AVR-Chat

At 12:21 AM 8/7/04 -0300, you wrote:
>     Does anyone have a ready made structure to make a "profiler" for a
>program that has the usual embedded structure of some timer routines that
>take quite some time to execute and a small main loop ??
>
>     I have an application where I maybe pretty close to use all CPU time
>available and I would love to find a way to check how close I am without
>having to count all the cycles in all possible paths of the program. That
>get's even harder with the timer interrupts.
>
>     Any ideas ??

Do you want an absolute maximum usage number of just a good estimate?

If you've got a spare pin or two you can get a pretty good idea with a 
logic analyzer,  a oscilloscope. or even a DMM.  Just set the pin high 
during the period you want to measure.  With multiple pins and an 
oscilloscope or logic analyser you can even get a good indication of 
latency sources and the effects of various interrupts.  Has the advantage 
of being simple and relatively non-intrusive (not much of a "Heisenburg" 
effect).

More complicated, read one of your timers on entry to and exit from code 
regions and accumulate the reading for later analysis (maybe min/max/average).

Robert

" 'Freedom' has no meaning of itself.  There are always restrictions,
be they legal, genetic, or physical.  If you don't believe me, try to
chew a radio signal. "

                         Kelvin Throop, III