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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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' D0 g8 P+ \2 ]6 z- o. PLibrary ieee;
. s) _4 _; h# H3 nUse ieee.std_logic_1164.all;
# [1 L& n8 E9 g2 F# N( U/ B" WUse ieee.std_logic_unsigned.all;# {3 w+ Q7 {) `& f
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Entity Keyboard_scanning_2 is
$ y, [' E7 U( u ~5 e! pPort(; B9 V; v1 c' r+ F
clk,c1,c2,p_21 : in std_logic;; b7 m/ E9 r& _! K1 _- y
kbi : in std_logic_vector(2 downto 0);
- F0 f1 E: d. o2 O" N+ j lt,p_20,p_6 : out std_logic;3 ] z z0 ~' u0 d# r
kscano,key : out std_logic_vector(3 downto 0));
2 Q+ h7 e1 J$ P5 f: r2 Gend Keyboard_scanning_2;
$ Z2 K; X5 x) C% C N4 G
0 n( a6 w. A0 r% k2 _0 N8 Q3 `Architecture K_S of Keyboard_scanning_2 is
a8 E) a- Y' b% z+ a2 qsignal x0,x1,x2,x3,ena,l_p,d_b,count : std_logic;$ I2 U* Y9 n4 ^
signal D : std_logic_vector(1 downto 0);
) y6 M, U' O. r4 isignal ks1,kok : boolean;
7 H& l5 x& A( i2 J* }4 y4 XBegin
( ^4 _! Y$ v- }) r% \0 x, f, o$ K9 {lt<=c1 nor c2;0 ?) M* \1 `- i+ a8 K# v1 B$ |
+ ]- n0 y* ?5 b: s& B4 d
freqprocess(clk)
5 l/ b& i0 l8 Z7 J- {* W* nvariable ff : std_logic_vector(16 downto 0); 5 E; t/ E0 l8 A; I( b& N3 d
Begin* c& [& j. ^ F( N+ U2 v
if (clk'event and clk='1') then
8 N7 `% c3 X$ k4 H0 N" o2 P' S ff:=ff+1;
) E( K$ `+ w1 |4 [/ G: q1 G4 S$ b end if;
1 D; s* _# P# \3 E l_p<=ff(12);
& H; x# v4 f# s/ B ]' r d_b<=ff(13);
5 l! j1 p M; o. ` count<=ff(15); 3 a+ r; l C& u) f$ _
end process freqp;0 i3 \/ l2 ]8 B" K& d: o
& ~, z" l. } p' N# U- N" Zdebrocess(d_b)
* [! ]# M6 N0 U* lvariable c : std_logic_vector(1 downto 0);- s- S1 j6 Q( i2 f; v
Begin
" y2 H5 }$ B! l7 X. m if (d_b'event and d_b='1') then! v. W+ q, A B* {2 U- }
if (kbi(2) or kbi(1)or kbi(0))='1' then) s1 e [8 ]( q
if c="11" then9 p$ @& k- E+ Q5 `! z# K A" I
ena<='1';: I5 l: X% R* h
x2<=kbi(1);
& L2 L& n, k$ `, M/ ~+ z/ k* c x3<=kbi(0);
' ?, L1 |' `8 P$ e kok<=false;
. |8 [4 | v' y: y5 s+ _! t3 Q7 l else
+ l6 j) H+ o' ]5 w. k- \ c:=c+1;
0 ~9 q& a, k8 v end if;
$ W7 p+ [$ A, O7 y. }; b elsif (kbi(2) or kbi(1)or kbi(0))='0' then$ f8 X, O% g2 H1 `( _+ P* j$ E
ena<='0';7 d5 q2 i+ O8 S% X1 E/ D& b2 @
kok<=true;+ i/ M5 z) H/ C1 q {3 H3 f8 W
c:="00";
% s0 E) G# L; Q) I& B/ Z end if;
8 G) l' }, e' o* S7 G: Z end if;3 W5 n* P5 G' i+ p7 p5 p
end process deb;; s6 i j6 \0 n2 l
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counter_scanrocess(count), {; c# a4 W: \, ?3 W7 [$ V
Begin
. x$ C5 X% r' m# C% v if (count'event and count='1') then
, T W( [' ?" U if ena='1' then
# E# M+ u: b9 ~/ M0 S. u x1<=D(1);) g0 ?- ] Q/ K; q Z% S+ K
x0<=D(0);( v+ ~: D" G9 O" g, h/ k2 D/ A4 L
else0 H F6 u1 L b1 U9 A( a, c
if D="11" then) z1 X/ U1 L% n: S3 b- Y
D<="00";
$ O, Q% {1 @2 N! K; O7 t! C else
: s! f H' R# J' R. Y& R/ I D<=D+1;
! |/ d" N }) U# f: l5 b9 }- S end if;! I* `) ~& f, P7 b2 H
end if;' }4 R/ O3 ]9 S8 F1 Q+ G! Z
end if;
+ x% k2 E/ `) R ~. s case D is4 y% j8 Y' l) C; b
when "00"=>
) A; U! w1 d2 A- D6 e& D. m kscano<="0001";
3 j7 H+ W$ F/ H5 C3 H! M when "01"=>- E: f4 I6 o# l3 [' H) U L
kscano<="0010";
7 N9 M4 E& ~) A when "10"=>5 m9 T6 {4 M" Y3 |9 @
kscano<="0100"; ; P9 `4 M: j9 J
when "11"=>4 W M+ W/ V x' |9 {; i5 J
kscano<="1000";1 s$ `: x$ v& l: S: O
when others=>null;. V7 d2 }" o& o
end case; " H) h. V% O2 g, z0 J
end process counter_scan;
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# s& E. F+ `0 D/ n- m8 Kld_plsrocess(l_p)! S' t- Y7 W# P1 ?
Begin
& `* u+ G. S( l8 j) Y if (l_p'event and l_p='1') then( v4 r/ |$ H8 X" D
if ena='1' then
0 G, y+ \" Y, _" @% j9 F if ks1 then s7 j `) {6 W) P9 ]# Y
p_6<='1';
9 u4 U2 a0 c6 q1 w p_20<='0';. G$ I( N9 g5 o+ [6 v. U) h+ p
ks1<=false;6 f4 E& i2 O! a) \* H( L0 ^
elsif ks1=false then5 K: m: o- M0 U3 d% p: n7 b/ i
p_6<='0'; ' s1 B) n! z; v$ u
if p_21='1' then
% s3 g, k0 r* v7 W p_20<='1';1 e v! ]' ]* Q
key(3)<=x3;
% G; J& d5 i2 B6 g key(2)<=x2;0 {( }9 s+ y: v5 K( p
key(1)<=x1;
: O7 l+ _2 |9 R2 |5 m key(0)<=x0;
6 n9 T& p' W: [6 T5 N else- r/ a9 ^3 v; u- L
p_20<='0';
. W) p2 \$ R7 e- q, | end if;
0 V5 Y9 P7 [0 y2 }, G: f6 y7 I( d/ _ end if;
8 X6 T% c/ [+ Q8 O2 y! O6 T/ ^+ U5 ? elsif kok then; ?- o/ U/ \! u8 [" r8 [. m; `
ks1<=true;
" i' A( h( u( M/ Z end if;- F- h/ C1 K* \, g) U- g
end if;
1 Y- P' j( w, Q; D* ~end process ld_pls;
( y& O& H) g- o( u$ W! i) O, X+ tend K_S; |
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