[Dspforum] Lab 5 Question

[Wenstrand, Doug S.]

Alan,

"Use compiler comments, LEDs, or timer code to estimate what you think is the maximal length
filter that you can implement using this method, and design that filter (e.g. in FDAtool.)"

All that was meant by this is that you should use whatever means necessary to determine how fast you think you can run, and hence what the maximal length filter you want to try is.  You could use anything you think is convenient : the comments from the compiler in the ASM which tell you what the "ii" is for your convolution loop, hooking an LED to the scope, or using the on-chip hardware timer.  All three can be used to determine execution time of a section of code, which would give you the data you need.


Doug


-----Original Message-----
From: dspforum-bounces at echelonembedded.com [mailto:dspforum-bounces at echelonembedded.com] On Behalf Of Alan Ding
Sent: Monday, October 12, 2009 10:44 PM
To: dspforum at echelonembedded.com
Subject: Re: [Dspforum] Lab 5 Question

Never mind, I should have realized the "mystery" numbers meant obtainable points for the problem.  Although, I was wondering if we are allowed to do anything and everything from the readings (including optimizations -o flags and disabling sym debug) for both parts of the lab.

> The instructions also mentioned including compiler comments.  Are those
> found in the .asm file?  Or just what's printed from compiler consultant?

Thanks,

Alan

----- Original Message -----
From: Alan Ding <alan33d at gmail.com>
Date: Monday, October 12, 2009 5:24 pm
Subject: [Dspforum] Lab 5 Question
To: dspforum at echelonembedded.com


> >= 1024 taps = 25, >= 800 taps = 20, >= 512 taps = 15, <512 taps = 12
>
> Sample rate not preserved : 0
>
> What do the requirements above mean (from Lab 5)?    Are the numbers after
> the taps in microseconds?  If that's the case, wouldn't the first
> requirement (25) fail to meet our 48kHz deadline?  I was also unsure what
> "sample rate not preserved: 0" means.
>
> The instructions also mentioned including compiler comments.  Are those
> found in the .asm file?  Or just what's printed from compiler consultant?
>
> Thanks,
>
> --
> -------------------------------------------------------
> Alan Ding
> Master of Sci, Electrical Engineering
> Johns Hopkins University
>
> Email: alan33d at gmail.com
> Contact #: 4844593290
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> Dspforum at echelonembedded.com
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