[kinco]

作者: 飛鳥

步進馬達有分1,2,4,5,6相激磁

算法都不一樣，不知道你是不是要問這個

http://jade.ee.hit.edu.tw/eclass/sim...F%E7%90%86.htm

因為小弟是第一次接觸這個~非常的不懂...
教授說要用VHDL去做~
以下是VHDL的編碼~
請問飛鳥大有可以參考的東西嗎?謝謝

-------------------------------------------------------------------
--實驗名稱：步進馬達實習
--檔案名稱：stepmotor_speed.vhd
--功    能：步進馬達轉速控制
--日    期：2003.8.8
-------------------------------------------------------------------
library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_unsigned.all;
use ieee.std_logic_arith.all;

entity stepmotor_speed is
port(
      clk : in std_logic;
      spd : in std_logic_vector(3 downto 0);
      step: out std_logic_vector(3 downto 0)
    ); 
end stepmotor_speed;

architecture arch of stepmotor_speed is
  signal buf: std_logic_vector (4 downto 0);
  signal dly : std_logic;
  signal clk_new: std_logic;
  signal cnt : std_logic_vector(1 downto 0);
begin
---------- process ---------
  process(clk)
  begin
    if clk'event and clk='1' then
      dly <= buf(4);
      buf <= buf +('0' & spd);
    end if;
  end process;

  clk_new<=buf(4) xor dly;

  process(clk_new)
  begin
    if clk_new'event and clk_new='1' then
        cnt <= cnt+1;
    end if;
  end process;

  step <= "1000" when cnt=0 else
          "0100" when cnt=1 else
          "0010" when cnt=2 else
          "0001";
end arch;