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Hi,
I am trying to get the RFFT_f32u() (v1.20) to work with my F28069 Experimenters kit. I have tried with the following code:
#include "DSP28x_Project.h"
#include "CLAShared.h"
#include "FPU.h"
#include "math.h"
#include "float.h"
#define nrSamples 128 //Number of samples/time window
#define FFT_STAGES 7
float32 tempSamples[nrSamples]; //Samples to calculate on
float32 OutBuffer[nrSamples]; //FFT output
float32 TwiddleBuffer[nrSamples]; //Twiddle factors buffer
float32 MagBuffer[nrSamples/2+1]; //FFT magnitude output
RFFT_F32_STRUCT fft;
float32 RadStep = 0.1963495408494f;
float32 Rad = 0.0f;
void main()
{
Uint16 channel,sample,i;
init(); //All initiations
for(i=0; i < nrSamples; i++)
{
tempSamples[i] = sin(Rad) + cos(Rad*2.3567); //Real input signal
Rad = Rad + RadStep;
}
//FFT
fft.InBuf = tempSamples; /* Input data buffer */
fft.OutBuf = OutBuffer; /* FFT output buffer */
fft.CosSinBuf = TwiddleBuffer; /* Twiddle factor buffer */
fft.FFTSize = nrSamples; /* FFT length */
fft.FFTStages = FFT_STAGES; /* FFT Stages */
fft.MagBuf = MagBuffer; /* Magnitude buffer */
RFFT_f32_sincostable(&fft); /* Initialize Twiddle Buffer */
for (i=0; i < nrSamples; i++)
OutBuffer[i] = 0; //Clean up output buffer
for (i=0; i < nrSamples/2; i++)
MagBuffer[i] = 0; //Clean up magnitude buffer
RFFT_f32u(&fft); //Calculate real FFT
RFFT_f32_mag(&fft);
while(1){} //Test the FFT
}
The result is very high positive and negative values in all places in the the OutBuffer, and almost all values in the MagBuffer is 1.#INF.
I have tried with different number of samples and also test align the inbuffer and use RFFT_f32() but with the same result.
Thanks in advance
Martin,
Would it be possible for you to zip the project (specifically the .project and .cdtbuild files) and post it. I can check to see what the problem might be?
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Thanks for your reply,
I think I have solved the problem today. It might have been some problem in the “File Search Path” under “C/C++ Build”.
Thanks