Counter/Timer internal 80MHz using VC++ / DAQmx

Hello,
I would like to measure pulse width, using the internal timebase of a 6602 device with the DAQmx library availble in VC++.
So far, I managed to use the external PFI lines (using DAQmxSetCICtrTimebaseSrc function), but I need more precision and the internal 80MHz will be just fine.
--> How do I configure the counter to use the internal clock ?

You've posted this question to the wrong forum. This is for genreal feedback on the forums use and design. Try the Multifunction DAQ forum.

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Simultaneously run two counters with the internal 80MHz timing

Hi, I have a programming problem about the NI PCI-6602 counter card. I want to use the internal timing signal (80MHz) as the source signal and feed two external signals to the two counters. The operation mode is the Buffered Period Measurement.
I can succeed in one counter programming by using these old DAQ functions calls in sequences:
    iStatus = GPCTR_Control(iDevice, ulGpctrNum, ND_RESET);
    iStatus = GPCTR_Set_Application(iDevice, ulGpctrNum, ND_BUFFERED_PERIOD_MSR);
    iStatus = GPCTR_Change_Parameter(iDevice, ulGpctrNum, ND_SOURCE, ND_INTERNAL_MAX_TIMEBASE);
    iStatus = GPCTR_Change_Parameter(iDevice, ulGpctrNum, ND_GATE, ND_PFI_38);
    iStatus = GPCTR_Change_Parameter(iDevice, ulGpctrNum, ND_INITIAL_COUNT, ulInitCount);
    iStatus = GPCTR_Change_Parameter(iDevice, ulGpctrNum, ND_BUFFER_MODE, ND_CONTINUOUS);
    iStatus = GPCTR_Config_Buffer(iDevice, ulGpctrNum, 0, ulCount, pulBuffer);
    iStatus = GPCTR_Control(iDevice, ulGpctrNum, ND_PROGRAM);
    while(RunStatus)
       iStatus = GPCTR_Read_Buffer (iDevice, ulGpctrNum, readMode, readOffSet, NumPtToRead, timeOut, &NumPtRead, buffer);
       m_Chart1.DoPlot(); // Plot the data
iStatus = GPCTR_Control(iDevice, ulGpctrNum, ND_RESET);
But when using two counters, I tried to open two individual counter tasks by just doubling the codes above (each counter has independent DMA buffer). The program hanged forever. After debugging, the codes stop after it comes to read the 2nd DMA buffer (the 2nd line below).
iStatus = GPCTR_Read_Buffer (iDevice, ulGpctrNum0, readMode, readOffSet, NumPtToRead, timeOut, &NumPtRead0, buffer0);
  iStatus = GPCTR_Read_Buffer (iDevice, ulGpctrNum1, readMode, readOffSet, NumPtToRead, timeOut, &NumPtRead1, buffer1);
I also tried to check the labview codes that I have for the implementation of 2 counter measurement. There are two sets of function calls for each counter, "Counter Group Configure" -->"Source Slection" --> "Gate Selection" --> "Buffer Configure", in the same sequence structure, and two "Buffer Read" calls in a later, but also the same, sequence structure. My C programming is done just by following the labview codes above. But the labview program doesn't crash like the C program. Besides, one more question that I found is that I cannot find the fundtion "Counter_Group_ConfigInterface" inside the C function library. I tried to use the function "CTR_Simul_Op" but failed.
So, my problem is that what's the problem about my C codes and how can I do the two counter measurement by the same internal timing base. Sorry to put all the problem in such a mess. If you need more information about my codes or my experimental requirement, please let me know. Thank you for your help!
Sincerely,
Jung-Cheng

