MATLAB: How to return a pointer for the Aardvark API

aardvarkdata type

I'm using Total Phase's Aardvark USB Adapter and I'm wondering how to return a pointer?

I'm trying to use:

dataOut = [0 18];
dataTargetID = NET.createArray('System.Byte',19);
TotalPhase.AardvarkApi.aa_i2c_write_read(aard_device, slaveAddress, ... TotalPhase.AardvarkI2cFlags.AA_I2C_NO_FLAGS, 2, dataOut, write_count, 19, dataTargetID, read_count);

and I want to get write_count and read_count. From the user manual: http://www.totalphase.com/support/articles/200468316-Aardvark-Adapter-User-Manual#s5.5

it says the input is a unsigned short pointer?

I've tried:

    read_count = NET.createArray('System.UInt16',1);
    read_count = libpointer('UInt16');
    read_count = 0;

but I always get the error:

    No method 'aa_spi_slave_read' with matching signature found for class
    'TotalPhase.AardvarkApi'.

Thanks!

-Mike

Best Answer

Use 'methodsview TotalPhase.AardvarkApi' to see what aa_write_read returns. The read_count and write_count is returned so passing by reference isn't needed

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MATLAB: Calling shared lib functions – serial port

Hi David,

What you are doing seems to be the correct approach. What would really be useful is to check the header file that you have and see the function signatures. Loadlibrary commands are susceptible to datatypes being passed. For example:

callib(A2D, 'Ser1chOpen',port,NULL)

function could be expecting an unsigned int as the input for the port. But you are passing a double (since MATLAB defaults to a double). You would see the types it expects with libfunctionsview as well.

Also what is the exact error and which line of code?

MATLAB: Loadlibrary issue with dll

These lines of code :

 typedef unsigned __int8   u08;

Are making use of a Microsoft extension to the c language ( __int8 ) and are not supported by loadlibrary. There may be no easy solution to the problem. I would probably make a copy of aardvark.h and edit it as need to make loadlibrary work. Your other option is to give up on loadlibrary and create your own mex file.

To make a modified version of aardvark.h work the typedefs secion might need to look like:

 typedef unsigned char   u08;
 typedef unsigned short  u16;
 ...
 typedef char   s08;
 typedef short s16;
 ...

To get the include of aardvark to work correctly you might need to change it to

#include "aardvark.h"

That is standard c syntax if the header is in the same directory and not on the include path.

Best Answer

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MATLAB: Loadlibrary issue with dll

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