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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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Library ieee;
+ \" Q' o! f4 N( k& D" h/ hUse ieee.std_logic_1164.all;
$ D! i& r5 D$ }! {3 j7 n5 tUse ieee.std_logic_unsigned.all;
6 G( a; D2 |& Q2 b9 v
6 {5 g3 X0 L3 h6 D( `: _, D [Entity Keyboard_scanning_2 is
7 H& W$ Y$ S% p" D+ L; BPort(( L/ l1 }9 f' f+ x l
clk,c1,c2,p_21 : in std_logic;
$ u! M* Y( d9 s5 M: n% m kbi : in std_logic_vector(2 downto 0);
1 U& n2 G3 A; `( q0 Y& d4 u/ D( V lt,p_20,p_6 : out std_logic;! y* T. g+ i3 I x$ `" H
kscano,key : out std_logic_vector(3 downto 0));% g( ]/ Z7 @' W3 F/ Y$ K
end Keyboard_scanning_2;7 ?8 c% K& _' `; J: @" Y( Y2 l# K
7 @$ T! W, S7 I
Architecture K_S of Keyboard_scanning_2 is
+ i' A& L+ U3 [& ?& \" Xsignal x0,x1,x2,x3,ena,l_p,d_b,count : std_logic;
B- H1 s; F0 Usignal D : std_logic_vector(1 downto 0);
/ Q7 J' Z. N w0 ~$ @signal ks1,kok : boolean;
2 T2 X5 X2 b# G2 j* z7 f: SBegin
) `, Y) ]) H8 d @$ u" @ t5 wlt<=c1 nor c2;; @1 e" Z) N2 d$ Z9 V+ f
! E$ k. C3 @5 j9 B; g& s0 I
freqprocess(clk) 6 h: N& G: K2 o7 {! G
variable ff : std_logic_vector(16 downto 0);
: e9 T% h9 y# gBegin
6 \5 F8 x9 [/ y' s* Z6 ? if (clk'event and clk='1') then3 i3 I% Z+ T$ `3 v6 z; n
ff:=ff+1;- q& B- s9 s/ d$ t6 M3 t: z
end if;
- ?5 `6 g, L7 ]: ~ k l_p<=ff(12); 1 p+ ?4 o$ U8 k7 b1 G3 k
d_b<=ff(13); 3 N' c! j s/ G) x& s& D
count<=ff(15); ! m1 M c! F' t" R7 r
end process freqp;6 _& t6 N8 u- b1 i/ ^
! g0 G% }+ r8 D4 odebrocess(d_b)
% @7 X4 C. j, q! F- }7 A. Tvariable c : std_logic_vector(1 downto 0);
' d* S l( K4 j. Z0 PBegin
: M; A; a5 _. K) b- c if (d_b'event and d_b='1') then0 y; t/ A& U( z0 H
if (kbi(2) or kbi(1)or kbi(0))='1' then( [1 @' Y- f& S
if c="11" then$ X. f5 S, j( O
ena<='1';
3 w! t7 p2 U6 f1 e x2<=kbi(1);) ~/ T; O* |' {& d
x3<=kbi(0);8 S6 F3 e; h3 Z; k+ g0 n/ Q: p
kok<=false;
# S+ f# F4 Z4 ]5 b+ v$ w' \ else
$ |& q1 ~; ^ G* H7 X c:=c+1;
( G' N" I% T) a, K+ u end if;
& I0 P5 x7 b$ r4 I elsif (kbi(2) or kbi(1)or kbi(0))='0' then. f& H! V4 W( h# H+ Y" K" E
ena<='0';
/ C$ t$ {' a% ^9 ? e4 w kok<=true;2 Q. U, y+ k/ r+ h3 K
c:="00";
( Q; R9 X, ~; W end if;
" R0 P. g9 A4 p end if;9 ^3 o$ Z9 B+ C
end process deb;
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counter_scanrocess(count)
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if (count'event and count='1') then7 K" u% n6 A- q8 S* T9 R+ x
if ena='1' then
& n5 O3 [$ E% `. U; L# F& ? x1<=D(1);* S5 g( u, \7 g2 ~$ j# T
x0<=D(0);
* [' `, r+ l- g d; s; S c" H else
7 ?) q) P- C% Z- v7 _ if D="11" then
7 q+ M4 j; {# {0 f3 R8 `0 O D<="00";
6 ^" ?' P$ s; h# P( O0 n else % i! y/ |4 Z1 S* u9 {' r/ O9 r
D<=D+1;
! k+ F# x; j# ^ end if;4 R) c9 q3 `2 K
end if;
! ^0 s8 ?, R D9 C end if;1 \* d+ z6 l$ K* ~( H# G
case D is3 ^" x* d" ^( w4 \
when "00"=>
! a0 D$ @( P' s- V kscano<="0001";
, b$ y1 A/ Y1 ~" l% R, a) M7 t8 N when "01"=>2 L2 ^( n' ~# c* S, D
kscano<="0010";
# W; s: f, ^4 z# w2 i; t when "10"=>
. U! R& \# l7 d8 o" t8 X kscano<="0100";
+ H" U9 @, n+ Y6 W, ]/ r when "11"=>
; F b4 p* C" d6 t kscano<="1000";, h V. n* K3 j: g1 c/ R: a
when others=>null;
# s- O. d: [8 I end case;
) q0 }2 }% @- R t$ t8 s A* Wend process counter_scan;' c' o( s% R7 F; T
7 U% K$ L; w: g+ @
ld_plsrocess(l_p)- W3 [5 g& L5 k% M% t- y9 K: N1 y
Begin
: w' e c) D- D6 p: |( p6 T( x- x$ a if (l_p'event and l_p='1') then
, B3 ^2 t' E9 ?3 H if ena='1' then
7 d- w& X1 n0 z; T! b1 [2 b. X% u, W if ks1 then
- |# L) h, H5 ]: ?% E+ Q p_6<='1';! f, A+ u5 @* g9 G% S/ R1 F
p_20<='0';7 D/ M/ ?+ `& w6 {
ks1<=false;1 p8 J0 U0 K6 @' z4 c& |
elsif ks1=false then w, G0 \$ l$ A, U
p_6<='0';
& C, w; v. {% d& c if p_21='1' then; a' A3 T0 t( R" P1 h# O0 B( |
p_20<='1';* n4 l1 O* P# }0 N9 F- `" U
key(3)<=x3;
1 L1 @9 k, l- `# n( X! k" A key(2)<=x2;% t* |5 W" w7 f
key(1)<=x1;3 C- @! q1 V& V. v% s! q/ x
key(0)<=x0; j1 p9 h+ e- b" c2 |
else
. Y" V s/ \, k; M8 G: L& y p_20<='0';
9 l/ ^) K7 M C1 b3 ^/ ?. k/ q end if;4 Z1 @2 X& t6 H: H3 b" }& F
end if; V& ?) A8 L, M' `/ Z: N; T
elsif kok then+ N4 s5 C. x3 w j7 D1 o0 O: x
ks1<=true;
& [% ~: q" {7 `! g end if;
; i4 e: _# P. H' G2 E1 m end if;
1 g" c; m& @8 _) J# Z6 wend process ld_pls;4 t6 S( {4 e. C! |
end K_S; |
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