Need help in code

Gombo K. OP #5239675
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Hello
I'm currently working on my assignment in Spartan-3E.My assignment is:
While button is clicked show values of switches in low 4 bit of LED,when 
button is released move from left to right.Switching speed 2Hz.
But i haven't got any success so far.It not even showing values of 
switch.
And here is my code:
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library IEEE;

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use IEEE.STD_LOGIC_1164.ALL;

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use ieee.std_logic_unsigned.all;

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use ieee.std_logic_arith.all;

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entity daalgavar_13 is

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Port ( clk : in STD_LOGIC;

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       led : out STD_LOGIC_VECTOR (7 downto 0);

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       button : in std_logic;

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       switch : in  STD_LOGIC_VECTOR (3 downto 0));

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end daalgavar_13;

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architecture Behavioral of daalgavar_13 is

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signal clk_2G: std_logic;

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signal tooluur: integer range 0 to 25000000;

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signal data : STD_LOGIC_VECTOR (7 downto 0);

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 begin 

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--led<=data;

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 process(clk_2G) --, switch)

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 variable temp:std_logic_vector(7 downto 0);

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 begin

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 --if (rst = '0') then

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 if clk_2G'event and clk_2G='1' then

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  if button='1' then

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   data <="0000" & switch(3 downto 0);

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  else 

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   temp := data;

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   data <= temp (6 downto 0)& temp(7) ;

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  end if;

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 end if;

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end process;

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led<=data;

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process(clk)

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begin

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 if clk'event and clk='1' then 

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  if tooluur=25000000 then  --2Hz

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   tooluur<=0;

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   clk_2G<='1';

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   else 

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    tooluur<=tooluur+1;

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    clk_2G<='0';

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   end if;

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  end if;

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 end process;

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end Behavioral;




Thank you
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Lothar M. Moderator (Company: Titel) #5239771
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Rock B. wrote:
> where did i go wrong?
First: what does the simulation say?

Second: use your clock enable as a clock enable, not as a clock:
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process(clk) -- the one and only clock in the whole design!

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variable temp:std_logic_vector(7 downto 0);

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begin

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   if clk'event and clk='1' then

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      if clk_2G='1' then -- this is the 2Hz clock enable

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         if button='1' then

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            data <="0000" & switch(3 downto 0);

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         else 

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            ...


Third, why this:
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   temp := data;

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   data <= temp (6 downto 0)& temp(7) ;

And not simply this:
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   data <= data(6 downto 0)& data(7) ;
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Vancouver Guest #5239780
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Assuming the simulation is fine:

- Are you sure that the pin mapping on your board (ucf) is correct?
- Is the clock source running and at the correct frequency as assumed by 
your clock divider?
 Can you monitor clk_2G on an LED?
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