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各位先進們,老師最近派了一個鍵盤掃描題目給我們寫,硬體架構和老師發的一些資料都在附件中,我有寫出來兩個程式,一個是用Mealy狀態機防彈跳和看書說故事的寫法,不過我很討厭Mealy狀態機和看書說故事,所以我又寫了第二個寫法,用旗標交握以及計數器防彈跳,因為班上沒人寫出來,所以才在這裡發帖,主要想看先進們的邏輯寫法,以下是我的程式,寫的邏輯很爛可以噹我沒關係,呵呵...因為小弟弟剛升會員,所以只有1RDB,希望先進們見諒.& K' [8 H2 g/ I9 V( S; w
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Library ieee;' [7 b2 D0 m1 `3 r+ H
Use ieee.std_logic_1164.all;$ B8 k% K$ ~3 A1 A7 l: Y' t
Use ieee.std_logic_unsigned.all;
7 Z; v0 `; V2 k9 X$ l0 C# M
8 j1 ~- n4 U, u" P( BEntity Keyboard_scanning_2 is p V% I9 ~" {% i3 Y F6 ?/ c
Port(5 X8 f9 y( c% k+ @4 q) Z
clk,c1,c2,p_21 : in std_logic;3 B y' _4 d$ e: W
kbi : in std_logic_vector(2 downto 0);
8 B# d8 ^0 b2 h7 V U9 h lt,p_20,p_6 : out std_logic;
8 n- [ X+ h3 q. V6 N3 R( Q kscano,key : out std_logic_vector(3 downto 0));2 s1 d/ ^6 }1 Q: V& Q" @0 D+ L2 J
end Keyboard_scanning_2;
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L) ]4 z/ @3 U; GArchitecture K_S of Keyboard_scanning_2 is% J4 C. Y% d, {
signal x0,x1,x2,x3,ena,l_p,d_b,count : std_logic;% j/ l% s+ m' t2 r. i/ ^& {/ K
signal D : std_logic_vector(1 downto 0);' h2 |% u* i$ P" g G4 i3 e
signal ks1,kok : boolean;
1 E" O& D/ H% L( T! j, S* P# [$ @Begin
# ?: Q* R; T' t! alt<=c1 nor c2;
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freqprocess(clk)
7 ^$ C6 O) N! j# q8 V Q: H2 @; @/ Qvariable ff : std_logic_vector(16 downto 0);
# o6 i$ a& _* H6 t( ZBegin7 o, J: T1 y1 F: A, Y& y: n
if (clk'event and clk='1') then/ L/ B7 |+ w0 J" F8 X! q
ff:=ff+1;
, I& l ` n* ?0 A end if;. R S7 W" u8 I0 r
l_p<=ff(12);
' l! ]5 i! v8 {* I) d5 H% k; v d_b<=ff(13);
( R8 P5 J* |# t' G# h4 b count<=ff(15);
3 }; ~- b7 S1 ^3 \( h: R- mend process freqp;& |7 p; \6 K9 Y1 a! t" T! y) U
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debrocess(d_b)
3 D. X1 o+ d- I. f1 G$ {4 {! evariable c : std_logic_vector(1 downto 0);
; E+ N5 w1 T2 z5 w9 `Begin( Y) }: z1 \ b4 k/ f: F% y
if (d_b'event and d_b='1') then1 U) D8 t/ L4 C. `. t
if (kbi(2) or kbi(1)or kbi(0))='1' then
* {; q; k0 b8 B( \ if c="11" then1 C7 D& u/ X% w; y4 L
ena<='1';
% z" U* f( t* c9 ^& m/ d* Q1 L x2<=kbi(1);
U5 @3 `1 r2 s% v1 Q x3<=kbi(0);
5 A |/ }/ V" ` kok<=false;
7 N' p' O2 a' T, }* N6 @7 L9 ?; v else 9 |: Q9 G+ H, f. o$ s8 ~5 H
c:=c+1;+ ~! `. K5 G3 y& y
end if;/ K( R) D) m! G5 ?+ W
elsif (kbi(2) or kbi(1)or kbi(0))='0' then- R& r! n) T+ |) t( r
ena<='0';% r9 `+ |( o! x3 G. m4 w- @2 x
kok<=true;
$ \0 w3 i' V9 c c:="00";
, q$ r$ F0 \/ k0 ?. _9 ?8 `9 y end if;
, m8 m% o; h* k end if;
) L/ l3 O$ u4 n6 I# ~) N, \end process deb;; |; Z3 @- p9 @: l' O6 V- ~$ Q
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counter_scanrocess(count)- Y3 w- l5 A/ b5 Y+ ?
