[SOLVED] Led Control with push button swich

Hi
I am new to FPGA world. I am using a Xilinx ML 402 Board for my experiment. I writen a code to glow the LED for 1sec and off for 0.5 sec.
But the LED is always OFF.

this is my code.


library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_ARITH.ALL;
use IEEE.STD_LOGIC_UNSIGNED.ALL;
use work.one.all;
---- Uncomment the following library declaration if instantiating
---- any Xilinx primitives in this code.
--library UNISIM;
--use UNISIM.VComponents.all;




entity pulse_gen is
Port ( SYSCLK : in STD_LOGIC;
pulse_out : out STD_LOGIC;
count : out integer);
end pulse_gen;

architecture Behavioral of pulse_gen is
begin
process(SYSCLK)
variable c : integer:=0;
begin
if ( SYSCLK = '1') then
if c <= 2000000000 then
if c <= 1000000000 then
pulse_out <='1';
else pulse_out <= '0';
end if;
else c := 0;
end if;
end if;

c := c + 1;
count <= c;
end process;

end Behavioral;



My ucf is
NET SYSCLK LOC = AE14;
NET pulse_out LOC = E7;

No correct synchronous description, you have to write rising_edge(sysclk) rather than sysclk = '1'.

In addition, c := c + 1 is misplaced. It must be inside the clock edge triggered code.

@satya_kola, i don't find push button in your code. if you want to on/off led here is the sample code with 1sec delay. you canmodify to your requirement.

**broken link removed**

Hope this will help you.

thanks it helped me a lot