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[/] [rtcclock/] [trunk/] [rtl/] [hexmap.v] - Blame information for rev 3

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1 2 dgisselq
///////////////////////////////////////////////////////////////////////////
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//
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// Filename:    hexmap.v
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//              
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// Project:     A Real--time Clock Core
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//
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// Purpose:     Converts a 4'bit hexadecimal value to the seven bits needed
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//              by a seven segment display, specifying which bits are on and
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//              which are off.
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//
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//              The display I am working with, however, requires a separate
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//              controller.  This file only provides part of the input for that
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//              controller.  That controller deals with turning on each part
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//              of the display in a rotating fashion, since the hardware I have
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//              cannot display more than one character at a time.  So,
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//              buyer beware--this is not a complete seven segment display
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//              solution.
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//
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//
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//              The outputs of this routine are numbered as follows:
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//                      o_map[7] turns on the bar at the top of the display
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//                      o_map[6] turns on the top of the '1'
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//                      o_map[5] turns on the bottom of a '1'
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//                      o_map[4] turns on the bar at the bottom of the display
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//                      o_map[3] turns on the vertical bar at the bottom left
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//                      o_map[2] turns on the vertical bar at the top left, and
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//                      o_map[1] turns on the bar in the middle of the display.
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//                              The dash if you will.
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//              Bit zero, from elsewhere, would be the decimal point.
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//
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// Creator:     Dan Gisselquist, Ph.D.
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//              Gisselquist Tecnology, LLC
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//
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///////////////////////////////////////////////////////////////////////////
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//
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// Copyright (C) 2015, Gisselquist Technology, LLC
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//
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// This program is free software (firmware): you can redistribute it and/or
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// modify it under the terms of  the GNU General Public License as published
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// by the Free Software Foundation, either version 3 of the License, or (at
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// your option) any later version.
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//
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// This program is distributed in the hope that it will be useful, but WITHOUT
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// ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY or
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// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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// for more details.
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//
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// You should have received a copy of the GNU General Public License along
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// with this program.  (It's in the $(ROOT)/doc directory.  Run make with no
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// target there if the PDF file isn't present.)  If not, see
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// <http://www.gnu.org/licenses/> for a copy.
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//
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// License:     GPL, v3, as defined and found on www.gnu.org,
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//              http://www.gnu.org/licenses/gpl.html
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//
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//
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///////////////////////////////////////////////////////////////////////////
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module  hexmap(i_clk, i_hex, o_map);
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        input           i_clk;
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        input   [3:0]    i_hex;
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        output  reg     [7:1]   o_map;
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        always @(posedge i_clk)
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                case(i_hex)
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                4'h0:   o_map <= { 7'b1111110 };
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                4'h1:   o_map <= { 7'b0110000 };
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                4'h2:   o_map <= { 7'b1101101 };
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                4'h3:   o_map <= { 7'b1111001 };
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                4'h4:   o_map <= { 7'b0110011 };
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                4'h5:   o_map <= { 7'b1011011 };
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                4'h6:   o_map <= { 7'b1011111 };
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                4'h7:   o_map <= { 7'b1110000 };
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                4'h8:   o_map <= { 7'b1111111 };
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                4'h9:   o_map <= { 7'b1111011 };
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                4'ha:   o_map <= { 7'b1110111 };
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                4'hb:   o_map <= { 7'b0011111 }; // b
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                4'hc:   o_map <= { 7'b1001110 };
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                4'hd:   o_map <= { 7'b0111101 }; // d
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                4'he:   o_map <= { 7'b1001111 };
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                4'hf:   o_map <= { 7'b1000111 };
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                endcase
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endmodule

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