blue screen with 0x00000050 (0xAF7B....) USB 6211 with rotary encoder

[ytaku]

Hi all, 

I made the attached program to use the rotary encoder to USB6211 ctr0. 

It works well after executing the finite number of for-loops and it shows the rotation angle in real time.

However, if I interrupted the execution (for-loop) by pressing CTRL+C, the system crashed and the blue screen appeared with the following message.

STOP 0x00000050 (0XAF7B1AF4, 0x ....)
nimxdfk.dll
PAGE_FAULT_IN_NO_PAGED_AREA
..
..
..
nimxdfk.dll
Adress DB3C96F0F base at B3C7C000,
Datestamp 4e0e2d19...

Is it the bug of daqmx?

I'm using
Windows XP SP3
Visual C++ 2010
NI-DAQmx Device Driver 9.4.0f1
DAQmx ver 5.0

Thank you for your help...

----

#define DAQmxErrChk(functionCall) if( DAQmxFailed(error=(functionCall)) ) goto Error; else

void testencoder()
{
    int         error=0;
    TaskHandle  taskHandle=0;
    int32       read;
    float64     data[1000];
    char        errBuff[2048]={'\0'};
    int            ix;

    /*********************************************/
    // DAQmx Configure Code
    /*********************************************/
    DAQmxErrChk (DAQmxCreateTask("",&taskHandle));
    DAQmxErrChk (DAQmxCreateCIAngEncoderChan(taskHandle,"Dev3/ctr0","",DAQmx_Val_X4,0,0.0,
        DAQmx_Val_AHighBHigh,DAQmx_Val_Degrees,24,0.0,""));
    //DAQmxErrChk (DAQmxCfgSampClkTiming(taskHandle,"/Dev1/PFI9",1000.0,DAQmx_Val_Rising,DAQmx_Val_ContSamps,1000));

    /*********************************************/
    // DAQmx Start Code
    /*********************************************/
    DAQmxErrChk (DAQmxStartTask(taskHandle));

    printf("Continuously reading. Press Ctrl+C to interrupt\n");
    for( ix=0;ix<1000;ix++)  {
        /*********************************************/
        // DAQmx Read Code
        /*********************************************/
        DAQmxErrChk (DAQmxReadCounterScalarF64(taskHandle,10.0,data, NULL));
        printf("data %f \n", data[0]);
     }
Error:
    if( DAQmxFailed(error) )
        DAQmxGetExtendedErrorInfo(errBuff,2048);
    if( taskHandle!=0 ) {
        DAQmxStopTask(taskHandle);
        DAQmxClearTask(taskHandle);
    }
    if( DAQmxFailed(error) )
        printf("DAQmx Error: %s\n",errBuff);
    printf("End of program, press Enter key to quit\n");
    getchar();
    return ;
}

[ZachHindes]

Hi ytaku,

I was able to reproduce this issue locally here at National Instruments, and I filed CAR 327912 to R&D to do further investigation.  I'll let you know if we come up any workarounds or further information.

Is this issue holding you back or anything?

Sorry for the inconvenience!

[ZachHindes · Accepted solution]

Hello once again,

After some investigation this appears to be the same problem that was identified in this post: http://forums.ni.com/t5/Multifunction-DAQ/Re-nimxdfk-dll-causes-blue-screen/td-p/1752434.  BradK, another R&D developer, identified some potential workarounds.  After deploying one of the workarounds mentioned ("net start nicdcck" in an Administrator command prompt) I wasn't able to reproduce the issue after a handful of attempts.

I hope this helps!

[ytaku]

Hello Zach,

Thank you for your reply.  

I tried "net start nicdcck" and it worked well.  I mean, my program does not crash the system.  

Thank you very much!!