Re: [ECOS] R: [ECOS] Timing with longjmp

[Jonathan Larmour <jifl at eCosCentric dot com>]

Michele Portolan wrote:
> > There is not currently a test to time this.  If you look at the
> > code in 'tm_basic.cxx', you can get a pretty good idea how to measure
> > such [small] quantities.  Basically, you need to capture the current
> > raw clock time (tm_basic uses 'HAL_CLOCK_READ()' for this).  Grab the
> > value before doing the longjump and then after you land in the new
> > location.  Then it's just simple math to figure out how long it took.
> > Again, tm_basic can show you how to convert the values to real time
> > (micro-seconds or whatever).
> >
> > Why are you bothering with such minutia?
>
> I am making some peculiar timing measures on eCos to develop some idea, as I
> said on a precedent post. That is the reason why I am so interested in such
> little things: they could make the difference.

Watch out for HAL_CLOCK_READ wrapping BTW.

Jifl
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eCosCentric    http://www.eCosCentric.com/    The eCos and RedBoot experts
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