Low Level Programming: Register Access

Hello all,
I am currently on a project in which I am developing an instrument to run on a Windows XP system and utilizing a PC/104 stack for data acquisition. Most of the access to the cards on the stack is performed through drivers provided by the manufacturers of the cards. However, some functionality appears to be missing from one of the drivers and I am now having to manipulate registers to configure things correctly. To do this, I link to a dll that I have written and compiled in Microsoft Visual C++ 2010 Express in which I request access to that segment of memory. Right now, all I am trying to do is read that segment, but currently Labview is throwing the error 1097. The code in the dll is:
BYTE getCtrCfg(WORD address){
BYTE *cfg_Out = (BYTE *)(address + 10);
return *cfg_Out;
(BYTE is an unsigned char and WORD is an unsigned integer). To me, this seems fairly straight forward - all I want is the contents of the 8-bits associated with the base address + 10 specified by the user - I am currently not trying to manipulate the data there. This function compiles and executes with no errors in the console environments so it appears that there is some sort of clash between LV and the dll. Does anybody have any suggestions?
Thanks, Matt
Matt Richardson
Certified LabVIEW Developer
MSR Consulting, LLC
Solved!
Go to Solution.

VISA would be a good idea, but if your vendor driver needs to access that device too, you are in a bit of a catch 22 situation, since Windows does not allow different kernel device drivers to claim the same device.
But one possibility might be a generic IO space kernel driver. The OpenG Port IO driver does provide a kernel driver for 32 bit Windows versions, that can access both IO ports as well as physical memory addresses. The actual LabVIEW interface library supports both IO port and physical memory access but the memory access is not really tested, but it is at least a start.
Modifications to the kernel driver would require installation of a Windows development toolchain including Windows SDK and DDK.
However this uses Windows kernel functionality that has been depreciated since at least Windows 2000, and therfore is most likely not available in 64 Bit Windows at all. So if porting to 64 bit is even a remotely possible requirement, then don't go that route. You would paint yourself into the corner in that way.
To download OpenG libraries including the OpenG Port IO driver you should install VIPM.
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

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Mario Behn
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Christian Loew, CLA
Principal Systems Engineer, National Instruments
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Attachments:
Register_Level_Programming_Architecture.pdf ‏165 KB

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Hello!
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Please check this manual that covers register programming of the device you are using:
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[1] PCI-DIO-96/PXI-6508/PCI-6503 User Manual
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