Need quick help, please!!! How do I scan the counter and analog channel in parallel, synchronized?
Hi,
I'm using LabView6.1 and a PCI6014 DAQ card.
I have to scan simultaneously an analog channel and the counter on the card. My project requires me to measure in parallel a force (a voltage on an analog channel) in correspondence to a distance (measured with a counter) and I have to display a force-distance graph.
So, can someone please tell me how can I program the counter and an analog channel to take 1000 measurements in parallel, and then, by reading the buffers to have two sets of corresponding measurements?
I've tried some things and I've got only an error message, that says that there is no free DMA channel available (the error comes from configuring
the analog channel). I attached one of these programs that gives this error, maybe somebody can tell me what I do wrong.
If somebody could send me an example (in LabView6, I have no 7 :-( ), I would be grateful.
Thank you,
pixooxiq
Attachments:
Scan_Test_4.vi 177 KB
Hi pixooxiq,
unfortunately, your Card has only one DMA-Channel.
If you want to use two Channels simutaneously, you have to tell one of them to use an Interrupt instead.
This option can be set with the "Set DAQ Device Information.VI"
Just see the Bitmap, I've attached.
Perhaps, you now get Performance-problems, cause the IRQ does not directly write the Data but involves the CPU. In this case the only possibillity is to use an other card with more than 1 DMA-Channel...
Regards
Peter Weber
NI Germany
Attachments:
Interrupt2.bmp 159 KB
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Here is my code... I know it's long, but it's simple. The only part I'm having trouble with is the very end. You don't really have to know what point of this to help me figure out the problem. Near the very bottom, you'll see the line "double refund = (startcancount/startendcount)*premium;". For some reason, this keeps coming out as zero, even though I run it through the debugger and every single one of the variables has a non-zero value. I cannot figure it out. I tried changing the data type to float to no avail. What is the problem!?
package isys202p1;
import javax.swing.JOptionPane;
public class ISys202P1 {
public static void main(String[] args) {
//Initialized variables for storing the string values of the entered names, premium
String firstname;
String middlename;
String lastname;
String response = null;
double premium = 0;
int startyear = 0;
int startmonth = 0;
int startday = 0;
int endyear = 0;
int endmonth = 0;
int endday = 0;
int canyear = 0;
int canmonth = 0;
int canday = 0;
int startendcount = 0;
int startcancount = 0;
String ssmonth = null;
String esmonth = null;
String csmonth = null;
//Prompts user for first name and stores it in the string variable firstname
firstname = JOptionPane.showInputDialog("Please enter your first name:");
//Prompts user for middle name and stores it in the string variable middlename
middlename = JOptionPane.showInputDialog("Please enter your middle name");
//Prompts user for last name and stores it in the string variable lastname
lastname = JOptionPane.showInputDialog("Please enter your last name:");
//Prompts the user for a premium amount, without the dollar sign, and assigns to the premium variable
response = JOptionPane.showInputDialog("Please enter your premium amount: $");
premium = Double.parseDouble(response);
//Prompts the user for the starting date of the policy term (year)
response = JOptionPane.showInputDialog("Please enter the starting date for the policy term (year)");
startyear = Integer.parseInt(response);
//Prompts the user for the starting date of the policy term (month)
response = JOptionPane.showInputDialog("Please enter the starting date for the policy term (month)");
startmonth = Integer.parseInt(response);
//Prompts the user for the starting date of the policy term (day)
response = JOptionPane.showInputDialog("Please enter the starting date for the policy term (day)");
startday = Integer.parseInt(response);
//Prompts the user for the ending date of the policy term (year)
response = JOptionPane.showInputDialog("Please enter the ending date for the policy term (year)");
endyear = Integer.parseInt(response);
//Prompts the user for the ending date of the policy term (month)
response = JOptionPane.showInputDialog("Please enter the ending date for the policy term (month)");
endmonth = Integer.parseInt(response);
//Prompts the user for the ending date of the policy term (day)
response = JOptionPane.showInputDialog("Please enter the ending date for the policy term (day)");
endday = Integer.parseInt(response);
//Prompts the user for the effective date of the policy cancellation (year)
response = JOptionPane.showInputDialog("Please enter the effective date for the policy cancellation (year)");
canyear = Integer.parseInt(response);
//Prompts the user for the effective date of the policy cancellation (month)
response = JOptionPane.showInputDialog("Please enter the effective date for the policy cancellation (month)");
canmonth = Integer.parseInt(response);
//Prompts the user for the effective date of the policy cancellation (day)
response = JOptionPane.showInputDialog("Please enter the effective date for the policy cancellation (day)");
canday = Integer.parseInt(response);
//if statements that account for mid-year starting dates
if (startmonth==1)
startcancount=0+startday;
if (startmonth==2)
