Discarding an Async timer with a DAQ call causes windows to crash.

[eward]

When using a DAQ task inside an Aysnchronous timer and then trying to  discard the timer Windows XP crashes with the blue screen of DEATH with an error saying "BUGCODE_USB_DRIVER".

Here is the sequence of events inside my code in psuedo code.  It is very close how to various NI example codes work

in main:

    DAQmxCreateTask("",&analog_input_task);
    DAQmxCreateAIVoltageChan();
    DAQmxStartTask(analog_input_task);

    NewAsyncTimer();

in timer:

    DAQmxReadAnalogF64

then in the quit function:

    Discard Timer();

    StopTask();

    ClearTask

    QuitUserInterface();

The system crashes when it gets to Discard timer.  If I comment out all the DAQ stuff it wont crash.  If i dont call out the timer it wont crash but the task will not be able to be stopped or cleared.  I am using a NI USB-6009 device.

Message Edited by eward on 01-29-2009 07:37 PM

[Seth_B.]

eward,

Why are you using an asynchronus timer for your acquisition?  Could you point me to the example that uses this timer?

Also, judging from the fact that you are receiving a BSOD on this, it's possible that your driver installation may be corrupt.  Please try downloading DAQmx 8.9 and be sure to install support for LabWindows/CVI.

[eward]

I am using a timer because I want to log the acquistion at deterministic intervals.  Your right though I have not seen an example with the DAQ calls inside a timer, but I have built other projects with similiar calls (DAQ & the timer working together) working fine.  The first thing I thought it was the DAQ drivers as well.  I have reinstalled DAQ several times & now have reinstalled and upgraded to CVI 9.0 as well (DAQ 8.7.2 comes with the 9.0 cd).  thanks for your help

[Seth_B.]

eward,

Could you attach a copy of your code?  I'd like to see if I can reproduce the BSOD on my end and see if I can find you a workaround or fix for this.  Thanks.