In line 99, i concatenated keyval1 and keyval2 to get a 16 bit xkey signal.

Then in line 153, im trying to check if xkey is equal to E074. But it gives me the error “cant determine definition of operator =”. If i put x”E074″ then it gives an error “digit ‘0’ in based literal “X”E074″” must be smaller than base”. I cant figure out what to do and im kind of in a hurry. Any help is really appreciated.

----------------------------------------------------------------------------------
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
--use IEEE.STD_LOGIC_ARITH.ALL;
use IEEE.STD_LOGIC_UNSIGNED.ALL;
use IEEE.math_real.all;
use work.SQUARE.all;
use IEEE.NUMERIC_STD.ALL;


entity VGA is
    Port ( CLK25              : IN  STD_LOGIC;                                                                          
           rez_160x120        : IN  STD_LOGIC;
           rez_320x240        : IN  STD_LOGIC;
              Hsync,Vsync        : OUT STD_LOGIC;                       
              Nblank             : OUT STD_LOGIC;                               
           activecam_o        : OUT STD_LOGIC;
              KEYS: IN STD_LOGIC_VECTOR(3 DOWNTO 0);
              S: IN STD_LOGIC_VECTOR(1 DOWNTO 0);
             --cam_data_i         : IN  STD_LOGIC_VECTOR(11 DOWNTO 0);
             --activecam_i        : IN  STD_LOGIC;
             R,G,B              : OUT   STD_LOGIC_VECTOR (7 DOWNTO 0);
             --distance_in        : IN  INTEGER range 0 to 255 ;  
             --motor_location_in : IN  INTEGER range 0 to 360 ; 
              Nsync              : OUT STD_LOGIC);  
end VGA;

architecture Behavioral of VGA is
signal Hcnt:STD_LOGIC_VECTOR(9 downto 0):="0000000000";     
signal Vcnt:STD_LOGIC_VECTOR(9 downto 0):="1000001000";     
signal video:STD_LOGIC;
constant HM: integer :=799; 
constant HD: integer :=640; 
constant HF: integer :=16;      
constant HB: integer :=48;      
constant HR: integer :=96;      
constant VM: integer :=524; 
constant VD: integer :=480; 
constant VF: integer :=10;      
constant VB: integer :=33;      
constant VR: integer :=2;       
signal counter :integer  range 0 to 200_000_000 :=0;
signal co :integer:=0;
signal ball_row: integer := 240; -- 480/2
signal ball_col: integer := 320; -- 640/2
signal ball_size : integer := 5;
type sinlut is array (0 to 359) of integer;--
signal sinrom : sinlut;
signal cosrom : sinlut;
--------- square
SIGNAL RGB: STD_LOGIC_VECTOR(3 DOWNTO 0);
SIGNAL DRAW1,DRAW2,DRAW3: STD_LOGIC;
SIGNAL SQ_X1,SQ_Y1: integer range 0 to 1688:=125;
SIGNAL SQ_X2,SQ_Y2: integer range 0 to 1688:=250;
SIGNAL SQ_X3,SQ_Y3: integer range 0 to 1688:=480;

signal pixel_column_W : std_logic_vector(9 downto 0);
signal pixel_row_W    : std_logic_vector(9 downto 0);
signal HSYNC_W,VSYNC_W: STD_LOGIC;
-----


signal pixel_row     : std_logic_vector(9 downto 0);
signal pixel_column : std_logic_vector(9 downto 0);
-------clock divider
signal slow_clk : STD_LOGIC;

    component Clock_Divider
        Port ( 
            clk      : in  STD_LOGIC;
            reset    : in  STD_LOGIC;
            clock_out: out STD_LOGIC
        );
    end component;
-------------------------
signal clr,ps2c,ps2d: STD_LOGIC;
signal keyval1, keyval2, keyval3: STD_LOGIC_VECTOR(7 downto 0);
signal xkey: STD_LOGIC_VECTOR(15 downto 0);

component keyboard_ctrl is
            port(
                        clk25: in STD_LOGIC;
                        clr: in STD_LOGIC;
                        PS2C: in STD_LOGIC;
                        PS2D: in STD_LOGIC;
                        keyval1: out STD_LOGIC_VECTOR(7 downto 0);
                        keyval2: out STD_LOGIC_VECTOR(7 downto 0);
                        keyval3: out STD_LOGIC_VECTOR(7 downto 0)
                    );
end component;
------------------------     
     

begin
--------- adding clock divider

K1: keyboard_ctrl port map (clk25 => clk25, clr => clr, ps2c => ps2c, ps2d => ps2d, keyval1 => keyval1, keyval2 => keyval2, keyval3 => keyval3);
xkey <= keyval1 & keyval2;

