作為一個菜鳥我很愿意分享下我做的一些小東西，記得一年前好像少幾天吧，看記錄是2009年5月19日
我用51單片機做數字鐘的情景，那個時候用匯編，焦頭爛額，做了三天，還請教了老師。
哎，現在都已經用C了，而且重心已經放在了AVR上，
不過想想，這一年我還是學了很多東西，至少不是虛度了這一年。
FPGA是挺好玩的，不過沒有時間搞，忙著比賽。
不過憑借著學期前兩個禮拜實習天天晚上去圖書館自學VHDL的基礎，加上單片機的基礎，一直活到現在。呵呵呵
臭屁一下，今天老師說我可以做他的助教，確實把我興奮了一把，
其實我一直很心虛，因為都沒有時間搞，哪天出個難題答不上來就糗了。
今天中午和下午花了6個小時左右的時間做了一個數字鐘，
VHDL語言（Very high speed integrated circuit Hardware Description Language）即超高速集成電路硬件描述語言。
顧名思義既然是硬件描述，當然是描述硬件，這個語言相當于在FPGA或CPLD芯片里熔出一個數字電路。
硬件FPGA 芯片是ALTERA公司Cyclone II 系列的EP2C35F672C6
使用的是ALTERA公司的開發板，型號DE2來張全圖，軟件為Quartus II 8.0,、ALTERA公司為自己產品打造的開發軟件。
據說是5000塊錢，因為是學校教學用，批量買，2500塊錢（不過我看下，就芯片貴，我看這個板子人家至少賺了1000多），我原來以為老師不會借，不過他似乎不介意，倒是他主動借給我的，額。。。
不費話了，貼程序吧
library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_unsigned.all;
entity fpq is
port(clk : in std_logic;
k : in std_logic;
k1 : in std_logic;
k2 : in std_logic;
ge : out std_logic_vector(0 to 6);
shi : out std_logic_vector(0 to 6);
feng : out std_logic_vector(0 to 6);
fens : out std_logic_vector(0 to 6);
shig : out std_logic_vector(0 to 6);
shis : out std_logic_vector(0 to 6));
end fpq;
architecture first of fpq is
signal clock : integer range 0 to 24999999;
signal ge_t : integer range 0 to 9;
signal shi_t : integer range 0 to 5;
signal feng_t : integer range 0 to 9;
signal fens_t : integer range 0 to 5;
signal shig_t : integer range 0 to 9;
signal shis_t : integer range 0 to 2;
signal temp : integer range 0 to 9;
begin
t0: process(clk)
begin
if (clk'event and clk='1') then
clock <= clock + 1;
if clock = 24999999 then
---------------------------------------------
if k='0' then
---------------------------------------------
if ge_t = 9 then
ge_t <= 0;
if shi_t = 5 and ge_t = 9 then
shi_t <= 0;
if feng_t = 9 and shi_t = 5 then
feng_t <= 0;
if fens_t = 5 and feng_t = 9 then
fens_t <= 0;
if shis_t = 2 and shig_t = 3 and fens_t = 5 then
shig_t <= 0;
if shis_t = 2 and shig_t = 3 then
shis_t <= 0;
else
shis_t <= shis_t + 1;
end if;
else
if shig_t = 9 and fens_t = 5 then
shig_t <= 0;
else
shig_t <= shig_t +1;
end if;
end if;
else
fens_t <= fens_t + 1;
end if;
else
feng_t <= feng_t + 1;
end if;
else
shi_t <= shi_t + 1;
end if;
else
ge_t <= ge_t + 1;
end if;
else
if k1='0' then
if feng_t = 9 then
feng_t <= 0;
if fens_t = 5 then
fens_t <= 0;
else
fens_t <= fens_t + 1;
end if;
else
feng_t <= feng_t + 1;
end if;
end if;
if k2='0' then
if shig_t = 3 and shis_t = 2 then
shig_t <= 0;
shis_t <= 0;
else
if shig_t = 9 then
shig_t <= 0;
if shis_t = 2 then
shis_t <= 0;
else
shis_t <= shis_t + 1;
end if;
else
shig_t <= shig_t + 1;
end if;
end if;
end if;
end if;
------------------------------------------------
end if;
end if;
------------------------------------------------
end process t0;
c: process(clk,ge_t,shi_t,feng_t,fens_t,shig_t,shis_t)
begin
case ge_t is
when 9 => ge <= "0000100";
when 8 => ge <= "0000000";
when 7 => ge <= "0001111";
when 6 => ge <= "0100000";
when 5 => ge <= "0100100";
when 4 => ge <= "1001100";
when 3 => ge <= "0000110";
when 2 => ge <= "0010010";
when 1 => ge <= "1001111";
when 0 => ge <= "0000001";
end case;
case shi_t is
when 5 => shi <= "0100100";
when 4 => shi <= "1001100";
when 3 => shi <= "0000110";
when 2 => shi <= "0010010";
when 1 => shi <= "1001111";
when 0 => shi <= "0000001";
end case;
case feng_t is
when 9 => feng <= "0000100";
when 8 => feng <= "0000000";
when 7 => feng <= "0001111";
when 6 => feng <= "0100000";
when 5 => feng <= "0100100";
when 4 => feng <= "1001100";
when 3 => feng <= "0000110";
when 2 => feng <= "0010010";
when 1 => feng <= "1001111";
when 0 => feng <= "0000001";
end case;
case fens_t is
when 5 => fens <= "0100100";
when 4 => fens <= "1001100";
when 3 => fens <= "0000110";
when 2 => fens <= "0010010";
when 1 => fens <= "1001111";
when 0 => fens <= "0000001";
end case;
case shig_t is
when 9 => shig <= "0000100";
when 8 => shig <= "0000000";
when 7 => shig <= "0001111";
when 6 => shig <= "0100000";
when 5 => shig <= "0100100";
when 4 => shig <= "1001100";
when 3 => shig <= "0000110";
when 2 => shig <= "0010010";
when 1 => shig <= "1001111";
when 0 => shig <= "0000001";
end case;
case shis_t is
when 2 => shis <= "0010010";
when 1 => shis <= "1001111";
when 0 => shis <= "0000001";
end case;
end process c;
end first;
和匯編有的一拼啊，呵呵，由于是新手，所以很多程序都帶有單片機的想法，其實VHDL和C、FPGA和單片機是兩種不同的語言、芯片，主要是要有并行思想和狀態機的概念，很遺憾我現在好像都沒有。
設置模式開關是sw01.、分鐘設置按鈕key01、key02 。
視頻地址：http://v.youku.com/v_show/id_XMTcxMTMzODYw.html 不過很糊啊。。悲劇。
后記：臭屁一下