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fsm.vhd
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fsm.vhd
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-- fsm.vhd: Finite State Machine
-- Author(s): Marek Marusic, FIT-VUT, 6.5.2014
--
library ieee;
use ieee.std_logic_1164.all;
-- ----------------------------------------------------------------------------
-- Entity declaration
-- ----------------------------------------------------------------------------
entity fsm is
port(
CLK : in std_logic;
RESET : in std_logic;
-- Input signals
KEY : in std_logic_vector(15 downto 0);
CNT_OF : in std_logic;
-- Output signals
FSM_CNT_CE : out std_logic;
FSM_MX_MEM : out std_logic;
FSM_MX_LCD : out std_logic;
FSM_LCD_WR : out std_logic;
FSM_LCD_CLR : out std_logic
);
end entity fsm;
-- ----------------------------------------------------------------------------
-- Architecture declaration
-- ----------------------------------------------------------------------------
architecture behavioral of fsm is
type t_state is (TEST_ENT,TEST1, TESTAB, TESTA3, TESTA4, TESTA5, TESTA6, TESTA7, TESTA8, TESTA9, TESTB3, TESTB4, TESTB5, TESTB6, TESTB7, TESTB8, TESTB9, TESTB10, FAIL, PRINT_MESSAGE_OK, PRINT_MESSAGE_ERR, FINISH);
signal present_state, next_state : t_state;
begin
-- -------------------------------------------------------
sync_logic : process(RESET, CLK)
begin
if (RESET = '1') then
present_state <= TEST1;
elsif (CLK'event AND CLK = '1') then
present_state <= next_state;
end if;
end process sync_logic;
-- -------------------------------------------------------
next_state_logic : process(present_state, KEY, CNT_OF)
begin
case (present_state) is
-- - - - - - - - - - - - - - - - - - - - - - -
when TEST1 =>
next_state <= TEST1;
if (KEY(9) = '1') then
next_state <= TESTAB;
elsif (KEY(15) = '1') then
next_state <= PRINT_MESSAGE_ERR;
elsif (KEY(15 downto 0) /= "0000000000000000") then
next_state <= FAIL;
end if;
-- - - - - - - - - - - - - - - - - - - - - - -
when TESTAB =>
next_state <= TESTAB;
if (KEY(4) = '1') then
next_state <= TESTA3;
elsif (KEY(5) = '1') then
next_state <= TESTB3;
elsif (KEY(15) = '1') then
next_state <= PRINT_MESSAGE_ERR;
elsif (KEY(15 downto 0) /= "0000000000000000") then
next_state <= FAIL;
end if;
-- - - - - - - - - - - - - - - - - - - - - - -
when TESTA3 =>
next_state <= TESTA3;
if (KEY(7) = '1') then
next_state <= TESTA4;
elsif (KEY(15) = '1') then
next_state <= PRINT_MESSAGE_ERR;
elsif (KEY(15 downto 0) /= "0000000000000000") then
next_state <= FAIL;
end if;
-- - - - - - - - - - - - - - - - - - - - - - -
when TESTB3 =>
next_state <= TESTB3;
if (KEY(1) = '1') then
next_state <= TESTB4;
elsif (KEY(15) = '1') then
next_state <= PRINT_MESSAGE_ERR;
elsif (KEY(15 downto 0) /= "0000000000000000") then
next_state <= FAIL;
end if;
-- - - - - - - - - - - - - - - - - - - - - - -
when TESTA4 =>
next_state <= TESTA4;
if (KEY(5) = '1') then
next_state <= TESTA5;
elsif (KEY(15) = '1') then
next_state <= PRINT_MESSAGE_ERR;
elsif (KEY(15 downto 0) /= "0000000000000000") then
next_state <= FAIL;
end if;
-- - - - - - - - - - - - - - - - - - - - - - -
when TESTB4 =>
next_state <= TESTB4;
if (KEY(6) = '1') then
next_state <= TESTB5;
elsif (KEY(15) = '1') then
next_state <= PRINT_MESSAGE_ERR;
elsif (KEY(15 downto 0) /= "0000000000000000") then
next_state <= FAIL;
end if;
-- - - - - - - - - - - - - - - - - - - - - - -
when TESTA5 =>
next_state <= TESTA5;
if (KEY(7) = '1') then
next_state <= TESTA6;
elsif (KEY(15) = '1') then
next_state <= PRINT_MESSAGE_ERR;
elsif (KEY(15 downto 0) /= "0000000000000000") then
next_state <= FAIL;
end if;
-- - - - - - - - - - - - - - - - - - - - - - -
when TESTB5 =>
next_state <= TESTB5;
if (KEY(1) = '1') then
next_state <= TESTB6;
elsif (KEY(15) = '1') then
next_state <= PRINT_MESSAGE_ERR;
elsif (KEY(15 downto 0) /= "0000000000000000") then
next_state <= FAIL;
end if;
-- - - - - - - - - - - - - - - - - - - - - - -
when TESTA6 =>
next_state <= TESTA6;
if (KEY(0) = '1') then
next_state <= TESTA7;
elsif (KEY(15) = '1') then
next_state <= PRINT_MESSAGE_ERR;
