github.com/kosme/arduinoFFT
- Change class name from PlainFFT to arduinoFFT.
- Fix referencies in Readme file. - Exponent is now a public function. - Create another Compute function that takes the exponent as a parameter so it is calculated only once. - Update Revision info.pull/8/head
rodzic
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@ -1 +1,2 @@
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/.project
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/sync.ffs_db
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23
README.md
23
README.md
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@ -6,24 +6,23 @@ Fast Fourier Transform for Arduino
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This is a fork from https://code.google.com/p/makefurt/ which has been abandoned since 2011.
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This is a C++ library for Arduino for computing FFT.
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Tested on Arduino 0022 Alpha.
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Tested on Arduino 1.0.5
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Installation
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--------------------------------------------------------------------------------
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To install this library, just place this entire folder as a subfolder in your
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To install this library, just place this entire folder as a subfolder in your Arduino installation
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When installed, this library should look like:
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Arduino\libraries\PlainFTT (this library's folder)
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Arduino\libraries\PlainFTT\PlainFTT.cpp (the library implementation file, uses 32 bits floats vectors)
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Arduino\libraries\PlainFTT\PlainFTT.h (the library description file, uses 32 bits floats vectors)
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Arduino\libraries\PlainFTT\PlainFTT_INT.cpp (the library implementation file, experimental signed 16 bits vectors)
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Arduino\libraries\PlainFTT\PlainFTT_INT.h (the library description file, experimental signed 16 bits vectors)
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Arduino\libraries\PlainFTT\keywords.txt (the syntax coloring file)
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Arduino\libraries\PlainFTT\examples (the examples in the "open" menu)
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Arduino\libraries\PlainFTT\readme.txt (this file)
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Arduino\libraries\arduinoFTT (this library's folder)
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Arduino\libraries\arduinoFTT\arduinoFTT.cpp (the library implementation file, uses 32 bits floats vectors)
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Arduino\libraries\arduinoFTT\arduinoFTT.h (the library description file, uses 32 bits floats vectors)
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Arduino\libraries\arduinoFTT\keywords.txt (the syntax coloring file)
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Arduino\libraries\arduinoFTT\examples (the examples in the "open" menu)
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Arduino\libraries\arduinoFTT\readme.md (this file)
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Building
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--------------------------------------------------------------------------------
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@ -32,5 +31,5 @@ After this library is installed, you just have to start the Arduino application.
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You may see a few warning messages as it's built.
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To use this library in a sketch, go to the Sketch | Import Library menu and
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select PlainFTT. This will add a corresponding line to the top of your sketch:
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#include <PlainFTT.h> (or #include <PlainFTT_INT.h>
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select arduinoFTT. This will add a corresponding line to the top of your sketch:
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#include <arduinoFTT.h>
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@ -2,6 +2,7 @@
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FFT libray
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Copyright (C) 2010 Didier Longueville
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Copyright (C) 2014 Enrique Condes
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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@ -18,27 +19,32 @@
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*/
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#include "PlainFFT.h"
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#include "arduinoFFT.h"
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#define twoPi 6.28318531
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#define fourPi 12.56637061
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PlainFFT::PlainFFT(void)
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arduinoFFT::arduinoFFT(void)
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{
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/* Constructor */
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}
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PlainFFT::~PlainFFT(void)
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arduinoFFT::~arduinoFFT(void)
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{
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/* Destructor */
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}
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uint8_t PlainFFT::Revision(void)
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uint8_t arduinoFFT::Revision(void)
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{
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return(FFT_LIB_REV);
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}
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void PlainFFT::Compute(double *vReal, double *vImag, uint16_t samples, uint8_t dir)
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void arduinoFFT::Compute(double *vReal, double *vImag, uint16_t samples, uint8_t dir)
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{
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Compute(vReal, vImag, samples, Exponent(samples), dir);
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}
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void arduinoFFT::Compute(double *vReal, double *vImag, uint16_t samples, uint8_t power, uint8_t dir)
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{
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/* Computes in-place complex-to-complex FFT */
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/* Reverse bits */
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@ -59,7 +65,7 @@ void PlainFFT::Compute(double *vReal, double *vImag, uint16_t samples, uint8_t d
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double c1 = -1.0;
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double c2 = 0.0;
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uint8_t l2 = 1;
