Using CPLD and VHDL to write a code for a multifunction Calculator

Dr-Chambers

Hey Afternoon people,

Alright, in need of your major help and hoping you allow yourselves to feel good enough to help me.Alright allow me to get to it.

Writing a program code for a multifunction calculator system using a CPLD and VHDL.

The calculator contains:

1 2 3
4 5 6
7 8 9 0

4 additional functions need to be added to the calculator by using '0' as a shift function.

The function +, -, /, x.

So far all the code written up is as follows.Feel good enough to check it and help me add to it, thank you very much.

DEBOUNCING BEHAVIOR
----------------------------------------------------------------------------------
-- Company:
-- Engineer:
--
-- Create Date: 11:35:19 02/01/2009
-- Design Name:
-- Module Name: debounce - Behavioral
-- Project Name:
-- Target Devices:
-- Tool versions:
-- Description:
--
-- Dependencies:
--
-- Revision:
-- Revision 0.01 - File Created
-- Additional Comments:
--
----------------------------------------------------------------------------------
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_ARITH.ALL;
use IEEE.STD_LOGIC_UNSIGNED.ALL;

---- Uncomment the following library declaration if instantiating
---- any Xilinx primitives in this code.
--library UNISIM;
--use UNISIM.VComponents.all;

entity debounce is
Port ( clock : in std_logic;
keyin : in STD_LOGIC_VECTOR (3 downto 0);
keyout : out STD_LOGIC_VECTOR (3 downto 0));
end debounce;

architecture behaviour of debounce is
signal clk: std_logic;

begin

milli_s_period: process(clock)
variable cnt: std_logic_vector (14 downto 0);
begin

if rising_edge(clock) then

cnt := cnt + '1';
--if cnt = "000000000000011" then -- test
if cnt = "110001001010111" then
cnt := "000000000000000";
clk <= '1';
else
clk <= '0';
end if;

end if;
end process;

debounce: process(clk)
begin

if rising_edge(clk) then
keyout <= keyin;
end if;
end process;

end behaviour;


DISPLAYING TEXT

----------------------------------------------------------------------------------
-- Company:
-- Engineer:
--
-- Create Date: 11:23:33 02/01/2009
-- Design Name:
-- Module Name: display - Behavioral
-- Project Name:
-- Target Devices:
-- Tool versions:
-- Description:
--
-- Dependencies:
--
-- Revision:
-- Revision 0.01 - File Created
-- Additional Comments:
--
----------------------------------------------------------------------------------
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_ARITH.ALL;
use IEEE.STD_LOGIC_UNSIGNED.ALL;

---- Uncomment the following library declaration if instantiating
---- any Xilinx primitives in this code.
--library UNISIM;
--use UNISIM.VComponents.all;

entity display is

generic(width :positive := 5);

Port (
input : in STD_LOGIC_VECTOR (3 downto 0);
output : out STD_LOGIC_VECTOR (6 downto 0));
end display;

architecture a of display is

begin

process(input)

begin
-- if rising_edge(clk) then
case input is

when "0000" =>
output<="0000001";
when "0001" =>
output<="1001111";
when "0010" =>
output<="0010010";
when "0011" =>
output<="0000110";
when "0100" =>
output<="1001100";
when "0101" =>
output<="0100100";
when "0110" =>
output<="0100000";
when "0111" =>
output<="0001111";
when "1000" =>
output<="0000000";
when "1001" =>
output<="0000100";
when "1010" =>
output<="0001000";
when "1011" =>
output<="0000111";
when "1100" =>
output<="0110001";
when "1101" =>
output<="1101000";
when "1110" =>
output<="0110000";
when "1111" =>
output<="0111000";
when others=>
output<="0011111";

end case;
-- end if;
end process;

end a;

DISPLAYING TB.VHDL[1]

--------------------------------------------------------------------------------
-- Company:
-- Engineer:
--
-- Create Date: 14:38:01 02/09/2009
-- Design Name:
-- Module Name: L:/calcutator/keypad/display_tb.vhd
-- Project Name: keypad
-- Target Device:
-- Tool versions:
-- Description:
--
-- VHDL Test Bench Created by ISE for module: display
--
-- Dependencies:
--
-- Revision:
-- Revision 0.01 - File Created
-- Additional Comments:
--
-- Notes:
-- This testbench has been automatically generated using types std_logic and
-- std_logic_vector for the ports of the unit under test. Xilinx recommends
-- that these types always be used for the top-level I/O of a design in order
-- to guarantee that the testbench will bind correctly to the post-implementation
-- simulation model.
--------------------------------------------------------------------------------
LIBRARY ieee;
USE ieee.std_logic_1164.ALL;
USE ieee.std_logic_unsigned.all;
USE ieee.numeric_std.ALL;

