VHDL鍵盤掃描

1、一、設計目的穩(wěn)固和運用所學課程，理論聯(lián)系實際，提高分析、解決計算機技術實際問題的獨立工作能力，通過對FPGA幾個簡單的模塊設計，進一步加深對計算機原理以及數(shù)字電路應用技術方面的了解與認識，進一步熟悉數(shù)字電路系統(tǒng)設計、制作與調(diào)試的方法和步驟。二、設計內(nèi)容1設計一個4×4的鍵盤掃描模塊，要求有防抖動功能。2用鍵盤控制16×16點陣LED顯示各種字符。3用鍵盤控制蜂鳴器發(fā)聲，能有各種音調(diào)。三、實現(xiàn)方法本系統(tǒng)的系統(tǒng)組成及連接原理如圖3.1所示，主系統(tǒng)由四個功能模塊組成：分頻模塊為鍵盤掃描模塊和提供時鐘、鍵盤掃描模塊、LED點陣模塊、發(fā)聲模塊。LED點陣發(fā)聲模塊鍵盤掃描模塊分頻模塊時

2、鐘輸入接蜂鳴器接LED點陣接鍵盤圖3.1整體模塊劃分1、分頻模塊分頻模塊的作用是把2MHZ的時鐘分成1kHZ和500HZ，為鍵盤掃描模塊和LED點陣模塊提供時鐘。主要方法是通過計數(shù)器實現(xiàn)分頻。分頻模塊如圖3.2，clk是輸入時鐘，clkout_kb是輸入給鍵盤掃描模塊使用，clkout_LED是輸入給LED點陣模塊使用。圖3.2 分頻模塊視圖其仿真結果如圖3.3圖 3.3分頻模塊仿真2、鍵盤掃描模塊2.1行列式鍵盤原理行列式鍵盤又叫做矩陣式鍵盤。用帶有I/O口的線組成行列結構，按鍵設置在行列的交點上。本次試驗用到的是4×4的行列結構鍵盤，可以構成16個按鍵。這樣，當按鍵數(shù)量平方增長是

3、，I/O口只是線性增長，這樣就可以節(jié)省I/O口。行列式鍵盤的原理如圖3.4所示。CDEF89AB45670123keyin上拉電阻keydrv圖 3.4 行列式鍵盤的原理按鍵設置在行列線交叉點，行、列線分別連接到按鍵開關的兩端。列線通過上拉電阻接+5V的電壓，即列線的輸出被嵌位在高電平狀態(tài)。判斷按鍵中有無鍵按下時通過行線輸入掃描信號，然后從列線讀取到狀態(tài)實現(xiàn)的。其方法是依次給行線送低電平，檢查列線的輸入。如果列線信號全為高電平，那么代表低電平所在的行中無按鍵按下；如果列線有輸入為低電平，那么低電平信號所在的行和出現(xiàn)低電平的列的交點處有按鍵按下。設行掃描信號為keydrv3keydrv0，列線按

4、鍵輸入信號keyin3keyin0與按鍵位置的關系如表3.1所示表3.1行掃描信號、列線按鍵輸入信號與按鍵位置的關系keydrv3keydrv0keyin3keyin0對應的按鍵111011100110111011201113110111104110151011601117101111108110191011A0111B01111110C1101D1011E0111F2.2鍵盤掃描系統(tǒng)模塊劃分4×4鍵盤鍵盤譯碼電路掃描電路按鍵去抖動電路時鐘輸入輸入鍵盤值圖3.5 鍵盤掃描系統(tǒng)模塊劃分鍵盤掃描電路時用于產(chǎn)生keydrv3-keydrv0信號，其變化順序為1110110110110111

