Synchronization FPGA or Subvi clock

Similar Questions

• FPGA and external clock Source

  By using a PXI-7854R, is it possible to run a process on an external clock source? As far as I know, you could potentially bringing the external clock to one of the triggering RTSI lines. Is this correct? Is it possible to route through one of the connectors on the PXI-7854R? If this isn't the case, I also have a PXI-6229. Can the external clock be routed to the RTSI through the PXI-6229 and then line for the PXI-7854R to run the process?

  Hello

  Unfortunately not, as noted hereand here. The best solution is just the external clock with DIO on a structure of case to door. While this will not have any type of phase synchronization and you may miss the clock cycles depending on how long and how fast your external clock is running (not really an option). I hope that answers your question.

• LabVIEW FPGA: Integration node clock wrong

  Hello

  I'm having some difficulties to understand how the clock is part of the node IP for LabVIEW FPGA and was hoping to get some advice.

  What I try to do is to set up a digital logic circuit with a MUX feeding a parallel 8-bit shift register. I created the schema for this Xilinx ISE 12.4, put in place and can't seem to import the HDL code into an intellectual property node. When I run the VI, I am able to choose between the two entries for the MUX, load the output in the shift register, clearly the shift register and activate the CE.

  My problem is that when I switch to the entrance of THIS, he should start 1 sec shift (Boolean true, SCR, High, what-have-you) in the registry once each clock period. Unfortunately, it instantly makes all 8 bits 1 s. I suspect it's a question of clock and here are some of the things I've tried:

  -Specify the input clock while going through the process of configuring IP nodes.

  -Adding an FPGA clock Constant as the timed loop.

  -Remove the timed loop and just specifying the clock input (I'm not able to run the VI that I get an error that calls for a timed loop)

  -Do not specify the clock to enter the Configuration of the IP node and wiring of the FPGA clock Constant to the clock input (I can't because the entry is generated as a Boolean).

  -Remove an earlier version of the EC who had two entries up to a door and at ISE.

  -Specify the CE in the process Configuration of the IP nodes.

  -Not specify this in the process of setting up nodes IP and wiring it sperately.

  -Various reconfigurations of the same thing that I don't remember.

  I think I'm doing something wrong with the clock, and that's the problem I have. Previously, when I asked questions to the Board of Directors on the importation of ISE code in LabVIEW FPGA, a clock signal is not necessary and they advised me to just use a timed loop. Now, I need to use it but am unable to find an explanation online, as it is a node of intellectual property.

  Any advice would be greatly appreciated, I'm working on a project that will require an understanding how to operate clocks the crux of intellectual property.

  Thanks in advance,

  Yusif Nurizade

  P.S. I have attached my schematic ISE and the LabVIEW project with one of the incarnations of the VI. The site allow me to add as an attachment .vhd file, but if it would help I could just paste the body of the code VDHL so just let me know.

  Hello Françoise,.

  I spoke to the engineer OR this topic and it seems that it was sufficient to verify that your code works, by putting a wait function of 500 ms on the while loop to check that the registers responsible and clear. I'm glad that it worked very well!

• Problems of synchronization of the sample clock with a frequency of a PXI-6229 counter!

  Hi all, I'm having some problems with the synchronization of a frequency meter connected to a liquid flow meter (sensor only have 1 open collector output) with the sample of a PXI-6229 map clock. Someone there willing to give me a little help here would be appreciated?

  The problem is that the reading of the meter in the whole loop blocks until the time-out period.

  

  Suggestions for an alternative approach would be too good...

  Source code attached.

  BR,

  / Roger

  It sorted another way!

  

• PXI FPGA NI7831R Subvi nirviExtendedMemory.vi LV2011

  With LabVIEW 7.1 projects, I had been using a Subvi memory, called nirviExtendedMemory.vi - it works like a memory "non-volatile". The Subvi is called by a 16x128block.vi. The subvis work together with LabVIEW 2011 on the host, but it breaks a LabVIEW FPGA 2011 because project as the "sub - VI 16x128block Subvi is not executable.

  I'm new to LabVIEW 2011 - may it be resolved in the project FPGA configuration?

  Thank you

  John

  Hi John,.

  Can you give a little more information about the feature you are trying to reach?  Would it not possible to post these Subvi?

  Perhaps what you are looking for is the memory block.  Try right-clicking on your FPGA target and selecting new > memory.  Take a look at the "Memory check" section of this article.