elsif (KEY(15 downto 0) /= "0000000000000000") then
next_state <= FAIL;
end if;
-- - - - - - - - - - - - - - - - - - - - - - -
when TESTB6 =>
next_state <= TESTB6;
if (KEY(1) = '1') then
next_state <= TESTB7;
elsif (KEY(15) = '1') then
next_state <= PRINT_MESSAGE_ERR;
elsif (KEY(15 downto 0) /= "0000000000000000") then
next_state <= FAIL;
end if;
-- - - - - - - - - - - - - - - - - - - - - - -
when TESTA7 =>
next_state <= TESTA7;
if (KEY(8) = '1') then
next_state <= TESTA8;
elsif (KEY(15) = '1') then
next_state <= PRINT_MESSAGE_ERR;
elsif (KEY(15 downto 0) /= "0000000000000000") then
next_state <= FAIL;
end if;
-- - - - - - - - - - - - - - - - - - - - - - -
when TESTB7 =>
next_state <= TESTB7;
if (KEY(3) = '1') then
next_state <= TESTB8;
elsif (KEY(15) = '1') then
next_state <= PRINT_MESSAGE_ERR;
elsif (KEY(15 downto 0) /= "0000000000000000") then
next_state <= FAIL;
end if;
-- - - - - - - - - - - - - - - - - - - - - - -
when TESTA8 =>
next_state <= TESTA8;
if (KEY(1) = '1') then
next_state <= TESTA9;
elsif (KEY(15) = '1') then
next_state <= PRINT_MESSAGE_ERR;
elsif (KEY(15 downto 0) /= "0000000000000000") then
next_state <= FAIL;
end if;
-- - - - - - - - - - - - - - - - - - - - - - -
when TESTB8 =>
next_state <= TESTB8;
if (KEY(3) = '1') then
next_state <= TESTB9;
elsif (KEY(15) = '1') then
next_state <= PRINT_MESSAGE_ERR;
elsif (KEY(15 downto 0) /= "0000000000000000") then
next_state <= FAIL;
end if;
-- - - - - - - - - - - - - - - - - - - - - - - KONEC A
when TESTA9 =>
next_state <= TESTA9;
if (KEY(3) = '1') then
next_state <= TEST_ENT;
elsif (KEY(15) = '1') then
next_state <= PRINT_MESSAGE_ERR;
elsif (KEY(15 downto 0) /= "0000000000000000") then
next_state <= FAIL;
end if;
-- - - - - - - - - - - - - - - - - - - - - - -
when TESTB9 =>
next_state <= TESTB9;
if (KEY(0) = '1') then
next_state <= TESTB10;
elsif (KEY(15) = '1') then
next_state <= PRINT_MESSAGE_ERR;
elsif (KEY(15 downto 0) /= "0000000000000000") then
next_state <= FAIL;
end if;
-- - - - - - - - - - - - - - - - - - - - - - -KONEC B
when TESTB10 =>
next_state <= TESTB10;
if (KEY(0) = '1') then
next_state <= TEST_ENT;
elsif (KEY(15) = '1') then
next_state <= PRINT_MESSAGE_ERR;
elsif (KEY(15 downto 0) /= "0000000000000000") then
next_state <= FAIL;
end if;
-- - - - - - - - - - - - - - - - - - - - - - -KONEC B
when TEST_ENT =>
next_state <= TEST_ENT;
if (KEY(15) = '1') then
next_state <= PRINT_MESSAGE_OK;
elsif (KEY(15 downto 0) /= "0000000000000000") then
next_state <= FAIL;
end if;
-- - - - - - - - - - - - - - - - - - - - - - -
when FAIL =>
next_state <= FAIL;
if (KEY(15) = '1') then
next_state <= PRINT_MESSAGE_ERR;
end if;
-- - - - - - - - - - - - - - - - - - - - - - -
when PRINT_MESSAGE_ERR =>
next_state <= PRINT_MESSAGE_ERR;
if (CNT_OF = '1') then
next_state <= FINISH;
end if;
-- - - - - - - - - - - - - - - - - - - - - - -
when PRINT_MESSAGE_OK =>
next_state <= PRINT_MESSAGE_OK;
if (CNT_OF = '1') then
next_state <= FINISH;
end if;
-- - - - - - - - - - - - - - - - - - - - - - -
when FINISH =>
next_state <= FINISH;
if (KEY(15) = '1') then
next_state <= TEST1;
end if;
-- - - - - - - - - - - - - - - - - - - - - - -
when others =>
next_state <= TEST1;
end case;
end process next_state_logic;
-- -------------------------------------------------------
output_logic : process(present_state, KEY)
begin
FSM_CNT_CE <= '0';
FSM_MX_MEM <= '0';
FSM_MX_LCD <= '0';
FSM_LCD_WR <= '0';
FSM_LCD_CLR <= '0';
case (present_state) is
-- - - - - - - - - - - - - - - - - - - - - - -
when PRINT_MESSAGE_ERR =>
FSM_MX_MEM <= '0';
FSM_CNT_CE <= '1';
FSM_MX_LCD <= '1';
FSM_LCD_WR <= '1';
-- - - - - - - - - - - - - - - - - - - - - - -
when PRINT_MESSAGE_OK =>
FSM_MX_MEM <= '1';
FSM_CNT_CE <= '1';
FSM_MX_LCD <= '1';
FSM_LCD_WR <= '1';
-- - - - - - - - - - - - - - - - - - - - - - -
when FINISH =>
if (KEY(15) = '1') then
FSM_LCD_CLR <= '1';
end if;
-- - - - - - - - - - - - - - - - - - - - - - -
when others =>
if (KEY(14 downto 0) /= "000000000000000") then
FSM_LCD_WR <= '1';
end if;
if (KEY(15) = '1') then
FSM_LCD_CLR <= '1';
end if;
end case;
end process output_logic;
end architecture behavioral;