U1: Clock_Divider port map (clk => CLK25, reset => '0', clock_out => slow_clk);
SQ_X3 <= 420;
SQ_Y3 <= 350;
--Hcnt <=std_logic_vector(to_unsigned(9, 10));
--Hsync <= HSYNC_W;
--Vsync <= VSYNC_W;
SQ(
    to_integer(unsigned(pixel_column)),
    to_integer(unsigned(pixel_row)),
    SQ_X1,
    SQ_Y1,
    RGB,
    DRAW1
);
SQ(
    to_integer(unsigned(pixel_column)),
    to_integer(unsigned(pixel_row)),
    SQ_X2,
    SQ_Y2,
    RGB,
    DRAW2
);
SQ(
    to_integer(unsigned(pixel_column)),
    to_integer(unsigned(pixel_row)),
    SQ_X3,
    SQ_Y3,
    RGB,
    DRAW3
);

genrom_sin: for i in 0 to 359 generate
constant x : real := sin ( real(i) * math_pi / real(179));
constant xn : integer := (integer (x * real(100)));
begin
    sinrom(i) <= xn;
end generate;
    
genrom_cos: for i in 0 to 359 generate
constant x : real := cos ( real(i) * math_pi / real(179));
constant xn : integer := (integer (x * real(100)));
begin
    cosrom(i) <= xn;
end generate;

pixel_column <= Hcnt;
pixel_row    <= Vcnt;
---------------slow clock
process(slow_clk)
    begin
        if rising_edge(slow_clk) then
            if S(0) = '1' then
                if (xkey = "EO74") then
                    SQ_X1 <= SQ_X1 + 1;
                end if;
                if (xkey = "E06B") then
                    SQ_X1 <= SQ_X1 - 1;
                end if;
                if (xkey = "E072") then
                    SQ_Y1 <= SQ_Y1 - 1;
                end if;
                if (xkey = "E075") then
                    SQ_Y1 <= SQ_Y1 + 1;
                end if;
            end if;

            if S(1) = '1' then
                if (xkey = "EO74") then
                    SQ_X2 <= SQ_X2 + 1;
                end if;
                if (xkey = "E06B") then
                    SQ_X2 <= SQ_X2 - 1;
                end if;
                if (xkey = "E072") then
                    SQ_Y2 <= SQ_Y2 - 1;
                end if;
                if (xkey = "E075") then
                    SQ_Y2 <= SQ_Y2 + 1;
                end if;
            end if;
        end if;
    end process;

--------------------
    process(CLK25)
        begin

            if (CLK25'event and CLK25='1') then 
                if (Hcnt = HM) then
                    Hcnt <= "0000000000";
               if (Vcnt= VM) then
                  Vcnt <= "0000000000";
                  activecam_o <= '1';
               else
                  if rez_160x120 = '1' then
                     if vCnt < 120-1 then
                        activecam_o <= '1';
                                
                     end if;
                  elsif rez_320x240 = '1' then
                     if vCnt < 240-1 then
                        activecam_o <= '1';
                     end if;
                  else
                     if vCnt < 480-1 then
                        activecam_o <= '1';
                     end if;
                  end if;
                  Vcnt <= Vcnt+1;
               end if;
                else
               if rez_160x120 = '1' then
                  if hcnt = 160-1 then
                     activecam_o <= '0';
                  end if;
               elsif rez_320x240 = '1' then
                  if hcnt = 320-1 then
                     activecam_o <= '0';
                  end if;
               else
                  if hcnt = 640-1 then
                     activecam_o <= '0';
                  end if;
               end if;
                    Hcnt <= Hcnt + 1;
                end if;
            end if;
        end process;
--process(CLK25)
--begin
--  if (rising_edge(CLK25)) then
--    if counter = 25_000_000 then
--      co <= 0;
--    elsif counter = 50_000_000 then
--      co <= 50;
--    elsif counter = 75_000_000 then
--      co <= 120;
--    elsif counter = 100_000_000 then
--      co <= 160;
--    elsif counter = 125_000_000 then
--      co <= 210;
--   elsif counter = 150_000_000 then
--      co <= 260;
--   elsif counter = 175_000_000 then
--      co <= 310;  
--  elsif counter = 200_000_000 then
--      co <= 350;  
--      counter <= 0;   
--    end if;
--      counter <= counter + 1;
--  end if;
--end process;