  Best,

• synchronize the computer's clock, failure

  My computer clock will not synchronize what can I do?

  It has been my experience that if too far, the clock is not synchronized that the automatic update will often fail. Manually set the clock, then automatic update again. It should work this time.

• Keep the impulses generated in synchronization with an external clock

  I use a card PCI-6602 with Windows 7 and the ANSI C library.

  I need a continuous 100 HZ output to stay in sync with an external 1 HZ clock.

  I started with the example in the http://www.ni.com/example/27415/en/

  If I send impulses 99 I can retrigger every second without problem

  If I send 100 pulses on the next retrigger is missed and impulses come out of all the other seconds.

  I have here a way around this?

      TaskHandle  taskHandle = 0;
  
      char *      chan           = ' Dev1/ctr0. "
  
      float64     duty           = 0.5;
  
      float64     freq           = 100;
  
      uInt32      slow           = DAQmx_Val_Low;
  
      float64     initDelay      = 0.0;
  
      uInt32      edge           = DAQmx_Val_Rising;
  
      char        * triggerSource = ' / PFI19/Dev1;
  
      uInt32      numSamples     = 100;
  
  DAQmxCreateTask("",&taskHandle);
  
      DAQmxCreateCOPulseChanFreq(taskHandle,chan,"",DAQmx_Val_Hz,idle,initDelay,freq,duty);
  
      DAQmxCfgDigEdgeStartTrig (taskHandle, triggerSource, edge);
  
      DAQmxCfgImplicitTiming (taskHandle, DAQmx_Val_FiniteSamps, numSamples);
  
      DAQmxSetStartTrigRetriggerable (taskHandle, 1);
  
      DAQmxStartTask (taskHandle);

  To some of the devil, because your timing is a so much is little too limited:

  -How is crucial to generate exactly 100 Hz?  What happens if you have generated to, say, 100,01 Hz?  This cheat of tiny bit timing could give the Council sufficient time to rearm and retrigger every 1 second.

  -How certain are you that the external signal is a rock solid 1,000000 Hz?   If it can vary quite a bit from your Council, you will not be able to know in advance what time window, you need to meet your 100 pulses in

  -assuming that the external signal is a perfect 1,000000 Hz and that you need to generate to (what your Board of Directors believes) a perfect 100,0000 Hz, can you live with generation of 99 impulses instead of 100?

  -How do you intend to treat lightly divergence that is almost certain to exist between the idea of external signal of 1.00000 dry and the idea of your Board of Directors of 1.00000 oscillator dry?   I remember well, the 6602 is valued at something like 50 parts per million accuracy of calendar, give or take a little variability of temperature based

  Otherwise, no specific magic answers.  If really stuck, I have an idea, or to do something with several counters are working together, but have not thought enough details have confidence in the feasibility.

  -Kevin P

• shared Subvi FPGA, variable functions

  Hello

  I want to create a new FPGA project, there will be main.vi and subVIs. The point is, subVIs include loops and waiting for a button click on by user (step controller RT) to perform their task... I tried to use global variables, but I think that it s not working do not... Because the button not Exchange carried out by subVIs... I realized when I changed a few global Boolean variables on subVIs FPGA, I couldn't have the same effect on the front of controller RT...

  What should recommend me to use shared variables, can be controlled through, subVIs RT controller, screw FPGA, FPGA...

  Best regards...

  Do I understand correctly that you ary tries to use a global variable to Exchange data between RT and FPGA? It will not work. Global variables don't work within the scope of an application, the host, RT or FPGA, but not between them. To Exchange data between RT and FPGA, you need to use ' Read/write control' in the FPGA palette or use DMA.

  You can use global variables to share data between the main VI FPGA and SubVIs or just different loops on the FPGA.

• The BIOS clock does not work after upgrade to Windows 7

  XW4300 workstation has been recently updated to Windows 7 from XP pro.  After the update, the system clock did not keep accurate time, then I entered the BIOS Setup and set the time here.  After several hours, I rebooted, entered the BIOS configuration and noticed clock BIOS had not changed.  I replaced the CMOS (CR2032) battery with three different batteries and BIOS clock does not always change.

  Occasionally, Windows 7 system clock will synchronize to the BIOS clock, which creates the incorrect time in Windows. I can see these events in the system event log.

