Strange thermocouple at the time reads high

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• Control the time times of high and low of trains of pulses in C++

  Dear team of support of National Instruments,

  Here's what I have so far:

  I was able to generate the number of pulses (a pulse = a rising edge and front descending one) that the user has indicated via the GUI I created in Visual C++ 2008.

  I use DAQmx 8.6.

  I use the DigitalSingleChanWriter (hopefully, that's what it's called).

  I use for the synchronization of the sample, on request.  I tried to use all other types of calendar but I always get a DAQException run the error that says I can use only OnDemand calendar.

  OK, so here's the problem:

  I have a USB-6008-6009 card connected to an oscilloscope.  I know that the connection is correct, otherwise nothing would appear.  However, if I send say... 6 impulses, the delay between the first rising edge and the first falling edge is dramatically different and then the second and the third.  If I return my samples, I get an assortment of new and totally random times.  So finally, my question is "Is there a way to control the time of a great time and a bit of time?"

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  I hope that I don't have drug it too long, but I decided that distribute information on would be better then just a few tid bits.

  Thank you for support, that you can offer,

  Daniel

  OK, so I just returned from the lab, and this is what I got:

  I was able to control the time at the time of the high and low by using the "WriteSingleSamplePort" of the DigitalSingleChanWriter method.

  I put it in a loop that repeated many times that the user wanted impulses.

  At the beginning of the loop, I used a delay function that I wrote and delayed for a time given and then a pulse with a value of 255 and then delayed again and a pulse with a value of 0. And then restarted the loop.

  In the end, it works.

  Of course, I have another question.  I kept reducing the amount of time between two pulses (1 s, .5s, .2us and so on).  However, once I have diminished the time of secondes.01 or a millisecond, the pulses on the arrested oscilliscope becomes smaller.  It seems that past 1 millisecond Board USB-6008/6009 is unable to deal with the exigencies of the moment.  Or else the computer trash part on that I cannot deal with the exigencies of the moment.  But I believe that the Council is not at fault because it was designed for this exact sort of thing, could you tell me if there is no limitation to the Commission which prevent production of pulses in or within a period of 1 millisecond.  Thank you very much.

  Thanks for all the help,

  Daniel

  P.S. I'll stop you buggin with big messages that I promise you.

  P.P.S.  If someone wants to see my source code for their own project, I'd be more than willing to share.  Please email me or leave a message here.

• Date and time on the graph (read from Excel)

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• Counter: Why is 'Task is' returns True after the time of the HIGH?

  Realized that my other thread has been put out on the rails by... myself.

  Started testing the "task performed is" function on a counterexample over;

  Why is it returns "True" after time and not up AND down?

  And more still-so, how can I get him back 'True' after the time of low AND high? How can I get it to tell me that it's "done" after 9.1seconds instead of the ~ 3 seconds like today. Is there a better setup that I can use? (the numbers are arbitrary)

  

  

  A couple of notes, assuming that we have to deal with default impulses that are active top with a low idle state.

  1. in general, a pulse is defined with a 'time in idle state', first followed by a time in the status of the pulse.  Therefore, by definition a pulse (and so also a task of pulse) is indeed at the end of its active state (high).

  2. HOWEVER, the impulse first in no pulse train DO NOT USE 'small time' entry to set his time in idle state before the pulse.  Instead, it uses the "Initial deadline" entry for the first pulse while 'Low Time' is used for all subsequent impulses.

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  This type of agreement has always seemed awkward at best to me.  I think that aid should be a lot more important emphasis on the idea that 'Small time' gets ignored for pulse unique.  I mean, the info * is * there but it's pretty easy to miss before you know to look for.  In any case, hope this helps you in your application.

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  You can disable this in the Edit menu-> preferences-> General

  

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• Satellite L500-1XL - high CPU usage all the time

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• FIFO DMA read high CPU usage

  Hi al, it's a long!

  I noticed a strange behaviour when I read from a FIFO DMA between FPGA and RT host on my crio (9014 controller and 9104 bottom of basket). The FPGA is writing data to the FIFO 2 points every millisecond and the loop of the RT is the reading of 500 data points each loop of the MS 250 CR period is controlled using the hold until the next ms multiple function.

  Wait until the next use means ms that during the first round, the wait will be not so I gave the FIFO DMA read method a timeout of 750ms to allow data points to accumulate on this first iteration.

  I then ran the VI and it read the data as planned and it was always 0 in the FIFO. Then using the system monitor, I noticed the CPU usage on the RIO and was surprised to see that it was 30% !

  After a lot of puzzle and many other attempts as to set the timeout to zero if delays fair read until here, I've decided are enough data points and then executes a little behind so that there is always a constant number (non-zero) of data points in the FIFO. Now, the VI runs and only use about 3% CPU.

  I thought that in the first case as I read exactly the number of points in the FIFO that I was tripping some kind of voting behavior in the playback feature which has been hogging the cpu.

  So I ran a business with a zero time-out, where I was reading with 0 points of data to the left in the FIFO as in the first case and waited to see if the delay of read but it never does and the CPU usage is normal.

  So what's happening? I'm puzzled!

  Thank you

  Steve.

  Hi Steve,.

  I think I can explain the use processor behavior that you are experiencing:

  Case 1: Loop with nonzero time-out

  -Your code starts with wait a multiple ms: This means that a 0-250 ms timeout occurs (on average 125 ms)

  -Then your code tries to read 500 data points in the DMA FIFO (if 500 points come in every 250 ms). All data cannot be presented yet.

  -If 500 points are not yet ready, polling occurs until they are. During the time of the poll, the CPU usage is high. Finally, the data is read.

  -The next iteration of the loop begins.

  -The code is now expected up to 250 ms after the last function call until the next ms Multiple. Roughly the same amount of data should be available by the end of this expectation as in the last iteration. Therefore, the question about the next FIFO DMA read should be roughly the same, and the CPU usage will remain high.

  Case 2: Loop with zero time-out

  -In your code, immediately after the first call to wait until the next multiple ms, you "synchronize" by reading all the remaining data from the FIFO.

  -In the next iteration of the loop, we can expect the call until the next ms Multiple wait the entire 250 m means that the data DMA FIFO (discount jitter) should be ready. If jitter is low enough, this will result in delays very little of the read DMA FIFO and a low CPU usage.

  I would recommend either using a timed loop and read the exact number of data points available (if your application can handle variable size data sets), or using a while loop as you are and make sure that the loop priorities are defined such that the CPU usage high does not affect critical functionality.

  Thank you for the very good question; I personally really like thinking through these issues! Please let me know if you have any questions that deserve further discussion and have a nice day!

  Kind regards

  Casey Weltzin

  Product Manager, LabVIEW Real-time

  National Instruments

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  After a few experiences, I discovered how to fix this problem.  I don't know if this method is 'safe', but it works for me and until there has been no data loss/hard disk problem.  This fix works for Windows 7 and Windows 8.  Here are the steps to take to solve the problem:
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