static_digital.vhd

静态数码管显示的控制,数码管为共阳极数码管

library IEEE;
use IEEE.STD_LOGIC_1164.all;
use IEEE.STD_LOGIC_unsigned.all;


entity static_digital is
  port(
       sysclk: in  std_logic;
       wei :   out std_logic_vector(5 downto 0);
       duan:   out std_logic_vector(7 downto 0)
       );
end entity static_digital;

architecture lxf of static_digital is
signal   cnt : std_logic_vector ( 24 downto 0);--20M
signal   count : std_logic_vector(3 DOWNTO 0); 
begin
  process(sysclk)
    begin
    if(sysclk 'event and sysclk='1') then
	     cnt<=cnt+1;
	     if(cnt="1001100010010110100000000")then
	       cnt<="0000000000000000000000000";
	       count <=count+1; 
	     end if;
	end if;
end process;	

process(count)
begin
case count is
	when "0000" =>duan <= "11000000";--0
	when "0001" =>duan <= "11111001";--1
	when "0010" =>duan <= "10100100";--2
	when "0011" =>duan <= "10110000";--3
	when "0100" =>duan <= "10011001";--4
	when "0101" =>duan <= "10010010";--5
	when "0110" =>duan <= "10000010";--6
	when "0111" =>duan <= "11111000";--7
	when "1000" =>duan <= "10000000";--8
	when "1001" =>duan <= "10010000";--9
	when "1010" =>duan <= "10001000";--A
	when "1011" =>duan <= "10000011";--b
	when "1100" =>duan <= "11000110";--C
	when "1101" =>duan <= "10100001";--d
	when "1110" =>duan <= "10000110";--E
	when "1111" =>duan <= "10001110";--f
       WHEN OTHERS =>duan <= "11000000";--0;
end case;
end process;	  
wei<="111111";
end lxf;