Re: [vhdl-200x] DPI example

All,

I have attached a simple VHPI example demonstrating a call out from VHDL
to a C function, which returns a random integer. There is more
boilerplate code required to register the foreign function when compared
to Hans' DPI example but I don't believe it's too onerous.

I'm not sure whether it's possible to call a VHDL function from C. If it
isn't, perhaps we should look to extend VHPI to include this capability.

Thanks,

Chris

-----Original Message-----
From: owner-vhdl-200x@eda.org [mailto:owner-vhdl-200x@eda.org] On Behalf
Of hans@ht-lab
Sent: 17 February 2011 18:26
To: vhdl-200x@eda.org
Subject: [POSSIBLE VIRUS:###] Re: [vhdl-200x] {Filename?} DPI example

Lets try again this time without the compile script.

Regards,
Hans.
www.ht-lab.com

-----Original Message-----
From: hans@ht-lab
Sent: Thursday, February 17, 2011 6:18 PM
To: vhdl-200x@eda.org
Subject: [vhdl-200x] {Filename?} DPI example

Warning: This message has had one or more attachments removed
Warning: (simple_dpi_test.zip, run.bat).
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information.

Hi All,

As mentioned during the meeting I have attached a simple 2 way DPI
example.

If you look at tb.sv you will see that in line 53 a simple C function is
called. The only thing you need to do to make this work is to "import"
the
function which is done in line 20.

Then in the my_function.c code the C function calls a SV function which
is
defined in the tb.sv file. To call a SV from C you need to "export" the
function which is done in line 25 of the tb.sv code.

A simple struct (packet) is passed from SV to C and back to SV again.

Would this be possible with the VHPI?

Regards,
Hans.
www.ht-lab.com

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