Labview Binary Data

I have written some C programs for signal processing. I need to adapt
these programs to accept binary data acquired by a colleague using
Labview.
The colleague mentions that the data is a 2-D array with a time column
and an amplitude column. Furthermore, the the data is stored in 64-bit
IEEE double precision format.
Can anyone tell me how to read this data format into a C program?
Thank you.
Sincerely, Tom Irvine
[email protected]
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In article <823irg$inb$[email protected]>,
[email protected] wrote:
> I have written some C programs for signal processing. I need to adapt
> these programs to accept binary data acquired by a colleague using
> Labview.
>
> The colleague mentions that the data is a 2-D array with a time column
> and an amplitude column. Furthermore, the the data is stored in
64-bit
> IEEE double precision format.
>
> Can anyone tell me how to read this data format into a C program?
>
> Thank you.
>
you could read your data and convert them into the standard 2D array.
The 2D array can be as a input of your CIN.
Of course you need to know the saving format of your partener's file.
Then, if I were you, I would just simply use the I/O function in Labview
--open, read, close..plu
s a while loop to index your read data to a 2D
array... the loop will end by the EOF. Note that you need to "read"
your data is dbl-precision by specifying the "data stream type"
parameter as double-precision data. (Simply right-click the "data stream
type" input and click the "creat constant" in the pop-up menu).
It's simple and neat. I've done several this kind of work..even some
with complex data structure.
Luck,
G. Chen
Ph.D. Candidate
Ohio Univeristy, Athens, OH
Nothing can dim the light which shines from within.
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Similar Messages

Loading Labview Binary Data into Matlab

This post explains the Labview binary data format. I couldn't find all of this information in any one place so this ought to help anyone in the future. I didn't want to add any overhead in Labview so I did all of my conversion in Matlab.
The Labview VI "Write to Binary File" writes data to a file in a linear format using Big Endian numbers of the type wired into the "Write to Binary File" VI. The array dimensions are listed before the actual array data.
fid = fopen('BinaryData.bin','r','ieee-be'); % Open the binary file
Dim1 = fread(fid,4); % Reads the first dimension
Dim2 = fread(fid,4); % Reads the second dimension
Dim3 = ...
Each dimension's length is specified by 4 bytes. Each increment of the first, second, third, and fourth byte represent 2^32, 2^16, 2^8, and 1 respectively. 0 0 2 38 equates to 2*256 + 38 = 550 values for that particular dimension.
As long as you know the number of dimensions and precision of your binary data you can load it.
Data = fread(fid,prod([Dim1 Dim2 Dim3]),'double',0,'ieee-be'); % Load double precision data
If you have appended multiple arrays to the same file in Labview you would repeat this procedure. Load each dimension then load the data, repeat.
Data = fread(fid,prod([Dim1 Dim2 Dim3]),'int8',0,'ieee-be'); % Load int8 precision data or boolean data
I had to create a function for my own purposes so I thought I'd share it with everyone else too. I uploaded it to the Matlab File Exchange. The file is named labviewload.m.
This was tested on Matlab R2007a and Labview 8.2.

Thanks. I have the same questions as I tried to load labview binary data into Matlab.
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How do you read in and work with I24 binary data into LabView?

Hi there,
I have a program that is reading binary data in as 16 bits per sample. I have some binary input files that were saved as 24 bits per sample. How do I convert my old program to handle this data. I realize that LabView doesn't have built in I24 conversion - how do I do this myself? I found a post that referred to using a boolean array to create your own 24 bit number - but I don't understand what that means... Any help would be appreciated!
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Do you know the format of the saved 24-bit data? Can you share some data with us, along with what you think the values are? If it is I24, then every three bytes represents a 24-bit (signed) integer. The first question to answer is "What is the order of the bytes"? How do you want to represent these data? The obvious choices are as an I32, but since the rest of your data is I16, you might choose I16, instead.
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Some binary data recoreded by labview cannot open by other program

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The original data is 32 bit data sets which are separated by a <CRLF>.
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phy_mechanic
Attachments:
attachment.zip ‏1279 KB

