hi,
I want to do FFT in DSP C6455. so i download the "dsplib_c64Px_3_1_0_0_Win32.exe",and installed it .
when i run the example in directory "C:\Program Files\Texas Instruments\dsplib_c64Px_3_1_0_0\examples", the result of DSP_fft16x16(w_16x16, N, x_16x16, y_16x16) is wrong , but the result of DSP_fft16x32(w_16x32, N, x_16x32, y_16x32) and DSP_fft32x32(w_32x32, N, x_32x32, y_32x32) is right。
I doubt there is something wrong with the function gen_twiddle_fft16x16(w_16x16, N) or DSP_fft16x16(w_16x16, N, x_16x16, y_16x16).I can not find the source code of DSP_fft32x32(w_32x32, N, x_32x32, y_32x32), Is anyone knew where is it or used it successfully?
PS :the code of gen_twiddle_fft16x16(w_16x16, N) is follow:
int gen_twiddle_fft16x16(short *w, int n)
{
int i, j, k;
double M = 32767.5;
for (j = 1, k = 0; j < n >> 2; j = j << 2) {
for (i = 0; i < n >> 2; i += j << 1) {
w[k + 3] = d2s(M * cos(2.0 * PI * (i + j) / n));
w[k + 2] = d2s(M * sin(2.0 * PI * (i + j) / n));
w[k + 1] = d2s(M * cos(2.0 * PI * (i ) / n));
w[k + 0] = d2s(M * sin(2.0 * PI * (i ) / n));
k += 4;
}
}
w[k + 3] = w[k - 1];
w[k + 2] = w[k - 2];
w[k + 1] = w[k - 3];
w[k + 0] = w[k - 4];
k += 4;
return k;
}
