shezhi.vhd

消抖程序

library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_unsigned.all;
entity shezhi is

  port
	(  mode     : in  std_logic;
	   sure     : in  std_logic;
         up     : in  std_logic;
    wait_en     : out  std_logic;
       price1   : out std_logic_vector (3 downto 0);
       price2   : out std_logic_vector (3 downto 0);
       price3   : out std_logic_vector (3 downto 0);
        time1   : out std_logic_vector (3 downto 0);
        time2   : out std_logic_vector (3 downto 0);
        time3   : out std_logic_vector (3 downto 0);
        time4   : out std_logic_vector (3 downto 0);
      display   : out std_logic_vector (3 downto 0)
     );
end entity;
architecture arc of shezhi is
signal data       :  std_logic_vector (3 downto 0);
signal switch     :  std_logic_vector (2 downto 0):="000";
begin

p1:process(mode) is
begin
if(mode'event and mode='1')then
        switch<=switch+1;
    if(switch="111")then
        switch<="000";
    end if;
 end if;
end process;

p2:process(up) is 
 begin
 if(up'event and up='1')then
    data<=data+1;
 end if;
if data(3)='1' and (not(data(2 downto 1)="00")) then
      data<=data+"0110"; 
 end if;
end process;

p3:process(sure) is
 begin
 if(sure'event and sure='1')then

  case switch is
           when "000" =>wait_en<=up;
           when "001" => price1<=data;
           when "010" => price2<=data;
           when "011" => price3<=data;
           when "100" => time1<=data; 
           when "101" => time2<=data;
           when "110" => time3<=data;
           when "111" => time4<=data;
           when others=> time1<=data;
end case;
end if;
end process;

display<=data;

end arc;