Hi Pavani,
Welcome to the forums! As a new LabVIEW user there are many helpful resources out there to get you started. I would like to point you to the two links in my signature. The first is a six hour LabVIEW course and the second helps you learn DAQmx. Also take advantage of the shipping examples. When you open LabVIEW select Find Examples to open the Example Finder. Assuming you are using DAQmx, you can go to Hardware Input and Output>>DAQmx>>Counter Measurements and find many useful example programs that either do what you want or can be modified to perform the task you desire.
To answer you question, two counters in the same loop do not affect each other. The counters will gather data separately. By putting them in the same loop, you just perform the reads in software at the same time.
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Frequency divide by N doesn't work on Counter-Timer PCI-6602

Hello everybody,
I tried to do something basic ( ?) with this Counter-Timer 6602 Board, and it doesn’t work.
So I hope some people with more experience than me could understand what happens here.
1) What I need:
I need to generate 4 synchonised clocks, whose periods will be multiple of 1 ms.
2) What I have:
LabVIEW 7.0 and a PCI-6602 Counter-Timer Board in a DELL PC running under XP pro.
The PCI-6602 Counter-Timer Board has 8 counter timers named CTR 0, CTR 1, ... CTR7.
3) What I have already done, and that worked:
- Generate a 1 kHz “Master Clock” signal from CTR 4, configured by “Continuous Pulse Generator Config.vi” (found in “Data Acquisition, Counters...).
- configure CTR 0 and CTR 1 to work as frequency dividers, by use of “Down Counter or Divider Config.vi”.
- Apply the output signal of CTR 4 (OUT ) to the SOURCE inputs of CTR 0 and CTR 1 by means of physical wiring in the SCB-68 connection box.
When I do this, I get two nice secondary clock signals on my oscilloscope screen, ( with periods = 3 ms, or 5 ms or whatever multiples of 1 ms I choose) from CTR 0 and CTR 1 outputs , very clean and perfectly in phase with the 1 kHz Master Clock.
So far, so good...
But I still need 2 more secondary clocks...
One would say: “No problem, do the same trick with two other counters...” Well, not so simple, it seems...
4) What I tried to do, and that didn’t work:
When I try to do the same frequency division with any of the remaining counters, (CTR2 to CTR7), the program stops and I get an error “ –10020 : Time base not valid “.
I can’t figure out what happens here: I thought any counter could be configured to work as a frequency divider, but it seems not to be so, and I am stuck here.
Has anyone an idea about how to fix this type of problem?
Attached file: hor_div02New.vi
Attachments:
hor_div02New.vi ‏123 KB

karolik,
I'm just adding a followup in English. As Marc L. mentioned, the particular vi named "Down Counter or Divider Config" isn't compatible with the 6602. While the 6602 does have the ability to generate 4 synchronized clocks, a different syntax is needed. Here's how I'd do it:
Traditional NI-DAQ
1. Configure a continuous pulsetrain on CTR 4. Route its output to, say, RTSI 4. Don't start it yet.
2. Configure CTR 0,1,2,3 for continuous pulsetrains using RTSI 4 as their "timebase source." Start them.
3. Start the CTR 4 pulsetrain.
4. Now CTR's 0-3 should generate separate clocks with synchronized phasing.
DAQmx
1. Configure a continuous pulsetrain on CTR 4. Don't start it yet.
2. Configure CTR 0,1,2,3 for continuous pulsetrains using "Ticks" for units. Use a DAQmx property node (probably Channel property node, but am not 100% sure and don't have a LV PC handy to check) to specify that the "ctr4 internal output" should be used as the timebase. Start them.
3. Start the CTR 4 pulsetrain.
4. Now CTR's 0-3 should generate separate clocks with synchronized phasing.
-Kevin P.

