scan8_line.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;
 
library work;
   use work.my_package.all;

entity SCAN8_LINE is
      Port (   
		RESET : In	STD_LOGIC;
		CLK_1M : In	STD_LOGIC;	-- 1MHz Clock
		TEST : In	STD_LOGIC; 	--  '1' for test mode

		ID7 : In	UNSIGNED (9 downto 0); -- 8-bit CODE + 2-bit MODE
		ID6 : In	UNSIGNED (9 downto 0); -- MODE: 00 for タ盽家Α
		ID5 : In	UNSIGNED (9 downto 0); --       01 for はフ家Α
		ID4 : In	UNSIGNED (9 downto 0); --       10 for 皗脅家Α
		ID3 : In	UNSIGNED (9 downto 0); --       11 for OFF 家Α
		ID2 : In	UNSIGNED (9 downto 0);
		ID1 : In	UNSIGNED (9 downto 0);
		ID0 : In	UNSIGNED (9 downto 0);
		
		SCAN_COL : Out	STD_LOGIC_VECTOR (7 downto 0);
		SCAN_ROW : Out	STD_LOGIC_VECTOR (7 downto 0);
		SCAN_DIG : Out	STD_LOGIC_VECTOR (2 downto 0);
		--SCAN_DIG : Out	STD_LOGIC_VECTOR (7 downto 0);
		DISP_ID : Out   UNSIGNED (7 downto 0)

		);
end SCAN8_LINE;

architecture BEHAVIORAL of SCAN8_LINE is
signal div_05M : STD_LOGIC_VECTOR(19 downto 0);
signal TEST_CLK_en : STD_LOGIC;
signal SCAN_COUNT : STD_LOGIC_VECTOR(5 downto 0);
signal iSCAN_LINE : STD_LOGIC_VECTOR(7 downto 0);
signal iSCAN_DIGIT : STD_LOGIC_VECTOR(2 downto 0);
signal iSCAN_ROW : UNSIGNED(2 downto 0);
signal iFONT_CODE : STD_LOGIC_VECTOR(7 downto 0);
signal iSCAN_ADDR : UNSIGNED(10 downto 0);
signal iDISP_CODE : RAM_TYPE(7 downto 0); 
signal iDISP_ID : UNSIGNED(7 downto 0);
signal iMODE : UNSIGNED(1 downto 0);
signal iBlink_CLK : STD_LOGIC;


component CHAR_FONT 
Port (   
		SCAN_ADDR : In	UNSIGNED (10 downto 0);
		FONT_CODE : Out	STD_LOGIC_VECTOR (7 downto 0)
		);
end component;


begin

----------- 8 digit scan module ------------------------

  process(RESET,CLK_1M)
  begin
  	if RESET = '1' then
		iSCAN_LINE <= "10000000";
		SCAN_COUNT <= "111111";  -- Digit Count & Line Count
  	elsif CLK_1M'event and CLK_1M = '1' then
		if SCAN_COUNT(2 downto 0) = "111" then -- rotate left 1 bit
			iSCAN_LINE <= iSCAN_LINE(6 downto 0) & iSCAN_LINE(7);
		end if;
		SCAN_COUNT <= SCAN_COUNT + 1;
  	end if;
  end process;

  process(RESET,CLK_1M)
  begin
  	if RESET = '1' then
  		div_05M <= X"00000";
  		iBlink_CLK <= '0';	-- ~2Hz clock
  	elsif CLK_1M'event and CLK_1M = '1' then
		if TEST = '0' then -- Normal use, 
	  		if div_05M(18) = '1' then
  				div_05M <= X"00000";
  				iBlink_CLK <= not iBlink_CLK;
	  		else
  				div_05M <= div_05M + 1;
	  		end if;
		else -- Test Mode, CLK_2Hz = 1M/16 
			iBlink_CLK <= TEST_CLK_en;
  		end if;
  	end if;
  end process;

  TEST_CLK_en <= '1' when SCAN_COUNT = "111111" else
		     '0';

  iSCAN_DIGIT <= not SCAN_COUNT(2 downto 0);
  iSCAN_ROW <= CONV_UNSIGNED(CONV_INTEGER(SCAN_COUNT(5 downto 3)),3);


  SCAN_DIG    <= iSCAN_DIGIT;
  --SCAN_DIG <=	"01111111" when iSCAN_DIGIT = "111" else
  --		"10111111" when iSCAN_DIGIT = "110" else
  --		"11011111" when iSCAN_DIGIT = "101" else
  --		"11101111" when iSCAN_DIGIT = "100" else
  --		"11110111" when iSCAN_DIGIT = "011" else
  --		"11111011" when iSCAN_DIGIT = "010" else
  --		"11111101" when iSCAN_DIGIT = "001" else
  --		"11111110";

  iDISP_ID <=   ID7(9 downto 2) when iSCAN_DIGIT = "111" else
		ID6(9 downto 2) when iSCAN_DIGIT = "110" else
		ID5(9 downto 2) when iSCAN_DIGIT = "101" else
		ID4(9 downto 2) when iSCAN_DIGIT = "100" else
		ID3(9 downto 2) when iSCAN_DIGIT = "011" else
		ID2(9 downto 2) when iSCAN_DIGIT = "010" else
		ID1(9 downto 2) when iSCAN_DIGIT = "001" else
		ID0(9 downto 2);
 
   iMODE <=	ID7(1 downto 0) when iSCAN_DIGIT = "111" else
	   	ID6(1 downto 0) when iSCAN_DIGIT = "110" else
	   	ID5(1 downto 0) when iSCAN_DIGIT = "101" else
	   	ID4(1 downto 0) when iSCAN_DIGIT = "100" else
	   	ID3(1 downto 0) when iSCAN_DIGIT = "011" else
	   	ID2(1 downto 0) when iSCAN_DIGIT = "010" else
	   	ID1(1 downto 0) when iSCAN_DIGIT = "001" else
	   	ID0(1 downto 0);


 iSCAN_ADDR <= iDISP_ID & iSCAN_ROW;

  DISP_ID <= iDISP_ID;

  --SCAN_COL <= iFONT_CODE;
  SCAN_COL <= iFONT_CODE when iMODE = 0 else
  		NOT iFONT_CODE when iMODE = 1 else
  		--iFONT_CODE AND iBlink_CLK;
		iFONT_CODE when iMODE = 2 and iBlink_CLK = '1' else
		"00000000"; -- when iMODE = 3 or iBlink_CLK = 0
  SCAN_ROW <= iSCAN_LINE;

  FONT_ROM: CHAR_FONT 
  	Port Map (   
		SCAN_ADDR => iSCAN_ADDR,
		FONT_CODE => iFONT_CODE );


end BEHAVIORAL;