The data seems like it can only be read by LabVIEW because LabVIEW is set up to properly read the binary data and it is simple for a user to do.
For matlab to read the data, it will have to be properly configured.
FOPEN    -    Open a file
FREAD     -     Binary file read
FWRITE -     Binary file write
FTELL    -     Return the current file position
FSEEK     -     Set file position indicator
FCLOSE -     Close a file
An example is given from http://www.mathworks.com/support/tech-notes/1400/1403.htm:
%This m-file is a short example of how to read and write a binary file
%in MATLAB using low level routines
%write file
fid = fopen('square_mat.bin','wb') %open file in binary write mode
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fwrite(fid, [1 2 3; 4 5 6; 7 8 9]', 'int32'); %write data to file
fclose(fid); %close file
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fid = fopen('square_mat.bin','rb') %open file
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title = char(bintitle')
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data_tranpose = data' %must transpose data after reading in
fclose(fid) %close file
As you can see, the data type, size, array size, etc. has to be explicitly defined. In addition, as Dennis alluded to, LabVIEW stores binary data in Big-Endian format, wheras most windows applications use little endian. I assume matlab is one of those applications...but I am not a huge matlab developer. Google may have more information on that. You can use a typecast in matlab to convert big to little and little to big, however, so that may be a great place to start. Please see http://www.mathworks.com/access/helpdesk/help/techdoc/ref/typecast.html
Of course, our wonderful applications engineers at National Instruments have already done the above work for you and developed Knowledgebase 11SF83W0: How do I Transfer Data Between The MathWorks, Inc. MATLAB® Software Developm...which is easily searchable from ni.com knowledgebase category using 'matlab binary'
Rob K
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How does Labview stores the binary data - The header, where the actual data starts etc.

I have problem in reading the binary file which is written by labview. I wish to access the data (which is stored in binary format) in Matlab. I am not able to understand - how the data will be streamed in to binary file (the binary file format) when we save the data in to a binary format through Labview program. I am saving my data in binary format and I was not able to access the same data in Matlab.
I found a couple of articles which discusses about converting Labview to Matlab but What I really wanna know is - How can I access the binary file in Matlab which is actually written in Labview?
Once I know the format Labview uses to store its binary files, It may be easy for me to read the file in Matlab. I know that Labview stores the binary files in Big Endian format which is
Base Address+0 Byte3
Base Address+1 Byte2
Base Address+2 Byte1
Base Address+3 Byte0
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Attachments:
Acquire_Binary_LMV.vi ‏242 KB

Hi Everybody!
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Can I Import Data from MATLAB to LabVIEW or Vice Versa?
http://digital.ni.com/public.nsf/websearch/2F8ED0F588E06BE1862565A90066E9BA?OpenDocument
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Attachments:
cluster.jpg ‏16 KB

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DAQ vi to perform digital write and read measurements using 32 bits binary data saved in a file

Hi
DAQ vi to perform digital write and read measurements using 32 bits binary data saved in a file
Two main
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My
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This
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Attachments:
DIO_write_read DAQ from file.vi ‏17 KB

What does your file look like? The DAQmx write is expecting a single U32 value, not an array of I64.
Message Edited by vt92 on 09-16-2009 02:42 PM
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How to set a string input to accept only 1 and 0 (binary data)

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Thanks

Jean-Pierre Drolet wrote:
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BinaryStringControl_III.vi ‏24 KB

Working with Binary data from the Gpib Read Function

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I'm pretty sure what you're describing is a simple typecast in LabVIEW. You will want to strip off the #I first, using string manipulation functions. Then, you can wire the string into a "typecast" VI, and wire a double precision float constant to the top connector of the typecast (this tells the VI that you expect a 64 bit float output) and then you can read your resulting array of double precision floats on the output of the typecast. The typecast VI is found in All Functions >> Advanced >> Data Manipulation.
I've attached an example in LabVIEW 7.0 and also 7.1 format.
Scott B.
Applications Engineer
National Instruments
Attachments:
typecast.vi ‏11 KB
typecast.vi ‏13 KB

Importing very special binary data into Diadem

In order to use DIAdem I need to import binary data from transient recorders. The data is stored in block mode (CH after CH), as X-Y data pairs. All channels have different length but the structure and channel names are written into a special header block, preceeding the data. The X-Y data pairs are written into words (32-bit) with variable X/Y separation, that is that Y maybe e.g. 12-bit wide and thus X using the remaining 20 bits of the word. The X/Y separation position is coded in the header too.
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Marco Mailand
ABB Switzerland Ltd.
High Voltage Technology
Solved!
Go to Solution.

Mr Mailand,
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http://digital.ni.com/softlib.nsf/websearch/D605AA96CF81760C86256C7600742EC5?opendocument&node=132070_US
LabVIEW DIAdem Connectivity VIs Version 2.1
http://digital.ni.com/softlib.nsf/websearch/D73B15862235486D86256D2D00798738?opendocument&node=132070_US
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http://sine.ni.com/apps/we/niepd_web_display.display_epd4?p_guid=D18837DE23EE32F6E034080020E74861&p_node=DZ52246&p_source=External
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Download Binary Data File over Serial Port

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File Transfer.vi ‏57 KB

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Long version:
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Swap binary data endianess

Hello all,
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LabVIEW Champion . Do more with less code and in less time .
Attachments:
ReverseBitsLUT.png ‏5 KB

PbyFwData - Pointer to the firmware binary data stream.

