2015-03-02 22:41:04 +00:00
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#ifndef FFT_H
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#define FFT_H
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/* FIX_MPY() - fixed-point multiplication macro.
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This macro is a statement, not an expression (uses asm).
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BEWARE: make sure _DX is not clobbered by evaluating (A) or DEST.
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args are all of type fixed.
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Scaling ensures that 32767*32767 = 32767. */
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#define FIX_MPY(DEST,A,B) DEST = ((long)(A) * (long)(B))>>15
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#define N_WAVE 1024 /* dimension of Sinewave[] */
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#define LOG2_N_WAVE 10 /* log2(N_WAVE) */
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#ifndef fixed
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#define fixed short
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#endif
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extern fixed Sinewave_org[N_WAVE];
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//function prototypes
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fixed fix_mpy_org(fixed a, fixed b);
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int fix_fft_org(fixed *fr, fixed *fi, int m, int inverse);
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2015-03-03 07:19:48 +00:00
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#endif //FFT_H
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