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///////////////////////////////////////////////////////////////////////////

//

// Filename:    hexmap.v

//              

// Project:     A Real--time Clock Core

//

// Purpose:     Converts a 4'bit hexadecimal value to the seven bits needed

//              by a seven segment display, specifying which bits are on and

//              which are off.

//

//              The display I am working with, however, requires a separate

//              controller.  This file only provides part of the input for that

//              controller.  That controller deals with turning on each part

//              of the display in a rotating fashion, since the hardware I have

//              cannot display more than one character at a time.  So,

//              buyer beware--this is not a complete seven segment display

//              solution.

//

//

//              The outputs of this routine are numbered as follows:

//                      o_map[7] turns on the bar at the top of the display

//                      o_map[6] turns on the top of the '1'

//                      o_map[5] turns on the bottom of a '1'

//                      o_map[4] turns on the bar at the bottom of the display

//                      o_map[3] turns on the vertical bar at the bottom left

//                      o_map[2] turns on the vertical bar at the top left, and

//                      o_map[1] turns on the bar in the middle of the display.

//                              The dash if you will.

//              Bit zero, from elsewhere, would be the decimal point.

//

// Creator:     Dan Gisselquist, Ph.D.

//              Gisselquist Tecnology, LLC

//

///////////////////////////////////////////////////////////////////////////

//

// Copyright (C) 2015, Gisselquist Technology, LLC

//

// This program is free software (firmware): you can redistribute it and/or

// modify it under the terms of  the GNU General Public License as published

// by the Free Software Foundation, either version 3 of the License, or (at

// your option) any later version.

//

// This program is distributed in the hope that it will be useful, but WITHOUT

// ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY or

// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

// for more details.

//

// You should have received a copy of the GNU General Public License along

// with this program.  (It's in the $(ROOT)/doc directory.  Run make with no

// target there if the PDF file isn't present.)  If not, see

// <http://www.gnu.org/licenses/> for a copy.

//

// License:     GPL, v3, as defined and found on www.gnu.org,

//              http://www.gnu.org/licenses/gpl.html

//

//

///////////////////////////////////////////////////////////////////////////

module  hexmap(i_clk, i_hex, o_map);

        input           i_clk;

        input   [3:0]    i_hex;

        output  reg     [7:1]   o_map;

        always @(posedge i_clk)

                case(i_hex)

                4'h0:   o_map <= { 7'b1111110 };

                4'h1:   o_map <= { 7'b0110000 };

                4'h2:   o_map <= { 7'b1101101 };

                4'h3:   o_map <= { 7'b1111001 };

                4'h4:   o_map <= { 7'b0110011 };

                4'h5:   o_map <= { 7'b1011011 };

                4'h6:   o_map <= { 7'b1011111 };

                4'h7:   o_map <= { 7'b1110000 };

                4'h8:   o_map <= { 7'b1111111 };

                4'h9:   o_map <= { 7'b1111011 };

                4'ha:   o_map <= { 7'b1110111 };

                4'hb:   o_map <= { 7'b0011111 }; // b

                4'hc:   o_map <= { 7'b1001110 };

                4'hd:   o_map <= { 7'b0111101 }; // d

                4'he:   o_map <= { 7'b1001111 };

                4'hf:   o_map <= { 7'b1000111 };

                endcase

endmodule