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/*===========================================================================*/

/* Copyright (C) 2001 Authors                                                */

/*                                                                           */

/* This source file may be used and distributed without restriction provided */

/* that this copyright statement is not removed from the file and that any   */

/* derivative work contains the original copyright notice and the associated */

/* disclaimer.                                                               */

/*                                                                           */

/* This source file is free software; you can redistribute it and/or modify  */

/* it under the terms of the GNU Lesser General Public License as published  */

/* by the Free Software Foundation; either version 2.1 of the License, or    */

/* (at your option) any later version.                                       */

/*                                                                           */

/* This source is distributed in the hope that it will be useful, but WITHOUT*/

/* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or     */

/* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public       */

/* License for more details.                                                 */

/*                                                                           */

/* You should have received a copy of the GNU Lesser General Public License  */

/* along with this source; if not, write to the Free Software Foundation,    */

/* Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA        */

/*                                                                           */

/*===========================================================================*/

/*                        SERIAL DEBUG INTERFACE                             */

/*---------------------------------------------------------------------------*/

/* Test the serial debug interface:                                          */

/*                           - Interrupts when going out of halt mode.       */

/*                                                                           */

/* Author(s):                                                                */

/*             - Olivier Girard,    olgirard@gmail.com                       */

/*                                                                           */

/*---------------------------------------------------------------------------*/

/* $Rev: 19 $                                                                */

/* $LastChangedBy: olivier.girard $                                          */

/* $LastChangedDate: 2009-08-04 23:47:15 +0200 (Tue, 04 Aug 2009) $          */

/*===========================================================================*/

reg [15:0] r13_bkup;

initial

   begin

      $display(" ===============================================");

      $display("|                 START SIMULATION              |");

      $display(" ===============================================");

`ifdef DBG_EN

`ifdef DBG_UART

      #1 dbg_en = 1;

      repeat(30) @(posedge mclk);

      stimulus_done = 0;

      // Initialize the debug interface and send the CPU in halt mode

      dbg_uart_tx(DBG_SYNC);

`ifdef DBG_RST_BRK_EN

      dbg_uart_wr(CPU_CTL,  16'h0002);  // RUN

`endif

      // Wait until software initialization is done

      if (r15!==(`PER_SIZE+16'h0000))

        @(r15==(`PER_SIZE+16'h0000));

      dbg_uart_wr(CPU_CTL,  16'h0001);  // HALT

      repeat(150) @(posedge mclk);

      r13_bkup = r13;

      // Generate a GPIO interrupt

      p1_din[0] = 1'b1;

      repeat(150) @(posedge mclk);

      // Re-start the CPU

      dbg_uart_wr(CPU_CTL,  16'h0002);  // RUN

      repeat(150) @(posedge mclk);

      // Make sure the interrupt was serviced

      if (r14 !== 16'haaaa) tb_error("====== Interrupt was not properly serviced =====");

      // Make sure the program resumed execution when coming back from IRQ

      if (r13 === r13_bkup) tb_error("====== Program didn't properly resumed execution =====");

      p1_din[1] = 1'b1;

      stimulus_done = 1;

`else

       $display(" ===============================================");

       $display("|               SIMULATION SKIPPED              |");

       $display("|   (serial debug interface UART not included)  |");

       $display(" ===============================================");

       $finish;

`endif

`else

       $display(" ===============================================");

       $display("|               SIMULATION SKIPPED              |");

       $display("|      (serial debug interface not included)    |");

       $display(" ===============================================");

       $finish;

`endif

   end