startcancount=31+startday;
if (startmonth==3)
startcancount=59+startday;
if (startmonth==4)
startcancount=90+startday;
if (startmonth==5)
startcancount=120+startday;
if (startmonth==6)
startcancount=151+startday;
if (startmonth==7)
startcancount=181+startday;
if (startmonth==8)
startcancount=212+startday;
if (startmonth==9)
startcancount=243+startday;
if (startmonth==10)
startcancount=274+startday;
if (startmonth==11)
startcancount=304+startday;
if (startmonth==12)
startcancount=335+startday;
//if statements that account for mid-year ending dates
if (canmonth==1)
startcancount=startcancount+canday;
if (canmonth==2)
startcancount=startcancount+31+canday;
if (canmonth==3)
startcancount=startcancount+59+canday;
if (canmonth==4)
startcancount=startcancount+90+canday;
if (canmonth==5)
startcancount=startcancount+120+canday;
if (canmonth==6)
startcancount=startcancount+151+canday;
if (canmonth==7)
startcancount=startcancount+181+canday;
if (canmonth==8)
startcancount=startcancount+212+canday;
if (canmonth==9)
startcancount=startcancount+243+canday;
if (canmonth==10)
startcancount=startcancount+274+canday;
if (canmonth==11)
startcancount=startcancount+304+canday;
if (canmonth==12)
startcancount=startcancount+335+canday;
//if statements that account for mid-year starting dates
if (startmonth==1)
startendcount=0+startday;
if (startmonth==2)
startendcount=31+startday;
if (startmonth==3)
startendcount=59+startday;
if (startmonth==4)
startendcount=90+startday;
if (startmonth==5)
startendcount=120+startday;
if (startmonth==6)
startendcount=151+startday;
if (startmonth==7)
startendcount=181+startday;
if (startmonth==8)
startendcount=212+startday;
if (startmonth==9)
startendcount=243+startday;
if (startmonth==10)
startendcount=274+startday;
if (startmonth==11)
startendcount=304+startday;
if (startmonth==12)
startendcount=335+startday;
//if statements that account for mid-year ending dates
if (endmonth==1)
startendcount=startendcount+endday;
if (endmonth==2)
startendcount=startendcount+31+endday;
if (endmonth==3)
startendcount=startendcount+59+endday;
if (endmonth==4)
startendcount=startendcount+90+endday;
if (endmonth==5)
startendcount=startendcount+120+endday;
if (endmonth==6)
startendcount=startendcount+151+endday;
if (endmonth==7)
startendcount=startendcount+181+endday;
if (endmonth==8)
startendcount=startendcount+212+endday;
if (endmonth==9)
startendcount=startendcount+243+endday;
if (endmonth==10)
startendcount=startendcount+274+endday;
if (endmonth==11)
startendcount=startendcount+304+endday;
if (endmonth==12)
startendcount=startendcount+335+endday;
//for loop that counts the days between the beginning and end of the policy
for (int startcount = startyear; startcount < canyear; startcount++){
startcancount = startcancount + 365;
if (((startcount%4==0) & (startcount%100!=0)) | ((startcount%400==1) & (startcount%100==0))){
startcancount = startcancount + 1;
for (int startcount = startyear; startcount < endyear; startcount++){
startendcount = startendcount + 365;
if (((startcount%4==0) & (startcount%100!=0)) | ((startcount%400==1) & (startcount%100==0))){
startendcount = startendcount + 1;
//[Start String Month] Assigns the number for starting month entered to its corresponding month (starting date)
if (startmonth == 1)
ssmonth = "January";
if (startmonth == 2)
ssmonth = "February";
if (startmonth == 3)
ssmonth = "March";
if (startmonth == 4)
ssmonth = "April";
if (startmonth == 5)
ssmonth = "May";
if (startmonth == 6)
ssmonth = "June";
if (startmonth == 7)
ssmonth = "July";
if (startmonth == 8)
ssmonth = "August";
if (startmonth == 9)
ssmonth = "September";
if (startmonth == 10)
ssmonth = "October";
if (startmonth == 11)
ssmonth = "November";
if (startmonth == 12)
ssmonth = "December";
//[cancellation string month]Assigns the number for ending month entered to its corresponding
//month (cancellation effective date)
if (canmonth == 1)
csmonth = "January";
if (canmonth == 2)
csmonth = "February";
if (canmonth == 3)
csmonth = "March";
if (canmonth == 4)
csmonth = "April";
if (canmonth == 5)
csmonth = "May";
if (canmonth == 6)
csmonth = "June";
if (canmonth == 7)
csmonth = "July";
if (canmonth == 8)
csmonth = "August";
if (canmonth == 9)
csmonth = "September";
if (canmonth == 10)
csmonth = "October";
if (canmonth == 11)
csmonth = "November";
if (canmonth == 12)
csmonth = "December";
//Assigns the number for ending month entered to its corresponding month (ending date)
if (endmonth == 1)
esmonth = "January";
if (endmonth == 2)
esmonth = "February";
if (endmonth == 3)
esmonth = "March";
if (endmonth == 4)
esmonth = "April";
if (endmonth == 5)
esmonth = "May";
if (startmonth == 6)
ssmonth = "June";
if (endmonth == 7)
esmonth = "July";
if (endmonth == 8)
esmonth = "August";
if (endmonth == 9)
esmonth = "September";
if (endmonth == 10)
esmonth = "October";
if (endmonth == 11)
esmonth = "November";
if (endmonth == 12)
esmonth = "December";
double refund = (startcancount/startendcount)*premium;
//The final output consisting of the users first name, middle name, and last name.
JOptionPane.showMessageDialog(null, "Name: " + firstname + " " + middlename + " " + lastname + "\n" +
"Premium: $" + premium + "\n" + "Date: " + ssmonth + " " + startday + ", " + startyear + "\n" +
"End Date: " + esmonth + " " + endday + ", " + endyear + "\n" + "Effective Date: " + csmonth +
" " + canday + ", " + canyear + "\n" + "Refund: " + refund);
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