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library ieee; -- 庫的說明
use ieee.std_logic_1164.all; -- 程序包的說明
use ieee.std_logic_unsigned.all;
use ieee.std_logic_arith.all;
entity SDC is -- 實(shí)體
port(buttonclk:in std_logic; -- 按鍵時(shí)鐘信號
liftclk:in std_logic; -- 電梯時(shí)鐘信號
reset:in std_logic; -- 異步復(fù)位端口
f1upbutton:in std_logic; -- 一層上升請求端口
f2upbutton:in std_logic; -- 二層上升請求端口
f2dnbutton:in std_logic; -- 二層下降請求端口
f3dnbutton:in std_logic; -- 三層下降請求端口
fuplight:buffer std_logic_vector(3 downto 1); -- 上升請求寄存信號
fdnlight:buffer std_logic_vector(3 downto 1); -- 下降請求寄存信號
stop1button,stop2button,stop3button:in std_logic;-- 停站請求端口
stoplight:buffer std_logic_vector(3 downto 1); -- 停站請求寄存信號
position:buffer integer range 1 to 3;-- 電梯位置信號
doorlight:out std_logic; -- 開關(guān)門信號
udsig:buffer std_logic); -- 電梯模式（上升或下降）信號
end SDC;architecture art of SDC is -- 結(jié)構(gòu)體
type lift_state is -- 定義十個(gè)狀態(tài)
(stopon1,dooropen,doorclose,doorwait1,doorwait2,doorwait3,doorwait4,up,down,stop);
signal mylift:lift_state;
signal clearup:std_logic; -- 上升和停站請求清除信號
signal cleardn:std_logic; -- 下降和停站請求清除信號
begin
controlift:process(reset,liftclk) -- 狀態(tài)機(jī)進(jìn)程
variable pos:integer range 3 downto 1;
--******************************--
--**********電梯運(yùn)行控制*********--
--******************************--
begin
if reset='1' then
mylift <= stopon1; -- 異步復(fù)位，電梯的初始狀態(tài)為一層開門狀態(tài)
clearup <= '0';
cleardn <= '0';
pos:=1;
position<=1;
else if liftclk'event and liftclk='1'
then
case mylift is
when stopon1 => doorlight <= '0';position <= 1;pos:=1;
mylift <= doorwait1; -- 電梯等待 4s
when doorwait1 => mylift <=doorwait2;
when doorwait2 =>clearup<='0';cleardn<='0';mylift <=doorwait3;
when doorwait3 => mylift <=doorwait4;
when doorwait4 => mylift <= doorclose;
when doorclose => doorlight <= '1';-- 關(guān)門，判定電梯下一個(gè)運(yùn)行方式
if udsig='0' then -- 如果電梯處在上升模式
if position=3 then
if stoplight="111" and fuplight="111" and fdnlight="111" then-- 沒有請求信號時(shí)，電梯停在當(dāng)前層
udsig <= '1';
mylift <= doorclose;
elsif fdnlight(3)='0' or stoplight(3)='0' then-- 如果本層有請求信號時(shí)，電梯開門
udsig<='1';
mylift<=dooropen;
else --否則下降udsig<='1';
mylift<=down;
end if;
elsif position=2 then
if stoplight="111" and fuplight="111" and fdnlight="111" then
udsig<='0';
mylift<=doorclose;
elsif fuplight(2)='0' or stoplight(2)='0' then-- 本層有上升或停站請求時(shí)時(shí)，電梯開門
udsig<='0';
mylift<=dooropen;
elsif fuplight="111" and stoplight="111" and fdnlight="101" then--只有二層有下降請求時(shí)，電梯開門
udsig<='1';
mylift<=dooropen;
elsif stoplight(3)='0' or fdnlight(3)='0' then-- 三層有停站請求或下降請求，則上升
udsig<='0';
mylift<=up;
else udsig<='1';
mylift<=down;
end if;
elsif position=1 then
if stoplight="111" and fuplight="111" and fdnlight="111" then
udsig<='0';
mylift<=doorclose;
elsif stoplight(1)='0' or fuplight(1)='0' then
udsig<='0';
mylift<=dooropen;
else
udsig<='0';
mylift<=up;
end if;
end if;
elsif udsig='1' then-- 如果電梯處在下降模式
if position=1 then
if stoplight="111" and fuplight="111" and fdnlight="111" then
udsig<='0';
mylift<=doorclose;