Hello,
I used labview to call a dll, but it have one parameter "pbyFwData" which Pointer to the firmware binary data stream.i don't understand what mean is "Pointer to the firmware binary data stream".I try to make this parameter point to the firmware path, but the program can't be run.the below is the .dll source code. who can tell you how to pass the value to the parameter "pbyFwData" by labview?
// Purpose:      Public function to download the Flash Preloader.
// Parameter:
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ZEEVOPTU_API int ZV4301_SendPreLoader(HANDLE hZvDev,
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   const unsigned long uBlkSize = 0x400;
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   unsigned char byData;
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         nResult = WriteSerial(pZvDev, pbyFwData, uBlkSize);
         pbyFwData += uBlkSize;
         uFwLen -= uBlkSize;
      else
         nResult = WriteSerial(pZvDev, pbyFwData, uFwLen);
         uFwLen = 0;
      if (nResult != SUCCESS)
         return nResult;
   nTmOut = 100;
   while (nTmOut > 0)
   { // getting the respond 0xAA
      if (GetByte(pZvDev, &byData))
         if (byData == 0xAA)
            break;
      Sleep(10);
      nTmOut -= 10;
   if (nTmOut == 0)
      return ERR_DOWNLD_PRELDR;
   nResult = SetCommBaud(pZvDev, FLOWCTRL_DIS, pPort->uBaud, &uDummy);
   return nResult;

Hi,
The pointer is a U32 that points to a memory location where the data is. It is not clear from the prototype whether the pointer points to data that is feeded to the dll, or returned from the dll.
If data is feeded, wire an array to this parameter, and set uFwLen to it's length.
If data is returned, you need to use some other api calls to get the data from memory...
Regards,
Wiebe.
"Jimmy168" <[email protected]> wrote in message news:[email protected]...
Hello,I used labview to call a dll, but it have one parameter "pbyFwData" which Pointer to the firmware binary data stream.i don't understand what mean is "Pointer to the firmware binary data stream".I try to make this parameter point to the firmware path, but the program can't be run.the below is the .dll source code. who can tell you how to pass the value to the parameter "pbyFwData" by labview?
 
//------------------------------------------------------------------------------// Purpose:      Public function to download the Flash Preloader.// Parameter://   hZvDev    - Handle of the Zeevo Device.//   pbyFwData - Pointer to the firmware binary data stream.//   uFwLen    - The length of the preloader.// Return value: SUCCESS if successful; Otherwise, the error code.//------------------------------------------------------------------------------ZEEVOPTU_API int ZV4301_SendPreLoader(HANDLE hZvDev,                                      unsigned char *pbyFwData,                                      unsigned long uFwLen){    ZV4301 *pZvDev;   COMM_DESC *pPort;   int nResult, nTmOut;   const unsigned long uBlkSize = 0x400;   unsigned long uDummy, uCRC;   unsigned char byDataBuf[32];   unsigned char byData;
   if (!Validate(hZvDev))      return ERR_BAD_HANDLE;   pZvDev = (ZV4301 *)hZvDev;   pPort = pZvDev->PortDesc;
   // Setup the Address and Length   memset(byDataBuf, 0, sizeof(byDataBuf));   LD_LoaderProgramAddr(byDataBuf) = LD_ZV4301_LOADER_ADDR;   LD_LoaderProgramLengh(byDataBuf) = uFwLen;   // Calculate the Header CRC   uCRC= UT_CRCBuffer(byDataBuf+4, 8);   LD_LoaderProgramHdrCRC(byDataBuf) = uCRC;   // Calculate the Data CRC   uCRC = CalculateCRC(pbyFwData, uFwLen);   LD_LoaderProgramDataCRC(byDataBuf) = uCRC;   // Detect target reset   nResult = IsChipPwrOnReset(pZvDev, 10000);   if (nResult != SUCCESS)      return nResult;   // send out header first   nResult = WriteSerial(pZvDev, byDataBuf, LD_LOADER_PRGM_HDR_LEN);   if (nResult != SUCCESS)      return nResult;
   while (uFwLen > 0)   {  // sending the preloader file      if (uFwLen >= uBlkSize)      {         nResult = WriteSerial(pZvDev, pbyFwData, uBlkSize);         pbyFwData += uBlkSize;         uFwLen -= uBlkSize;      }      else      {         nResult = WriteSerial(pZvDev, pb

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