Am Fr,22.08.2008 um 15:52 schrieb Thomas Davie:
On 22 Aug 2008, at 15:47, Negm-Awad Amin wrote:
Am Fr,22.08.2008 um 15:45 schrieb Thomas Davie:
Using a timer isn't too bad. Running at two updates per second
should be acceptable since you're sampling at twice the highest
"event" frequency. You might want to go a bit faster and maybe
at a slightly odd multiple of one second to make sure you don't
end up with a constant half-second lag.
I think, that a higher event-frequency is not neccessary. He
should use an interval of close to one second (something like
0.99 seconds). In his timer method he simply waits in a loop for
the "tick tack" and displays the result. So he will not have a
constant phase shift (except of the drawing interval).
If the system becomes busy (his application doesn't sound like
that), he maybe misses a second. That is acceptable if the system
is busy.
He would miss a second every 100 seconds, whether the system was
busy or not, as the timer fires, finds the time hadn't changed,
and goes back to sleep for another 0.99 seconds.
Bob
»In his timer method he *simply waits in a loop for the "tick
tack"* and displays the result. So he will not have a constant
phase shift (except of the drawing interval).«
Oh, sorry, I assumed you weren't suggesting something ugly >.<
Bob
This is not ugly, but the starting point for a software PLL.
Cheers
Amin Negm-Awad
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