        
   process(video)
   begin

--     if (distance_in > 0) then
--     if distance_in > 100 then -- if distance is higher than 200cm, show black point at 10x10 pixel
--       ball_row <= 10;
--       ball_col <= 10;
--       R <= (others => '0');
--       G <= (others => '0');
--       B <= (others => '0');
--     else
--       ball_col <= (distance_in*(cosrom (motor_location_in))/100)*2+320;---en son çembere göre 175 oldu için değelere maplamek istenilen sayıya bolunuğ çarpılıyor. 
--       ball_row <= (distance_in*(sinrom (motor_location_in))/100)*2+240;-- ornek 175 en son cember normalde 175  150 istiyoruz =>>>>175/150 çarp      
--     end if;
--     end if;

     -----DRAW BACKGROUND BLACK---- square
        IF(DRAW1='1')THEN
           IF(S(0)='1')THEN
             R <= (others => '1');
             G <= (others => '0');
             B <= (others => '0');
            ELSE
             R <= (others => '1');
             G <= (others => '1');
             B <= (others => '1');    
            END IF;
        END IF;
        IF(DRAW2='1')THEN
           IF(S(1)='1')THEN
             R <= (others => '1');
             G <= (others => '0');
             B <= (others => '0');
            ELSE
             R <= (others => '1');
             G <= (others => '1');
             B <= (others => '1');    
            END IF;
        END IF; 
        IF(DRAW1='0' AND DRAW2 ='0')THEN
             R <= (others => '0');
             G <= (others => '0');
             B <= (others => '0');      
        
        END IF;



            
      
--     if (pixel_row > 0 and pixel_row < 480 and pixel_column > 0 and pixel_column < 640) then 
--       R <= (others => '0');
--       G <= (others => '0');
--       B <= (others => '0');
--       
--    if (pixel_row = 1048 or pixel_column = 554)then
--    R <= (others => '1');
--    G <= (others => '1');
--    B <= (others => '1');
--    else
--    R <= (others => '0');
--    G <= (others => '0');
--    B <= (others => '0');
--    end if; 
--    
--    if (pixel_row = 1 or pixel_column = 1)then
--    R <= (others => '1');
--    G <= (others => '0');
--    B <= (others => '1');
--    end if;
--    
--    if (pixel_row = 10 or pixel_column = 10)then
--    R <= (others => '1');
--    G <= (others => '1');
--    B <= (others => '0');
--    end if;
----------------------Lines----------------   
      if (pixel_row > 120 and pixel_column = 320)then
      R <= (others => '1');
      G <= (others => '1');
      B <= (others => '1');
      end if;
      if (pixel_row = 120 and pixel_column > 0)then
      R <= (others => '1');
      G <= (others => '1');
      B <= (others => '1');
      end if;
-------------------------------------  
--    IF(DRAW3='1')THEN
--    R <= (others => '1');
--    G <= (others => '1');
--    B <= (others => '1');
--    ELSE
--    R <= (others => '0');
--    G <= (others => '0');
--    B <= (others => '0');
--    end if;
--    if (pixel_row = 240 or pixel_column = 320)then
--    R <= (others => '0');
--    G <= (others => '1');
--    B <= (others => '0');
--    end if;


--    if (pixel_row = 100 or pixel_column = 100)then
--    R <= (others => '1');
--    G <= (others => '1');
--    B <= (others => '1');
--    end if;
         
    

    
    