ENTITY display_tb IS
END display_tb;

ARCHITECTURE behavior OF display_tb IS

-- Component Declaration for the Unit Under Test (UUT)

COMPONENT display
PORT(
input : IN std_logic_vector(3 downto 0);
output : OUT std_logic_vector(6 downto 0)
);
END COMPONENT;


--Inputs
signal input : std_logic_vector(3 downto 0) := (others => '0');

--Outputs
signal output : std_logic_vector(6 downto 0);

BEGIN

-- Instantiate the Unit Under Test (UUT)
uut: display PORT MAP (
input => input,
output => output
);

-- No clocks detected in port list. Replace <clock> below with
-- appropriate port name

constant <clock>_period := 1ns;

<clock>_process :process
begin
<clock> <= '0';
wait for <clock>_period/2;
<clock> <= '1';
wait for <clock>_period/2;
end process;


-- Stimulus process
stim_proc: process
begin
-- hold reset state for 100ms.
wait for 100ms;

wait for <clock>_period*10;

-- insert stimulus here

wait;
end process;

END;

KEYPAD[1]

----------------------------------------------------------------------------------
-- Company:
-- Engineer:
--
-- Create Date: 08:36:44 02/01/2009
-- Design Name:
-- Module Name: keypad - Behavioral
-- Project Name:
-- Target Devices:
-- Tool versions:
-- Description:
--
-- Dependencies:
--
-- Revision:
-- Revision 0.01 - File Created
-- Additional Comments:
--
----------------------------------------------------------------------------------
LIBRARY ieee;
USE ieee.std_logic_1164.all;
USE ieee.std_logic_arith.all;
USE ieee.std_logic_unsigned.all;


ENTITY keypad IS
PORT(
clk : IN STD_LOGIC;
resetn : IN STD_LOGIC;
row : IN STD_LOGIC_VECTOR(3 downto 0);
col : OUT STD_LOGIC_VECTOR(3 downto 0);
keyvalue_registered : OUT STD_LOGIC_VECTOR(3 downto 0);
keyvalid : OUT STD_LOGIC
);
END keypad;

ARCHITECTURE mixed OF keypad IS
TYPE STATE_TYPE IS ( Start_State, DriveAll, KeyDetect,
Delay, Drive1, Detect1, Drive2, Detect2,
Drive3, Detect3, Drive4, Detect4,
Decode1, Decode2, Decode3, Decode4,
Latch0, Latch1, Latch2, Latch3,
Latch4, Latch5, Latch6, Latch7,
Latch8, Latch9, Latch10, Latch11, Latch12,
Latch13, Latch14, Latch15, PrepareDrive,
Capture0, Capture1, Capture2, Capture3, Capture4,
Capture5, Capture6, Capture7, Capture8,
Capture9, Capture10, Capture11,
Capture12, Capture13, Capture14, Capture15,
KeyReleaseAssert, KeyReleaseDetect
);
SIGNAL state: STATE_TYPE;
signal sense: std_logic;
signal count_value: std_logic_vector(3 downto 0);
signal count_resetn: std_logic;
signal keyvalue: std_logic_vector(3 downto 0);
signal register_load: std_logic;
signal register_resetn: std_logic;

BEGIN



sense <= row(0) and row(1) and row(2) and row(3);

-- Moore Machine Next state logic
PROCESS (clk)
BEGIN
IF resetn = '0' THEN
state <= Start_State;
ELSIF clk'EVENT AND clk = '1' THEN
CASE state IS
WHEN Start_State =>
state <= DriveAll;

WHEN DriveAll => -- drive all cols
IF count_value = "1111" THEN
state <= KeyDetect;
END IF;

WHEN KeyDetect => -- determine if any key is pressed. If
-- not, continue driving columns
IF sense = '1' THEN
state <= DriveAll;
elsif sense = '0' then
state <= Delay;
END IF;

WHEN Delay => -- key detected, delay
IF count_value = "1111" THEN
state <= PrepareDrive;
END IF;

when PrepareDrive => -- determine what key was pressed
state <= Drive1;

when Drive1 => -- Is key in column 1
if count_value = "1111" THEN
state <= Detect1;
end if;

when Detect1 =>
if sense = '1' then
state <= Drive2;
elsif sense = '0' then
state <= Decode1;
end if;

when Drive2 => -- Is key in column 2
if count_value = "1111" then
state <= Detect2;
end if;

when Detect2 =>
if sense = '1' then
state <= Drive3;
elsif sense = '0' then
state <= Decode2;
end if;

when Drive3 => -- Is key in column 3
if count_value = "1111" then
state <= Detect3;
end if;

when Detect3 =>
if sense = '1' then
state <= Drive4;
elsif sense = '0' then
state <= Decode3;
end if;