5、周而復始的掃描。其停留在每個狀態(tài)的時間大約有10ms。掃描電路的模型如下：圖3.6 掃描電路外觀接口掃描電路的仿真如圖3.7所示：圖3.7 掃描電路仿真鍵盤譯碼電路是從keydrv3keydrv0和keyin3keyin0譯出按鍵值的電路，它的真值表如表1所示。鍵盤譯碼電路的模型如圖3.8所示：圖3.8 鍵盤譯碼電路外觀其中鍵值keycode用5位編碼，keycode為0000001111表示鍵值0F，keycode為11111時表示無按鍵按下。譯碼電路的仿真如圖3.9所示：圖3.9譯碼電路仿真圖3.9仿真的是掃描信號在keydrv=1011時有按鍵按下，并且keyin=0111時的鍵值，由表

6、1可知這時的鍵值因該是B，而由圖中可以看出仿真結果是5h0B，即預測結果與仿真結果一致。2.3 按鍵去抖動電路實現(xiàn)由于機械觸點的彈性作用,觸點在閉合和斷開瞬間的電接觸情況不穩(wěn)定,造成了電壓信號的抖動現(xiàn)象,如圖3.10所示。鍵的抖動時間一般為 510ms。這種現(xiàn)象會引起FPGA對于一次鍵操作進行屢次處理，因此須設法消除鍵接通或斷時的抖動現(xiàn)象。去抖動的方法有硬件和軟件兩種：硬件去抖動和軟件去抖動。圖3.10按鍵抖動現(xiàn)象去抖動模塊采用屢次連續(xù)檢測輸入鍵值的原理防抖。當檢測到有鍵值輸入時并不馬上輸出，而是當16次輸入的鍵值都一樣時才輸出，其中只要有一次鍵值不同的話計數(shù)器都會置零，重新記數(shù)。這樣就能消除

7、按鍵的抖動影響。其模塊外觀如圖3.11所示。圖3.11去抖動模塊外觀按鍵去抖動仿真：圖3.12按鍵去抖動仿真由仿真圖形可以看出，輸入keyvaluein開始和結束時都產(chǎn)生抖動，但經(jīng)過去抖模塊后抖動消失了。起到了去抖動的功能。3、16×16 LED 點陣顯示屏的設計3.1 16x16 LED點陣的工作原理及連接組成方式：16x16 LED點陣的工作原理同8x8 LED點陣的工作原理，圖3.13是8x8的LED點陣單色行共陽模塊的內(nèi)部結構圖，其單點工作電壓Uf為18 V，正向電流IF為810 mA。當某一行線為高電平而某一列線為低時，其行列交叉的點就被點亮；而當其某一列線為高時，其行列交

8、叉的點為暗；當某一行線為低電平時，無論列線如何，對應這一行的點全部為暗。圖3.13：8x8的LED點陣單色行共陽模塊的內(nèi)部結構圖本實驗采用的16x16 LED點陣用四個8x8點陣顯示構成，其連接方法如圖3.14所示。圖中，將(A)和(B)的8列、(C)和(D)的8列分別對應相連，同時將(A)和(C)的8行、 (B)和(D)的8行分別對應相連。即可形成一個16行(每一行有16個LED)、16列(每一列也有16個LED)的16x16點陣顯示器，可將這256個點稱為一頁，這樣，顯示字符時。只要對一頁中對應的亮滅進行控制即可。圖3.14：四個8x8點陣顯示構成的16x16 LED點陣3.2 16x16

9、 LED點陣的驅(qū)動方式本實驗采用動態(tài)掃描型驅(qū)動方式顯示，即顯示屏上的16行發(fā)光二極管共用一組列驅(qū)動存放器，然后通過行驅(qū)動管的分時工作，來使每行LED的點亮時間占總時間的116。只要每行的刷新速率大于50 Hz，利用人眼的視覺暫留效應，人們就可以看到一幅完整的文字或畫面。掃描驅(qū)動分行掃描驅(qū)動和列掃描驅(qū)動。由于16x16點陣顯示器有16行，故使用行掃描信號，本電路中參加了一個4-16線譯碼器，其輸入是一個頻率為1000Hz的時鐘信號，內(nèi)部采用4位二進制加法器，分別為00001111，然后使每種狀態(tài)只控制一路輸出，解碼輸出為低態(tài)掃描信號，即會有16路輸出。本實驗的列信號由事先存于存放器中的16進制碼

