Effective use of the FPGA read/write

Similar Questions

• Frequency of calls to control for the FPGA read/write

  Hello

  I use a cRIO-9076 with a module NI 9476 DO spend some faucets. It is sometimes necessary for faucets with a pulse time down to a few ms of impulse.

  The FPGA VI Gets the power tap queries, executes a logic of security, and routes the numerical results for the exits. It gets applications power of the VI on RT target that uses the function ' Read/write FPGA control' interaction programming of the FPGA VI front. The loop on the RT runs with 1 kHz, no iteration is missed. That means, it should be possible to switch the valves with a resolution of 1 ms.

  What I see on an oscilloscope, is that the output digital are high for multiples of 50 ms, the system does not reach the valve for example 80 ms pulse or pulses shorter than Ms. 50 is a kind of limitation for calls of "FPGA read/write control"? I tried both options for arbitration, but it does not help.

  The best knowledge of the limiting cRIO/module/features or ideas? Thank you in advance.

  Karsten

  Hi Karsten

  You use any time in your FPGA VI?

  It is useful to your code by sending as an attachment so that I can have a look.

  Kind regards

• FPGA read/write does not not in cRIO-9073

  Hello.

  I'm stuck with a problem in the use of the FPGA Read/Write control please suggest a solution.

  I use cRIO 9073 and I'm trying to place an order ON / OFF of GUI-> RT-> FPGA host. I use a shared variable of the network to transmit the control GUI form to host RT and I use read/write control to FPGA. I also put a Boolean flag in the FPGA VI to control if the control is transferred to the FPGA.

  When I toggle the button in the GUI, I see the same change in the host of RT (shown as 16 probe in attachment 1). However the FPGA indicator (indicated as probe 19) remains the default false state. The FPGA VI is on attachment 2.

  Thank you

  Guilhem

  Your FPGA only reads the control once before entering the loop.  If you want to read control permanently, you must put it inside the loop.

• Difficulty using the binary read/write

  Hello

  The binary read/write function somehow not working properly in my application.

  I have one store a 2D strign binary array. When the user closes the application, the application stores the values in table in the Bin file.

  N when the application starts, it reads the file and displays its contents on the table.

  The system works well if the total size of the content is 3 bytes. But if the size of the content is greater than 3 bytes, the program simply returns a NULL value at first when I read the Bin file.

  How to save:

  Convert 2D in String table using "Flatten the string" fn and to save in a binary file.

  Procedure to read:

  read a binary file. convert the output string table 2D using 'string Unflatten ".

  I enclose my code here. PLS, have a look at it and let me know the cause of the problem.

  Ritesh

  I don't understand why you're flattening of a string, a 2D channels table. It's redundant. You seem to be also the substitution of the default big-endian to little endian byte order. You try to save it in a format suitable for other programs on other platforms?

  If this is not the case, all you have to do is:

  

• Cannot access the card reader/writer internal Flash

  After a few updates, I can access is no longer any SD card inserted into the card reader/writer Flash. I tried to use the convenience store but just that said there is no problem found. When I insert the SD card, it appears in the 'control Panel\Hardware and Sound\Devices and printers' as ' Flash Card Reader/Writer "but I am not able to access the card.

  Hi Tim,.

  Was there a card player offered to you via Windows update driver update?

  -You see no drive letter assigned to the flash card while you see for readers in the window 'computer '?

  -What is the error you get when you go to the map?

  I suggest you try to change the drive letter assigned to the card and see if that helps.

  1 type diskmgmt.msc in the RUN prompt or in start search to open the computer management window.

  2. right click on the indicated card device and select "paths of access and change drive letter.

  3. click on change if there is an assigned drive letter, and then change to another letter. If this is not the case, click on add and select a drive letter.

  4 restart the computer so that the changes are applied and see if you are able to access the content in the map.

  For more information: http://windows.microsoft.com/en-in/windows7/change-add-or-remove-a-drive-letter

  Alternatively, you can try to uninstall and reinstall the drivers for the card and see if that makes a difference.

  Visit the website of your computer manufacturer to download and install the latest drivers.

