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Tim_S last won the day on January 8

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About Tim_S

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  • Birthday 10/17/1974

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LabVIEW Information

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    LabVIEW 2015
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  1. The only time I consistently use Defer Panel Updates is with a TreeView control, which is slow to update the display (particularly when creating hundreds of rows). Another strategy is to check for data change to see if an update is needed. But, really, it depends on what you're doing. A configuration/editing screen is driven by user actions, so one event trips multiple updates to the UI and Defer Panel Updates can be useful. A screen showing periodic data may update each message with no issues, or checks if anything needs to be updated and when it does may need to defer updates to do so quickly. Though if you have something like an informational/debug screen that is only shown when requested then might not update the front panel unless it's visible. Could put that as you've done the cost-benefit analysis and the improvement is not justified.
  2. Looks like all the PYNQ boards are programmable in Python. There was a question on NI Community about this.
  3. Working fine in 2015 (latest I've got installed).
  4. I don't have the vision addon installed, so can't point you to a specific VI. I recall there being an example that performed a histogram of the colors (in RGB?). You may need to open up various vision examples as it might not specifically state it was a histogram example.
  5. I think you're looking for annotations.
  6. Stopped having that issue once went to using win32 calls to make window frontmost and always on top (which has created new issues). Seems like would either hide the window while the file dialog was running or make the VI not modal while the file dialog was called.
  7. Fortran 77 still was taught in at least one college in 1993 on green-and-black and amber-and-black terminals. Was even a mandatory class for freshmen.
  8. I've gotten a test bench of 1 MS/sec of 32-bit data (24-bits plus 8-bits channel identifier) across FPGA->RT->Windows using DMA channel to RT FIFO to TCP and let it run overnight without drop of any data. Buffer was set to maximum size of U32. Now that was with a cRIO rather than a myRIO. Are you using NI's recommendations for best practices? Particularly the one where you check for available (request 0 samples) and then read all is a good way to read on the RT side. If you wait until the buffer is full then the FPGA can (and almost certainly will) overwrite before host side can service an interrupt.
  9. The DMA FIFO is what you're looking for with the data transfer.
  10. That error looks suspiciously like one I was getting when trying to uninstall software after something got messed up on my system (MSI files for uninstall were missing). There is (at least currently) a way around the package manager as listed in the knowledgebase article: https://knowledge.ni.com/KnowledgeArticleDetails?id=kA00Z000000P70TSAS&l=en-US in the section "Software installed originally without NI Package Manager". This brings up the old interface which has the repair option. This was able to fix a bunch of installations which I couldn't uninstall before repairing. There are error logs that NI tech support had me send them which read pretty good for debugging the installer issue: https://knowledge.ni.com/KnowledgeArticleDetails?id=kA00Z000000P6FcSAK&l=en-US
  11. The way I read the OP was first wanting to know if it was possible to create a bar graph (which does seem a strange question as the picture looks like a screenshot of a VI). If it's past that and getting the coordinates, then that's a mouse click event and an invoke node.
  12. There are 3rd party controls that do this. It's also possible in LabVIEW native controls, but it's a bit of work. Been quite a while, but seem to recall fill to zero and a property node to set custom axis labels was involved.
  13. You would need to associate the plot with the second Y axis: https://forums.ni.com/t5/LabVIEW/associating-a-plot-with-a-specific-y-axis-on-a-multiple-y-axis/td-p/63688?profile.language=en
  14. Directions on how to create two Y axes is at: http://www.ni.com/example/25089/en/. Directions on annotations is at: https://knowledge.ni.com/KnowledgeArticleDetails?id=kA00Z0000019QhmSAE&l=en-US
  15. Not familiar with your setup, but was thinking that STOP immediate (NI term) could be a fast stop (drive term). Fast stop, with the hardware I've worked with, is usually a physical digital input on the drive that has to be configured to perform a fast stop through a drive setting.
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