Subversion Repositories dblclockfft

Here are the bench tests for the pipelined FFT.  In general, there's a

`*_tb.cpp` file corresponding to every unit within the FFT.  Feel free to

try them.

Be aware, however, the [fft_tb](fft_tb.cpp) doesn't truly

check for success--I just haven't gotten to the point of verifying that

the FFT result is *close enough* to the right answer in spite of actually

calculating the right answer.  Instead, it creates a data file that can be

read in Octave via [fft_tb.m](fft_tb.m).  That will show the first test output.

The second and subsequent outputs can be read via `k=k+1;` followed by calling

[plottst](plottst.m).

As another note (before I clean things up more), you'll need the `*.hex` files

in the same directory as the one you call [fft_tb](fft_tb.cpp) or

[fftstage_tb](fftstage_tb.cpp) from.

I expect the IFFT will work: it's just an FFT with conjugate twiddle factors,

although I haven't fully tested it yet.