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Decoder.vhd
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library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_ARITH.ALL;
use IEEE.STD_LOGIC_UNSIGNED.ALL;
use work.Common.all;
entity Decoder is
Port (
clk: in STD_LOGIC;
Row: in STD_LOGIC_VECTOR (3 downto 0);
globalState: globalStateList;
selectDigit: in STD_LOGIC_VECTOR(3 downto 0);
lockButton: in STD_LOGIC;
Col: out STD_LOGIC_VECTOR (3 downto 0);
DecodeOut: out STD_LOGIC_VECTOR (15 downto 0));
end Decoder;
architecture Behavioral of Decoder is
signal sclk: STD_LOGIC_VECTOR(19 downto 0);
signal digit1, digit2, digit3, digit4: STD_LOGIC_VECTOR(3 downto 0);
type statesList is (dgt1, dgt2, dgt3, dgt4, full);
signal state: statesList;
begin
process(CLK, selectDigit, state)
begin
if(CLK='1' and CLK'event) then
case selectDigit is
when "0000" =>
state <= full;
when "0001" =>
state <= dgt1;
when "0010" =>
state <= dgt2;
when "0100" =>
state <= dgt3;
when "1000" =>
state <= dgt4;
when others => NULL;
end case;
end if;
end process;
process(clk)
begin
if(CLK='1' and CLK'event) then
if (globalState = locked AND lockButton = '1') then --Reset display when locking safe
digit1 <= "0000";
digit2 <= "0000";
digit3 <= "0000";
digit4 <= "0000";
end if;
if sclk = "00011000011010100000" then
--C1
Col<= "0111";
sclk <= sclk+1;
-- check row pins
elsif sclk = "00011000011010101000" then
--R1
if Row = "0111" then
case state is
when dgt1 =>
digit1 <= "0001"; --1
when dgt2 =>
digit2 <= "0001";
when dgt3 =>
digit3 <= "0001";
when dgt4 =>
digit4 <= "0001";
when full =>
NULL;
end case;
--R2
elsif Row = "1011" then
case state is
when dgt1 =>
digit1 <= "0100"; --4
when dgt2 =>
digit2 <= "0100";
when dgt3 =>
digit3 <= "0100";
when dgt4 =>
digit4 <= "0100";
when full =>
NULL;
end case;
--R3
elsif Row = "1101" then
case state is
when dgt1 =>
digit1 <= "0111"; --7
when dgt2 =>
digit2 <= "0111";
when dgt3 =>
digit3 <= "0111";
when dgt4 =>
digit4 <= "0111";
when full =>
NULL;
end case;
--R4
elsif Row = "1110" then
case state is
when dgt1 =>
digit1 <= "0000"; --0
when dgt2 =>
digit2 <= "0000";
when dgt3 =>
digit3 <= "0000";
when dgt4 =>
digit4 <= "0000";
when full =>
NULL;
end case;
end if;
sclk <= sclk+1;
-- 2ms
elsif sclk = "00110000110101000000" then
--C2
Col<= "1011";
sclk <= sclk+1;
-- check row pins
elsif sclk = "00110000110101001000" then
--R1
if Row = "0111" then
case state is
when dgt1 =>
digit1 <= "0010"; --2
when dgt2 =>
digit2 <= "0010";
when dgt3 =>
digit3 <= "0010";
when dgt4 =>
digit4 <= "0010";
when full =>
NULL;
end case;
--R2
elsif Row = "1011" then
case state is
when dgt1 =>
digit1 <= "0101"; --5
when dgt2 =>
digit2 <= "0101";
when dgt3 =>
digit3 <= "0101";
when dgt4 =>
digit4 <= "0101";
when full =>
NULL;
end case;
--R3
elsif Row = "1101" then
case state is
when dgt1 =>
digit1 <= "1000"; --8
when dgt2 =>
digit2 <= "1000";
when dgt3 =>
digit3 <= "1000";
when dgt4 =>
digit4 <= "1000";
when full =>
NULL;
end case;
--R4
elsif Row = "1110" then
case state is
when dgt1 =>
digit1 <= "1111"; --F
when dgt2 =>
digit2 <= "1111";
when dgt3 =>
digit3 <= "1111";
when dgt4 =>
digit4 <= "1111";
when full =>
NULL;
end case;
end if;
sclk <= sclk+1;
--3ms
elsif sclk = "01001001001111100000" then
--C3
Col<= "1101";
sclk <= sclk+1;
-- check row pins
elsif sclk = "01001001001111101000" then
--R1
if Row = "0111" then
case state is
when dgt1 =>
digit1 <= "0011"; --3
when dgt2 =>
digit2 <= "0011";
when dgt3 =>
digit3 <= "0011";
when dgt4 =>
digit4 <= "0011";
when full =>
NULL;
end case;
--R2
elsif Row = "1011" then
case state is
when dgt1 =>
digit1 <= "0110"; --6
when dgt2 =>
digit2 <= "0110";
when dgt3 =>
digit3 <= "0110";
when dgt4 =>
digit4 <= "0110";
when full =>
NULL;
end case;
--R3
elsif Row = "1101" then
case state is
when dgt1 =>
digit1 <= "1001"; --9
when dgt2 =>
digit2 <= "1001";
when dgt3 =>
digit3 <= "1001";
when dgt4 =>
digit4 <= "1001";
when full =>
NULL;
end case;
--R4
elsif Row = "1110" then
case state is
when dgt1 =>
digit1 <= "1110"; --E
when dgt2 =>
digit2 <= "1110";
when dgt3 =>
digit3 <= "1110";
when dgt4 =>
digit4 <= "1110";
when full =>
NULL;
end case;
end if;
sclk <= sclk+1;
--4ms
elsif sclk = "01100001101010000000" then
--C4
Col<= "1110";
sclk <= sclk+1;
-- check row pins
elsif sclk = "01100001101010001000" then
--R1
if Row = "0111" then
case state is
when dgt1 =>
digit1 <= "1010"; --A
when dgt2 =>
digit2 <= "1010";
when dgt3 =>
digit3 <= "1010";
when dgt4 =>
digit4 <= "1010";
when full =>
NULL;
end case;
--R2
elsif Row = "1011" then
case state is
when dgt1 =>
digit1 <= "1011"; --B
when dgt2 =>
digit2 <= "1011";
when dgt3 =>
digit3 <= "1011";
when dgt4 =>
digit4 <= "1011";
when full =>
NULL;
end case;
--R3
elsif Row = "1101" then
case state is
when dgt1 =>
digit1 <= "1100"; --C
when dgt2 =>
digit2 <= "1100";
when dgt3 =>
digit3 <= "1100";
when dgt4 =>
digit4 <= "1100";
when full =>
NULL;
end case;
--R4
elsif Row = "1110" then
case state is
when dgt1 =>
digit1 <= "1101"; --D
when dgt2 =>
digit2 <= "1101";
when dgt3 =>
digit3 <= "1101";
when dgt4 =>
digit4 <= "1101";
when full =>
NULL;
end case;
end if;
sclk <= "00000000000000000000";
else
sclk <= sclk+1;
end if;
end if;
end process;
process
begin
wait on digit1;
DecodeOut <= "0000"&"0000"&"0000"&digit1;
wait on digit2;
DecodeOut <= "0000"&"0000"&digit2&digit1;
wait on digit3;
DecodeOut <= "0000"&digit3&digit2&digit1;
wait on digit4;
DecodeOut <= digit4&digit3&digit2&digit1;
end process;
end Behavioral;