10、構成，每個矩陣表示一個字符的列掃描信號，伴隨行掃描信號進行交替的掃描，其設計圖見附錄中16x16 LED點陣掃描設計草圖。本實驗所顯示的字符由鍵盤編碼所確定，其編碼與顯示字符對應的關系如表3.2所示：表3.2：鍵盤編碼與對應顯示字符鍵盤編碼00000000010001000011顯示字符0123鍵盤編碼00100001010011000111顯示字符4567鍵盤編碼01000010010101001011顯示字符89AB鍵盤編碼01100011010111001111顯示字符CDEF鍵盤編碼11111顯示字符音符圖形3.3 16x16 LED點陣驅(qū)動電路16x16 LED點陣驅(qū)動外觀電路如圖3

11、.15所示：圖3.15 16x16 LED點陣驅(qū)動電路外觀16x16 LED點陣驅(qū)動電路原理圖如圖3.16所示：圖3.16：16x16 LED點陣驅(qū)動電路原理圖驅(qū)動行信號仿真如圖3.17所示：圖3.17驅(qū)動行信號4、發(fā)聲模塊4.1音調(diào)的產(chǎn)生音調(diào)的產(chǎn)生是通過分頻實現(xiàn)的。設計要求產(chǎn)生不同的音調(diào)，就需要不同的分頻器?？梢韵葮嬙煲粋€分頻器，然后通過VHDL中的參數(shù)傳遞語句構造出十二個不同的分頻器，其分頻數(shù)見表3.2輸入時鐘是2MHz。表3.3音符頻率對照表鍵值音符頻率分頻數(shù)鍵值音符頻率分頻數(shù)0低53925102.04087中57842551.02041低64404545.45458中68802272.

12、72732低74944048.5839中79882024.29153中15233824.0918A高110461912.04594中25783460.2076B高211751702.12775中36593034.9014C高313181517.45076中46982865.3295D高413971431.63924.2電路實現(xiàn)發(fā)聲模塊其內(nèi)部是一個有一個輸入，十二個輸出的分頻器，用于產(chǎn)生十二種音調(diào)。然后根據(jù)鍵值判斷哪個口輸出。其頂層視圖如圖3.18所示。圖3.18發(fā)聲模塊外觀發(fā)聲模塊的仿真見圖3.19圖3.19發(fā)聲模塊仿真仿真波形中l(wèi)5h4是分頻器的十二個輸出口，當鍵值是C時speaker輸入的

13、是h3的值，到達了要求。5、頂層模塊實現(xiàn)頂層電路只是把分頻模塊、鍵盤掃描模塊、LED點陣模塊和發(fā)聲模塊連接起來，其外觀和內(nèi)部結構如圖3.20和3.21所示。圖3.20頂層模塊外觀圖3.21頂層模塊內(nèi)部結構6、管腳的定義管腳的定義如表3.4所示表3.4 管腳的定義I/O NameI/O DirectionLocBankclkInputP3BANK7SpeakerOutputP95BANK4keydrv<0>OutputP120BANK3keydrv<1>OutputP121BANK3keydrv<2>OutputP122BANK3keydrv<3>

14、OutputP123BANK3keyin<0>InputP125BANK3keyin<1>InputP127BANK3keyin<2>InputP129BANK3keyin<3>InputP132BANK2LEDcolumn<0>OutputP133BANK2LEDcolumn<1>OutputP134BANK2LEDcolumn<2>OutputP136BANK2LEDcolumn<3>OutputP138BANK2LEDcolumn<4>OutputP139BANK2LEDcolum

15、n<5>OutputP140BANK2LEDcolumn<6>OutputP141BANK2LEDcolumn<7>OutputP147BANK2LEDcolumn<8>OutputP148BANK2LEDcolumn<9>OutputP149BANK2LEDcolumn<10>OutputP150BANK2LEDcolumn<11>OutputP151BANK2LEDcolumn<12>OutputP152BANK2LEDcolumn<13>OutputP162BANK1LEDcolu

