New LF edge detection algorithm + lowpass filter

[proxmark3-svn] / fpga / tests / tb_min_max_tracker.v

diff --git a/fpga/tests/tb_min_max_tracker.v b/fpga/tests/tb_min_max_tracker.v
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+++ b/fpga/tests/tb_min_max_tracker.v
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+//-----------------------------------------------------------------------------
+// Copyright (C) 2014 iZsh <izsh at fail0verflow.com>
+//
+// This code is licensed to you under the terms of the GNU GPL, version 2 or,
+// at your option, any later version. See the LICENSE.txt file for the text of
+// the license.
+//-----------------------------------------------------------------------------
+// testbench for min_max_tracker
+`include "min_max_tracker.v"
+
+`define FIN "tb_tmp/data.filtered.gold"
+`define FOUT_MIN "tb_tmp/data.min"
+`define FOUT_MAX "tb_tmp/data.max"
+
+module min_max_tracker_tb;
+
+       integer fin;
+       integer fout_min, fout_max;
+       integer r;
+
+       reg clk;
+       reg [7:0] adc_d;
+       wire [7:0] min;
+       wire [7:0] max;
+
+       initial
+       begin
+               clk = 0;
+               fin = $fopen(`FIN, "r");
+               if (!fin) begin
+                       $display("ERROR: can't open the data file");
+                       $finish;
+               end
+               fout_min = $fopen(`FOUT_MIN, "w+");             
+               fout_max = $fopen(`FOUT_MAX, "w+");             
+               if (!$feof(fin))
+                       adc_d = $fgetc(fin); // read the first value
+       end
+
+       always
+               # 1 clk = !clk;
+
+       // input
+       initial
+       begin
+               while (!$feof(fin)) begin
+                       @(negedge clk) adc_d <= $fgetc(fin);
+               end
+
+               if ($feof(fin))
+               begin
+                       # 3 $fclose(fin);
+                       $fclose(fout_min);
+                       $fclose(fout_max);
+                       $finish;
+               end
+       end
+
+       initial
+       begin
+               // $monitor("%d\t min: %x, max: %x", $time, min, max);          
+       end
+
+       // output
+       always @(negedge clk)
+       if ($time > 2) begin
+               r = $fputc(min, fout_min);
+               r = $fputc(max, fout_max);
+       end
+
+       // module to test
+       min_max_tracker tracker(clk, adc_d, 8'd127, min, max);
+
+endmodule
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