event data for the asynchronous timer

My application uses an asynchronous timer to read analog and digital signals that are then loaded in a thread safe queue. The main part of the application unloads the queue, displays values and updates the locations of graph and also writes data to a file on disk.

Asynchronous timer runs every 40 millisecs, show various updates run 5 times per second and the data is written to a file every second.

Among the data elements is an entry SSI of lifting height, which, at this data rate should be increased to 25mm per second, or 1 mm each scan. I get a lot of variations in this reading, ranging from 0.3 mm to 1.7 mm and these variations seem to occur during updates of the display or the data file is written. I thought that using the async timer I would be safe from Windows Update problems, it runs in a separate thread.

An earlier version used a timer Panel in which I was able to use the event data to show that timer interruptions were indeed affected by the activity of the screen. The async timer event data seem to zeros, whereas the event data of timer Panel that held a version of the hour and the time elapsed since the last interruption of the timer. How can I check that the async timer is interrupted at the right time?

Reminder timer Asyncronus has the same exact structure of the timers UIR one, except for the first parameter, an integer that in the reminder timer UIR, holds the handle of the Panel the timer while it is reserved in the callback of the asynchronous timer. This means that the eventData parameter holds the information on the time elapsed in th eprogram, passed as pointers to values double. To read this information, you must operate this way:

totalTime double, timeFromLastTimer;

totalTime = *(double *) eventData1;      Time to start the program

timeFromLastTimer = *(double *) eventData2;     The last reminder of timer time

Tags: NI Software

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