How to compile and run a verilog program which calls C function?

Question

I am not trying to use a DPI call, but a simple Verilog program which internally uses its PLI to call a function written in C language. I don't know about static linking. I am using edaplayground.

Can anyone tell me which simulator should I use and switch should I pass to link both Verilog and C? Should I include the C file in the Verilog?

The sample code is as follows

// C function implementation
#include <stdio.h>  
void hello() {
   printf ("\nHello world\n");
 }

// SV function call
module sv_pli ();

  initial begin
    $hello;
     #10  $finish;
  end

 endmodule

I would like to know if there was any need to register the pli since currently the pli call hello is not detected.

@Olaf: Verilog is a simulation language, and functions can be called during simulation just like in a programming language. It's not a weird question if you remember that Verilog isn't just a hardware description language. — user541686
– user541686, Commented Aug 16, 2015 at 6:08
@Mehrdad: It is a hardware description language, like VHDL. The functions still describe the hardware. OP might refer to System-Verilog (as the tag indicated, but that is not Verilog as his headline and text states. Anyway, the question is clearly OT. — too honest for this site
– too honest for this site, Commented Aug 16, 2015 at 13:33
@Olaf: it is both a hardware description language and a language to aid simulating the described hardware. Only a portion of the language is used to describe hardware that can actually be synthesized. The rest is used for simulation and can contain calls to PLI, which can be written in C. — mcleod_ideafix
– mcleod_ideafix, Commented Aug 16, 2015 at 14:18
Just the opposite - DPI runs much faster than the equivalent VPI. And if you stick with passing C compatible types (int byte and arrays of these) it could be orders of magnitude faster. — dave_59
– dave_59, Commented Aug 19, 2015 at 21:00

jclin · Accepted Answer · 2018-07-18 22:33:44Z

0

I put your C code in a new file named test.c, and added SV-DPI to your Verilog code, removed dollar sign from $hello task to become a DPI call.

See the simulator output and it should be the expected result from your sample code.

edited Jul 18, 2018 at 22:33

answered Aug 19, 2015 at 0:13

jclin

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