kopia lustrzana https://github.com/kosme/arduinoFFT
100 wiersze
3.0 KiB
C++
100 wiersze
3.0 KiB
C++
/*
|
|
|
|
FFT libray
|
|
Copyright (C) 2010 Didier Longueville
|
|
Copyright (C) 2014 Enrique Condes
|
|
|
|
This program is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation, either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
*/
|
|
|
|
#ifndef arduinoFFT_h /* Prevent loading library twice */
|
|
#define arduinoFFT_h
|
|
#ifdef ARDUINO
|
|
#if ARDUINO >= 100
|
|
#include "Arduino.h"
|
|
#else
|
|
#include "WProgram.h" /* This is where the standard Arduino code lies */
|
|
#endif
|
|
#else
|
|
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
#ifdef __AVR__
|
|
#include <avr/io.h>
|
|
#endif
|
|
#include <math.h>
|
|
#include "defs.h"
|
|
#include "types.h"
|
|
#endif
|
|
|
|
#define FFT_LIB_REV 0x14
|
|
/* Custom constants */
|
|
#define FFT_FORWARD 0x01
|
|
#define FFT_REVERSE 0x00
|
|
|
|
/* Windowing type */
|
|
#define FFT_WIN_TYP_RECTANGLE 0x00 /* rectangle (Box car) */
|
|
#define FFT_WIN_TYP_HAMMING 0x01 /* hamming */
|
|
#define FFT_WIN_TYP_HANN 0x02 /* hann */
|
|
#define FFT_WIN_TYP_TRIANGLE 0x03 /* triangle (Bartlett) */
|
|
#define FFT_WIN_TYP_NUTTALL 0x04 /* nuttall */
|
|
#define FFT_WIN_TYP_BLACKMAN 0x05 /* blackman */
|
|
#define FFT_WIN_TYP_BLACKMAN_NUTTALL 0x06 /* blackman nuttall */
|
|
#define FFT_WIN_TYP_BLACKMAN_HARRIS 0x07 /* blackman harris*/
|
|
#define FFT_WIN_TYP_FLT_TOP 0x08 /* flat top */
|
|
#define FFT_WIN_TYP_WELCH 0x09 /* welch */
|
|
/*Mathematial constants*/
|
|
#define twoPi 6.28318531
|
|
#define fourPi 12.56637061
|
|
#define sixPi 18.84955593
|
|
|
|
class arduinoFFT {
|
|
public:
|
|
/* Constructor */
|
|
arduinoFFT(void);
|
|
arduinoFFT(double *vReal, double *vImag, uint16_t samples, double samplingFrequency);
|
|
/* Destructor */
|
|
~arduinoFFT(void);
|
|
/* Functions */
|
|
uint8_t Revision(void);
|
|
uint8_t Exponent(uint16_t value);
|
|
void ComplexToMagnitude(double *vReal, double *vImag, uint16_t samples);
|
|
void Compute(double *vReal, double *vImag, uint16_t samples, uint8_t dir);
|
|
void Compute(double *vReal, double *vImag, uint16_t samples, uint8_t power, uint8_t dir);
|
|
void DCRemoval(double *vData, uint16_t samples);
|
|
double MajorPeak(double *vD, uint16_t samples, double samplingFrequency);
|
|
void Windowing(double *vData, uint16_t samples, uint8_t windowType, uint8_t dir);
|
|
void ComplexToMagnitude();
|
|
void Compute(uint8_t dir);
|
|
void DCRemoval();
|
|
double MajorPeak();
|
|
void Windowing(uint8_t windowType, uint8_t dir);
|
|
|
|
void MajorPeak(double *f, double *v);
|
|
void MajorPeak(double *vD, uint16_t samples, double samplingFrequency, double *f, double *v);
|
|
|
|
|
|
private:
|
|
/* Variables */
|
|
uint16_t _samples;
|
|
double _samplingFrequency;
|
|
double *_vReal;
|
|
double *_vImag;
|
|
uint8_t _power;
|
|
/* Functions */
|
|
void Swap(double *x, double *y);
|
|
};
|
|
|
|
#endif
|