148 lines
3.7 KiB
C
148 lines
3.7 KiB
C
/*
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UL call demonstrated: ulAOut()
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Purpose: Writes an A/D output channel
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Demonstration: Writes the analog output data to a
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user-specified channel
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Steps:
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1. Call ulGetDaqDeviceInventory() to get the list of available DAQ devices
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2. Call ulCreateDaqDevice() to to get a handle for the first DAQ device
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3. Verify the DAQ device has an analog output subsystem
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4. Call ulConnectDaqDevice() to establish a UL connection to the DAQ device
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5. Enter a value to output for the A/D channel
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6. Call ulAOut() to write a value to an A/D output channel
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7. Call ulDisconnectDaqDevice() and ulReleaseDaqDevice() before exiting the process.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include "uldaq.h"
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#include "utility.h"
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#define MAX_DEV_COUNT 100
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#define MAX_STR_LENGTH 64
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int main(void)
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{
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int descriptorIndex = 0;
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DaqDeviceDescriptor devDescriptors[MAX_DEV_COUNT];
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DaqDeviceInterface interfaceType = ANY_IFC;
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DaqDeviceHandle daqDeviceHandle = 0;
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unsigned int numDevs = MAX_DEV_COUNT;
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int channel = 0;
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Range range = BIP10VOLTS;
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AOutFlag flags = AOUT_FF_DEFAULT;
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int hasAO = 0;
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double min = 0.0;
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double max = 0.0;
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char rangeStr[MAX_STR_LENGTH];
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char * p;
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char dataStr[MAX_STR_LENGTH];
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double data = 0.0;
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UlError err = ERR_NO_ERROR;
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int i = 0;
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int __attribute__ ((unused))ret;
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char c;
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// Get descriptors for all of the available DAQ devices
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err = ulGetDaqDeviceInventory(interfaceType, devDescriptors, &numDevs);
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if (err != ERR_NO_ERROR)
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goto end;
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// verify at least one DAQ device is detected
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if (numDevs == 0)
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{
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printf("No DAQ device is detected\n");
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goto end;
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}
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printf("Found %d DAQ device(s)\n", numDevs);
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for (i = 0; i < (int) numDevs; i++)
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printf(" %s: (%s)\n", devDescriptors[i].productName, devDescriptors[i].uniqueId);
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daqDeviceHandle = ulCreateDaqDevice(devDescriptors[descriptorIndex]);
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if (daqDeviceHandle == 0)
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{
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printf ("\nUnable to create a handle to the specified DAQ device\n");
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goto end;
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}
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// verify the specified DAQ device supports analog output
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err = getDevInfoHasAo(daqDeviceHandle, &hasAO);
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if (!hasAO)
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{
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printf("\nThe DAQ device does not support analog output\n");
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goto end;
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}
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printf("\nConnecting to device %s - please wait ...\n", devDescriptors[descriptorIndex].devString);
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// establish a connection to the device
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err = ulConnectDaqDevice(daqDeviceHandle);
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if (err != ERR_NO_ERROR)
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goto end;
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getAoInfoFirstSupportedRange(daqDeviceHandle, &range, rangeStr);
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ConvertRangeToMinMax(range, &min, &max);
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printf("\n%s ready\n", devDescriptors[descriptorIndex].devString);
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printf(" Function demonstrated: ulAOut()\n");
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printf(" Channel: 0\n");
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printf(" Range: %s\n\n", rangeStr);
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printf("\nHit ENTER to continue\n");
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ret = scanf("%c", &c);
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// clear the display
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ret = system("clear");
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while(err == ERR_NO_ERROR && !enter_press())
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{
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// reset the cursor to the top of the display and
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// show the termination message
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cursorUp();
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clearEOL();
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resetCursor();
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printf ("Enter a value between %f and %f volts (or non-numeric character to exit): ", min, max);
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ret = scanf ("%s", dataStr);
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strtod(dataStr, &p);
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if (*p != '\0')
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break;
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data = atof(dataStr);
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err = ulAOut(daqDeviceHandle, channel, range, flags, data);
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usleep(100000);
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}
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end:
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// disconnect from the DAQ device
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ulDisconnectDaqDevice(daqDeviceHandle);
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// release the handle to the DAQ device
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ulReleaseDaqDevice(daqDeviceHandle);
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if(err != ERR_NO_ERROR)
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{
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char errMsg[ERR_MSG_LEN];
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ulGetErrMsg(err, errMsg);
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printf("Error Code: %d \n", err);
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printf("Error Message: %s \n", errMsg);
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}
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return 0;
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}
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