[Dspforum] More Lab 5 Questions

[Nenad Uzunovic]

I am trying to use single-precision bit-reverse function and input with 
(double *) is confusing me. From documentation, I understood that 
(double *) stands for two floats i.e complex pair. Just like with two 
shorts being an int in sample function. Common sense, right :)? #$%^@

Though, I still get bogus data on the output. I read documentation in 
fair detail and am not sure where more to go. I think I am passing all 
the data right.

By the way, documentation for cfft references functions that can be 
found in
C:\CCStudio\c6700\dsplib\support\fft
that took me a while to figure out.

In one of the forums online I found that someone was using
bit_rev(current_data, PROCESS_LENGTH);
instead of
DSPF_sp_bitrev_cplx((double*)current_data,
                     bit_rev_index,
                     PROCESS_LENGTH);
I tried it, and this time I did not get a bunch of NANs. Though I don't 
think my plots are correct. I need to investigate this more.

Can we get a little more information about usage of these tools?

Thanks,
Nenad