[Dspforum] Lab 6 Questions

[Alan Ding]

Maybe this is really obvious but why are we doing N-pt FFTs every N/2
samples and not every N samples where N=8192.  I think there's something
about the algorithm that I'm missing.  Do we have to do anything special
with the data overlapping when we dma back out?

BTW - I resubmitted my milestone after Doug reminded me where in the lab
instructions it showed us to dump data from MATLAB to CCS3.1.  I was having
issues with that Thursday night since I missed that part on the
instructions...ooops.

Thanks,

Alan

On Sun, Oct 18, 2009 at 7:48 PM, Alan Ding <alan33d at gmail.com> wrote:

> Thanks Doug.
>
> I'm also having a tough time locating register definitions from the lecture
> notes:
>
> CIPR
> QOPT...etc.
>
> I found the macros in csl_edmahal.h which was not part of the example
> project.
>
> ~Alan
>
>
> On Sun, Oct 18, 2009 at 7:39 PM, Doug Wenstrand <doug at echelonembedded.com>wrote:
>
>> Yea, I forgot to time it and fill in the requirement.  Your presumption of
>> course is correct -- We want you to use QDMA to do it efficiently, but you
>> need not worry about overlapping the transfers with computations.
>> So -- the following pseudocode is what would meet the timing requirement:
>>
>> loop:
>> dma data in
>> wait for it
>> fft
>> dma data out
>>
>>
>>  On Sun, Oct 18, 2009 at 6:46 PM, Alan Ding <alan33d at gmail.com> wrote:
>>
>>> For the requirements on the back of the lab, it states that our STFT
>>> "must take less than xx ms".  What exactly is xx?  ~1.7ms*100 or ~48ms*100?
>>> I take it you guys want us to get roughly the first timing requirement using
>>> QDMA.
>>>
>>> When we first capture the data in ext ram from CCS.  The instructions
>>> wants us to create a plot of this data in CCS.  How do you do that?  Should
>>> we use the Graph function under the view tab?  What options should we use
>>> for it?
>>>
>>> Thanks,
>>>
>>> --
>>> -------------------------------------------------------
>>> Alan Ding
>>> Master of Sci, Electrical Engineering
>>> Johns Hopkins University
>>>
>>> Email: alan33d at gmail.com
>>> Contact #: 4844593290
>>>
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>>>
>>>
>>
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>>
>
>
> --
> -------------------------------------------------------
> Alan Ding
> Master of Sci, Electrical Engineering
> Johns Hopkins University
>
> Email: alan33d at gmail.com
> Contact #: 4844593290
>



-- 
-------------------------------------------------------
Alan Ding
Master of Sci, Electrical Engineering
Johns Hopkins University

Email: alan33d at gmail.com
Contact #: 4844593290
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