标签:NI begin end DOTaskHandle -- demo DAQmx ErrorCheck digital
Software controlled digital output
To check it connect digital output(s) to oscilloscope or to card analog input.
program doportlpi; {$mode objfpc}{$H+} uses {$IFDEF UNIX}{$IFDEF UseCThreads} cthreads, {$ENDIF}{$ENDIF} Classes,nidaqmx,SysUtils,StrUtils { you can add units after this }; var DOTaskHandle:TaskHandle; data: byte; written:longint = 0; {************Error handling procedure ***************************************** Example: ErrorCheck(DAQmxCreateAIVoltageChan(AITaskHandle,'Dev0/ai0','',DAQmx_Val_RSE,-10.0,10.0,DAQmx_Val_Volts,NIL),AITaskHandle); *******************************************************************************} procedure ErrorCheck(AError:longint;ATaskHandle:longint); var errBuffer:array[0..2048] of char; begin //get error description if Aerror<>0 then begin DAQmxGetExtendedErrorInfo(@ErrBuffer[0],2048); writeln(PChar(@ErrBuffer[0])); //stop and cleat task if Assigned(@ATaskHandle) then begin DAQmxStopTask(ATaskHandle); DAQmxClearTask(ATaskHandle); end; //stop program Halt; end; end; {*******************MAIN PROGRAM WITH ERROR HANDLING*************************} begin //task create ErrorCheck(DAQmxCreateTask('',@DOTaskHandle),DOTaskHandle); //digital input port create ErrorCheck(DAQmxCreateDOChan(DOTaskHandle,'Dev1/port0','',DAQmx_Val_ChanForAllLines),DOTaskHandle); //task start //no need to start task ErrorCheck(DAQmxStartTask(DOTaskHandle),DOTaskHandle); //for 32-bit digital port use DAQmxReadDigitalU32 function //set 1 on all lines of digital port //change data:=0 to set 0 or use DAQmxResetDevice function to data:=0; ErrorCheck(DAQmxWriteDigitalU8(DOTaskHandle,1,1,10.0,DAQmx_Val_GroupByChannel,@data,@written,Nil),DOTaskHandle); //use DAQmxResetDevice function here to set signal on Low state writeln('number of written samples: ',written); //stop and clear task if DOTaskHandle<>0 then begin DAQmxStopTask(DOTaskHandle); DAQmxClearTask(DOTaskHandle); end; end.
see more to:
ttps://wiki.freepascal.org/NI-DAQmx_and_NI-DAQmx_Base_examples
标签:NI,begin,end,DOTaskHandle,--,demo,DAQmx,ErrorCheck,digital 来源: https://www.cnblogs.com/zzzsj/p/16266834.html
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