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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.
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' U$ v0 P. O* @9 s+ M( k1 [Library ieee;! r. G6 F R- v1 w, D$ H" ~
Use ieee.std_logic_1164.all;3 E6 c9 ~, {; u
Use ieee.std_logic_unsigned.all;
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! |- Q2 I1 A9 q. b+ _Entity Keyboard_scanning_2 is; G4 V9 I( L$ X7 b+ o' N1 K9 K
Port(" W/ j) U2 {1 z* [- ^0 z1 F
clk,c1,c2,p_21 : in std_logic;3 k* e. y* L0 `' G! s* V( `
kbi : in std_logic_vector(2 downto 0);7 ?+ X5 v8 ?( X: x L; z, Q
lt,p_20,p_6 : out std_logic;. `6 ~! p1 v9 ]4 R$ O: H
kscano,key : out std_logic_vector(3 downto 0)); k) @6 T$ S" X
end Keyboard_scanning_2;
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Architecture K_S of Keyboard_scanning_2 is
3 |+ B! w! g+ e: m S& W* dsignal x0,x1,x2,x3,ena,l_p,d_b,count : std_logic;3 E5 }* `& R8 I3 A$ ~
signal D : std_logic_vector(1 downto 0);& G, I/ p) E5 |* L5 {) M6 o
signal ks1,kok : boolean;
3 O8 N1 O }+ A9 SBegin/ c7 y# ~) e) c5 p8 I% w0 O
lt<=c1 nor c2;& b0 U- K0 i$ b7 h9 w! N
4 R+ o, S) a1 J/ V: p; `9 w/ l4 G
freqprocess(clk)
1 f2 k7 ]/ E% \; A: A" L kvariable ff : std_logic_vector(16 downto 0); : m0 @3 h" `* A3 a6 ]
Begin
0 x/ T1 \ S. {. @ if (clk'event and clk='1') then0 @# i* f3 P6 a3 ^ _0 S
ff:=ff+1;
) R, n3 d' @, @3 @: F end if;& A5 x, Z5 j; Q7 b
l_p<=ff(12);
/ M- r$ [# F9 N; m; e9 L( h- [, ]) p d_b<=ff(13);
/ {' P$ m( h4 O5 u7 v! V count<=ff(15);
+ ~9 F" ^3 A4 Jend process freqp;
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debrocess(d_b)# ~! V. ]' g! ]
variable c : std_logic_vector(1 downto 0);/ W0 s: g' ~ Z$ ? i! R
Begin* {: A$ b' v# O" n1 t: M% ?
if (d_b'event and d_b='1') then& A& N) ?5 L9 i r* u6 d
if (kbi(2) or kbi(1)or kbi(0))='1' then
# [4 s' _- X8 N6 @$ l if c="11" then
) e- v0 w" b ~0 Z: ? ena<='1';
+ R0 Z* h2 `& S* i x2<=kbi(1);+ @& W2 H$ x/ P+ a
x3<=kbi(0);
; U2 q( q% k r) t9 e4 S9 {, ^ kok<=false;
# P; q& D# m+ W$ a ? else $ W, z6 m9 U. u: ?/ a
c:=c+1;) ~3 z- C2 z% q$ F* B+ _6 X
end if;
3 J$ X+ }. d/ G0 X$ ^ elsif (kbi(2) or kbi(1)or kbi(0))='0' then+ W' r. Y- O2 ~3 o! t' Q( ]
ena<='0';7 ^- {4 C+ @1 x7 m# y9 K& t: c
kok<=true; i- N2 e- h) `' q6 R
c:="00"; * X6 _# N4 j, I
end if;
! o: Y6 y/ n1 Z end if;
* R6 X2 ?) v0 D* h- fend process deb;0 P3 J& h' R* }& u
5 i; p8 |* c- r) H4 j% ^6 hcounter_scanrocess(count)
$ l7 h4 F `+ tBegin
# X- p4 E- K, |$ B+ Z U: a5 f if (count'event and count='1') then, O$ `: l. e3 A* _; S
if ena='1' then. e+ B4 n' ?/ L
x1<=D(1);1 N5 f# t! q- V( Q8 e
x0<=D(0);
2 s2 i7 a: ?9 C5 J0 H4 \6 t( W2 @ else
/ ~9 N& V0 Z$ x if D="11" then4 [, s, @7 j% m4 t! l% t; Q
D<="00";+ V9 R. t# K/ N" R3 x# ^
else
- D/ h) F: j G( a1 V5 l n+ C D<=D+1;
& D9 g9 [# ]2 T: E. o end if;
. v/ T! i) M! [+ p% h end if;
5 y i3 ?( M* w! v end if;0 H, V6 l6 ]* R6 S$ R8 T: b
case D is
! d: x# _% {$ o$ G when "00"=>! B4 ~' s: }3 ^9 s _
kscano<="0001";! z2 A, R( s ?% e6 T: B
when "01"=>0 G( i' J! `8 v! S1 m% e0 \" [+ v# A( Y3 R
kscano<="0010"; 2 @& o8 D0 x J0 k( }' O- Z
when "10"=>$ k( ^/ h+ u" T% b
kscano<="0100"; * |2 I( S$ \5 c: L6 ~( S
when "11"=>
( r& E5 ~5 j0 S" z8 H) G u. Y kscano<="1000";) b7 e( \) w: w
when others=>null;
( b7 p K+ j+ Z" f; ~5 p end case; 0 N# e3 {' l9 |" t3 j
end process counter_scan;+ @ r8 u* T6 M Q0 \
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ld_plsrocess(l_p)
4 a8 {1 b* x! t. J J7 O9 l8 MBegin/ R; g2 }7 i+ P, \
if (l_p'event and l_p='1') then
; t' S4 y9 O) F, t/ T) L( c if ena='1' then
5 p+ `7 O# h6 w8 \. o5 O: U- u. V if ks1 then
2 J& M. Z( B) g8 a p_6<='1';! k' C. a2 v$ A
p_20<='0';
8 z5 E- j$ S9 Y s. h ks1<=false;
: |/ j4 k4 P+ M |! k elsif ks1=false then
. y! b& b/ ?! o p_6<='0';
3 H. b5 G4 p1 Q& p6 C H if p_21='1' then( P# D& u3 ?6 h, Z- I; Y+ q
p_20<='1';
9 L8 { e! `5 n, a* t8 b! ^ key(3)<=x3;* o. E* U8 C9 X( q' X- E- s
key(2)<=x2;
3 w( R( K g+ y9 R# [5 A key(1)<=x1;
) Y L7 a) T$ p" r key(0)<=x0;
# t/ J. W3 t$ j else
, h, R) G; G1 a! E* d p_20<='0';
/ I5 P. `" L+ P$ k end if;, e, y: b6 f' e5 T9 p$ P* V4 g& A
end if;
+ m* P$ j4 b, n( f+ b8 f elsif kok then
9 g* d M9 G; h) T+ _+ J z4 K0 l ks1<=true;
9 G3 i5 W/ p; ?" k end if;
1 p: ?7 h3 s y( X# T, l end if;1 m9 d6 w" i8 o$ V# ]8 l" ~ ]% j' B
end process ld_pls;
# u2 B$ A3 {& e: \, U$ H, {4 Hend K_S; |
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