    --------------- burdan sonras� benim kendi �izimlerim merkezi ortadan sa�a 50 pixel kayd�rd�m
    -----DRAW POINT MAGENTA----
--  if (activecam_i = '1') then 
--      R <= cam_data_i(11 downto 8) & cam_data_i(11 downto 8);        
--      G <= cam_data_i(7 downto 4)  & cam_data_i(7 downto 4) ;
--      B <= cam_data_i(3 downto 0)  & cam_data_i(3 downto 0) ;   
--  end if;
------------------------------  
--  if ( (pixel_column-50) > (ball_col - ball_size) and (pixel_column-50) < (ball_col + ball_size) and pixel_row > (ball_row - ball_size) and pixel_row < (ball_row + ball_size) ) then
--     R <= (others => '1');
--     G <= (others => '1');
--     B <= (others => '1');
--  end if;
----    
--    if ( ( ((conv_integer(pixel_column)-370)*(conv_integer(pixel_column)-370)) + ((conv_integer(pixel_row)-240)*(conv_integer(pixel_row)-240)) ) <= 2500
--    and ( ((conv_integer(pixel_column)-370)*(conv_integer(pixel_column)-370)) + ((conv_integer(pixel_row)-240)*(conv_integer(pixel_row)-240)) ) >= 2401) then 
--     R <= (others => '1');
--     G <= (others => '0');
--     B <= (others => '0');
--  end if;
--  
--  if ( ( ((conv_integer(pixel_column)-370)*(conv_integer(pixel_column)-370)) + ((conv_integer(pixel_row)-240)*(conv_integer(pixel_row)-240)) ) <= 4900
--    and ( ((conv_integer(pixel_column)-370)*(conv_integer(pixel_column)-370)) + ((conv_integer(pixel_row)-240)*(conv_integer(pixel_row)-240)) ) >= 4761) then
--     R <= (others => '1');
--     G <= (others => '0');
--     B <= (others => '0');
--  end if;
--  
--  if ( ( ((conv_integer(pixel_column)-370)*(conv_integer(pixel_column)-370)) + ((conv_integer(pixel_row)-240)*(conv_integer(pixel_row)-240)) ) <= 8100
--    and ( ((conv_integer(pixel_column)-370)*(conv_integer(pixel_column)-370)) + ((conv_integer(pixel_row)-240)*(conv_integer(pixel_row)-240)) ) >= 7921) then
--     R <= (others => '1');
--     G <= (others => '0');
--     B <= (others => '0');
--  end if;
--  
--  if ( ( ((conv_integer(pixel_column)-370)*(conv_integer(pixel_column)-370)) + ((conv_integer(pixel_row)-240)*(conv_integer(pixel_row)-240)) ) <= 12100
--    and ( ((conv_integer(pixel_column)-370)*(conv_integer(pixel_column)-370)) + ((conv_integer(pixel_row)-240)*(conv_integer(pixel_row)-240)) ) >= 11881) then
--     R <= (others => '1');
--     G <= (others => '0');
--     B <= (others => '0');
--  end if;
--  
--  if ( ( ((conv_integer(pixel_column)-370)*(conv_integer(pixel_column)-370)) + ((conv_integer(pixel_row)-240)*(conv_integer(pixel_row)-240)) ) <= 16900
--    and ( ((conv_integer(pixel_column)-370)*(conv_integer(pixel_column)-370)) + ((conv_integer(pixel_row)-240)*(conv_integer(pixel_row)-240)) ) >= 16641) then
--     R <= (others => '1');
--     G <= (others => '0');
--     B <= (others => '0');
--  end if;
--  
--  if ( ( ((conv_integer(pixel_column)-370)*(conv_integer(pixel_column)-370)) + ((conv_integer(pixel_row)-240)*(conv_integer(pixel_row)-240)) ) <= 22500
--    and ( ((conv_integer(pixel_column)-370)*(conv_integer(pixel_column)-370)) + ((conv_integer(pixel_row)-240)*(conv_integer(pixel_row)-240)) ) >= 22201) then
--     R <= (others => '1');
--     G <= (others => '0');
--     B <= (others => '0');
--  end if;
--  
--  if ( ( ((conv_integer(pixel_column)-370)*(conv_integer(pixel_column)-370)) + ((conv_integer(pixel_row)-240)*(conv_integer(pixel_row)-240)) ) <= 28900
--    and ( ((conv_integer(pixel_column)-370)*(conv_integer(pixel_column)-370)) + ((conv_integer(pixel_row)-240)*(conv_integer(pixel_row)-240)) ) >= 28561) then
--     R <= (others => '1');
--     G <= (others => '0');
--     B <= (others => '0');
--  end if;     
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    --------------------------------------------------------------------------------------

