VHDL语言-四层电梯.doc

library ieee;use ieee.std_logic_1164.all;use ieee.std_logic_arith.all;use ieee.std_logic_unsigned.all;entity elevator is -电梯外方向 PORT(clk1,clk2,start,reset,up1,up2,up3,down2,down3,down4,stop1,stop2,stop3,stop4: in std_logic; stoplight: buffer std_logic_vector(4 downto 1); uplight: buffer std_logic_vector(3 downto 1); downlight: buffer std_logic_vector(4 downto 2); position:buffer integer range 1 to 4; -电梯所在楼层 udsig:buffer std_logic; -指示方向 tdisplay:out std_logic_vector(4 downto 1); -12秒倒计时 setlight:out std_logic_vector(3 downto 1) -楼层设置 );end elevator;architecture lift of elevator istype state_type is(stopat1,dclose,wait1,wait2,wait3,wait4,wait5,wait6,wait7,wait8, swup2,swup3,swup4,swup5, swdn2,swdn3,swdn4,swdn5, up,down,stop,stopq);signal state:state_type;signal clearup,cleardown:std_logic;begin zt:process(clk2,reset)variable pos: std_logic_vector(1 downto 0);beginif reset=1 then state=stopat1;position=1;pos:=00;clearup=0;cleardownstate=wait1;udsigstate=wait2;tdisplay=1000; if start=1 then state=dclose;elsif uplight(position)=1 or downlight(position)=1 then state=wait1;clearup=1;cleardownstate=wait3;tdisplay=0111;clearup=0;cleardown=0; if start=1 then state=dclose;elsif uplight(position)=1 or downlight(position)=1 then state=wait1;clearup=1;cleardownstate=wait4;tdisplay=0110; if start=1 then state=dclose;elsif uplight(position)=1 or downlight(position)=1 then state=wait1;clearup=1;cleardownstate=wait5;tdisplay=0101; if start=1 then state=dclose;elsif uplight(position)=1 or downlight(position)=1 then state=wait1;clearup=1;cleardownstate=wait6;tdisplay=0100; if start=1 then state=dclose;elsif uplight(position)=1 or downlight(position)=1 then state=wait1;clearup=1;cleardownstate=wait7;tdisplay=0011; if start=1 then state=dclose;elsif uplight(position)=1 or downlight(position)=1 then state=wait1;clearup=1;cleardownstate=wait8;tdisplay=0010; if start=1 then state=dclose;elsif uplight(position)=1 or downlight(position)=1 then state=wait1;clearup=1;cleardownstate=dclose;tdisplayif udsig=0 then -上升情况if position=4 then -电梯在四楼if stoplight=0000and uplight=000and downlight=000 thenudsig=1;state=dclose;elsif downlight(4)=1thenstate=stopq;else udsig=1;state=down;end if;elsif position=3 then -电梯在三楼if stoplight=0000and uplight=000and downlight=000 thenudsig=0;state=dclose;elsif stoplight(4)=1 or downlight(4)=1 thenudsig=0;state=up;elsif uplight(3)=1thenstate=stop;elsif downlight(3)=1thenstate=stopq;elseudsig=1;state=down;end if;elsif position=2 then -电梯在二楼if stoplight=0000and uplight=000and downlight=000 thenudsig=0;state=dclose;elsif stoplight(3)=1or uplight(3)=1or stoplight(4)=1or downlight(4)=1 thenudsig=0;state=up;elsif uplight(2)=1thenstate=stop;elsif downlight(2)=1thenstate=stopq; elseudsig=1;state=down;end if;elsif position=1 then -电梯在一楼if stoplight=0000and uplight=000and downlight=000 thenudsig=0;state=dclose;elsif uplight(1)=1thenstate=stop;elseudsig=0;state=up;end if;end if;elsif udsig=1 then -下降情况if position=1 then -电梯在一楼if stoplight=0000and uplight=000and downlight=000 thenudsig=0;state=dclose;elsif uplight(1)=1thenstate=stop;elseudsig=0;state=up;end if;elsif position=2 then -电梯在二楼if stoplight=0000and uplight=000and downlight=000 thenudsig=1;state=dclose;elsif stoplight(1)=1or uplight(1)=1 thenudsig=1;state=down;elsif uplight(2)=1thenstate=stop;elsif downlight(2)=1thenstate=stopq;else udsig=0;state=up;end if;elsif position=3 then -电梯在三楼if stoplight=0000and uplight=000and downlight=000 thenudsig=1;state=dclose;elsif stoplight(2)=1or downlight(2)=1or stoplight(1)=1or uplight(1)=1 thenudsig=1;state=down;elsif uplight(3)=1thenstate=stop;elsif downlight(3)=1thenstate=stopq;elseudsig=0;state=up;end if;elsif position=4 then -电梯在四楼if stoplight=0000and uplight=000and downlight=000 thenudsig=1;state=dclose;elsif downlight(4)=1thenstate=stopq;elseudsig=1;statestate=swup5;tdisplaystate=swup4;tdisplaystate=swup3;tdisplaystate=swup2;tdisplaytdisplay=0001;-显示1if pos=00 then position=2;pos:=01;-显示第2层elsif pos=01 then position=3;pos:=10;-显示第3层elsif pos=10 then position=4;pos:=11;-显示第4层end if; if pos=01 and stoplight(2)=0and uplight(2)=0and(stoplight(3)=1or uplight(3)=1or stoplight(4)=1or downlight(4)=1)thenstate=up;elsif pos=10 and stoplight(3)=0and uplight(3)=0and(stoplight(4)=1or downlight(4)=1) thenstate=up;elsif pos=11 thenstate=stopq;elsestatestate=swdn5;tdisplaystate=swdn4;tdisplaystate=swdn3;tdisplaystate=swdn2;tdisplaytdisplay=0001;-显示1if pos=01 then position=1;pos:=00;-显示第1层elsif pos=10 then position=2;pos:=01;-显示第2层elsif pos=11 then position=3;pos:=10;-显示第3层end if; if pos=10 and stoplight(3)=0 and downlight(3)=0and(stoplight(2)=1or downlight(2)=1or stoplight(1)=1or uplight(1)=1) thenstate=down;elsif pos=01 and stoplight(2)=0 and downlight(2)=0and(stoplight(1)=1or uplight(1)=1) thenstate=down;elsif pos=00thenstate=stop;elsestateclearup=1;statecleardown=1;statestate=stopat1;end case;end if;end process zt;sr:process(clk1)beginif reset=1 thenstoplight=0000;uplight=000;downlight=000;setlight=000;elsif ( clk1=1 and clk1EVENT) then if clearup=1 thenstoplight(position)=0;uplight(position)=0;elseif up1=1then uplight(1)=1;setlight=001;end if;if up2=1then uplight(2)=1;setlight=010;end if;if up3=1then uplight(3)=1;setlight=011;end if;end if;if cleardown=1 thenstoplight(position)=0;downlight(position)=0;elseif down2=1then downlight(2)=1;setlight=010;end if;if down3=1then downlight(3)=1;setlight=011;end if;if down4=