这是我正在使用的代码，但我需要放慢时钟以查看列和行的变化情况。我认为我的时钟存在一些问题：
library IEEE;
use IEEE.STD_LOGIC_1164.all;
use IEEE.STD_LOGIC_ARITH.all;
use IEEE.STD_LOGIC_UNSIGNED.all;
-- Uncomment the following library declaration if using
-- arithmetic functions with Signed or Unsigned values
--use IEEE.NUMERIC_STD.ALL;
-- Uncomment the following library declaration if instantiating
-- any Xilinx primitives in this code.
--library UNISIM;
--use UNISIM.VComponents.all;
entity dot_matrix is
port (main_clk, en : in std_logic;
switches : in std_logic_vector (3 downto 0);
rows : inout std_logic_vector (6 downto 0);
col : inout std_logic_vector (4 downto 0));
end dot_matrix;
architecture Behavioral of dot_matrix is
signal row_count : std_logic_vector(2 downto 0);
signal counter : integer range 0 to 25000000 := 0; -- to divide the clock down
signal slow_clock : std_logic := '0';
begin
clockdiv1 : process(main_clk)
begin
if main_clk'event and main_clk = '1' then
if counter = 24999999 then
counter <= 0;
slow_clock <= not slow_clock;
else
counter <= counter + 1;
end if;
end if;
end process clockdiv1;
SM : process (slow_clock)
begin
if (slow_clock'event and slow_clock = '1') then
if (en = '1') then
if (row_count = "100") then
row_count <= "000";
else
row_count <= row_count + 1;
end if;
else
row_count <= "000";
end if;
end if;
end process SM;
DIS : process (row_count)
begin
if row_count = "000" then --1st clock count
col <= "01111"; --selecting 1st column
rows <= "1111111"; -- putting the data on the 1st column
elsif row_count = "001" then -- 2nd clock count
col <= "10111"; -- selecting 2nd column
rows <= "1001000";
row_count = "010" then -- 3rd clock count
col <= "11011"; -- selecting 3rd column
rows <= "1001100";
elsif row_count = "011" then -- 4th clock count
col <= "11101"; -- selecting 4th column
rows <= "1001010";
elsif row_count = "100" then -- 5th clock count
col <= "11110"; -- selecting 5th column
rows <= "0110001";
-- 1 1 1 1 0
-- 1 0 0 0 1
-- 1 0 0 0 1
-- 1 1 1 1 0
-- 1 0 1 0 0
-- 1 0 0 1 0
-- 1 0 0 0 1
end if;
end process DIS;
end Behavioral;
编辑：修复代码缩进后需要添加一些文本。