Other Parts Discussed in Thread: CONTROLSUITE
Hi,
I am using TI's C28x Fixed Point DSP Library to do N points FFT with F28335, and the following is my code. My question is how to get the real and imaginary parts from the FFT result? Thanks a lot.
Biao
//-------------------------------------------------------------------------------------------------
// Generate sample waveforms:
Rad = 0.0f;
//Clean up input/output buffer
for(i=0; i < (N*2); i=i+2)
{
ipcb[i] =0;
ipcb[i+1] = 0;
}
//Simulated input signal
for(i=0; i < N; i++)
{
ipcbsrc[i] =(long)(2147483648*(sin(Rad) + cos(Rad*2.3567))/2); //Q31
Rad = Rad + RadStep;
}
//-------------------------------------------------------------------------------------------------
// FFT Calculation
//-------------------------------------------------------------------------------------------------
RFFT32_brev(ipcbsrc, ipcb, N); /* real FFT bit reversing */
fft.ipcbptr=ipcb; /* FFT computation buffer */
fft.magptr=ipcbsrc; /* Magnitude output buffer */
fft.winptr=(long *)win; /* Window coefficient array */
fft.init(&fft); /* Twiddle factor pointer initialization */
fft.calc(&fft); /* Compute the FFT */
fft.mag(&fft); /* Q31 format (abs(ipcbsrc)/2^16).^2 */
