Аналоговый вывод

#include <utility.h>

#include <NIDAQmx.h>

#include <ansi_c.h>

#include <cvirte.h>

#include <userint.h>

#include "ContGen.h"

static int panelHandle;

char chan[256];

TaskHandle taskHandle=0;

int waveformType;

double min,max,frequency,rate,amp;

uInt32 sampsPerCycle;

float64 cyclesPerBuffer;

uInt32 bufferSize;

bool32 done=0;

int32 written;

int i,rr;

double data[20000];

int main (int argc, char *argv[])

{

if (InitCVIRTE (0, argv, 0) == 0)

return -1; /* out of memory */

if ((panelHandle = LoadPanel (0, "ContGen.uir", PANEL)) < 0)

return -1;

DisplayPanel (panelHandle);

RunUserInterface ();

DiscardPanel (panelHandle);

return 0;

}

int CVICALLBACK StartCallback (int panel, int control, int event,

void *callbackData, int eventData1, int eventData2)

{

switch (event)

{

case EVENT_COMMIT:

GetCtrlVal(panel,PANEL_CHANNEL,chan);

GetCtrlVal(panel,PANEL_MINVAL,&min);

GetCtrlVal(panel,PANEL_MAXVAL,&max);

GetCtrlVal(panel,PANEL_AMP,&amp);

SetCtrlAttribute(panel,PANEL_GRAPH,ATTR_XAXIS_GAIN,1.0/rate);

for (i=0;i<100;i++) { data[i]=0;}

DAQmxCreateTask("",&taskHandle); DAQmxCreateAOVoltageChan(taskHandle,chan,"",min,max,DAQmx_Val_Volts,NULL);

DAQmxStartTask(taskHandle);

for (i=0;i<100;i++){ data[i]=i/20.0;

DAQmxWriteAnalogScalarF64 (taskHandle, 1, 1.0, data[i], 0);

DeleteGraphPlot(panel,PANEL_GRAPH,-1,VAL_DELAYED_DRAW);

PlotY(panel,PANEL_GRAPH,data,100,VAL_DOUBLE,VAL_THIN_LINE,VAL_EMPTY_SQUARE,VAL_SOLID,1,VAL_RED);

Delay(0.05);

}

SetCtrlAttribute(panel,PANEL_START,ATTR_DIMMED,1);

ProcessDrawEvents();

DAQmxStopTask(taskHandle);

DAQmxClearTask(taskHandle);

break;

}

return 0;

}

int CVICALLBACK StopCallback (int panel, int control, int event,

void *callbackData, int eventData1, int eventData2)

{

switch (event)

{

case EVENT_COMMIT:

QuitUserInterface (0);

break;

}

return 0;

}

Пример панели интерфейса пользователя приведен на рис. 66.

Рис. 66

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