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   1 //-----------------------------------------------------------------------------
   2 // Copyright (C) 2014 iZsh <izsh at fail0verflow.com>
   3 //
   4 // This code is licensed to you under the terms of the GNU GPL, version 2 or,
   5 // at your option, any later version. See the LICENSE.txt file for the text of
   6 // the license.
   7 //-----------------------------------------------------------------------------
   8 // testbench for min_max_tracker
   9 `include "min_max_tracker.v"
  10
  11 `define FIN "tb_tmp/data.filtered.gold"
  12 `define FOUT_MIN "tb_tmp/data.min"
  13 `define FOUT_MAX "tb_tmp/data.max"
  14
  15 module min_max_tracker_tb;
  16
  17         integer fin;
  18         integer fout_min, fout_max;
  19         integer r;
  20
  21         reg clk;
  22         reg [7:0] adc_d;
  23         wire [7:0] min;
  24         wire [7:0] max;
  25
  26         initial
  27         begin
  28                 clk = 0;
  29                 fin = $fopen(`FIN, "r");
  30                 if (!fin) begin
  31                         $display("ERROR: can't open the data file");
  32                         $finish;
  33                 end
  34                 fout_min = $fopen(`FOUT_MIN, "w+");
  35                 fout_max = $fopen(`FOUT_MAX, "w+");
  36                 if (!$feof(fin))
  37                         adc_d = $fgetc(fin); // read the first value
  38         end
  39
  40         always
  41                 # 1 clk = !clk;
  42
  43         // input
  44         initial
  45         begin
  46                 while (!$feof(fin)) begin
  47                         @(negedge clk) adc_d <= $fgetc(fin);
  48                 end
  49
  50                 if ($feof(fin))
  51                 begin
  52                         # 3 $fclose(fin);
  53                         $fclose(fout_min);
  54                         $fclose(fout_max);
  55                         $finish;
  56                 end
  57         end
  58
  59         initial
  60         begin
  61                 // $monitor("%d\t min: %x, max: %x", $time, min, max);
  62         end
  63
  64         // output
  65         always @(negedge clk)
  66         if ($time > 2) begin
  67                 r = $fputc(min, fout_min);
  68                 r = $fputc(max, fout_max);
  69         end
  70
  71         // module to test
  72         min_max_tracker tracker(clk, adc_d, 8'd127, min, max);
  73
  74 endmodule