  Let us know the results.

• In the target FPGA read/write control function?

  Hi people,

  I learn a lot from the sample project FPGA, including how you can easily retrieve and set controls and indicators in an FPGA using the read/write control function running in an RT target.

  However, I can't find a way to do something similar in a FPGA target.  I've been down this road before - that is, trying to move the data in/out a looping VI FPGA (void) to a (parent) FPGA VI - where my memory points to reach what I needed use.

  So I was happy to see the palette FPGA enabled me to drop the control functions to read/write on a FPGA vi target.  But alas there where tons of errors (not compatible son for target, etc.) and I guess now it's not possible.

  So, just to be sure, I'm not missing something, is there something like control functions to read/write to use in an FPGA for read/write in an another FPGA (looped)?

  In addition, why would I be able to read/write on a FPGA vi control functions if they are not supported?  (Sorry for the n00b question)

  Thank you

  Steve

  maherhome wrote:

  You're right that I don't have this knot in my palette.  However, I also do not seem to have a Refnum Occurrence in the palette is in the FPGA (see below), but I need to synchronize several loops of FPGA and added research using the textfield in the VI editor (and if compiles and runs).  So 6 months to Labview and I'm fuzzy on how the palette is restricted

  I don't know what you're trying to prove here. There is no control of refnum in search in your image. Occurrences are available in FPGA, and for control of refnum for one you just right click on a function of the instance and create a control. If you can create a valid thread of a certain type of data, then you can create a control or the indicator for it, regardless of the question to know if this type of control or indicator appears in the palettes. However, the functions that you can use in the block diagram are limited by what is available in the palettes.

  maherhome wrote:

  Regarding orders read/write for the FPGA/lights, I'm surprised that the infrastructure developed to allow read/write between RT and FPGA has not mobilized to allow read/write between FPGA and FPGA.  The elements of memory function, but they are less convenient.

  You may have noticed that you cannot compile the individual parts of an FPGA VI and combine them later; This is because when you compile an FPGA VI, all its subVIs are essentially merged to create a single block diagram (with additional logic if one not reentrant Subvi is used in multiple locations, this is why it is not recommended on FPGA). The subVIs no longer exist in the FPGA compiled; reading and writing a control on them would make no sense. If you want similar behavior, use global variables - but understand that global variables store values in FPGA logic resources. Using the elements of memory (or FIFO, which can also store in memory) leaves more fabric available FPGA logic by storing data in resources specially designed for this purpose.

• FPGA read/write eeprom I2C

  Someone at - it an example of LabVIEW for I2C communication to read/write an eeprom?

  I use sbRIO-9636 with FPGA.

  I already tried with the "Advanced I2C" example, but it works...

  Can someone help me?

  Another suggestion:

  You know about the VI package manager? There, you can install an application open source I2C & SPI API (worms. 3.0.0.22). It is an easy way to implement a system of Bus I2C on an FPGA target.

  In this way is a little bit smarter.

  Maybe you like it.

• Make the NTFS read/write permissions without possibility to create/delete folders

  Out to one of our sites, we have a server running Windows Server R2 of 2012 which took a file share accessible to our people on the spot. Our project managers have developed a very strict folder for this file share structure, and for the purposes of verification, they want to stick to the closer this structure as possible.

  Therefore, although the local people must have read/write access to create, edit, and delete files, they won't they are able to create or delete folders. They want to use the existing folders and not to store stuff in folders that nobody knows there is except for the person who created them.

  The closest way to you, I got to do is to uncheck the advanced permissions "create folders / adding data" and "Delete subfolders and files." This has some side effects, however, the most notable being the inability to add data to the files, some files (such as CAD drawings) can be changed by anyone except the person who created them.

  Is there a way using only the NTFS permissions to accomplish what the project leaders? And if not, are there any third-party utilities that will help us do this?

  Thanks in advance for any help.

  Try asking in the Windows Server forum:
  http://social.technet.Microsoft.com/forums/en-us/category/WindowsServer

• The user read/write register access to the network folder/drive. Some users unable to save or write to the directories.