    
    --------------------------------------------------------------------------------------------
    
    
    
--end if;  
end process;
   
    process(CLK25)
        begin
            if (CLK25'event and CLK25='1') then
                if (Hcnt >= (HD+HF) and Hcnt <= (HD+HF+HR-1)) then   --- Hcnt >= 656 and Hcnt <= 751
                    Hsync <= '0';

                else
                    Hsync <= '1';
                end if;
            end if;
        end process;

    process(CLK25)
        begin
            if (CLK25'event and CLK25='1') then
                if (Vcnt >= (VD+VF) and Vcnt <= (VD+VF+VR-1)) then  ---Vcnt >= 490 and vcnt<= 491
                    Vsync <= '0';
                else
                    Vsync <= '1';
                end if;
            end if;
        end process;

--PROCESS(CLK25)
-- BEGIN
--IF(CLK25'EVENT AND CLK25='1')THEN
--      IF(DRAW1='1')THEN
--        IF(S(0)='1')THEN
--          R<=(others=>'1');
--          G<=(others=>'0');
--          B<=(others=>'0');
--          ELSE
--          R<=(others=>'1');
--          G<=(others=>'1');
--          B<=(others=>'1');
--          END IF;
--      END IF;
--       IF(DRAW2='1')THEN
--        IF(S(1)='1')THEN
--          R<=(others=>'1');
--          G<=(others=>'0');
--          B<=(others=>'0');
--          ELSE
--          R<=(others=>'1');
--          G<=(others=>'1');
--          B<=(others=>'1');
--        END IF;
--      END IF;
--      IF (DRAW1='0' AND DRAW2='0')THEN
--         R<=(others=>'0');
--        G<=(others=>'0');
--        B<=(others=>'0');
--      END IF;
--      IF(Hcnt<1688)THEN
--      Hcnt<=Hcnt+1;
--      ELSE
--      Hcnt <= "0000000000";
--        IF(Vcnt<1066)THEN
--            Vcnt<=Vcnt+1;
--            ELSE
--            Vcnt<= "0000000000"; 
--                IF(S(0)='1')THEN
--                      IF(KEYS(0)='0')THEN
--                        SQ_X1<=SQ_X1+5;
--                       END IF;
--                   IF(KEYS(1)='0')THEN
--                        SQ_X1<=SQ_X1-5;
--                       END IF;
--                        IF(KEYS(2)='0')THEN
--                        SQ_Y1<=SQ_Y1-5;
--                       END IF;
--                       IF(KEYS(3)='0')THEN
--                        SQ_Y1<=SQ_Y1+5;
--                       END IF;  
--                  END IF;
--                IF(S(1)='1')THEN
--                      IF(KEYS(0)='0')THEN
--                        SQ_X2<=SQ_X2+5;
--                       END IF;
--                   IF(KEYS(1)='0')THEN
--                        SQ_X2<=SQ_X2-5;
--                       END IF;
--                        IF(KEYS(2)='0')THEN
--                        SQ_Y2<=SQ_Y2-5;
--                       END IF;
--                       IF(KEYS(3)='0')THEN
--                        SQ_Y2<=SQ_Y2+5;
--                       END IF; 
--                  END IF;  
--            END IF;
--      END IF;
--   IF((Hcnt>0 AND Hcnt<408) OR (Vcnt>0 AND Vcnt<42))THEN
--  R<=(others=>'0');
--  G<=(others=>'0');
--  B<=(others=>'0');
--  END IF;
--   IF(Hcnt>48 AND Hcnt<160)THEN----Hsync
--     HSYNC_W<='0';
--  ELSE
--     HSYNC_W<='1';
--  END IF;
--   IF(Vcnt>0 AND Vcnt<4)THEN----------Vsync
--     VSYNC_W<='0';
--  ELSE
--     VSYNC_W<='1';
--  END IF;
-- END IF;
-- END PROCESS;
            
Nsync <= '1';
video <= '1' when (Hcnt < HD) and (Vcnt < VD) else '0';
Nblank <= video;

        
end Behavioral;

I played with brackets ‘ and “, i removed X, tried adding paranthesis. Nothing worked