參考資料: Using GPU_FFT with data Using GPU_FFT with data – part2
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <math.h>
#include <time.h>
#include "mailbox.h"
#include "gpu_fft.h"
int main()
{
int ret, m, l, d, j, k, i, ii, iii, w, freq;
m = mbox_open();
l = 8; //length
d = GPU_FFT_FWD; //direction
j = 255; //jobs
k = 1; //loops
float data[j];
for (i=0; i<j; i++) //loop to make false data set
{
data[i] = i*.00001;
//printf("data[%d] = %f\n", i, data[i]);
}
struct GPU_FFT *fft;
gpu_fft_prepare(m, l, d, j, &fft);
for(i=0; i<k; i++)
{
for(iii=0; iii<j; iii++) //input buffer loop
{
struct GPU_FFT_COMPLEX *in = fft->in + j*fft->step;
/*setting all mem to 0 in order to have guard space between buffers*/
for (ii=0; ii<j+1; ii++)
{
in[ii].re=in[ii].im=0;
}
/*sending data set to input buffer, excluding first and last address so they are still zero*/
freq = iii+1;
in[freq].re = data[iii];
in[j-1].re = 0;
//printf("in[%d].re = %f\n", iii, in[iii].re);
}
gpu_fft_execute(fft);
/*assigning buffer address to pointer out*/
struct GPU_FFT_COMPLEX *out = fft->out+iii*fft->step;
/*attempting to print values of output buffer, should be values created by gpu_fft_execute*/
for(w=0; w<j; w++) //output print loop
{
printf("real out[%d].re = %f\n", w, out[w].re);
}
}
gpu_fft_release(fft);
printf("END END END END END END END END END END END END END END END END END END\n");
return 0;
}
