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[/] [usb_dongle_fpga/] [tags/] [HWVersion_1_0/] [src/] [led_sys/] [led_coder.vhd] - Rev 53
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------------------------------------------------------------------ -- Universal dongle board source code -- -- Copyright (C) 2006 Artec Design <jyrit@artecdesign.ee> -- -- This source code is free hardware; you can redistribute it and/or -- modify it under the terms of the GNU Lesser General Public -- License as published by the Free Software Foundation; either -- version 2.1 of the License, or (at your option) any later version. -- -- This source code is distributed in the hope that it will be useful, -- but WITHOUT ANY WARRANTY; without even the implied warranty of -- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU -- Lesser General Public License for more details. -- -- You should have received a copy of the GNU Lesser General Public -- License along with this library; if not, write to the Free Software -- Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA -- -- -- The complete text of the GNU Lesser General Public License can be found in -- the file 'lesser.txt'. -- bit 0,A -- ---------- -- | | -- | | -- 5,F| | 1,B -- | 6,G | -- ---------- -- | | -- | | -- 4,E| | 2,C -- | 3,D | -- ---------- -- # 7,H library ieee; use ieee.std_logic_1164.all; use IEEE.std_logic_unsigned.all; use IEEE.std_logic_arith.all; entity led_coder is port ( led_data_i : in std_logic_vector(7 downto 0); hi_seg : out std_logic_vector(7 downto 0); lo_seg : out std_logic_vector(7 downto 0) ); end led_coder; architecture rtl of led_coder is signal r_led_data : std_logic_vector(7 downto 0); signal decoded_lo,decoded_hi : std_logic_vector(7 downto 0); begin -- rtl hi_seg <= decoded_hi; lo_seg <= decoded_lo; -- purpose: binary to led segments decoder -- type : combinational -- inputs : nibble,reset -- outputs: decode_nibble_lo: process (led_data_i) begin -- process decode_nibble case led_data_i(3 downto 0) is--HGFEDCBA when "0000" => decoded_lo <= "00111111"; -- 0 when "0001" => decoded_lo <= "00000110"; -- 1 when "0010" => decoded_lo <= "01011011"; -- 2 when "0011" => decoded_lo <= "01001111"; -- 3 when "0100" => decoded_lo <= "01100110"; -- 4 when "0101" => decoded_lo <= "01101101"; -- 5 when "0110" => decoded_lo <= "01111101"; -- 6 when "0111" => decoded_lo <= "00000111"; -- 7 when "1000" => decoded_lo <= "01111111"; -- 8 when "1001" => decoded_lo <= "01101111"; -- 9 when "1010" => decoded_lo <= "01110111"; -- a when "1011" => decoded_lo <= "01111100"; -- b when "1100" => decoded_lo <= "00111001"; -- c when "1101" => decoded_lo <= "01011110"; -- d when "1110" => decoded_lo <= "01111001"; -- e when others => decoded_lo <= "01110001"; -- f end case; end process decode_nibble_lo; decode_nibble_hi: process (led_data_i) begin -- process decode_nibble case led_data_i(7 downto 4) is--HGFEDCBA when "0000" => decoded_hi <= "00111111"; -- 0 when "0001" => decoded_hi <= "00000110"; -- 1 when "0010" => decoded_hi <= "01011011"; -- 2 when "0011" => decoded_hi <= "01001111"; -- 3 when "0100" => decoded_hi <= "01100110"; -- 4 when "0101" => decoded_hi <= "01101101"; -- 5 when "0110" => decoded_hi <= "01111101"; -- 6 when "0111" => decoded_hi <= "00000111"; -- 7 when "1000" => decoded_hi <= "01111111"; -- 8 when "1001" => decoded_hi <= "01101111"; -- 9 when "1010" => decoded_hi <= "01110111"; -- a when "1011" => decoded_hi <= "01111100"; -- b when "1100" => decoded_hi <= "00111001"; -- c when "1101" => decoded_hi <= "01011110"; -- d when "1110" => decoded_hi <= "01111001"; -- e when others => decoded_hi <= "01110001"; -- f end case; end process decode_nibble_hi; end rtl;