  Is it possible that this problem is related to the Win 7 upgrade, or is it a problem without a report?  Suggestions to control or fix the BIOS clock beyond what has been done so far?  If I can't fix the BIOS clock, is it possible to prevent the synchronization of the clock in the BIOS Win 7?

  ERICO wrote:
  

  Replace the jumper CLRCMOS or CLRRTC to its original position after erasing the CMOS memory and flashed the BIOS? If you do not then the time will be reset whenever you turn off the PC.

  I have not found a CLRRTC jumper on the 4300.  Is there a jumper to reset the password (E49), and a CMOS reset button.

  However, I tried to reinstall the battery with power supply cable disconnected, and it reset the CMOS all anyway.  Reset the CMOS seems to have solved the problem.  BIOS clock has now begun to follow the exact time again.  I rebooted several times now, and the time is now correctly.

  Thank you all for your suggestions.

• Synchronization of data from different sample of data acquisition rate

  I use a high RT 8135.  I'm sampling of signals from analog pressure thermocouples to 20 ms and 10 ms.  I use the stream network to transfer the data from the SMU on my host.  I would like to be able to synchronize the timestamps of all data to the 1ms sampling note and record in a file.

  Search in the file my sampling data 10ms end timestamp does not match the timestamp of 20ms, missing data... I know you have empty queues to get the rest data but is possible to interpolate any data to adapt a unique timestamp?

  Thank you!

  Hi aokada09,

  Looks like you are facing problems resulting from parallel execution two loops you have.  There is nothing necessarily bind the two loops together, so that each of them an iteration at the rates you specified, but are allowed to start each software (sort of random) dictates that they start.

  To get a solid synchronization, share a sample between the two measures clock, but run the sample clock at 100 Hz for 50 Hz for thermocouple measurement and pressure measurement.  You should be able to use shared inside the SMU chassis backplane clock.  This will be as close as possible to synchronize without using a card of timing.  The only real source of delay/tilt between readings at this point is the physical distance that must travel the clock signal. This will not lead to steep, but there will certainly be some (probably on the scale of the high-nanoseconds or microseconds bass).  This article gives more information about the synchronization and the sample clock:

  http://www.NI.com/white-paper/11369/en/

• Synchronization of the AI channels on the map of PCIe6351?

  Hello world

  I have a small question; If all goes well a easy answer...

  I receive multiple signals of AI of the map above... When these signals sampling of I, it is necessary to include a "trigger" in the DAQmx code necessary for data synchronization, or puts the clock source sample on sufficient the "PCIe6351/AI/sample" clock?

  Thank you

  Jack

  The on-board clock is part of the data acquisition board. The on-board clock is the master clock.

  The help of LabVIEW has many details (like DAQmx help) on different clocks. For LabVIEW, go to content > taking action > NI - DAQmx Key Concepts > triggering and synchronization.

• Example of clock routing 'Terminal of Destination' = 'BoardClk? '

  Several clock routing examples have a Terminal of Destination of "BoardClk". I can't find any documentation on what this is or where he's going. I've attached an example, "Route Clock.vi", which can also be found in example Finder > material input and output > timing and synchronization > Signal-based > road Clock.vi.

  Specific material, with what I experience is the SMU-6674 t. I looked in the manuals for the SMU-6674 t and the SMU-1082 chassis. Google has no results.

  Hello

  Examples of NO-Sync include a number of modules. As a result, some of the terminals listed in the examples are not available on the SMU-6674 t.

  BoardClk is only a valid terminal on the PXI-668 x modules. This terminal is used internally by the multi-device PXI_Clk10 software disciplining. With the PXI-6683 (H), this terminal can be used for single-device PXI_Clk10 discipline as well.

  Kind regards
  -Tyler

• clock guard no precise time despite it 3 times today changes?

  Why does my clock keeps time really slow. Windowsw vista 3 hours lag at 7:00 tonight. clock registers 04:10... changed the time three times today.
  All set up for internet synchronization |! |
  and two clocks on international... help please.

  Why does my clock keeps time really slow. Windowsw vista 3 hours lag at 7:00 tonight. clock registers 04:10... changed the time three times today.
  All set up for internet synchronization |! |
  and two clocks on international... help please.

  It is possible that either timt to replace the CMOS battery.

  How to replace the CMOS battery
  http://www.computerhope.com/issues/ch000239.htm

  CMOS battery
  http://murfsgarage.cybertechhelp.com/CMOS.htm

  ATTENTION: while the battery itself is very good cheap, be careful if you decide to replace yourself.
  It is better to have another friend who knows also computer be with you together.

