88 lines
1.8 KiB
C
88 lines
1.8 KiB
C
//main.c
|
|
|
|
#include "fft.h"
|
|
#include "fft-org.h"
|
|
#include <stdio.h>
|
|
#include <math.h>
|
|
|
|
|
|
//defined by Compile Target
|
|
//#define M 3
|
|
|
|
//number of points
|
|
#define N (1<<M)
|
|
|
|
fixed real[N], imag[N];
|
|
fixed real_org[N], imag_org[N];
|
|
|
|
void show_result(fixed* real, fixed* real_org, fixed* imag, fixed* imag_org, int n)
|
|
{
|
|
int i;
|
|
for (i=0; i<n; i++)
|
|
{
|
|
printf("%d: %d, %d", i, real[i], imag[i]);
|
|
if (real[i] != real_org[i] || imag[i] != imag_org[i]) {
|
|
printf(" expected (%d, %d)", real_org[i], imag_org[i]);
|
|
}
|
|
printf("\n");
|
|
}
|
|
}
|
|
|
|
int main()
|
|
{
|
|
int i;
|
|
for(i=0; i<N; i++)
|
|
{
|
|
real[i] = 1000*cos(i*2*3.1415926535/N);
|
|
real_org[i] = real[i];
|
|
imag[i] = 0;
|
|
imag_org[i] = 0;
|
|
}
|
|
|
|
printf("\nInput Data\n");
|
|
for (i=0; i<N; i++)
|
|
{
|
|
|
|
printf("%d: %d, %d\n", i, real[i], imag[i]);
|
|
}
|
|
|
|
//FFT
|
|
fix_fft(real, imag, M, 0);
|
|
fix_fft_org(real_org, imag_org, M, 0);
|
|
|
|
printf("\nFFT\n");
|
|
show_result(real, real_org, imag, imag_org, N);
|
|
|
|
//IFFT
|
|
fix_fft(real, imag, M, 1);
|
|
fix_fft_org(real_org, imag_org, M, 1);
|
|
|
|
printf("\nIFFT\n");
|
|
show_result(real, real_org, imag, imag_org, N);
|
|
|
|
/*for(i=0; i<N; i++)
|
|
{
|
|
real[i] = 1000*(cos(i*2*3.1415926535/N) + sin(i*2*3.1415926535/N));
|
|
real_org[i] = real[i];
|
|
imag[i] = 0;
|
|
imag_org[i] = 0;
|
|
}
|
|
|
|
//FFT
|
|
fix_fft(real, imag, M, 0);
|
|
fix_fft_org(real_org, imag_org, M, 0);
|
|
|
|
printf("\nFFT2\n");
|
|
show_result(real, real_org, imag, imag_org, N);
|
|
|
|
//IFFT
|
|
fix_fft(real, imag, M, 1);
|
|
fix_fft_org(real_org, imag_org, M, 1);
|
|
|
|
printf("\nIFFT2\n");
|
|
show_result(real, real_org, imag, imag_org, N);*/
|
|
|
|
return 0;
|
|
}
|
|
|