Begin# K5 ?0 T P' a; ?# b+ D
if (count'event and count='1') then0 x; g# J& F& M
if ena='1' then( D( B2 {5 a: s# Q
x1<=D(1);
2 y; N7 D4 N; e# P x0<=D(0);" j6 Z/ V% z! c4 }, R/ M7 R+ N
else7 b3 V* ?4 d% F! Z; N
if D="11" then
- P0 H' n! r3 ]4 z% k- \' E D<="00"; ?& D2 n/ D- r
else 9 l( u/ j* B* e; d$ g( c
D<=D+1;' ?1 \# d) Y' U, h |
end if;' L+ {9 E1 c* c5 l+ `& l0 `. `
end if;0 f6 j5 f# Q! z
end if;
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when "00"=>
5 j8 h7 [# g" u9 Q/ b' D0 l5 H' n kscano<="0001";
4 I# `, e: I7 U" Z/ n3 ]* x7 q when "01"=>
( @6 ]% ^+ m( o. t, |7 L! n% ]: u kscano<="0010"; . f2 j- |% n# r
when "10"=>+ ?$ ?& b9 h8 r8 p2 i- S) C
kscano<="0100";
" A8 Y& q. O9 R" f2 f4 L; e when "11"=>
! x, @: k' b- P5 H kscano<="1000";
& s& d5 r |+ ?1 P+ k when others=>null;
" M5 |/ X5 a7 \7 @: C6 C9 _7 J3 U end case; & }" d- S: m8 l6 V
end process counter_scan;
% `. J3 R F) C) s9 E
8 M. J& x l0 X3 o$ O) Y6 z7 bld_plsrocess(l_p)
2 h; m$ {0 T) K& h, a- `2 s; U8 \: ~Begin0 V- j& C6 N5 y' o
if (l_p'event and l_p='1') then
+ N$ \& p7 ~3 J2 {8 | if ena='1' then( O2 B. C# v# h+ ~6 B7 c" l
if ks1 then1 N5 ?, \6 d: y7 X
p_6<='1';2 K: Y. M) u! {3 r* c S$ i
p_20<='0';
* U" P% J0 h3 p9 s4 D) X5 c* z* w ks1<=false;
. C: t+ x* n. p2 s- c elsif ks1=false then
! O4 v% E k1 z4 h7 P p_6<='0';
+ u. r9 u D. a if p_21='1' then
4 ~& l: D5 C4 r8 J p_20<='1';
3 M/ y8 B- u* j# u* a4 {. Q key(3)<=x3;6 P; r2 u$ E( b6 B4 F9 ?: `( l( J
key(2)<=x2;! z4 P; t0 X, ]2 m s0 ?
key(1)<=x1;
9 z6 u3 J4 O: i3 E" d) O# w key(0)<=x0;
) a7 ]7 H9 i0 C6 ~: u; `, Y8 S6 ?9 I/ y else
$ |; R4 u! U; y& B) Z3 @1 ?% u& l, Q; e p_20<='0';4 D7 S! x, V0 S3 Q! S
end if;4 f' V1 o5 P' v u
end if;
. R! n2 o( Y5 L! Q4 Z3 t& ]. C' G* h elsif kok then
# j7 B1 w4 ?. m# T$ b ks1<=true;
# Q& H3 ^. R3 l& F9 V3 L! y4 |- x end if;
n* ]" K% _9 c% h7 }* |) X end if;
4 J( H) T2 {3 F8 Fend process ld_pls;
' A3 D. \& O5 kend K_S; |
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