16、mn<14>OutputP163BANK1LEDcolumn<15>OutputP164BANK1LEDrow<0>OutputP165BANK1LEDrow<1>OutputP167BANK1LEDrow<2>OutputP73BANK5LEDrow<3>OutputP74BANK5LEDrow<4>OutputP70BANK5LEDrow<5>OutputP71BANK5LEDrow<6>OutputP68BANK5LEDrow<7>OutputP69BANK5LEDro

17、w<8>OutputP63BANK5LEDrow<9>OutputP67BANK5LEDrow<10>OutputP61BANK5LEDrow<11>OutputP62BANK5LEDrow<12>OutputP59BANK5LEDrow<13>OutputP60BANK5LEDrow<14>OutputP57BANK5LEDrow<15>OutputP58BANK5附錄 程序代碼1、頂層模塊library IEEE;use IEEE.STD_LOGIC_1164.ALL;use IEEE.STD_

18、LOGIC_ARITH.ALL;use IEEE.STD_LOGIC_UNSIGNED.ALL;- Uncomment the following library declaration if instantiating- any Xilinx primitives in this code.-library UNISIM;-use UNISIM.VComponents.all;entity play_show is Port ( clk : in STD_LOGIC; keyin : in STD_LOGIC_VECTOR (3 downto 0); keydrv : out STD_LOG

19、IC_VECTOR (3 downto 0);LEDrow : out STD_LOGIC_VECTOR(15 downto 0);-LED行掃描信號 LEDcolumn : out STD_LOGIC_VECTOR(15 downto 0); Displayshow: out STD_LOGIC_VECTOR (6 downto 0); Displayselect: out STD_LOGIC_VECTOR (3 downto 0); speaker : out STD_LOGIC);end play_show;architecture rtl of play_show iscomponen

20、t freq_divisionPort ( clk:in STD_LOGIC; clkout_kb:out STD_LOGIC; clkout_LED:out STD_LOGIC; clkout_display:out std_logic);end component;component keyboardPort ( clk : in STD_LOGIC;-掃描時鐘，周期10ms keyin : in STD_LOGIC_VECTOR (3 downto 0); keydrv : out STD_LOGIC_VECTOR(3 downto 0); keyvalue : out STD_LOGI

21、C_VECTOR(4 downto 0);-輸出掃描信號end component;component LEDArrayPort ( clk : in STD_LOGIC;-時鐘信號,經(jīng)分燈韉玫1ms脈沖 keycode : in STD_LOGIC_VECTOR(4 downto 0);-鍵盤給的編碼 LEDrow : out STD_LOGIC_VECTOR(15 downto 0);-LED行掃描信號 LEDcolumn : out STD_LOGIC_VECTOR(15 downto 0)-LED列信號 );end component;component playport (clk:i

22、n STD_LOGIC;keyvalue:in STD_LOGIC_VECTOR(4 downto 0);speaker:out STD_LOGIC);end component;component IBUF port (I: in std_logic; O: out std_logic); end component;component Display Port ( Keyvalue : in STD_LOGIC_VECTOR (4 downto 0); clk: in STD_LOGIC; Display : out STD_LOGIC_VECTOR (6 downto 0); Disel

23、ect : out STD_LOGIC_VECTOR (3 downto 0);end component;-signal clkin:STD_LOGIC;signal clkout_kb,clkout_LED,clkout_display:STD_LOGIC;-signal keydrv1:STD_LOGIC_VECTOR (3 downto 0);signal keyvalue1:STD_LOGIC_VECTOR (4 downto 0);signal CLK_SIG: std_logic;begin-keydrv<=keydrv1;U1: IBUF port map (I =>

24、; clk, O => CLK_SIG);U2freq_division:freq_divisionport map(CLK_SIG,clkout_kb,clkout_LED,clkout_display);U3keyboard:keyboardport map(clkout_kb,keyin,keydrv,keyvalue1);U4LEDArray1616:LEDArrayport map(clkout_LED,keyvalue1,LEDrow,LEDcolumn);U5Uplay:playport map(CLK_SIG,keyvalue1,speaker);U6Display:Di