Change pulse width in a continuous generation using an array of High/Low Times using NI-DAQmx

Hi,
I'm using a PCI 6259 (M-Series) Multifunction DAQ, and I want to use a counter to output a pulse train with changing low times. I want to use this output signal as an update clock, where values of Digital Output Channel, and the Analog Output channels updates to new values sequentially in the order specified in their repective 1D arrays in the front panel. I want the updates to happen at every rising edge of the clock pulse. The times when I want this update to happen are also user-specified by an 1D array of times in the front panel. So I'm trying to configure one couter to output this changing width pulse train.
I'm new to Labview/Ni DAQ. I'm using NI DAQmx, so far its been really nice and readable, and easy to understand. Even though I have never used NI-DAQ, I can clearly see that NI DAQmx is certainly much more programming friendly than NI-DAQ. I looked at the VI's available in the example, and also through many simlar posts in these Forums, and some web documents for my problem. Most of the solutions have focussed on changing times on the fly while the application is running. I want to specify the different times before a "DAQmx Start Task" is called. I'm wondering wether this is possible.
I was hoping I could store the pulse width values in a buffer, and the counter could keep outputing pulses with different widths in one continuous operation. The M-Series help file says that it is possible to do that "seamlessly", but I dont see yet how I can use the NI DAQmx to do that. Attatched is the part of the Help file where it says that.
Any help will be greatly appreciated.
Attachments:
Counter_Change_Frequency_Help.pdf ‏21 KB

Hi Kevin,
Thanks for your message. Well, I would like to point you to the 'DAQmx Timing' vi, which has an instance for change detection applications with digital input. I'm new to LAbview, but I'm wondering wether you can use that for your applications. Yes, I have seen the Viewpoint boards and their programs.. I have actually also looked into their Vi you are talking about, Kevin, for ideas to use with my board, but the core of the program is in C, which is something I would use as a last option, specially since I bought Labview to make life easier.
To get back to the subject of my post, their is a vi 'DAQmx Write", and one of its instance is 'Write Counter Single Channe SINGLE Sample', and there is no 'Multiple Sample" option available for writing counters, as is for the Digital Ports and Analog Outs. That seems to be a bit surprising. To refer the following example
http://zone.ni.com/devzone/conceptd.nsf/webmain/90DFE241E571056C86256FA4004ABB63
(pulse width modulation with NI-DAQmx)
If one can change values of pulse widths on the fly, I would assume thats it should also be possible to pre-define a sequence of pulse width values in a buffer from which the counter 'banks' can access the next pulse width from. ('Banks' are the 2 load register pairs for the counters and is described in the part of the M-series help file attatched in my earlier post).
Hopefully somebody from NI can address our problem. And yes Kevin, currently I have 2 options,... 1. to create a digital waveform before hand, which will use a large buffer ( I want an experiment to run for 1s, with 0.1us timebase, or
2. To use the example in the above web document and modify it a bit. Here frequency is changed on the fly, and a while loop checks if the frequency is changed in the at regular intervals. I could instead use a for loop to keep changing the frequency values, but I tend to think that the speed will be limited by software. I'm not sure .. I haven't tries that out yet.
Hopefully someone can send me a nice elegant solution.
Thanks.
Shomu

How can I Synchronize two counters in CVI using NI-DAQmx

Hi, I am new to NI-DAQmx, and I would like to program counting of random digital pulses using two counters in LabWindowsCVI and a PCI6229 multifunction card. I have the evaluation copy for CVI 7.1
I would like to set counter0, to count pulses from the 10MHz clock, to generate a single pulse (duration in the few ms timescale), that will gate counter1 in the same card.
When I try to route the output from counter0 to the gate of counter1 I get an error code
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DAQmxErrChk (DAQmxCreateCICountEdgesChan(taskHandle,chan,"",edge,initialCount,countDirection));
DAQmxErrChk (DAQmxSetCICountEdgesTerm(taskHandle, "/Dev2/Ctr0", "/Dev2/10MHzRefClock"));
What type of operation are you trying to perform on counter 1? The strategy for routing signals will change based on this. If you're trying to perform gated counting you can specify the the task similarly as above and use the terminal "/DevN/Ctr0InternalOutput" as before. If you are trying to perform frequency measurement you will need to use the DAQmxGetCIFreqTerm function.
Other channel properties are listed conveniently in the NI-DAQmx C Reference Help found at Start>>Programs>>National Instruments>>NI-DAQ on your start menu. A search for "channel properties list" returns this list.
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