--- /dev/null
+//-----------------------------------------------------------------------------
+// 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 lf_edge_detect
+`include "lf_edge_detect.v"
+
+`define FIN "tb_tmp/data.filtered.gold"
+`define FOUT_MIN "tb_tmp/data.min"
+`define FOUT_MAX "tb_tmp/data.max"
+`define FOUT_STATE "tb_tmp/data.state"
+`define FOUT_TOGGLE "tb_tmp/data.toggle"
+`define FOUT_HIGH "tb_tmp/data.high"
+`define FOUT_HIGHZ "tb_tmp/data.highz"
+`define FOUT_LOWZ "tb_tmp/data.lowz"
+`define FOUT_LOW "tb_tmp/data.low"
+
+module lf_edge_detect_tb;
+
+ integer fin, fout_state, fout_toggle;
+ integer fout_high, fout_highz, fout_lowz, fout_low, fout_min, fout_max;
+ integer r;
+
+ reg clk = 0;
+ reg [7:0] adc_d;
+ wire adc_clk;
+ wire data_rdy;
+ wire edge_state;
+ wire edge_toggle;
+
+ wire [7:0] high_threshold;
+ wire [7:0] highz_threshold;
+ wire [7:0] lowz_threshold;
+ wire [7:0] low_threshold;
+ wire [7:0] max;
+ wire [7:0] min;
+
+ 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+");
+ fout_state = $fopen(`FOUT_STATE, "w+");
+ fout_toggle = $fopen(`FOUT_TOGGLE, "w+");
+ fout_high = $fopen(`FOUT_HIGH, "w+");
+ fout_highz = $fopen(`FOUT_HIGHZ, "w+");
+ fout_lowz = $fopen(`FOUT_LOWZ, "w+");
+ fout_low = $fopen(`FOUT_LOW, "w+");
+ if (!$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_state);
+ $fclose(fout_toggle);
+ $fclose(fout_high);
+ $fclose(fout_highz);
+ $fclose(fout_lowz);
+ $fclose(fout_low);
+ $fclose(fout_min);
+ $fclose(fout_max);
+ $finish;
+ end
+ end
+
+ initial
+ begin
+ // $monitor("%d\t S: %b, E: %b", $time, edge_state, edge_toggle);
+ end
+
+ // output
+ always @(negedge clk)
+ if ($time > 2) begin
+ r = $fputc(min, fout_min);
+ r = $fputc(max, fout_max);
+ r = $fputc(edge_state, fout_state);
+ r = $fputc(edge_toggle, fout_toggle);
+ r = $fputc(high_threshold, fout_high);
+ r = $fputc(highz_threshold, fout_highz);
+ r = $fputc(lowz_threshold, fout_lowz);
+ r = $fputc(low_threshold, fout_low);
+ end
+
+ // module to test
+ lf_edge_detect detect(clk, adc_d, 8'd127,
+ max, min,
+ high_threshold, highz_threshold,
+ lowz_threshold, low_threshold,
+ edge_state, edge_toggle);
+
+endmodule
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