  I have three users who have no problem with read/write & record readers records secure network access. I have two users who can read some files and save in some files, but cannot save or access certain folders even after receiving full access read/write for all files in the network drive. Help, please. The computers running Vista Ultimate and server access to Windows Server 2003. Thanks for your times * address email is removed from the privacy *.

  Problems related to access to the files on a server networked in a business environment are a produce little for Windows answers Forum.  I recommend you repost the question either in the Technet Forum to the:http://social.technet.microsoft.com/Forums/en-us/winserverfiles/threads orhttp://social.technet.microsoft.com/Forums/en-us/itprovistanetworking/threads.

  I don't know that someone there can help you.

  Good luck!

  Lorien - MCSA/MCSE/network + / has + - if this post solves your problem, please click the 'Mark as answer' or 'Useful' button at the top of this message. Marking a post as answer, or relatively useful, you help others find the answer more quickly.

• Need a bit of help with the string read/write DLL

  I have a DLL that communicates via RS232 with some instruments.

  From 2 numbers (parameter number and a number of processes) the DLL will communicate and extract the values.

  I managed to put in place the DLL to get words, characters, long and floats (single precision).

  Now, it is the documentation that accompanies it for strings:

  

  ReadString asks the DLL to get the data of the instrument, if succesfull I have others on call GetString to get the string memory.

  I have a few questions:

  -The values of her star (*) are pointers; As I understand it that it points to a place of memory where the value is stored, is - that correct?

  -How do I know if I pass the value to the DLL, or read? For example with GetString Im not sure if

  I should pass the length of the string to the DLL or if it is read

  -How to get the character returned in a string; IM assuming I need to find somewhere a byte array.

  Now I can also write strings:

  

  As a matter of f:

  -Should I add NULL at the end of the string, or labview does by default?

  My procedure is now: read the input chain, reduce it to the size of the specified string (this is constant according to the setting of the instrument), converted to a byte array and replace the last element of the array with 0 (Null).

  However, the DLL entry expected a character, that I should get in the DLL?

  _Faust wrote:

  I have a few questions:

  -The values of her star (*) are pointers; As I understand it that it points to a place of memory where the value is stored, is - that correct?

  They can be pointers or buffers. Which of the two is ambiguous in the syntax of C. However, in your case I suppose that piMsgId and pcLen be a pointer to a unique value and pszDest a string buffer.

  -How do I know if I pass the value to the DLL, or read? For example with GetString Im not sure if

  I should pass the length of the string to the DLL or if it is read

  Description is not really clear however most of the C API require today the length of the allocated buffer at the entrance to make sure that they don't overrun the buffer length. They may or may not change this value before returning to indicate the amount of data they actually informed. The pcLen parameter passed by reference probably indicates that this function does this way.

  -How to get the character returned in a string; IM assuming I need to find somewhere a byte array.

  It is not necessary. You can simply set the parameter to a string and must be passed as a C string pointer. In LabVIEW 8.5 or more you can also configure to resize this string for the number of characters as indicates it a different setting of the library to compose the node (CLN), in this case your pcLen. 8.5 you can use a table to explicitedly initialization function create a table Bbyte of the length needed, convert the byte array to string and pass to the CLN parameter. LabVIEW will return automatically only the part of the string up to the NULL character if a CLN is configured as C string pointer

  Now I can also write strings:

  As a matter of f:

  -Should I add NULL at the end of the string, or labview does by default?

  No! If you configure the parameter is a string, passed as a string pointer C, LabVIEW will do it automatically for you.

  My procedure is now: read the input chain, reduce it to the size of the specified string (this is constant according to the setting of the instrument), converted to a byte array and replace the last element of the array with 0 (Null).

  However, the DLL entry expected a character, that I should get in the DLL?

• The effects used on the button image image have less effect... ?

  I was curious to know if anyone has come across this problem, or if I was doing something to create this problem.

  I created buttons on a Web site, using a picture frame and importing States. I then wanted to overlay of the effects on the State of the button. I found when I tried to do, they seemed to be nonexistent or minimal, and therefore I their crank up to a level very high, resulting in the first image below Design view.

