Rif.: multiple functions in one function

[Kugelkopf]

Hello,

I would like to know how to create a function which involves multiple other funcions in it, so i could simplify my code. For example here is my issue: 

/*
DAQmxErrChk (DAQmxCreateTask("",&taskHandle));
DAQmxErrChk (DAQmxCreateDOChan (taskHandle, "Dev2/port0/line0", "AI0", DAQmx_Val_ChanPerLine));
DAQmxErrChk (DAQmxStartTask(taskHandle));
DAQmxErrChk (DAQmxWriteDigitalLines(taskHandle,1,1,10.0,DAQmx_Val_GroupByChannel,data1,NULL,NULL));
DAQmxStopTask(taskHandle);
DAQmxClearTask(taskHandle);

*/

So how could i manage to use these whole set of functions in only one? I guess i would need another .c file for that but if anyone could give me a concrete example with this, i would appreciate that.

Thank you in advance!

[RobertoBozzolo · Accepted solution]

Despite the fact that those functions pertain to DAQmx driver, there is nothing special with them so you can create your own function where to put them and call it wherever you need it.

As an example:

int MyDigitalOutputFunction (void)
{
  // Declare variables used in the function
  taskHandle
  data1
  error

  // Assign values to data1 if not received from the caller
  data1

  // DAQmx instructions
  DAQmxErrChk (DAQmxCreateTask("",&taskHandle)); 
  DAQmxErrChk (DAQmxCreateDOChan (taskHandle, "Dev2/port0/line0", "AI0", DAQmx_Val_ChanPerLine));
  DAQmxErrChk (DAQmxStartTask(taskHandle));
  DAQmxErrChk (DAQmxWriteDigitalLines(taskHandle,1,1,10.0,DAQmx_Val_GroupByChannel,data1,NULL,NULL)); 
  DAQmxStopTask(taskHandle);
  DAQmxClearTask(taskHandle);

Error:
  return error;
}

Once completed, the above function will set the digital output and return the error found in the function. You will need to declare the function (either directly in the source file or in a global include file you may have designed) before you can call it in your code.

From this point on you may want to modify the function passing some data to it to permit reusing it with other parameters, e.g. the digital line to drive, the value to assign to it... it depends on how you want to use this function throughout your program.

As you can see there is nothing special in this job, so don't let DAQmx scare you and go on designing your application! 

[Kugelkopf]

Thank you very much for your help and quick response!