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标题: 【Urgent Question】 Codewarrior Bug or Code error ? ---About The FFT function [打印本页]

作者: cmouse2008 时间: 2006-3-30 22:54 标题: 【Urgent Question】 Codewarrior Bug or Code error ? ---About The FFT function

【Urgent Question】 Codewarrior Bug or Code error ? ---About The FFT function dfr16RFFT

When i use the function-dfr16RFFT in E to execute a FFT. It doesn't work well,Although i strictly follow the instructions of E's manual ,It does not work well . My code goes following . i'm wondering what's wrong with it ? does Anyone can give me an example of the function dfr16RFFT which give the same result of the answer from Matlab "fft([0.1 0.2 0.3 0.4],8)"

ans =

  1.0000
-0.0414 + 0.7243i
-0.2000 - 0.2000i
  0.2414 + 0.1243i
-0.2000
  0.2414 - 0.1243i
-0.2000 + 0.2000i
-0.0414 - 0.7243i

Thanks A lot!!!!!!!

==============

void main(void)
{
/*** Processor Expert internal initialization. DON'T REMOVE THIS CODE!!! ***/

/*** End of Processor Expert internal initialization. ***/

/* Write your code here */
  dfr16_tRFFTStruct *pRFFT;
Result             res;
Frac16            pX[]={FRAC16(0.1),FRAC16(0.2),FRAC16(0.3),FRAC16(0.4)};
UInt16      options = FFT_SCALE_RESULTS_BY_N;

dfr16_sInplaceCRFFT *pZ=malloc(sizeof(dfr16_sInplaceCRFFT));

E_low_level_init();
pRFFT = dfr16RFFTCreate (8, options); /* N = 8 point RFFT */
res = dfr16RFFT (pRFFT, pX, pZ);

dfr16RFFTDestroy (pRFFT);

for(;

{}
}
=====================

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