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nuubik |
------------------------------------------------------------------
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-- Universal dongle board source code
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--
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-- Copyright (C) 2006 Artec Design <jyrit@artecdesign.ee>
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--
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-- This source code is free hardware; you can redistribute it and/or
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-- modify it under the terms of the GNU Lesser General Public
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-- License as published by the Free Software Foundation; either
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-- version 2.1 of the License, or (at your option) any later version.
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--
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-- This source code is distributed in the hope that it will be useful,
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-- but WITHOUT ANY WARRANTY; without even the implied warranty of
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-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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-- Lesser General Public License for more details.
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--
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-- You should have received a copy of the GNU Lesser General Public
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-- License along with this library; if not, write to the Free Software
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-- Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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--
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--
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-- The complete text of the GNU Lesser General Public License can be found in
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-- the file 'lesser.txt'.
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-- bit 0,A
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-- ----------
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-- | |
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-- | |
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-- 5,F| | 1,B
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-- | 6,G |
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-- ----------
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-- | |
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-- | |
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-- 4,E| | 2,C
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-- | 3,D |
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-- ----------
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-- # 7,H
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library ieee;
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use ieee.std_logic_1164.all;
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use IEEE.std_logic_unsigned.all;
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use IEEE.std_logic_arith.all;
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entity led_coder is
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port (
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led_data_i : in std_logic_vector(7 downto 0);
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hi_seg : out std_logic_vector(7 downto 0);
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lo_seg : out std_logic_vector(7 downto 0)
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);
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end led_coder;
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architecture rtl of led_coder is
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signal r_led_data : std_logic_vector(7 downto 0);
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signal decoded_lo,decoded_hi : std_logic_vector(7 downto 0);
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begin -- rtl
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hi_seg <= not decoded_hi;
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lo_seg <= not decoded_lo;
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-- purpose: binary to led segments decoder
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-- type : combinational
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-- inputs : nibble,reset
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-- outputs:
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decode_nibble_lo: process (led_data_i)
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begin -- process decode_nibble
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case led_data_i(3 downto 0) is--HGFEDCBA
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when "0000" => decoded_lo <= "00111111"; -- 0
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when "0001" => decoded_lo <= "00000110"; -- 1
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when "0010" => decoded_lo <= "01011011"; -- 2
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when "0011" => decoded_lo <= "01001111"; -- 3
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when "0100" => decoded_lo <= "01100110"; -- 4
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when "0101" => decoded_lo <= "01101101"; -- 5
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when "0110" => decoded_lo <= "01111101"; -- 6
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when "0111" => decoded_lo <= "00000111"; -- 7
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when "1000" => decoded_lo <= "01111111"; -- 8
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when "1001" => decoded_lo <= "01101111"; -- 9
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when "1010" => decoded_lo <= "01110111"; -- a
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when "1011" => decoded_lo <= "01111100"; -- b
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when "1100" => decoded_lo <= "00111001"; -- c
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when "1101" => decoded_lo <= "01011110"; -- d
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when "1110" => decoded_lo <= "01111001"; -- e
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when others => decoded_lo <= "01110001"; -- f
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end case;
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end process decode_nibble_lo;
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decode_nibble_hi: process (led_data_i)
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begin -- process decode_nibble
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case led_data_i(7 downto 4) is--HGFEDCBA
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when "0000" => decoded_hi <= "00111111"; -- 0
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when "0001" => decoded_hi <= "00000110"; -- 1
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when "0010" => decoded_hi <= "01011011"; -- 2
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when "0011" => decoded_hi <= "01001111"; -- 3
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when "0100" => decoded_hi <= "01100110"; -- 4
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when "0101" => decoded_hi <= "01101101"; -- 5
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when "0110" => decoded_hi <= "01111101"; -- 6
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when "0111" => decoded_hi <= "00000111"; -- 7
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when "1000" => decoded_hi <= "01111111"; -- 8
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when "1001" => decoded_hi <= "01101111"; -- 9
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when "1010" => decoded_hi <= "01110111"; -- a
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when "1011" => decoded_hi <= "01111100"; -- b
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when "1100" => decoded_hi <= "00111001"; -- c
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when "1101" => decoded_hi <= "01011110"; -- d
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when "1110" => decoded_hi <= "01111001"; -- e
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when others => decoded_hi <= "01110001"; -- f
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end case;
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end process decode_nibble_hi;
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end rtl;
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