數(shù)字邏輯課程設(shè)計之電子琴

1、數(shù)字邏輯課程設(shè)計之電子琴實驗內(nèi)容：設(shè)計一個八音電子琴，能通過八個鍵進行手動控制音響，也可以通過自動控制有效自動播放一段音樂。實驗設(shè)計：本實驗分為四個模塊：一個模塊是主程序，一個模塊是自動播放音樂部分，一個模塊是音調(diào)發(fā)生器部分，一個模塊是數(shù)控分頻部分。通過接口和結(jié)構(gòu)體component的定義將各個模塊連接起來。本程序總的有11個輸入，1個輸出，2個輸入為時鐘脈沖，1個輸入是控制電子琴自動演奏或者手動演奏的使能端，8個輸入端為電子琴的八個鍵，1個輸出為揚聲器輸出音樂。在音調(diào)發(fā)生器部分中，需要按照模=50000/頻率的方法進行分頻，但是要達(dá)到提高音量使占空比為50%的效果還需要再對信號進行二分頻，因

2、此最后得到的音調(diào)發(fā)生器進行分頻預(yù)置值如下：音符 (C)1234567i頻率(Hz)262294330349392440494523模9585757163565047當(dāng)某位音符電平輸入有效時，對應(yīng)不同的分頻預(yù)置值，將分頻預(yù)置值輸出并作為數(shù)控分頻部分的輸入，分頻預(yù)置值控制對主頻的分頻。在數(shù)控分頻部分，將輸入的分頻預(yù)置值和時鐘脈沖作為輸入，最后輸出直接連接揚聲器。這一部分一共包含了兩個進程，第一個進程是根據(jù)不同音符的不同頻率進行在主頻下進行分頻，得到音符的相應(yīng)頻率，第二個進程是為了提高音量使占空比為50%而進行二分頻。在自動播放部分，1個時鐘脈沖輸入，1個自動播放的使能端輸入，還有8個音符的鍵為輸入

3、，輸出為音符對應(yīng)的8位高低電平，輸出連接到音調(diào)發(fā)生器的8位輸入，如果自動播放的使能端（auto）無效則進行手動操作，在手動操作下，該模塊的輸出直接為輸入。如果自動播放的使能端輸入有效，則播放事先存儲的一段音樂，首先將主頻50進行10000分頻，因此一個脈沖為.秒，每來一個脈沖進行計數(shù)并播放一個音符。直到設(shè)置的音符全部播放完畢，計數(shù)器回。源代碼：主模塊部分：定義了結(jié)構(gòu)體和各模塊函數(shù)library ieee;use ieee.std_logic_1164.all;use ieee.std_logic_arith.all;use ieee.std_logic_unsigned.all;entity

4、piano is port(clk0,clk1:in std_logic; auto:in std_logic; inplay:in std_logic_vector(7 downto 0); play:out std_logic); end piano;architecture run of piano is component autoplay is自動播放部分 port(A:in std_logic_vector(7 downto 0); B,C:in std_logic; D:out std_logic_vector(7 downto 0); end component; compon

5、ent tone is音調(diào)發(fā)生器部分 port(A:in std_logic_vector(7 downto 0); B:out integer range 0 to 170); end component; component control is數(shù)控分頻部分 port(A:in std_logic; B:in integer range 0 to 170; C:out std_logic); end component; signal sw0:std_logic_vector(7 downto 0);自動播放部分的輸出和音調(diào)發(fā)生器的輸入，表示八個音符 signal tone0:intege

6、r range 0 to 170;音調(diào)發(fā)生器的輸出和數(shù)控分頻部分的輸入，表示音符的頻率begin 在這個進程中把各個部分連接起來 G1:autoplay port map(A=>inplay,B=>auto,C=>clk0,D=>sw0); G2:tone port map(A=>sw0,B=>tone0); G3:control port map(A=>clk1,B=>tone0,C=>play);end run;自動播放模塊：library ieee;use ieee.std_logic_1164.all;use ieee.std_lo

7、gic_arith.all;use ieee.std_logic_unsigned.all;entity autoplay is port(A:in std_logic_vector(7 downto 0); -A=>inplay,B=>auto,C=>clk0,D=>sw0 B,C:in std_logic; D:out std_logic_vector(7 downto 0);end autoplay;architecture music of autoplay is signal clk2:std_logic; -對50脈沖進行分頻得到的的脈沖信號 signal