when Drive4 => -- Is key in column 4
if count_value = "1111" then
state <= Detect4;
end if;

when Detect4 =>
if sense = '1' then
state <= Drive1;
elsif sense = '0' then
state <= Decode4;
end if;

when Decode1 => -- Determine which key in column 1 is pressed
if row(0) = '0' then
state <= Latch0;
elsif row(1) = '0' then
state <= Latch4;
elsif row(2) = '0' then
state <= Latch8;
else
state <= Latch12;
end if;

when Decode2 => -- Determine which key in column 2 is pressed
if row(0) = '0' then
state <= Latch1;
elsif row(1) = '0' then
state <= Latch5;
elsif row(2) = '0' then
state <= Latch9;
else
state <= Latch13;
end if;

when Decode3 => -- Determine which key in column 3 is pressed
if row(0) = '0' then
state <= Latch2;
elsif row(1) = '0' then
state <= Latch6;
elsif row(2) = '0' then
state <= Latch10;
else
state <= Latch14;
end if;

when Decode4 => -- Determine which key in column 4 is pressed
if row(0) = '0' then
state <= Latch3;
elsif row(1) = '0' then
state <= Latch7;
elsif row(2) = '0' then
state <= Latch11;
else
state <= Latch15;
end if;

-- states to enable the output register to load the detected key on the
-- next rising edge of the clock
when Latch0 =>
state <= Capture0;

when Latch1 =>
state <= Capture1;

when Latch2 =>
state <= Capture2;

when Latch3 =>
state <= Capture3;

when Latch4 =>
state <= Capture4;

when Latch5 =>
state <= Capture5;

when Latch6 =>
state <= Capture6;

when Latch7 =>
state <= Capture7;

when Latch8 =>
state <= Capture8;

when Latch9 =>
state <= Capture9;

when Latch10 =>
state <= Capture10;

when Latch11 =>
state <= Capture11;

when Latch12 =>
state <= Capture12;

when Latch13 =>
state <= Capture13;

when Latch14 =>
state <= Capture14;

when Latch15 =>
state <= Capture15;

-- states when the detected key value is loaded into output register
when Capture0 =>
state <= KeyReleaseAssert;

when Capture1 =>
state <= KeyReleaseAssert;

when Capture2 =>
state <= KeyReleaseAssert;

when Capture3 =>
state <= KeyReleaseAssert;

when Capture4 =>
state <= KeyReleaseAssert;

when Capture5 =>
state <= KeyReleaseAssert;

when Capture6 =>
state <= KeyReleaseAssert;

when Capture7 =>
state <= KeyReleaseAssert;

when Capture8 =>
state <= KeyReleaseAssert;

when Capture9 =>
state <= KeyReleaseAssert;

when Capture10 =>
state <= KeyReleaseAssert;

when Capture11 =>
state <= KeyReleaseAssert;

when Capture12 =>
state <= KeyReleaseAssert;

when Capture13 =>
state <= KeyReleaseAssert;

when Capture14 =>
state <= KeyReleaseAssert;

when Capture15 =>
state <= KeyReleaseAssert;

-- Wait for user to release the depressed key
when KeyReleaseAssert =>
if count_value = "1111" then
state <= KeyReleaseDetect;
end if;

when KeyReleaseDetect =>
if sense = '1' then
state <= Start_State;
elsif sense = '0' then
state <= KeyReleaseAssert;
end if;


END CASE;
END IF;
END PROCESS;

-- enable the counter reset in the state before the counter is to be used
WITH state SELECT
count_resetn <=
'0' WHEN Start_State,
'0' WHEN KeyDetect,
'0' WHEN PrepareDrive,
'0' when Detect1,
'0' when Detect2,
'0' when Detect3,
'0' when Detect4,
'0' when Capture0,
'0' when Capture1,
'0' when Capture2,
'0' when Capture3,
'0' when Capture4,
'0' when Capture5,
'0' when Capture6,
'0' when Capture7,
'0' when Capture8,
'0' when Capture9,
'0' when Capture10,
'0' when Capture11,
'0' when Capture12,
'0' when Capture13,
'0' when Capture14,
'0' when Capture15,
'0' when KeyReleaseDetect,
'1' when others;

-- assert the register load signal in the state before the keyvalue is to be
-- latched into the output register
with state select
register_load <=
'1' when latch0,
'1' when latch1,
'1' when latch2,
'1' when latch3,
'1' when latch4,
'1' when latch5,
'1' when latch6,
'1' when latch7,
'1' when latch8,
'1' when latch9,
'1' when latch10,
'1' when latch11,
'1' when latch12,
'1' when latch13,
'1' when latch14,
'1' when latch15,
'1' when capture0,
'1' when capture1,
'1' when capture2,
'1' when capture3,
'1' when capture4,
'1' when capture5,
'1' when capture6,
'1' when capture7,
'1' when capture8,
'1' when capture9,
'1' when capture10,
'1' when capture11,
'1' when capture12,
'1' when capture13,
'1' when capture14,
'1' when capture15,
'0' when others;