elsif stoplight(1)='0' or fuplight(1)='0' then
udsig<='0';
mylift<=dooropen;
else udsig<='0';
mylift<=up;
end if;
elsif position=2 then
if stoplight="111" and fuplight="111" and fdnlight="111" then
udsig<='1';
mylift<=doorclose;
elsif fdnlight(2)='0' or stoplight(2)='0' then
udsig<='1';
mylift<=dooropen;
elsif fdnlight="111" and stoplight="111" and fuplight="101" then
udsig<='0';
mylift<=dooropen;
elsif stoplight(1)='0' or fuplight(1)='0' then
udsig<='1';
mylift<=down;
else udsig<='0';
mylift<=up;
end if;
elsif position=3 then
if stoplight="111" and fuplight="111" and fdnlight="111" then
udsig<='1';
mylift<=doorclose;
elsif fdnlight(3)='0' or stoplight(3)='0' then
udsig<='1';
mylift<=dooropen;
else udsig<='1';
mylift<=down;
end if;
end if;
end if;
--******************************--
--**********上升模式*************--
--******************************--
when up=> -- 電梯處于上升狀態(tài)
position<=position+1; -- 電梯樓層數(shù)加一
pos:=pos+1;
if pos <3 and (stoplight(pos)='0' or fuplight(pos)='0')
then
mylift <= stop; -- 電梯在一層或二層，本層有停站或上升請求時(shí)，則停止
elsif pos=3 and (stoplight(pos)='0' or fdnlight(pos)='0')
then
mylift <= stop; -- 電梯處在三層，并且有三層停站或下降請求，則停止
else
mylift <= doorclose;
end if;
--******************************--
--**********下降模式*************--
--******************************--
when down => -- 電梯處在下降狀態(tài)
position <=position-1;-- 電梯樓層數(shù)減一
pos:=pos-1;
if pos >1 and (stoplight(pos)='0' or fdnlight(pos)='0') then
mylift <= stop;elsif pos=1 and (stoplight(pos)='0' or fuplight(pos)='0') then
mylift <= stop;
else mylift <= doorclose;
end if;
when stop => mylift <= dooropen;
when dooropen => doorlight <= '0';
if udsig='0' then
if position<3 and (stoplight(pos)='0' or fuplight(pos)='0') then
clearup <= '1'; -- 清除當(dāng)前層上升和停站請求
else
clearup<='1';
cleardn<='1';
end if;
elsif udsig='1' then
if position >1 and (stoplight(pos)='0' or fdnlight(pos)='0') then
cleardn <= '1'; -- 清除當(dāng)前層下降和停站請求
else clearup <= '1';
cleardn <= '1';
end if;
end if;
mylift <= doorwait1; --狀態(tài)機(jī)復(fù)位
end case;end if;
end if;
end process controlift;
--******************************--
--****記憶電梯外各層停站請求******--
--******************************--
controlight:process(reset,buttonclk)
begin
if reset='1' then
stoplight <= "111";
fuplight <= "111";
fdnlight <= "111";
else
if buttonclk'event and buttonclk='1' then
if clearup='1' then -- 上升和停站請求清零
stoplight(position) <= '1';
fuplight(position) <= '1';
else if
f1upbutton='1' then
fuplight(1)<='0';
elsif f2upbutton='1' then
fuplight(2)<='0';
end if;
end if;
if cleardn='1' then stoplight(position) <= '1';
fdnlight(position) <= '1';
else if
f2dnbutton='1' then -- 記憶各層下降請求
fdnlight(2)<='0';
elsif f3dnbutton='1' then
fdnlight(3)<='0';
end if;
end if;
--******************************--
--*****記憶進(jìn)入電梯后各層停站請求**--
--******************************--
if stop1button='1' then
stoplight(1)<='0';
elsif stop2button='1' then
stoplight(2)<='0';
elsif stop3button='1' then
stoplight(3)<='0';
end if;
end if;
end if;
end process controlight;
end art;

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