8、count0:integer range 0 to 62; -記錄自動播放的樂曲的脈沖并控制播放 signal count3:integer range 0 to 10000;-分頻時的計數(shù) begin separate:process(C,B)分頻將脈沖變?yōu)榈男盘?begin if B='0' then count3<=0;clk2<='0' elsif(C'event and C='1') then count3<=count3+1; if count3=5000 then clk2<='1'

9、elsif count3=10000 then clk2<='0'count3<=0; end if; end if; end process; half:process(clk2) begin if(clk2'event and clk2='1') then如果脈沖個數(shù)多于自動播放的音符，則計數(shù)器回，否則記錄第幾個脈沖 if count0=62 then count0<=0; else count0<=count0+1; end if; end if; end process; musicplay:process(C,B,A)

10、begin if B='1' then啟動自動播放后，在的脈沖下，每來一個脈沖相應(yīng)播放一個音符 case count0 is when 0 => D<="00010000" when 1 => D<="00000100" when 2 => D<="00000100" when 3 => D<="00000100" when 4 => D<="00001000" when 5 => D<="0000

11、0010" when 6 => D<="00000010" when 7 => D<="00000010" when 8 => D<="00000001" when 9 => D<="00000010" when 10 => D<="00000100" when 11 => D<="00001000" when 12 => D<="00010000" when 1

12、3 => D<="00010000" when 14 => D<="00010000" when 15 => D<="00010000" when 16 => D<="00010000" when 17 => D<="00000100" when 18 => D<="00000100" when 19 => D<="00001000" when 20 => D<

13、="00000010" when 21 => D<="00000010" when 22 => D<="00000010" when 23 => D<="00000001" when 24 => D<="00000100" when 25 => D<="00010000" when 26 => D<="00010000" when 27 => D<="000000

14、01" when 28 => D<="00000001" when 29 => D<="00000001" when 30 => D<="00000001" when 31 => D<="00000010" when 32 => D<="00000010" when 33 => D<="00000010" when 34 => D<="00000010" when

15、 35 => D<="00000010" when 36 => D<="00000100" when 37 => D<="00001000" when 38 => D<="00001000" when 39 => D<="00000100" when 40 => D<="00000100" when 41 => D<="00000100" when 42 => D&l

16、t;="00000100" when 43 => D<="00000100" when 44 => D<="00001000" when 45 => D<="00010000" when 46 => D<="00010000" when 47 => D<="00010000" when 48 => D<="00000100" when 49 => D<="0000

17、0100" when 50 => D<="00000100" when 51 => D<="00001000" when 52 => D<="00000010" when 53 => D<="00000010" when 54 => D<="00000010" when 55 => D<="00000001" when 56 => D<="00000100" wh

18、en 57 => D<="00010000" when 58 => D<="00010000" when 59 => D<="00000001" when 60 => D<="00000001" when 61 => D<="00000001" when 62 => D<="00000001" when others => null; end case; else D<=A;如果不進行自動播放

19、，則將輸入位音符直接輸出，并且不執(zhí)行前兩個進程的操作 end if; end process;end music;音調(diào)發(fā)生器模塊：library ieee;use ieee.std_logic_1164.all;use ieee.std_logic_arith.all;use ieee.std_logic_unsigned.all;entity tone is port(A:in std_logic_vector(7 downto 0);輸入的是位音符的電平 B:out integer range 0 to 170);輸出的是各音符對應(yīng)的模值end tone;architecture rtl

20、of tone isbegin search:process(A) begin case A is when "00000001" =>B<=95; when "00000010" =>B<=85; when "00000100" =>B<=75; when "00001000" =>B<=71; when "00010000" =>B<=63; when "00100000" =>B<=56; when

21、 "01000000" =>B<=50; when "10000000" =>B<=47; when others =>B<=170; end case; end process;end rtl;數(shù)控分頻模塊：library ieee;use ieee.std_logic_1164.all;use ieee.std_logic_arith.all;use ieee.std_logic_unsigned.all;entity control is port(A:in std_logic;時鐘信號 B:in integer

22、 range 0 to 170;各音符的模值 C:out std_logic);end control;architecture abc of control is signal spk:std_logic; begintwoclock:process(A,B)將各個音符按照不同的模值分頻得到各音符的頻率的倍 variable count1:integer range 0 to 170; begin if(A'event and A='1') then if count1=B then count1:=0;spk<='1' else count1:=count1+1;spk<='0' end if; end if; end process;reverse:process(spk)二分頻使占空比為并直接輸出 variable count2:std_logic; begin