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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        */

/*                                                                           */

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

/*                            DEBUG INTERFACE:  UART                         */

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

/* Test the UART debug interface:                                            */

/*                        - Check synchronization of the serial              */

/*                          debug interface input.                           */

/*                                                                           */

/* Author(s):                                                                */

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

/*                                                                           */

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

/* $Rev: 95 $                                                                */

/* $LastChangedBy: olivier.girard $                                          */

/* $LastChangedDate: 2011-02-24 21:37:57 +0100 (Thu, 24 Feb 2011) $          */

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

`define VERY_LONG_TIMEOUT

integer    ii;

reg [15:0] jj;

initial

   begin

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

      $display("|                 START SIMULATION              |");

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

`ifdef DBG_EN

`ifdef DBG_UART

      #1 dbg_en = 1;

      repeat(30) @(posedge mclk);

      stimulus_done = 0;

      // Enable metastablity emulation for the RXD path

      dbg_uart_rxd_meta = 1'b1;

      //--------------------------------------------------------

      // TRY VARIOUS SERIAL DEBUG INTERFACE TRANSFER

      // WITH DIFFERENT BAUD-RATES

      //--------------------------------------------------------

      for ( ii=0; ii < 500; ii=ii+1)

        begin

           #1 reset_n = 0;

           repeat(1) @(posedge mclk);

           #1 reset_n = 1;

           repeat(10) @(posedge mclk);

           UART_PERIOD = 650 + 1*ii;

           $display("Synchronisation test for DBG_UART_PERIOD = %5d ns  /  ii = %-d", UART_PERIOD, ii);

           // SEND UART SYNCHRONIZATION FRAME

           dbg_uart_sync;

           // READ CPU_ID

           dbg_uart_rd(CPU_ID_LO);

           if (dbg_uart_buf !== dbg_cpu_id[15:0])

             begin

                $display("CPU_ID_LO: read = 0x%-4h / expected = 0x%-4h", dbg_uart_buf, dbg_cpu_id[15:0]);

                tb_error("====== CPU_ID_LO incorrect (test 1) =====");

                force_end_of_sim;

             end

           dbg_uart_rd(CPU_ID_HI);

           if (dbg_uart_buf !== dbg_cpu_id[31:16])

             begin

                $display("CPU_ID_HI: read = 0x%-4h / expected = 0x%-4h", dbg_uart_buf, dbg_cpu_id[31:16]);

                tb_error("====== CPU_ID_HI incorrect (test 1) =====");

                force_end_of_sim;

             end

           //-----------------------------------

           // MAKE SOME READ/WRITE ACCESS

           //-----------------------------------

           jj = 'h4328;

           dbg_uart_wr(MEM_DATA,  16'h4328);

           dbg_uart_rd(MEM_DATA);

           if (dbg_uart_buf !== 16'h4328)

             begin

                $display("DMEM_DATA: read = 0x%-4h / expected = 0x4328", dbg_uart_buf);

                tb_error("====== MEM_DATA incorrect (test 1) =====");

                force_end_of_sim;

             end

           jj = 'h3280;

           dbg_uart_wr(MEM_DATA,  16'h3280);

           dbg_uart_rd(MEM_DATA);

           if (dbg_uart_buf !== 16'h3280)

             begin

                $display("DMEM_DATA: read = 0x%-4h / expected = 0x3280", dbg_uart_buf);

                tb_error("====== MEM_DATA incorrect (test 2) =====");

                force_end_of_sim;

             end

           jj = 'h2800;

           dbg_uart_wr(MEM_DATA,  16'h2800);

           dbg_uart_rd(MEM_DATA);

           if (dbg_uart_buf !== 16'h2800)

             begin

                $display("DMEM_DATA: read = 0x%-4h / expected = 0x2800", dbg_uart_buf);

                tb_error("====== MEM_DATA incorrect (test 1) =====");

                force_end_of_sim;

             end

           jj = 'h8000;

           dbg_uart_wr(MEM_DATA,  16'h8000);

           dbg_uart_rd(MEM_DATA);

           if (dbg_uart_buf !== 16'h8000)

             begin

                $display("DMEM_DATA: read = 0x%-4h / expected = 0x8000", dbg_uart_buf);

                tb_error("====== MEM_DATA incorrect (test 2) =====");