  The safest way is to pay the Department store. But it will cost you.
  Your call.

• How .vi DAQmx Read (analog 2D NChan DBL NSamp) to acquire continuous data?

  I try to get the .vi DAQmx Read (analog 2D NChan DBL NSamp) to acquire data continuously.  The 'help' indicates I need to wire the number of samples per channel-1, but it doesn't seem to work for my application.  If I have the wiring to any number greater than 0, the data collection works, but is not continuous.  I enclose the code (Sept15_MainPanel_WorkingBaselines_ApplyBaselines and Calibration.vi) and a Subvi (Collect_Baselines.vi) if someone wants to take a look.

  Here's what I'm trying to do:

  I use a unit NI USB-6009 to collect analog voltages of load cells 2 (channel 0 and channel 1) and 2 displacement transducers (channel 2 and 3).  The main panel of the VI contains a listbox with 4 options - 'Check EMG channel', "Collect base lines," "Collect Data" and "end of program".  'Collect base lines' 'End of program' work and I'm working on writing code to "Collect data".

  For the option "Basic collection", 2500 samples are read from 4 channels described above and 2500 samples are averaged.  This works.

  The option "Data collection" - I would like to that data from 4 channels to acquire permanently.  Finally, for the option of data collection, data acquisition stops when channel 0 detects the force of 200 N - so I will not always have a finite number of samples read.  The time it takes to reach the value of this force will be different for each test.

  -How can I get continuous samples for my 4 channel?  Is .vi DAQmx Read (analog 2D NChan DBL NSamp) function badly and if yes, what should I use?

  Thanks in advance for any ideas or advice.

  Esther

  First, in case 1, you need not the structure of flat sequence.  The son of the error and data properly will dictate the flow of execution.  Then, in State 2, you must initialize the shift register, unless you want to keep the data is accumulated each time that you run the vi.  The reason why you don't see all the data here is because you have - 1 wired for the number of samples per input channel.  You must connect a number here, even if you are taking continuous samples.  The service needs to know how much sample to gather at one time.  If you put-1 here, the number of samples per channel must be set up in the synchronization function DAQmx (sample clock).  If you specify a number here, then you put-1 in playback function.  The DAQ hardware will read continuously, you must retrieve the data from time to time, so you must specify the number of samples.  By reading inside a loop, it will continue to read until the stop function is encountered.  I guess that the Clear function acts as a stop.  But you must always indicate playback vi how many samples to read and return on each iteration of the loop.

  The documentation is a little misleading.  He warns that a - 1 will cause a continuous reading.  But the pads are so big, he can not read continuously forever without losing data.  If you specify a finite number, playback in a loop, and he will read this number and return the data (empty the internal buffer) at each iteration of the loop.  Continuous means that you just call the start function once.  He will read at each iteration of the loop until the stop function (or clear) is called.

  Here is the difference between the setting of the Timing DAQmx function for continuous or finished reading: finite samples requires a tenure, he reads the finite number of samples, and it's done.  It requires another start to read more data.  Continues to read requires only a start.  It still reads a finite number of samples, but when this is done, you can retrieve the data by calling the read function until he could continue.  After the reading, you don't have to call for new start.  Look at it this way.  Start is what starts the collection of data, not the read function.  Just read empty buffers in your data feed.  The data acquisition continues in continuous mode, but you must call read again to get the data on the pads.  If you specify basically buffer size when you set the number of samples per channel.

• System of TimeShifting and not automatic sync

  Hello together,

  as I updated my MBP late 2008 for OS X 10.11 sometimes my system date and spend several days and hours. The time is not corrected by the time of synchronization automatically until I have shut down and restart the synchronization time in the options of the system. Anyone of you have similar problems and may have a solution for this?

  I've read that for OS X 10.9 and 10.10 time synchronization is triggered by pacemaker instead of ntpd itself. When I try to configure Stimulator on OS X 10.11 I recognized he is absent today. As someone at - it an idea how synchronization time is triggered in 10.11 and where can I find more information about it?

  Thanks in advance for your suggestions.

  You are running another operating system on a virtual machine under VirtualBox, VMware or Parallels? If so, there may be a setting to disable the synchronization of the system clock of the guest OS. I can't be more specific. Select this setting and see if there is an improvement.