I am trying to implement 32 Point FFT using VDSP in-built function as reference. First I used cfftf_simd.asm residing at “C:\ Program Files\Analog Devices\VisualDSP 5.0\214xx\lib\src\libdsp_src\” to implement 128 point FFT.
void cfftf (float data_real, float data_imag,
float temp_real. float temp_imag,
const float twid_real,
const float twid_imag,
But from the comments provided in the file it is found that 32 point is not possible with that routine. So we used routine in cfft_simd.asm attached herewith,
complex_float *cfft32 (complex_float dm input,
complex_float dm output);
Passing arguments for that routine is input buffer and output buffer address. In the document it is said to keep both buffer of size ‘N’ where N is the FFT points.
In that case whether input buffer should be interleaved with real and imaginary values. Then what we will get in the output buffer.
Expecting a quick response. Thanks in advance.