CODEWITHSUNDEEP
c#.netpcipci-bus
user965767
user965767

Reputation: 59

Accessing PCI-7250 NuDAQ in .NET

I would like to switch on a relay using a PCI-7250 NuDAQ card using .NET.

I know that the code in VB to turn on is:

card = Register_Card(PCI_7250, 0)

v = DO_WritePort(card, 0, &O17)

and to turn off:

v = DO_WritePort(card, 0, &O0)

I need to migrate this to C# code. Can anyone help me out with this?

Upvotes: 0

Views: 2422

Answers (1)

Captain Coder
Captain Coder

Reputation: 818

If you want to go the way of reading/writing I/O ports, you need to be able to write them. The .net framework (the microsoft one on windows atleast) does not support this directly. For reading/writing to parallel ports i'm having great success with the InOut32 library (link). This means you will have to use PInvoke to make it work. For me this code works:

    [DllImport("inpoutx64.dll", EntryPoint = "Out32")]
    private static extern void OutputImpl(int adress, int value);

    [DllImport("inpoutx64.dll", EntryPoint = "Inp32")]
    private static extern int InputImpl(int adress);

    public static void Output(int adress, int value)
    {
        // I use this wrapper to set debug breakpoints so I can see what's going on
        OutputImpl(adress, value);
    }

    public static int Input(int adress)
    {
        int ret = InputImpl(adress);
        return ret;
    }

Note that if you are running a 32 bit application you will need to referrence the "InOut32.dll" library. I am unsure about the specific ports you need to use, but I imagine you can either find them on the internet, or give it a few tries some from your PCI cards configured IO address range (see the deveice's properties in the device manager).

Upvotes: 1

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