(No answers on the Counter/Timer h/w board, so I'm reposting my question here...)
I'm using NI-DAQmx within Visual Studio 2005 C++ under Windows XP.
I'm NOT using LabView.
I'm making an executable with elevated process priority and wish to have a real-time thread wake up at precision time intervals.
Presently the time interval is 0.1 second (10 Hz).
I'd like the wakeup to have low jitter, a few dozen microseconds or better.
Presently,
I'm using a kludge from previous work, generating a pulse with a 0.1
sec period on one counter and wiring it back to another counter to
measure it.
I use the DAQmxReadCounterU32() function with a
2-second timeout value to pause and then reactivate my thread after the
measurement is complete.
This "works" but the jitter is terrible:
up to as much as 15 milliseconds for a freshly booted PC and up to 2
milliseconds after I enable MultiMedia timer functionality.
What
I want is a DAQmx function that just returns control to my application
immediately following a timer interrupt with optional output wiring of
that timer pulse.
So how do I do this?
