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DPI and Classes

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I'm using the DPI to instantiate and run our firmware and have a problem when the firmware tries to call exported tasks.

I cannot seem to do an export on a class tasks so I have to declare my export tasks outside of the class.

However, I don't know how to call the class member task (which is what I really want) from these outside tasks.


This is my code.  I've tried hierarchical names to get the the write and read member tasks in the driver but get the following error from ncvlog:

  test.prgm.sys.spi.drv.read(address, data);
                                                 |
ncvlog: *E,ILLHIN (../tb/spi/spi_driver.sv,52|49): illegal location for a hierarchical name (in a package).

-------------------------------------------

export

"DPI-C" SV_spi_read = task spi_read;
export "DPI-C" SV_spi_write = task spi_write;

class spi_driver;
extern function new;
extern task write;
extern task read;
endclass : spi_driver

function spi_driver::new;
$display("spi_driver::new()");
endfunction : new

task spi_driver::write(input byte address, input byte data);
$display("spi_write of %x to address %x", data, address);
endtask : write

task spi_driver::read( input byte address, output byte data);;
$display("spi_read of address %x", address);
endtask : read



/////////////////////////////////////////////////////////////
//
// I cannot figure out how to export a class member task to the DPI so
// these two functions are stand-alone functions.
//
task spi_read( input byte address, output byte data);
$display("spi_read of address %x", address);
spi_driver::spi_read(Address, data);  // I don't know how to call class member from here.
endtask : spi_read

task spi_write(input byte address, input byte data);
$display("spi_write of %x to address %x", data, address);
spi_driver::spi_write(Address, data);  // I don't know how to call class member from here.
endtask : spi_write

----------------------------
Originally posted in cdnusers.org by dfechser
Parents
  • archive

    I was playing around with some example code - modifying my previous example on this forum called "Example Test Bench Using Interface and Classes". I inserted the dpi import/export declarations, and the export function inside the interface, and I was able to access the import function from both modules attached to the interface. Perhaps you can use this methodology. Email me for the complete example: tmackett@cadence.com


    Originally posted in cdnusers.org by tmackett
Reply
  • archive

    I was playing around with some example code - modifying my previous example on this forum called "Example Test Bench Using Interface and Classes". I inserted the dpi import/export declarations, and the export function inside the interface, and I was able to access the import function from both modules attached to the interface. Perhaps you can use this methodology. Email me for the complete example: tmackett@cadence.com


    Originally posted in cdnusers.org by tmackett
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