fpga/tests/tb_lf_edge_detect.v

   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 lf_edge_detect
   9 `include "lf_edge_detect.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 `define FOUT_STATE "tb_tmp/data.state"
  15 `define FOUT_TOGGLE "tb_tmp/data.toggle"
  16 `define FOUT_HIGH "tb_tmp/data.high"
  17 `define FOUT_HIGHZ "tb_tmp/data.highz"
  18 `define FOUT_LOWZ "tb_tmp/data.lowz"
  19 `define FOUT_LOW "tb_tmp/data.low"
  20
  21 module lf_edge_detect_tb;
  22
  23         integer fin, fout_state, fout_toggle;
  24         integer fout_high, fout_highz, fout_lowz, fout_low, fout_min, fout_max;
  25         integer r;
  26
  27         reg clk = 0;
  28         reg [7:0] adc_d;
  29         wire adc_clk;
  30         wire data_rdy;
  31         wire edge_state;
  32         wire edge_toggle;
  33
  34     wire [7:0] high_threshold;
  35     wire [7:0] highz_threshold;
  36     wire [7:0] lowz_threshold;
  37     wire [7:0] low_threshold;
  38     wire [7:0] max;
  39     wire [7:0] min;
  40
  41         initial
  42         begin
  43                 clk = 0;
  44                 fin = $fopen(`FIN, "r");
  45                 if (!fin) begin
  46                         $display("ERROR: can't open the data file");
  47                         $finish;
  48                 end
  49                 fout_min = $fopen(`FOUT_MIN, "w+");
  50                 fout_max = $fopen(`FOUT_MAX, "w+");
  51                 fout_state = $fopen(`FOUT_STATE, "w+");
  52                 fout_toggle = $fopen(`FOUT_TOGGLE, "w+");
  53                 fout_high = $fopen(`FOUT_HIGH, "w+");
  54                 fout_highz = $fopen(`FOUT_HIGHZ, "w+");
  55                 fout_lowz = $fopen(`FOUT_LOWZ, "w+");
  56                 fout_low = $fopen(`FOUT_LOW, "w+");
  57                 if (!$feof(fin))
  58                         adc_d = $fgetc(fin); // read the first value
  59         end
  60
  61         always
  62                 # 1 clk = !clk;
  63
  64         // input
  65         initial
  66         begin
  67                 while (!$feof(fin)) begin
  68                         @(negedge clk) adc_d <= $fgetc(fin);
  69                 end
  70
  71                 if ($feof(fin))
  72                 begin
  73                         # 3 $fclose(fin);
  74                         $fclose(fout_state);
  75                         $fclose(fout_toggle);
  76                         $fclose(fout_high);
  77                         $fclose(fout_highz);
  78                         $fclose(fout_lowz);
  79                         $fclose(fout_low);
  80                         $fclose(fout_min);
  81                         $fclose(fout_max);
  82                         $finish;
  83                 end
  84         end
  85
  86         initial
  87         begin
  88                 // $monitor("%d\t S: %b, E: %b", $time, edge_state, edge_toggle);
  89         end
  90
  91         // output
  92         always @(negedge clk)
  93         if ($time > 2) begin
  94                 r = $fputc(min, fout_min);
  95                 r = $fputc(max, fout_max);
  96                 r = $fputc(edge_state, fout_state);
  97                 r = $fputc(edge_toggle, fout_toggle);
  98                 r = $fputc(high_threshold, fout_high);
  99                 r = $fputc(highz_threshold, fout_highz);
 100                 r = $fputc(lowz_threshold, fout_lowz);
 101                 r = $fputc(low_threshold, fout_low);
 102         end
 103
 104         // module to test
 105         lf_edge_detect detect(clk, adc_d, 8'd127,
 106                 max, min,
 107                 high_threshold, highz_threshold,
 108                 lowz_threshold, low_threshold,
 109                 edge_state, edge_toggle);
 110
 111 endmodule