revert removal of quarter frequency support for hi_read_rx_xcorr.v

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

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