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Initializing DPI function

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Hello All,
         I wrote a C function and wrote a DPI and accessing the C-Function in SV code. The function is working perfectly fine, but some times the function behaves differently, meaning the output values is getting toggled at different times, is there any ways to initializing the DPI functions to some defalut values?

QuestVlsi


Originally posted in cdnusers.org by sundar_80
Parents

  • If I understand your question correctly you can use a static C variable:

    ---file: mydpi.c---
    static int myglobal = 5;


    int funcadd(int a) {
    myglobal = myglobal + a;
    return (myglobal);
    }



    int funcsub(int a) {
    myglobal = myglobal - a;
    return (myglobal);
    }


    ----file: top.sv----
    module m;
    import "DPI-C" context funcadd = function int funcadd (input int a);
    import "DPI-C" context funcsub = function int funcsub (input int a);

    initial begin
    $display("funcadd = ",funcadd(5) );
    $display("funcsub = ",funcsub(7) );
    end


    endmodule

    --------------
    this will result in:
    ncsim> run
    funcadd = 10
    funcsub = 3
    ncsim: *W,RNQUIE: Simulation is complete.

    ------compile script-----------
    irun mydpi.c top.sv


    Originally posted in cdnusers.org by tmackett
Reply

  • If I understand your question correctly you can use a static C variable:

    ---file: mydpi.c---
    static int myglobal = 5;


    int funcadd(int a) {
    myglobal = myglobal + a;
    return (myglobal);
    }



    int funcsub(int a) {
    myglobal = myglobal - a;
    return (myglobal);
    }


    ----file: top.sv----
    module m;
    import "DPI-C" context funcadd = function int funcadd (input int a);
    import "DPI-C" context funcsub = function int funcsub (input int a);

    initial begin
    $display("funcadd = ",funcadd(5) );
    $display("funcsub = ",funcsub(7) );
    end


    endmodule

    --------------
    this will result in:
    ncsim> run
    funcadd = 10
    funcsub = 3
    ncsim: *W,RNQUIE: Simulation is complete.

    ------compile script-----------
    irun mydpi.c top.sv


    Originally posted in cdnusers.org by tmackett
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