ModelSim SE User's Manual - Electrical and Computer Engineering

UM-584 D - Verilog PLI / VPI / DPI
DPI example
ModelSim SE User’s Manual
The following example is a trivial, but complete DPI application. For win32 and RS6000
platforms, one additional step is required along with some new arguments. For the latest
detailed instructions for compiling and simulating DPI imported and exported tasks and
functions, see the modeltech/examples/dpi directory. There you will find examples with a
subdirectory for each platform that contains the platform specific commands and
arguments.
hello_c.c:
#include "svdpi.h"
#include "dpiheader.h"
int c_task(int i, int *o)
{
printf("Hello from c_task()\n");
verilog_task(i, o); /* Call back into Verilog */
*o = i;
return(0); /* Return success (required by tasks) */
}
hello.v:
module hello_top;
int ret;
export "DPI" task verilog_task;
task verilog_task(input int i, output int o);
#10;
$display("Hello from verilog_task()");
endtask
import "DPI" context task c_task(input int i, output int o);
initial
begin
c_task(1, ret); // Call the c task named 'c_task()'
end
endmodule
Compile the Verilog code:
% vlib work
% vlog -sv -dpiheader dpiheader.h hello.v
Compile the DPI code for the Solaris operating system:
% gcc -c -g -I/modeltech/include hello_c.c
% ld -G -o hello_c.so hello_c.o
Simulate the design:
% vsim -c -sv_lib hello_c hello_top
# Loading work.hello_c
# Loading ./hello_c.so
VSIM 1> run -all
# Hello from c_task()
# Hello from verilog_task()
VSIM 2> quit