I have NI-DAQmx Base 3.2 installed on a 10.4.11 system. One of the example files "genVoltage.c" calls DAQmxBaseWriteAnalogF64. I've been able to compile and run this example with a USB-6009.
Would the DAQmxBaseWriteAnalogF64 function work for you?
My guess is that since you can write a scalar value with DAQmxBaseWriteAnalogF64, DAQmxBaseWriteAnalogScalarF64 becomes redundant. The example that came with installation shows how to write a single value (i.e. scalar). I pasted NI's code below.
int main(int argc, char *argv[])
{
// Task parameters
int32 error = 0;
TaskHandle taskHandle = 0;
char errBuff[2048]={'\0'};
// Channel parameters
char chan[] = "Dev1/ao0";
float64 min = 0.0;
float64 max = 5.0;
// Timing parameters
uInt64 samplesPerChan = 1;
// Data write parameters
float64 data = 3.25;
int32 pointsWritten;
float64 timeout = 10.0;
DAQmxErrChk (DAQmxBaseCreateTask("",&taskHandle));
DAQmxErrChk (DAQmxBaseCreateAOVoltageChan(taskHandle,chan,"",min,max,DAQmx_Val_Volts,NULL));
DAQmxErrChk (DAQmxBaseStartTask(taskHandle));
DAQmxErrChk (DAQmxBaseWriteAnalogF64(taskHandle,samplesPerChan,0,timeout,DAQmx_Val_GroupByChannel,&data,&pointsWritten,NULL));
Error:
if( DAQmxFailed(error) )
DAQmxBaseGetExtendedErrorInfo(errBuff,2048);
if( taskHandle!=0 ) {
DAQmxBaseStopTask(taskHandle);
DAQmxBaseClearTask(taskHandle);
}
if( DAQmxFailed(error) )
printf("DAQmxBase Error: %s\n",errBuff);
return 0;
}
Hope this helps!!