25、splayport map(keyvalue1,clkout_display,Displayshow,Displayselect);end rtl;2、分頻器entity fredivn isgeneric(N:integer:=2); Port ( clkin:in STD_LOGIC; clkout:out STD_LOGIC);end fredivn;architecture Behavioral of fredivn issignal clk1:std_logic:='0'signal counter:integer range 0 to n;beginprocess(

26、clkin)begin if rising_edge(clkin)then if counter=(n-1)/2 then clk1<=not clk1; counter<=0; else counter<=counter+1; end if; end if; end process;clkout<=clk1;end Behavioral;3、總分頻器entity freq_division isPort ( clk:in STD_LOGIC; clkout_kb:out STD_LOGIC; clkout_LED:out STD_LOGIC; clkout_displ

27、ay:out STD_LOGIC);end freq_division;architecture RTL of freq_division iscomponent fredivn isgeneric(N:positive); Port ( clkin:in STD_LOGIC; clkout:out STD_LOGIC);end component;beginU1:fredivngeneric map(N=>kb_N)port map(clk,clkout_kb);U2:fredivngeneric map(N=>LED_N)port map(clk,clkout_LED);U3:

28、fredivngeneric map(N=>display_N)port map(clk,clkout_display);end RTL;4、鍵盤掃描驅(qū)動entity keyscan is Port ( clkin : in STD_LOGIC;-掃描時鐘，周期20ms keydrv : out STD_LOGIC_VECTOR(3 downto 0);-輸出掃描信號end keyscan;architecture behavioral of keyscan issignal count : std_logic_vector(1 downto 0):="00"-計數(shù)器

29、信號beginprocess(clkin)beginif rising_edge(clkin) thenif count="11" thencount<="00"elsecount<=count+1;end if;end if;end process;process(count)begincase count iswhen "00"=>keydrv<="1110"when "01"=>keydrv<="1101"when "10&

30、quot;=>keydrv<="1011"when "11"=>keydrv<="0111"when others =>keydrv<="0000"end case;end process;end behavioral;5、鍵盤編碼entity keydecoder is Port ( clkin: in std_logic; keyin : in STD_LOGIC_VECTOR (3 downto 0); keydrv : in STD_LOGIC_VECTOR (3 dow

31、nto 0); keycode : out STD_LOGIC_VECTOR (4 downto 0); end keydecoder;architecture Rtl of keydecoder issignal temp:STD_LOGIC_VECTOR (7 downto 0);signal keyvalue1:STD_LOGIC_VECTOR (4 downto 0):="11111"signal count:std_logic_vector(1 downto 0):="00"-signal keypressed:boolean:=false;-

32、signal q1,q2,q3,q4:boolean;begintemp<=keydrv&keyin;process(clkin)beginif falling_edge(clkin) thenif keyin="1111" thenif count="11" thenkeyvalue1<="11111"count<="00"elsecount<=count+1;end if;elsecount<="00"case temp iswhen"1110

33、1110"=>keyvalue1<="00000"when"11101101"=>keyvalue1<="00001"when"11101011"=>keyvalue1<="00010"when"11100111"=>keyvalue1<="00011"when"11011110"=>keyvalue1<="00100"when"1101

34、1101"=>keyvalue1<="00101"when"11011011"=>keyvalue1<="00110"when"11010111"=>keyvalue1<="00111"when"10111110"=>keyvalue1<="01000"when"10111101"=>keyvalue1<="01001"when"1011

35、1011"=>keyvalue1<="01010"when"10110111"=>keyvalue1<="01011"when"01111110"=>keyvalue1<="01100"when"01111101"=>keyvalue1<="01101"when"01111011"=>keyvalue1<="01110"when"0111

36、0111"=>keyvalue1<="01111"when others =>keyvalue1<=keyvalue1;end case;end if;end if;end process;keycode<=keyvalue1;end rtl;6、鍵盤防抖entity Antiwitter is Port ( clkin : in STD_LOGIC; keyvaluein : in STD_LOGIC_VECTOR (4 downto 0); keyvalueout : out STD_LOGIC_VECTOR (4 downto

