Subversion Repositories qaz_libs

//////////////////////////////////////////////////////////////////////
////                                                              ////
//// Copyright (C) 2018 Authors and OPENCORES.ORG                 ////
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//// This source file may be used and distributed without         ////
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//// This source file is free software; you can redistribute it   ////
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//// Public License as published by the Free Software Foundation; ////
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//// useful, but WITHOUT ANY WARRANTY; without even the implied   ////
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//////////////////////////////////////////////////////////////////////

class spi_driver
  extends uvm_driver #(spi_sequence_item);
   `uvm_component_utils(spi_driver)

  // --------------------------------------------------------------------
  virtual spi_if vif;

  //--------------------------------------------------------------------
  function void set_default;
    vif.sclk <= 0;
    vif.ss_n <= 1;
    vif.mosi <= 'x;
  endfunction: set_default

  //--------------------------------------------------------------------
  virtual task run_phase(uvm_phase phase);
    spi_sequence_item item;
    int index;

    set_default();

    forever
    begin
      index = 0;
      seq_item_port.get_next_item(item);

      vif.ss_n <= 0;
      vif.mosi <= item.mosi_data[index];
      #(vif.period / 2);

      fork
        repeat(item.data_width)
        begin
          #(vif.period / 2);
          vif.sclk <= 1;
          #(vif.period / 2);
          vif.sclk <= 0;
        end
      join_none

      repeat(item.data_width)
      begin
        @(vif.cb_rise);
        item.miso_data[index] = vif.miso;
        index++;
        @(vif.cb_fall);
        vif.mosi <= item.mosi_data[index];
      end

      #(vif.period / 2);
      vif.ss_n <= 1;

      set_default();
      seq_item_port.item_done();
    end

  endtask : run_phase

  //--------------------------------------------------------------------
  function new(string name, uvm_component parent);
    super.new(name, parent);
  endfunction

// --------------------------------------------------------------------
endclass : spi_driver