Is there a DAQmx Destroy task?

[Joe09]

Hi,

I'm having problems using DAQmxCreateTask. I want to use the same channel to read a signal using two different functions in CVI.

The first one uses the next function:

WRITE a signal from an array.

 DAQmxErrChk(DAQmxCreateTask("VPSignal", &taskOut));

 DAQmxErrChk(DAQmxCreateAOVoltageChan(taskOut, "DAQboard/ao1",   "VoltageOut", -5, 5,   DAQmx_Val_Volts, ""));
 if (-1 != DAQmx_Val_Cfg_Default)
       DAQmxErrChk(DAQmxSetChanAttribute(taskOut, "VoltageOut", DAQmx_AO_TermCfg,    -1));

 DAQmxErrChk(DAQmxCfgSampClkTiming(taskOut, "",   9960, DAQmx_Val_Rising,   DAQmx_Val_ContSamps, 166));

DAQmxWriteAnalogF64 (taskOut, 166, 1, 1.0, DAQmx_Val_GroupByChannel, sinewave, &sampleswriten, 0);

READ Tthe signal

 DAQmxErrChk(DAQmxCreateTask("", &taskOut));
 
 DAQmxErrChk(DAQmxCreateAIVoltageChan(taskOut, "DAQboard/ai3", "Input1",  DAQmx_Val_RSE, -5, 5, DAQmx_Val_Volts, "")); 

 DAQmxErrChk(DAQmxCreateAIVoltageChan(taskOut, "DAQboard/ai4", "input2",  DAQmx_Val_RSE, -5, 5, DAQmx_Val_Volts, "")); 

 DAQmxErrChk(DAQmxCfgSampClkTiming(taskOut, "",   9960, DAQmx_Val_Rising,   DAQmx_Val_FiniteSamps, 166));

The other function uses the same port to read but the reading is for just one point at the time.

WRITE a value

 DAQmxErrChk(DAQmxCreateTask("Vinput_Task", &taskOut_0));//Creacion de la Tarea para escritura
 DAQmxErrChk(DAQmxCreateAOVoltageChan(taskOut_0, out_ch, "Vinput_Out", -10, 10, DAQmx_Val_Volts, ""));
 if (-1 != DAQmx_Val_Cfg_Default)
       DAQmxErrChk(DAQmxSetChanAttribute(taskOut_0, "Vinput_Out", DAQmx_AO_TermCfg, -1));
 
 DAQmxStartTask(taskOut_0);//Inicia la tarea de generacion de voltaje

//*************

DAQmxErrChk(DAQmxCreateTask("VinputTask", &taskOut));

 DAQmxErrChk(DAQmxCreateAOVoltageChan(taskOut, out_ch, "Vinput_Out", -5, 5, DAQmx_Val_Volts, ""));

DAQmxErrChk(DAQmxCfgSampClkTiming(taskOut, "", 99960, DAQmx_Val_Rising, DAQmx_Val_ContSamps, 1666));

 if (-1 != DAQmx_Val_Cfg_Default)
  DAQmxErrChk(DAQmxSetChanAttribute(taskOut, "Vinput_Out", DAQmx_AO_TermCfg, -1));

DAQmxWriteAnalogF64 (taskOut, numberOfPoints, 1, 1.0, DAQmx_Val_GroupByChannel, buffer,  &sampleswriten, 0);

[Joe09]

I’m having problems using DAQmxCreateTask. I am programming in LabWindows/CVI and I want to use the same channel to acquire a finite signal and just one point(not at the same time!), but using two different functions is causing me error codes:

-200089 Task name specified conflicts with an existent task name

-200088 Task specified is invalid or does not exist

The code I'm using is attached.

 

Can anyone tell me what I’m doing wrong?

Can I use the same channel to acquire a signal and just one measure using different functios without causing conflicts?

I think that using StopTask and ClearTask release memory and resources reserved for those Task, so I can create them again when I need them.

Thanks, I hope anyone can help me?