-- outputs to determine which columns to drive during keyscanning phase
with state select
col <=
"0111" when Drive1,
"0111" when Detect1,
"0111" when Decode1,
"1011" when Drive2,
"1011" when Detect2,
"1011" when Decode2,
"1101" when Drive3,
"1101" when Detect3,
"1101" when Decode3,
"1110" when Drive4,
"1110" when Detect4,
"1110" when Decode4,
"0000" when others; -- including DriveAll and KeyReleaseAssert

-- the value of the detected key in binary
with state select
keyvalue <=
"0000" when Latch0,
"0000" when Capture0,
"0001" when Latch1,
"0001" when Capture1,
"0010" when Latch2,
"0010" when Capture2,
"0011" when Latch3,
"0011" when Capture3,
"0100" when Latch4,
"0100" when Capture4,
"0101" when Latch5,
"0101" when Capture5,
"0110" when Latch6,
"0110" when Capture6,
"0111" when Latch7,
"0111" when Capture7,
"1000" when Latch8,
"1000" when Capture8,
"1001" when Latch9,
"1001" when Capture9,
"1010" when Latch10,
"1010" when Capture10,
"1011" when Latch11,
"1011" when Capture11,
"1100" when Latch12,
"1100" when Capture12,
"1101" when Latch13,
"1101" when Capture13,
"1110" when Latch14,
"1110" when Capture14,
"1111" when Latch15,
"1111" when Capture15,
"0000" when others;

-- assert the keyvalid flag when a valid key is detected
with state select
keyvalid <=
'1' when Capture0,
'1' when Capture1,
'1' when Capture2,
'1' when Capture3,
'1' when Capture4,
'1' when Capture5,
'1' when Capture6,
'1' when Capture7,
'1' when Capture8,
'1' when Capture9,
'1' when Capture10,
'1' when Capture11,
'1' when Capture12,
'1' when Capture13,
'1' when Capture14,
'1' when Capture15,
'0' when others;

END mixed;

KEYPAD TB.VHDL[1]

--------------------------------------------------------------------------------
-- Company:
-- Engineer:
--
-- Create Date: 13:49:31 02/10/2009
-- Design Name:
-- Module Name: L:/calcutator/keypad/keypad_tb.vhd
-- Project Name: keypad
-- Target Device:
-- Tool versions:
-- Description:
--
-- VHDL Test Bench Created by ISE for module: keypad
--
-- Dependencies:
--
-- Revision:
-- Revision 0.01 - File Created
-- Additional Comments:
--
-- Notes:
-- This testbench has been automatically generated using types std_logic and
-- std_logic_vector for the ports of the unit under test. Xilinx recommends
-- that these types always be used for the top-level I/O of a design in order
-- to guarantee that the testbench will bind correctly to the post-implementation
-- simulation model.
--------------------------------------------------------------------------------
LIBRARY ieee;
USE ieee.std_logic_1164.ALL;
USE ieee.std_logic_unsigned.all;
USE ieee.numeric_std.ALL;

ENTITY keypad_tb IS
END keypad_tb;

ARCHITECTURE behavior OF keypad_tb IS

-- Component Declaration for the Unit Under Test (UUT)

COMPONENT keypad
PORT(
clk : IN std_logic;
resetn : IN std_logic;
row : IN std_logic_vector(3 downto 0);
col : OUT std_logic_vector(3 downto 0);
keyvalue_registered : OUT std_logic_vector(3 downto 0);
keyvalid : OUT std_logic
);
END COMPONENT;


--Inputs
signal clk : std_logic := '0';
signal resetn : std_logic := '0';
signal row : std_logic_vector(3 downto 0) := (others => '0');

--Outputs
signal col : std_logic_vector(3 downto 0);
signal keyvalue_registered : std_logic_vector(3 downto 0);
signal keyvalid : std_logic;

-- Clock period definitions
constant clk_period : time := 1us;

BEGIN

-- Instantiate the Unit Under Test (UUT)
uut: keypad PORT MAP (
clk => clk,
resetn => resetn,
row => row,
col => col,
keyvalue_registered => keyvalue_registered,
keyvalid => keyvalid
);

-- Clock process definitions
clk_process :process
begin
clk <= '0';
wait for clk_period/2;
clk <= '1';
wait for clk_period/2;
end process;


-- Stimulus process
stim_proc: process
begin
-- hold reset state for 100ms.
wait for 100ms;

wait for clk_period*10;

-- insert stimulus here

wait;
end process;

END;