37、0);end Antiwitter;architecture Behavioral of Antiwitter issignal TempNum:std_logic_vector(4 downto 0);signal Counter:std_logic_vector(4 downto 0);signal Start:std_logic;beginprocess(clkin)beginif rising_edge(clkin) then if Start='0' thenTempNum<="11111"keyvalueout<="1111

38、1"Start<='1'elseif keyvaluein/=TempNum thenTempNum<=Keyvaluein;Counter<="00000"elseif Counter="11111" thenkeyvalueout<=keyvaluein;Counter<="00000"elseCounter<=Counter+1;end if;end if;end if;end if;end process;end Behavioral;7、鍵盤頂層entity ke

39、yboard isPort ( clk : in STD_LOGIC;-掃描時鐘，周期10ms keyin : in STD_LOGIC_VECTOR (3 downto 0); keydrv : out STD_LOGIC_VECTOR(3 downto 0); keyvalue : out STD_LOGIC_VECTOR(4 downto 0);-輸出掃描信號end keyboard;architecture RTL of keyboard iscomponent keyscanPort ( clkin : in STD_LOGIC;-掃描時鐘，周期10ms keydrv : out S

40、TD_LOGIC_VECTOR(3 downto 0);-輸出掃描信號end component;component keydecoderPort ( clkin:in std_logic; keyin : in STD_LOGIC_VECTOR (3 downto 0); keydrv : in STD_LOGIC_VECTOR (3 downto 0); keycode : out STD_LOGIC_VECTOR (4 downto 0);end component;component Antiwitter Port ( clkin : in STD_LOGIC; keyvaluein

41、: in STD_LOGIC_VECTOR (4 downto 0); keyvalueout : out STD_LOGIC_VECTOR (4 downto 0);end component;signal keydrv1:STD_LOGIC_VECTOR (3 downto 0);signal key:std_logic_vector(4 downto 0);beginU1:keyscanport map(clk,keydrv1);U2:keydecoderport map(clk,keyin,keydrv1,key);U3:Antiwitterport map(clk,key,keyva

42、lue);keydrv<=keydrv1;end RTL;8、LED掃描entity LEDArray is Port ( clk : in STD_LOGIC;-時鐘信號,經(jīng)分頻器得到1ms脈沖 keycode : in STD_LOGIC_VECTOR(4 downto 0);-鍵盤給的編碼 LEDrow : out STD_LOGIC_VECTOR(15 downto 0);-LED行掃描信號 LEDcolumn : out STD_LOGIC_VECTOR(15 downto 0)-LED列信號 );end LEDArray;architecture Scan of LEDArr

43、ay issignal count : std_logic_vector(3 downto 0):="0000"-計數(shù)器信號begin-時鐘信號觸發(fā)的計數(shù)器計數(shù)-process(clk)beginif rising_edge(clk) thenif count="1111" thencount<="0000"elsecount<=count+1;end if;end if;end process;-由count信號引發(fā)的行列掃描-process(count)begin-列信號-case count iswhen "

44、;0000"=>LEDrow<=x"8000"when "0001"=>LEDrow<=x"4000"when "0010"=>LEDrow<=x"2000"when "0011"=>LEDrow<=x"1000"when "0100"=>LEDrow<=x"0800"when "0101"=>LEDrow<=x&q

45、uot;0400"when "0110"=>LEDrow<=x"0200"when "0111"=>LEDrow<=x"0100"when "1000"=>LEDrow<=x"0080"when "1001"=>LEDrow<=x"0040"when "1010"=>LEDrow<=x"0020"when "1011&

46、quot;=>LEDrow<=x"0010"when "1100"=>LEDrow<=x"0008"when "1101"=>LEDrow<=x"0004"when "1110"=>LEDrow<=x"0002"when "1111"=>LEDrow<=x"0001"when others=>LEDrow<=x"0000"en

