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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.( p( g. {* E& G# N
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Library ieee;. E* H6 l: f) K3 ^9 r1 d, X
Use ieee.std_logic_1164.all;
" C2 C4 S, w3 @% o1 `2 Z. S8 mUse ieee.std_logic_unsigned.all;* c& q2 W% S" Y
) b c4 G& P! v! \, D6 J1 |Entity Keyboard_scanning_2 is
2 H6 `8 x# U! m- K. ~1 x$ V2 a3 \Port(, n7 Y8 @, h+ t9 t) k
clk,c1,c2,p_21 : in std_logic;
( p6 }6 K6 q% Q. c4 r kbi : in std_logic_vector(2 downto 0);9 n4 D6 Q& u7 g* E! K
lt,p_20,p_6 : out std_logic;4 p" T1 s9 j# o. j+ b
kscano,key : out std_logic_vector(3 downto 0));
4 D+ {0 L& U- n$ [end Keyboard_scanning_2;$ \4 X" i3 t1 Y* ]1 V2 W
9 {, T# P* z8 ~2 s& G8 V% GArchitecture K_S of Keyboard_scanning_2 is
1 o, I* A5 B9 W. U) ^! c3 Wsignal x0,x1,x2,x3,ena,l_p,d_b,count : std_logic;5 D8 o& ^* F9 @
signal D : std_logic_vector(1 downto 0);
/ I2 o4 n D) V4 r. R! L) csignal ks1,kok : boolean;
6 A4 O o3 y: w9 L4 q, m4 y3 NBegin. X x) g; Z8 U3 r5 @
lt<=c1 nor c2;
& G2 I3 ~) y$ X1 I0 |& T
4 J+ i/ ^8 v* h+ O( o0 `freqprocess(clk) : k5 {2 Q$ ^$ d" y. W( m7 f, e$ ^* T
variable ff : std_logic_vector(16 downto 0); , f E. E1 ]9 M: R! P
Begin
9 a1 g+ }3 L9 m# @4 ` if (clk'event and clk='1') then0 C# C% K4 z8 u
ff:=ff+1;
/ s' K3 z7 _3 ^, j end if;0 Y4 j/ W3 T, t
l_p<=ff(12); 9 Y. L s! z) ?* A+ L. s
d_b<=ff(13); 5 `! D) w$ Y, {2 Y4 \
count<=ff(15); " e8 B4 ?6 B1 {0 s7 [
end process freqp;
$ s. [1 x4 A5 c8 J
9 b9 R% d7 F1 m& t% \" V0 I9 Wdebrocess(d_b)
* s- O9 `8 p1 ^variable c : std_logic_vector(1 downto 0);; x+ _( l" ]5 \1 @ F
Begin
- i; v# i# d3 J4 |+ C if (d_b'event and d_b='1') then- ~/ {; ]) Z x; h# O+ W
if (kbi(2) or kbi(1)or kbi(0))='1' then' B# @7 ~* o4 g: C5 [/ }" j3 @
if c="11" then
9 ~9 B5 k6 E$ U ena<='1';8 w7 e/ ~8 P$ p& e
x2<=kbi(1);" Q$ ]6 x( F- u
x3<=kbi(0);
3 d! i' r- \2 N) b+ ^ kok<=false;
]- D! V3 ]$ Q7 V; @4 w, |3 @4 {% T1 } else
7 B1 E- @* Q! ^ F' g* c4 A c:=c+1;$ V( ?2 M& y5 p8 |3 j% Y2 U1 H
end if;
# O$ G3 H: |( Q/ p elsif (kbi(2) or kbi(1)or kbi(0))='0' then
0 t/ A6 P& ^# @$ p R/ R J ena<='0';8 R: ?; s. j o! {! g' g+ C
kok<=true;
