6008 USB digitizer continuous data stream to be used by a third party software
Hi all,
I am trying to achieve a seemingly straight forward task and could do with some expert advice. I have a USB 6008 digitizer which is reading three channels of analogue data. I need to continuously stream data which can be accessed by a third party software for other things (signal processing, visualisation etc). I am proposing to record 10sec length of data and save it in a file in a designated location and repeat this and carry on as long as the programme is running. This will have generated a number of files each with fixed length of data which can be sequentially accessed by the third party program.I will then need to make this VI a standalone application which can be run a LabVIEW less machine.
The other method, may perhaps be, to use toggle between two data files- write in one file-save it, write in the second file and access the first file and overwrite the first file while access the second file.
Could anyone please help me with some ideas, expecially with the writing in files modules?
The first approach is rather straightforward. Create the filenames programmatically, typically by adding 1 to a number at the end of the previous filename. The string and path manipulation functions can easily do this. This would produce a series of files named filename, filename1, filename2, filename3, filename4, ...
The alternating file approach is also feasible. The key there is coordination between the two programs so that they are not both competing for the same file. You need to have a plan for what to do with the data if the alternate file has not been released by the other program when LV needs to write to it.
Lynn
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It looks for me that the ‘shard memory’ principle (or File Mapping) is the most convenient method. In VC++ under windows I can easily handle shared memory by calling FileMapping windows functions. Now the question is how can I do that in LabView? I am relatively new in LabView and do not know if it is possible to use shared memory in LabView. For example: is it possible in LabView to buffer both video streams and IMU-data (live) in a shared memory in computer RAM using the windows FileMaping functions (may be using .dll). Then I can access the RAM form my own software and read the stream. Please see the attachment for more description.
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Hello all.
I'm working on a project which involves connecting to a motion tracker and reading position and orientation data from it in realtime. The code to get the data is in c++, so I decided that the best way to do this would be to create a c++ DLL file which contains all the necessary functions to first connect to the device and read the data from it, and use the Call Library Function node to feed this data into Labview.
I'm having trouble though, since ideally I would like a continuous stream of data from the c++ code into Labview, and I'm not sure how to achieve this. Putting the call library function node in a while loop seems like an obvious solution, but if I do it this way I would have to reconnect to the device every time I get the data, which is quite a bit too slow.
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I'm using Labview 2010, version 10.0.
Apologies if the question is poorly phrased, many thanks for your help.
Dave
Solved!
Go to Solution.dr8086 wrote:
This method sounds like an excellent suggestion, but I do have a few questions where I dont think I've understood fully.
From what I understand the basic premise is to use one call library function node to access a DLL which creates an instance of the device object, and passes a pointer too it into labview. Then a seperate call library function node would pass this pointer to another DLL which could access the device object, update it and read the data. This part could be in a while loop and carry on reading the data until a stop command is given.
That's it. I'm including some skeleton code as an example. I'm also including the code because I don't know how much you have experience with multi threading, so I'm showing how you'd have to use critical sections to guard the interactions between threads so that they don't lead to issues.
// exported function to access the devices
extern "C" __declspec(dllexport) int __stdcall init(uintptr_t *ptrOut)
*ptrOut= (uintptr_t)new CDevice();
return 0;
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return ((CDevice*)ptr)->get_data(vals, size);
extern "C" __declspec(dllexport) int __stdcall close(uintptr_t ptr, double last_vals[], int size)
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((CDevice*)ptr)->get_data(last_vals, size);
delete (CDevice*)ptr;
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class CDevice
public:
virtual ~CDevice();
int init();
int get_data(double vals[], int size);
int close();
// only called by new thread
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private:
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vhtTrackerEmulator *tracker;
HANDLE hThread;
double buffer[500];
int buffer_used;
bool done; // this HAS to be protected by critical section since 2 threads access it. Use a get/set method with critical sections inside
//cpp file
DWORD WINAPI DeviceProc(LPVOID lpParam)
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dr8086 wrote:
My main concern is that the object may go out of memory or be deallocated, since it wouldnt be held in any namespace or anything.
Since you create the object with new, the object won't expire until either the dll is unloaded or the process (LabVIEW) closes. So the object will stay valid between dll calls provided LabVIEW didn't unload the dll (which it does if the VIs are closed). When that happens, I'm not exactly sure what happens to live objects (i.e. if you forgot to call close), I imagine the system reclaims the memory but the device might still be open.
What I do to make sure that everything gets closed when the dll unloads before I could call close and delete the object is to everytime I create a new object in the dll I add it to a list, when the dll unloads, if the object is still on the list I delete it.
dr8086 wrote:
I also have a more general programming question about the purpose of the buffer. Would the buffer basically be a big table of position values, which are stored until they can be read into the rest of the VI?
Yes, see the example code.
However, depending on the frequency with which you need to collect data from the device you might not need this buffer at all. I.e. if you collect a sample about every 100ms then you could remove all threading and buffer related functions and instead read the data from the read function itself like this:
double CDevice::get_data()
tracker->update();
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Because you'd only need a buffer and a seperate thread if you collect data at a high frequency and you cannot lose any data.
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LinkedIn | Twitter ]
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I have a network enabled force transducer (6-axis load cell). I know its IP addr. and the data format it is sending the data out (7 32-bit DWORD, One status and 6 axis force data) . I have been playing around with the simple data client.vi example program.
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Hello All,
We are using a two tier architecture.
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