47、d case;-行信號-case keycode is-顯示0-when "00000"=>case count iswhen "0000"=>LEDcolumn<=x"03C0"when "0001"=>LEDcolumn<=x"07E0"when "0010"=>LEDcolumn<=x"0E70"when "0011"=>LEDcolumn<=x"0C30"

48、when "0100"=>LEDcolumn<=x"0C30"when "0101"=>LEDcolumn<=x"0C30"when "0110"=>LEDcolumn<=x"0C30"when "0111"=>LEDcolumn<=x"0C30"when "1000"=>LEDcolumn<=x"0C30"when "1001

49、"=>LEDcolumn<=x"0C30"when "1010"=>LEDcolumn<=x"0C30"when "1011"=>LEDcolumn<=x"0C30"when "1100"=>LEDcolumn<=x"0C30"when "1101"=>LEDcolumn<=x"0E70"when "1110"=>LEDc

50、olumn<=x"07E0"when "1111"=>LEDcolumn<=x"03C0"when others=>LEDcolumn<=x"0000"end case;-顯示1-when "00001" =>case count iswhen "0000"=>LEDcolumn<=x"0080"when "0001"=>LEDcolumn<=x"0180"

51、when "0010"=>LEDcolumn<=x"0780"when "0011"=>LEDcolumn<=x"0F80"when "0100"=>LEDcolumn<=x"0180"when "0101"=>LEDcolumn<=x"0180"when "0110"=>LEDcolumn<=x"0180"when "0111

52、"=>LEDcolumn<=x"0180"when "1000"=>LEDcolumn<=x"0180"when "1001"=>LEDcolumn<=x"0180"when "1010"=>LEDcolumn<=x"0180"when "1011"=>LEDcolumn<=x"0180"when "1100"=>LEDc

53、olumn<=x"0180"when "1101"=>LEDcolumn<=x"0180"when "1110"=>LEDcolumn<=x"0FF0"when "1111"=>LEDcolumn<=x"0FF0"when others=>LEDcolumn<=x"0000"end case;-顯示2-when "00010"=>case count isw

54、hen "0000"=>LEDcolumn<=x"03C0"when "0001"=>LEDcolumn<=x"07E0"when "0010"=>LEDcolumn<=x"0E70"when "0011"=>LEDcolumn<=x"0C30"when "0100"=>LEDcolumn<=x"0C30"when "0101&

55、quot;=>LEDcolumn<=x"0C30"when "0110"=>LEDcolumn<=x"0070"when "0111"=>LEDcolumn<=x"00E0"when "1000"=>LEDcolumn<=x"01C0"when "1001"=>LEDcolumn<=x"0380"when "1010"=>LEDco

56、lumn<=x"0700"when "1011"=>LEDcolumn<=x"0E00"when "1100"=>LEDcolumn<=x"0C00"when "1101"=>LEDcolumn<=x"0C00"when "1110"=>LEDcolumn<=x"0FF0"when "1111"=>LEDcolumn<=x"

57、;0FF0"when others=>LEDcolumn<=x"0000"end case;-顯示3-when "00011"=>case count iswhen "0000"=>LEDcolumn<=x"03C0"when "0001"=>LEDcolumn<=x"07E0"when "0010"=>LEDcolumn<=x"0E70"when "0011&q

58、uot;=>LEDcolumn<=x"0C30"when "0100"=>LEDcolumn<=x"0C30"when "0101"=>LEDcolumn<=x"0C70"when "0110"=>LEDcolumn<=x"00E0"when "0111"=>LEDcolumn<=x"01C0"when "1000"=>LEDcol

59、umn<=x"00E0"when "1001"=>LEDcolumn<=x"0070"when "1010"=>LEDcolumn<=x"0030"when "1011"=>LEDcolumn<=x"0C30"when "1100"=>LEDcolumn<=x"0C30"when "1101"=>LEDcolumn<=x"0E70"when "1110"=>LEDcolumn<=x"07E0"when "1111"=>LEDcolumn<=x"03C0"when others=>LEDcolumn<=x"0000&q