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https://opencores.org/ocsvn/rtcclock/rtcclock/trunk
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[/] [rtcclock/] [trunk/] [rtl/] [hexmap.v] - Rev 4
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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
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