  

  This shows the levels of effects.

  

  happening in preview mode, this final product.

  

  I'm a bit puzzled as to why the effects are applied to a smaller ratio where they need to be greatly increased to have the desired effect.

  Comment useful for something I can do wrong/if this has happened to you is welcome.

  Thank you

  What do you mean by "using a picture frame and the importing States."?

  You can simply create the text inside the muse, create some padding, fill the box with a color and then apply the effect throuht the section of.

  

• How to set the width of the column read/write rules?

  Hello specialists of the structure.

  I read a set of DITA files in a specific format to the FM model, and there is a detail that I can't work properly. It should be possible to set the width of the columns in a table, even if the DITA file does not include this information. But the developer Application Structure reference does not give information about what string to pass to the property of fm of column widths. Anyone out there experience in doing this?

  Thank you

  Jang

  I have it!

  Turned out to be simple, but the info was more or less hidden in the Dev Guide of Ref: I already had the line "property column widths fm is the value" but did not know the syntax for values. Turns out you need to delimit the values with spaces, not commas. The parser does not give ANY useful information, simply mentions "somewhere near syntax error" or completely ignores the values that you specify.

  This is how the rule for my properties DITA element works now:

  {'Properties' element

  is fm of table element;

  columns FM property value is "3".

  column and the width of the FM property value is "5cm 5cm 6 cm;

  }

  This works. I earn 10 points to answer my own question. :-)

  Ciao

  Jang

• Control of read/write of FPGA Interface

  I need help on control of FPGA read/write Interface. I would like to connect data TCP Read (String) directly to VI FPGA Read, but the entrance is an FXP... How can I do this?

  Then change your FPGA control to be a byte (U8).  On the side of your host, use the array of strings of bytes, then Index Array to get the specific byte you want to write on the FPGA.

• New on Apple computers - Question on the use of the memory (RAM)

  Hello

  I recently bought a rMBP 13 "with 8 GB of RAM. This is only my third time (I started for the first time last night). Here is a screenshot I took of the memory usage after starting it on for the first time. My question is: is it normal to see that most of the memory is in use, even if I only have Safari (1 inactive tablet on the homepage of Google) and open the activity monitor? I'm afraid that this is rare and not have a lot of wrong answers online.

  Second question, if someone has knowledge: 8 GB of RAM is good enough to run software such as MATLAB, AutoCAD and SolidWorks? Or 16 GB would be better? I still have time to exchange the rMBP.

  

  ElCapitan is designed to use as much RAM as possible at all times for efficient operation.  She will move to a video buffer, operations of common files, etc. in the RAM and the y keep in case he should run again.  CBS will move embusked operations out of RAM if new operations is displayed.

  As for "enough RAM for your planned tasks", 8 GB might be enough, given the fast read/write of the SSD and the very fast moving data in the SWAP file on the SSD.  But if you have any doubt, you have 14 days to return without any doubt and re - buy a Go 156 system.

• speed of the vehicle by the encoder reading

  Goodmorning Labiview users,

  I need to get an encoder in an electric vehicle speed information. Is a quadrature encoder (64 pulse) with two signals: A and B (and obviously gnd). My equipment is:

  -Compact Rio ni9024

  -module NI 9401 (FPGA)

  I couldn't find an example for my situation,

  I'll be you grateful if you help me. Thanks, has soon.

  In 2012, LabVIEW, it is an example for a decoder in Quadrature with the Position and the speed on a CRIO. I have attached a screenshot incase you don't have access to it.

  The example uses an index entry, however if you use it you can connect this output to a value constant false and the code will work fine.

  Each clock cycle, the FPGA read quadrature inputs. If there is a change, it will calculate the direction (based on the latest values on entries) and either increment or decrement the position. He will also check the number of cycles of the FPGA to calculate how many ticks are passing between the counties of the encoder. You can then read these indicators in your RTW program.

  You will need to configure your project accordingly so that the entries of encoders are mapped on the pins of your device. This VI should give you a great jumpstart on the problem.