Re: [myhdl-list] co-simulation: vpi file

[<dan...@we...>]

George Pantazopoulos wrote:
> Hi all, in the example taken from the docs below, where is the myhdl.vpi
> file supposed to come from?
> 
> Thanks,
> George
> 
> 
> import os
> 
> from myhdl import Cosimulation
> 
> cmd = "iverilog -o bin2gray -Dwidth=%s bin2gray.v dut_bin2gray.v"
>      def bin2gray(B, G, width):
>    os.system(cmd % width)
>    return Cosimulation("vvp -m ./myhdl.vpi bin2gray", B=B, G=G)
> 

I did not pay attention whether one of the development snapshots Jan put
on the page are complete. But if you download the 0.4 code and unpack
it, there is a cosimulation directory with an Icarus folder. In there is
a myhdl.c file which needs to be compiled and put in the folder,
specified in the README.txt file.

I saw you are using cygwin. I had trouble getting cosimulation going
under it, but that might be because of my strange setup with python. I
have the native windows python and that does not support the os.fork
command, which the myhdl cosimulation is relying on.

Now I tried the cygwin python version, which solved the os.fork problem,
but got some other error message. As I also use Linux I did not follow
up on that problem. I wonder whether it comes form the fact that I have
Icarus as windows package. I probably would need to compile it from
scratch under cygwin too to get it working.

Hope that helps.

Cheers,

Guenter