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for (uint8_t l = 0; (l < Exponent(samples)); l++) {
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for (uint8_t l = 0; (l < power); l++) {
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uint8_t l1 = l2;
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l2 <<= 1;
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double u1 = 1.0;
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@ -93,7 +99,7 @@ void PlainFFT::Compute(double *vReal, double *vImag, uint16_t samples, uint8_t d
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}
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}
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void PlainFFT::ComplexToMagnitude(double *vReal, double *vImag, uint16_t samples)
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void arduinoFFT::ComplexToMagnitude(double *vReal, double *vImag, uint16_t samples)
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{
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/* vM is half the size of vReal and vImag */
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for (uint8_t i = 0; i < samples; i++) {
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@ -101,7 +107,7 @@ void PlainFFT::ComplexToMagnitude(double *vReal, double *vImag, uint16_t samples
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}
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}
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void PlainFFT::Windowing(double *vData, uint16_t samples, uint8_t windowType, uint8_t dir)
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void arduinoFFT::Windowing(double *vData, uint16_t samples, uint8_t windowType, uint8_t dir)
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{
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/* Weighing factors are computed once before multiple use of FFT */
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/* The weighing function is symetric; half the weighs are recorded */
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@ -145,7 +151,7 @@ void PlainFFT::Windowing(double *vData, uint16_t samples, uint8_t windowType, ui
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}
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}
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double PlainFFT::MajorPeak(double *vD, uint16_t samples, double samplingFrequency)
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double arduinoFFT::MajorPeak(double *vD, uint16_t samples, double samplingFrequency)
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{
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double maxY = 0;
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uint16_t IndexOfMaxY = 0;
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@ -165,14 +171,14 @@ double PlainFFT::MajorPeak(double *vD, uint16_t samples, double samplingFrequenc
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/* Private functions */
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void PlainFFT::Swap(double *x, double *y)
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void arduinoFFT::Swap(double *x, double *y)
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{
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double temp = *x;
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*x = *y;
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*y = temp;
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}
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uint8_t PlainFFT::Exponent(uint16_t value)
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uint8_t arduinoFFT::Exponent(uint16_t value)
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{
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/* Computes the Exponent of a powered 2 value */
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uint8_t result = 0;
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@ -2,6 +2,7 @@
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FFT libray
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Copyright (C) 2010 Didier Longueville
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Copyright (C) 2014 Enrique Condes
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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@ -18,8 +19,8 @@
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*/
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#ifndef PlainFFT_h /* Prevent loading library twice */
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#define PlainFFT_h
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#ifndef arduinoFFT_h /* Prevent loading library twice */
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#define arduinoFFT_h
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#if ARDUINO >= 100
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#include "Arduino.h";
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#include "WProgram.h" /* This is where the standard Arduino code lies */
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#endif
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#define FFT_LIB_REV 0x02
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#define FFT_LIB_REV 0x02a
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/* Custom constants */
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#define FFT_FORWARD 0x01
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#define FFT_REVERSE 0x00
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#define FFT_WIN_TYP_FLT_TOP 0x05 /* flat top */
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#define FFT_WIN_TYP_WELCH 0x06 /* welch */
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class PlainFFT {
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class arduinoFFT {
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public:
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/* Constructor */
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PlainFFT(void);
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arduinoFFT(void);
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/* Destructor */
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~PlainFFT(void);
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~arduinoFFT(void);
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/* Functions */
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void ComplexToMagnitude(double *vReal, double *vImag, uint16_t samples);
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void Compute(double *vReal, double *vImag, uint16_t samples, uint8_t dir);
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void Compute(double *vReal, double *vImag, uint16_t samples, uint8_t power, uint8_t dir);
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double MajorPeak(double *vD, uint16_t samples, double samplingFrequency);
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uint8_t Revision(void);
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void Windowing(double *vData, uint16_t samples, uint8_t windowType, uint8_t dir);
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uint8_t Exponent(uint16_t value);
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private:
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/* Functions */
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uint8_t Exponent(uint16_t value);
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void Swap(double *x, double *y);
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};
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