Timing

Posted by jbsnyder on
URL: http://elua-development.15.s1.nabble.com/Timing-tp2422112p2422124.html

OK. At least I know my compiler isn't messed up :-)

I'm curious now though whether similarly clocked ARM7 vs AVR vs Cortex-
M3 (ARM Thumb2) vs etc.. do for these types of tests.

-jsnyder

On Feb 18, 2009, at 10:24 AM, Dado Sutter wrote:

> Hello,
>
> On Wed, Feb 18, 2009 at 10:59, James Snyder  
> <jbsnyder at fanplastic.org> wrote:
>
> > On Wed, Feb 18, 2009 at 02:19, James Snyder  
> <jbsnyder at fanplastic.org> wrote:
> >
> So, one of the things I've been doing recently is tracking timing  
> data for adcscope.lua when running it.  I've found certain things  
> that increase or decrease the amount of time spent getting samples,  
> but I hadn't actually checked what the bare minimum time would be  
> for a dry loop like the following:
> >
> > term.clrscr()
> >
> > while 1 do
> >  t1 = tmr.start(0)
> >  t2 = tmr.read(0)
> >  dtime = tmr.diff(0,t2,t1)
> >  term.gotoxy(1,1)
> >  term.putstr(string.format("Time (us): %06d",dtime))
> > end
> >
> > For LM3S6965, I get 79 us.  Is this correct?
>
> 79us exactly in my EK-LM3S8962 too.
> (And I've figured out that you have disabled XMODEM Xfer on your  
> build :)
>
> Abra?osssssssssss
> Dado
>
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--
James Snyder
Biomedical Engineering
Northwestern University
jbsnyder at fanplastic.org
http://fanplastic.org/key.txt
ph: [phone]

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