3 }2 V' F1 R+ e c:="00"; ) q/ l1 h+ q" r; ?. L8 a
end if; ' V. k8 `& Y. i5 V- Q- E" R
end if;
) J! O3 D% E; |5 K6 `end process deb;0 M1 F3 Z# a/ }5 @* R$ \
; R- [ K6 D/ X0 }( m* f, a e3 Rcounter_scanrocess(count)) I# e* ? D, V+ _
Begin
7 g: O2 O9 m) g; ~+ w; E! v if (count'event and count='1') then
! c' k8 Y& M4 H# X% Q4 a+ T) n if ena='1' then
, D# s; T7 ?: j% l; v7 T x1<=D(1);
$ j# K1 [7 F: P4 _4 h7 a# g0 K5 `. o x0<=D(0);, E. R) @0 F9 x
else
( o: v5 P) n. d4 w& e: m8 p6 @ if D="11" then' I: Z/ i4 Z3 ?) |1 f/ {
D<="00";9 Z6 U6 H2 ~7 R& @
else
( {* H, \8 L2 r5 C9 d+ C, i D<=D+1;
+ m) z ]( ~5 q' x7 `1 k; {* ?5 n end if;
; f- E& P1 v+ R+ H; l end if;
( c4 T5 z4 }7 l" Z8 ^8 m7 u3 S end if;5 i* Z6 X3 g+ S& v. z3 a. A, M7 j
case D is" f0 m6 W+ I+ @: i8 C5 Q, N
when "00"=>
$ S+ g" y1 e* ?& ?& c! C- r kscano<="0001";
) f! |! {2 i) K* J1 G5 T6 l- C, `! y6 i when "01"=>
- W) O" I" J4 B kscano<="0010";
* j0 t- \' b& z+ Q6 [4 h when "10"=>2 C) G }/ X- P
kscano<="0100";
' G" h0 o* y6 I4 @: j' i3 t$ k2 _ when "11"=>
, X- S a/ h* x6 N kscano<="1000";, k, Q0 Y b$ X5 x& n& w9 ?: {
when others=>null;
1 q2 e9 ^6 }+ J5 g end case; % }( K0 F: x+ Q: \! ]8 _* P
end process counter_scan;
& v; H( o' n; {. I; f0 E/ w& X( ]# y! K, v% \- c5 Z Y5 T
ld_plsrocess(l_p)- g! L$ m# v6 f( x
Begin
: f0 _: r9 P6 p; G ? if (l_p'event and l_p='1') then
# L1 L3 K$ G! F- D3 C0 @0 N) \4 x- v if ena='1' then- z: \# g3 n8 H
if ks1 then
) M: g/ l c( D$ ~9 u p_6<='1';
. k) q; }$ q2 p* a5 c* V: U p_20<='0';+ C" l" M! }; U) p" c: G$ h
ks1<=false;+ h' ^" k$ B% e' b. I T( z
elsif ks1=false then
+ l" n3 X S. u9 ~ p_6<='0';
/ `- \% F# w8 W d* N% } if p_21='1' then
5 i2 ]# Q) W) x p_20<='1';
& O6 p/ @) F; z1 M/ D. D key(3)<=x3;
7 ~( q+ i! C- B2 @- W7 I( t key(2)<=x2;( h: @# K# b# Y9 p. z9 i
key(1)<=x1;# f/ d% n. D. C8 Q4 S$ z
key(0)<=x0;. k$ D$ t3 h( @6 f
else
; u9 ]9 G4 C& `8 \* A p_20<='0';
1 d0 j b+ t( X O3 |0 |( D$ M end if;
" S ?% E) E0 Z* k4 e* j7 D end if;1 H# U% d# U7 w: D
elsif kok then
0 ]3 x" D: ]+ c6 B( Z! K T1 ? ks1<=true;
/ T h- {/ s7 H' i end if;! e/ E* Z, _$ X6 ?4 _
end if;5 r1 D1 s& H! g6 F
end process ld_pls;9 b+ o6 l: r( |& y5 _
end K_S; |
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