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Black Pearl

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Black Pearl last won the day on August 20 2011

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About Black Pearl

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  • Birthday 07/11/1978

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    Freiburg, Germany

LabVIEW Information

  • Version
    LabVIEW 7.1
  • Since
    2002

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  1. I assume the queue might be better in performance. More use cases (SEQ, producer-consumer) -> NI put more manpower behind the optimization code -> better performance. I think 8.5 it was a big marketing about Qs and multicore performance, they never adressed notifiers. But might be completely missleading, as a notifier only needs 1 piece (the current piece) of data while a queue might queue up (as the name suggests), so those optimizations would be unneccesary for a notifier. Felix
  2. No. Dreamed of broken resistors. Didn't replace a schematic. Wish you better dreams. Felix
  3. Just some unqualified basics from my experience. I care about EE safety in germany (little experience from my side and tech not legal dep), so might be different with american steam engines . But statistically touching 230VAC is giving you a chance of about 2% to get killed. For the legal issues, you have 'employers responsibility' for anything that happens (in germany: BGV A1 and BGV A3 for EE). So for me, if someone is killed by bad electrics I produce, my boss (= employer) will hang. If he has no idea about EE, he can delegate this responsibility to me (in written form -> vEFK=responsi
  4. I'm developing a LED based light source (solar simulator) for the photovoltaics industry and research labs. Public information is available in this scientific publication. Felix
  5. I second Daklu. After all, we have an undo operation. Maybe we can just have a checkbox 'do not show this message again'. And make sure there is an ini file entry for this, so we can keep this setting across machines by simply copying the ini file. Felix
  6. I havn't used Ton's API, as I wrote my own (less complete) at the same time. It is useful if you use some automated process (e.g. build scripts). For my reuse packages, I use a pre-build hook in the OpenG builder to extract the log from hg and create a LogFile.txt that is deployed with the package. Also, I have written (but I don't really use them) small vi's that allow you e.g. to rename a vi (save under new name + tell hg that it's renamed) and the like. Didn't had the time to continue on this. But for integration of hg with the LV-IDE, you need the API. Felix
  7. Depending on the complexity of the problem, I also start with pseudo-code. On the more detailed level, I keep an uml model together with the code. For state machines, at least a bubble and arrow diagram (using dia, OpenOffice/MSOffice, or simple a paper) will be my starting point. Both get pasted as pictures on the BD. The most 'primitive' form is a simple comment on the BD as Val pointed out. I think this practice is 'good' and even is encouraged by NI for the exams (I think you get points when just commenting 'this vi will save the data' as much as coding it actually). Those design comment
  8. Offline commits sounds interesting. The main troubles I had with SVN is to manage changes I coded at customers location. At least took me a frustrating half an hour or so. Using mercurial (and above article statesit is pretty similar to git) did resolve these issues in an elegant way. It proved to be robust enough to accept copy&paste behaviour instead of the correct push&pull way to sync between the hard disc of the dev PC and the USB Flash drive. Having to deal with possible IT infrastructure changes, I'm glad to rely on a tool that will be able to adapt to those changes very quick
  9. Difficult to say, if I'd follow AQ, a must have is the hitchhickers guide. On the practical side, I found it difficult to get a book with the reason that I'd like a library on my workspace. The promise to get a new worker addicted to LV gives me a free wish-list on LV-books, and let them do their own selection some more. But actually, there aren't many books on LV, and I don't use any of the other exept the two you mentioned. Look at the projects you like, get some domain information. I've got a cool set of EE books. My bedtime lecture at the moment is (rough translation from german) 'elect
  10. I'd say templates are the way to go with VI scripting. And copy/replace operations. If you need to create things completely by code, you need to write a lot of code. And most of the time 'useless' code just to make the created code look nice (minimizing wire bends). You can take a look at my latest project here. I think about 50% of the scripting-related code is just to get the wires redrawn as they were before. Felix
  11. You need to enable VI Scripting in the options to have methods/properties for this. (LV2009 and later). If you open the BD of a protected VI without a correct pswd, you receive an error. Felix
  12. Thanks, I have a NI CAR for this behaviour. You can select Demo SubVI using Global.vi as Top-Level VI instead. All you miss is to see that it's recursing through SubVIs as well. Felix
  13. Original idea by SteveChandler Now available for beta testing. Developed in 7.1, should run in any newer version. License: BSD, © Felix Schubert Dependencies: OpenG, included with suffix Instructions: Unzip attachement Start Globals2FGV.llb and run it Select Global Variable VI -> Demo/Demo Global.vi Select Top-Level VI -> Demo/Demo VI Using Global.vi Select FGV Target Folder -> Demo Open Demo/Demo SubVI using global.vi and Demo/Demo VI Using Global.vi Press the transform button Take a look at the VIs mentioned above and inside the FGV Target Folder Customization: Change
  14. AQ, thanks for this explanation. More than once (when VI scripting) I stumbeled on the fact, that unrelated objects actually have a common set of properties. Are your considerations already down to the SW level (e.g. about an alternative class ancestry or other means that group these properties together, e.g. seperate objects that will be included in the 'old' obejct)? On the abstract level, structures and SubVIs have a lot of similarities. Most obvious: both own a diagram (sometimes more than one, e.g. Case Structure). This is important, as we now can distinguish between 'inside' and
  15. I had some similar design issues. The solution I came up was a state machine and a queue for communication. The state machine periodically checks the queue (timeout=0ms) if it gets a 'Pause' message. In the pause state, the SM waits (timeout -1) until it receives a 'resume' command. In the state transitions, the tasks are closed/initialized. About semaphores. I think it is easier to use the subVi boundary for this. An action engine always protects data from concurrent access. Concerning uml, it's not really that complicated. Most you can find on wikipedia. Another ressource was M$ Visio, wh
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