Use M-Series cards with DAQmx in Matlab!

[Wendelin]

Jens,

Finally it works! I tested with MatLab 7.0 and now I can use all these call functions. yupeee!

There is one last thing I cant figure out:

     [a,b,c,d] = calllib('nicaiu','DAQmxCreateDOChan',get(taskh1,'Value'),...
        'Dev1/port0','',DAQmx_Val_ChanForAllLines)

gives

??? Error using ==> calllib
No method with matching signature.

Error in ==> DAQmx at 58
     [a,b,c,d] = calllib('nicaiu','DAQmxCreateDOChan',get(taskh1,'Value'),...

So analog in works, but not the digital out . I am using the PCI-6143 card with 8AI and DIO.

Ever tried to set tasks up in MAX and then call them via Matlab?

Regards

Wendelin

[Jens_DE]

Hi Wendelin!

Glad that it works for you!
The error message "No method with matching signature."
indicates that either the number of the input or output arguments is wrong.
Do a libfunctionsview to see what these should be.

> Ever tried to set tasks up in MAX and then call them via Matlab?
I remember thinking about that but I think I never tried.
It would probably be a nice way as long as you do not need full versatility from Matlab.
Worth a try 😉 Looking forward to your findings 🙂

Cya
Jens

[Wendelin]

Hi Jens,

Ok, I am probably one of the worst Matlab programmers:

     [a,b,c,d] = calllib('nicaiu','DAQmxCreateDOChan',get(taskh1,'Value'),...
        'Dev1/port0','',DAQmx_Val_ChanForAllLine

 [a,b,c,d]  were the same types as already defined above by other function calls, this gave a mismatch, as I didnt clear them .

By any chance one last question:

reserved=libpointer('uint32Ptr',[]);
digidata=uint8([0,1,0,1,1,1,1,1]);
write = libpointer('uint8Ptr',digidata);

[aDset,bDset,cDset,dDset] = calllib('nicaiu','DAQmxWriteDigitalLines',get(taskh1,'Value'),...
        uint32(1),uint32(1),double(10.0),DAQmx_Val_GroupByChannel,write,reserved,reserved)
%[int32, uint8Ptr, int32Ptr, uint32Ptr] DAQmxWriteDigitalLines(uint32, int32, uint32, double, uint32, uint8Ptr, int32Ptr, uint32Ptr)
% int32 DAQmxWriteDigitalLines (TaskHandle taskHandle, int32 numSampsPerChan, bool32 autoStart, float64 timeout, bool32 dataLayout,
% uInt8 writeArray[], int32 *sampsPerChanWritten, bool32 *reserved);

gives me

??? Error using ==> calllib
Pointer types must match data type.

Error in ==> DAQmx at 99
[aDset,bDset,cDset,dDset] = calllib('nicaiu','DAQmxWriteDigitalLines',get(taskh1,'Value'),...

I had thought I had figured that out...but...

Any hint!

Thx again and sorry for bothering so often....

Wendelin

[LukeC]

Hi,

Could someone please explain what error -200230 (DAQmxErrorNULLPtrForC_Api) means. I am using the matlab DLL interface with the NI-DAQmx drivers on a PCI-6229 M-Series card.

I want to read counter values from a channel created with DAQmxCreateCICountEdgesChan however this error shows up and I cannot understand why.

I am calling the function using the method shown below, can anyone see any problems?

DataPtr = libpointer('uint32Ptr',[]);
reserved = libpointer('uint32Ptr',[]);

[status Data reserved] = calllib('DAQmxLib','DAQmxReadCounterScalarU32',TaskHandle,10,DataPtr,reserved);

There are no errors during task and channel creation, only when I try to read the value.

Thanks

Luke

[Wendelin]

Hi

I think DataPtr = libpointer('uint32Ptr',[]);

should be

DataPtr = libpointer('uint32Ptr',0);

cause it is a pointer to data, not a char string as the NULL.

Thats my guess

Wendelin

[befaiz]

Hi,

is it  possible with R-serie in Matlab?

thanks

befaiz

[Jens_DE]

Hi Befaiz!

I am not familiar with the R-Series. I think these are pure FPGA cards that need to be programmed with the LabView FPGA module. I might be wrong, though.
The code I provided basically makes all NIdaqmx (traditional NIdaq similarly) functions available to a Matlab programmer. If the R-series uses NIdaqmx, then you can access them through Matlab as shown.

Best of luck
Jens

[befaiz]

Hi,

thanks for your answer, my problem is,  I want call the configuration of fpga from matlab,

is it possible?

danke

befaiz

[Stim0r]

Excellent post.  I spent a good month getting my PCI-6221 to talk to matlab.  I think a lot of people are going to find this useful.

[befaiz]

Hi StimOr,

thanks for your interest ,my sytem is a PXI with FPGA ( R-series 7813R).

 More information about this topic are very auxiliary-rich for me

Ciao

befaiz