Data Acquisition Problem

[avijit123]

Hi friends,

I'm using Windows Timer in my VC++ application. But since a few days back i noticed a peculiar problem in my application. The application is unable to acquire data for a period of 100ms and after that it is again coming back to normal operation. This is happening at different instances but every time duration is always near about 100ms. I have checked the software thoroughly and I could not find any bug in the code. Is this a Windows timer problem? If so, what is the way out for me? Kindly, help

[hdanw]

Lets see some code.

Is your timer reintrant?

If your timer is not responding to windows properly then It will be removed from the list of handlers that recieve timer messages.

This would happen if your Timer was ticking away at faster rate than what you are able to process data and realease control back to the os. You would get one tick at t0, and On the second tick at t100ms your first timer action is incomplete, and windows marks the process as non-responsive.

SHOW US SOME CODE.

[avijit123]

[quote=avijit123]Hi friends,
Hello friends,

I'm attaching some part my code. Kindly, go through it and reply if you can make out anything from it. The data I'm acquiring is @ 6ms . Only while going through the log whiles I could make out that 100ms data was missing.

dwCycRunTime = (DWORD)m_Rtc.GetTotalElapsedTime();
int cycle=0;
DWORD time1;
timeVal=0;




while((dwCycRunTime <= (time1+9000)) && !pMw->m_bCancel)
{
insetDacVal[0] = (float)(Vlevel*sin(2.0*PI*freqSinWave*timeVal));
insetDacVal[1]=insetDacVal[0];
m_MiuCmd.DacCommand(2,insetDacNo,insetDacVal);
m_MiuCmd.AcquireDipStatus();

dwCycRunTime = m_Rtc.Wait(dwCycRunTime+5) ;
m_MiuCmd.ReadDip(wDipR,ucDipSts);
fprintf(fDipdata,"%5.2d\t\t",dwCycRunTime );
for(i=0; i<6; i++)
fprintf(fDipdata,"%u\t" ,gMiuSts.wDipData[i]);
fprintf(fDipdata,"\n");
m_MiuCmd.AcquireAdcStatus(gucA323Adc[0][0],&gucA323Adc[0][1]);

dwCycRunTime = m_Rtc.Wait(dwCycRunTime+5);

m_MiuCmd.ReadAdcStatus(gucA323Adc[0][0],fAdcV);
for(i=0; i<gucA323Adc[0][0]; i++)
{
fprintf(gfpLog,"%06.2f\t",gMiuSts.fAdcV[i]);
}
fprintf(gfpLog,"%06.2d\n",dwCycRunTime );
pMw->DoEvents();
UpdateData(FALSE);
timeVal=timeVal+0.01;

LONGLONG CRtcTimer::GetTotalElapsedTime()
{
LONGLONG tmElapsed;
LONGLONG tmCurrent;

if(gucTimerType != TIMER_PC)
{
tmElapsed = (LONGLONG)(GetRtcCnt()*10); // Reset last call
}else
{
QueryPerformanceCounter((LARGE_INTEGER*) &tmCurrent); // What's the time now?
tmElapsed = ((tmCurrent - m_StartTime) * 1000) / m_Freq; // Time since start
m_LastTime = tmCurrent; // Reset last call
m_RunLastTime = gdwTotalRunTimeSec-1; // Reset last call
}
return tmElapsed; // Returned in milisecon

[arnaudk]

I think the problem is that you're missing a main(), and maybe even some function definitions.