                force_end_of_sim;

             end

           jj = 'h0000;

           dbg_uart_wr(MEM_DATA,  16'h0000);

           dbg_uart_rd(MEM_DATA);

           if (dbg_uart_buf !== 16'h0000)

             begin

                $display("DMEM_DATA: read = 0x%-4h / expected = 0x0000", dbg_uart_buf);

                tb_error("====== MEM_DATA incorrect (test 2) =====");

                force_end_of_sim;

             end

           jj = 'hffff;

           dbg_uart_wr(MEM_DATA,  16'hffff);

           dbg_uart_rd(MEM_DATA);

           if (dbg_uart_buf !== 16'hffff)

             begin

                $display("DMEM_DATA: read = 0x%-4h / expected = 0xffff", dbg_uart_buf);

                tb_error("====== MEM_DATA incorrect (test 2) =====");

                force_end_of_sim;

             end

           jj = 'h7f7f;

           dbg_uart_wr(MEM_DATA,  16'h7f7f);

           dbg_uart_rd(MEM_DATA);

           if (dbg_uart_buf !== 16'h7f7f)

             begin

                $display("DMEM_DATA: read = 0x%-4h / expected = 0x7f7f", dbg_uart_buf);

                tb_error("====== MEM_DATA incorrect (test 2) =====");

                force_end_of_sim;

             end

           jj = 'h55aa;

           dbg_uart_wr(MEM_DATA,  16'h55aa);

           dbg_uart_rd(MEM_DATA);

           if (dbg_uart_buf !== 16'h55aa)

             begin

                $display("DMEM_DATA: read = 0x%-4h / expected = 0x55aa", dbg_uart_buf);

                tb_error("====== MEM_DATA incorrect (test 2) =====");

                force_end_of_sim;

             end

           jj = 'h5aa5;

           dbg_uart_wr(MEM_DATA,  16'h5aa5);

           dbg_uart_rd(MEM_DATA);

           if (dbg_uart_buf !== 16'h5aa5)

             begin

                $display("DMEM_DATA: read = 0x%-4h / expected = 0x5aa5", dbg_uart_buf);

                tb_error("====== MEM_DATA incorrect (test 2) =====");

                force_end_of_sim;

             end

        end

      //--------------------------------------------------------

      // TRY LONGEST POSSIBLE SYNCHRONIZATION FRAME

      //--------------------------------------------------------

      #1 reset_n = 0;

      repeat(1) @(posedge mclk);

      #1 reset_n = 1;

      repeat(10) @(posedge mclk);

      dbg_uart_rxd_pre = 1'b0;

      @(posedge dut.dbg_0.dbg_uart_0.sync_cnt[`DBG_UART_XFER_CNT_W+2]);

      dbg_uart_rxd_pre = 1'b1;

      repeat(100) @(posedge mclk);

      dbg_uart_rxd_pre = 1'b0;

      @(posedge dut.dbg_0.dbg_uart_0.xfer_cnt[`DBG_UART_XFER_CNT_W-1]);

      dbg_uart_rxd_pre = 1'b1;

      repeat(100) @(posedge mclk);

      //--------------------------------------------------------

      // END OF TEST

      //--------------------------------------------------------

      #1 reset_n = 0;

      repeat(1) @(posedge mclk);

      #1 reset_n = 1;

      repeat(10) @(posedge mclk);

      UART_PERIOD = 550;

      $display("Synchronisation test for DBG_UART_PERIOD = %5d ns  /  ii = %-d", UART_PERIOD, ii);

      // SEND UART SYNCHRONIZATION FRAME

      dbg_uart_sync;

      // Let the CPU run

      dbg_uart_wr(CPU_CTL,  16'h0002);

      // Generate an IRQ

      wkup[0]   = 1'b1;

      @(negedge mclk);

      irq[0]    = 1'b1;

      @(negedge irq_acc[0])

      @(negedge mclk);

      wkup[0]   = 1'b0;

      irq[0]    = 1'b0;

      repeat(10) @(posedge mclk);

      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

   task force_end_of_sim;

      begin

         repeat(10) @(posedge mclk);

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

         $display("|               SIMULATION FAILED               |");

         $display("|     (some verilog stimulus checks failed)     |");

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

         $finish;

      end

   endtask