Wei Chang Shen / Motor_Embedded_3rd_emwin

Dependencies:   DMSupport DMemWin

embedded/fft.h@0:08606a13a816, 2016-06-02 (annotated)

Committer:
destinyXfate
Date:
Thu Jun 02 05:04:57 2016 +0000
Revision:
0:08606a13a816
;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
destinyXfate 0:08606a13a816 1 #ifndef _FFT_H_
destinyXfate 0:08606a13a816 2 #define _FFT_H_
destinyXfate 0:08606a13a816 3
destinyXfate 0:08606a13a816 4 // Include complex numbers header
destinyXfate 0:08606a13a816 5 #include "complex.h"
destinyXfate 0:08606a13a816 6 #include "mbed.h"
destinyXfate 0:08606a13a816 7
destinyXfate 0:08606a13a816 8 class CFFT
destinyXfate 0:08606a13a816 9 {
destinyXfate 0:08606a13a816 10 public:
destinyXfate 0:08606a13a816 11 // FORWARD FOURIER TRANSFORM
destinyXfate 0:08606a13a816 12 // Input - input data
destinyXfate 0:08606a13a816 13 // Output - transform result
destinyXfate 0:08606a13a816 14 // N - length of both input data and result
destinyXfate 0:08606a13a816 15 static bool Forward(const complex *const Input, complex *const Output, const unsigned int N);
destinyXfate 0:08606a13a816 16
destinyXfate 0:08606a13a816 17 // FORWARD FOURIER TRANSFORM, INPLACE VERSION
destinyXfate 0:08606a13a816 18 // Data - both input data and output
destinyXfate 0:08606a13a816 19 // N - length of input data
destinyXfate 0:08606a13a816 20 static bool Forward(complex *const Data, const unsigned int N);
destinyXfate 0:08606a13a816 21
destinyXfate 0:08606a13a816 22 // INVERSE FOURIER TRANSFORM
destinyXfate 0:08606a13a816 23 // Input - input data
destinyXfate 0:08606a13a816 24 // Output - transform result
destinyXfate 0:08606a13a816 25 // N - length of both input data and result
destinyXfate 0:08606a13a816 26 // Scale - if to scale result
destinyXfate 0:08606a13a816 27 static bool Inverse(const complex *const Input, complex *const Output, const unsigned int N, const bool Scale = true);
destinyXfate 0:08606a13a816 28
destinyXfate 0:08606a13a816 29 // INVERSE FOURIER TRANSFORM, INPLACE VERSION
destinyXfate 0:08606a13a816 30 // Data - both input data and output
destinyXfate 0:08606a13a816 31 // N - length of both input data and result
destinyXfate 0:08606a13a816 32 // Scale - if to scale result
destinyXfate 0:08606a13a816 33 static bool Inverse(complex *const Data, const unsigned int N, const bool Scale = true);
destinyXfate 0:08606a13a816 34
destinyXfate 0:08606a13a816 35 protected:
destinyXfate 0:08606a13a816 36 // Rearrange function and its inplace version
destinyXfate 0:08606a13a816 37 static void Rearrange(const complex *const Input, complex *const Output, const unsigned int N);
destinyXfate 0:08606a13a816 38 static void Rearrange(complex *const Data, const unsigned int N);
destinyXfate 0:08606a13a816 39
destinyXfate 0:08606a13a816 40 // FFT implementation
destinyXfate 0:08606a13a816 41 static void Perform(complex *const Data, const unsigned int N, const bool Inverse = false);
destinyXfate 0:08606a13a816 42
destinyXfate 0:08606a13a816 43 // Scaling of inverse FFT result
destinyXfate 0:08606a13a816 44 static void Scale(complex *const Data, const unsigned int N);
destinyXfate 0:08606a13a816 45 };
destinyXfate 0:08606a13a816 46
destinyXfate 0:08606a13a816 47 #endif
destinyXfate 0:08606a13a816 48