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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.* V! j1 d; L; F' N
. T- \ P! i3 `* ZLibrary ieee;! ~: ~* E9 X9 V) @& X k h
Use ieee.std_logic_1164.all;
* J# u, s' c% ~. t5 EUse ieee.std_logic_unsigned.all;7 I* u+ S% Z1 }3 e2 U/ ^2 [: t
' L9 x! g8 Z4 J6 h9 q! ]5 m
Entity Keyboard_scanning_2 is8 V. O% U. \3 f3 W. V
Port(
: D1 z4 }/ [- b$ C/ D; t clk,c1,c2,p_21 : in std_logic; G2 M0 p- D) x/ f- ^7 x- _4 i
kbi : in std_logic_vector(2 downto 0);% O) z4 s. o4 A9 d
lt,p_20,p_6 : out std_logic;) K- h/ Q- Y; h0 E
kscano,key : out std_logic_vector(3 downto 0));
$ H$ D3 x' W( A: C, ?$ Tend Keyboard_scanning_2;
* p8 a( G0 M/ T) t' e5 N
. p) p! K' O6 t/ ~8 |" P6 xArchitecture K_S of Keyboard_scanning_2 is- g2 K# d7 W/ B+ d: L
signal x0,x1,x2,x3,ena,l_p,d_b,count : std_logic;6 o2 }: E+ z4 @
signal D : std_logic_vector(1 downto 0);
$ B6 F5 C/ N6 H- csignal ks1,kok : boolean;% S0 J' ]. a! h. N$ P( m- u/ e
Begin
/ b+ c r$ A/ A- S5 p9 ?( Elt<=c1 nor c2;
+ t- v4 G' C! S9 o5 h5 D! D. q: u" b; J/ {) R& d
freqprocess(clk) / \; f O; z5 m
variable ff : std_logic_vector(16 downto 0); 4 F& S3 ?/ y8 e) w/ u8 P7 B$ l
Begin
% y- f" C, r. Q/ P if (clk'event and clk='1') then' e; m, U" z5 |
ff:=ff+1;
) Q( l* m5 |4 O6 w2 t end if;9 w3 P; i# y f
l_p<=ff(12); b# t5 a7 v5 _: U5 Z
d_b<=ff(13); 8 n- ^, W6 s5 I! u
count<=ff(15);
1 |4 s' J/ h' m+ R8 s. ` d: K/ Lend process freqp;
7 c- L+ A# }" Z$ u' ~5 r3 c3 Z
. I, E" t' a* z6 kdebrocess(d_b)
O$ f& q. q" n; Z( \variable c : std_logic_vector(1 downto 0);
8 u' {2 g Z( \2 {. oBegin) D( x! k1 k/ _( Y& _1 J
if (d_b'event and d_b='1') then) a3 P0 Z1 |: S; e% M; j
if (kbi(2) or kbi(1)or kbi(0))='1' then
6 O- j/ S5 f2 b e8 J if c="11" then
1 q0 D) S$ F) s0 i! U9 R: [ ena<='1';) B+ S2 j% q& b
x2<=kbi(1);
1 w( Z1 L$ S) X4 O x3<=kbi(0);% v; I7 I0 T& h3 [. T8 \/ k, i
kok<=false;" w/ ^( F3 Y. A- ^
else
: w8 D8 m* C, t" w& V4 R c:=c+1;
& Z& a; ~0 S$ ^5 k K end if;/ B: u2 V |) u# ^ d
elsif (kbi(2) or kbi(1)or kbi(0))='0' then1 w; C2 r' a4 ` z% a8 e* y5 A5 X
ena<='0';
$ i2 T# u h( t% G% M kok<=true;
) z% V( |! h) T+ ], c+ X c:="00";
4 b$ _) a1 {) H* g3 M) k% y end if;
0 }! _0 P8 e/ m end if;" n, q ~- B, W* j4 x) j
end process deb;% q. ]1 V& h$ d. h b2 h% S
5 B, H6 ~8 R# k1 d, dcounter_scanrocess(count)5 Q7 i# H4 _2 j) I# Z* t; c
Begin
% p8 y5 F. c/ I2 O7 f# Z if (count'event and count='1') then; e! a0 e+ |. h1 T% L' Q; o
if ena='1' then% Z m0 [$ P7 t$ M8 C
x1<=D(1);4 L: O/ j. {# `1 P8 x. S
x0<=D(0);
, x- }; c1 ^6 R1 J else8 Y' h+ \/ c) J# a6 E. s
if D="11" then
1 m* p, C( [% i# l8 C- Z4 ] D<="00";
! P8 x3 @* p7 z5 K p else 0 C' T/ ^8 T9 p5 w# N+ a }
D<=D+1;, h5 w3 L. R# k+ I, z
end if;
) m. D6 D- E( F- P end if;
: d6 U* E* r' @. S+ k end if;9 T" Y$ b# F/ ^" v- G& t8 p# Z
case D is
$ d$ E( c/ B3 p+ x( }5 u" X when "00"=>
8 Q) M2 a7 h$ C# y# ^" |5 g9 z kscano<="0001";4 u# t0 u/ l4 U+ A5 v9 F) t, f
when "01"=>9 n9 s0 B+ H( r1 U% a
kscano<="0010";
+ a0 M' C( p3 S8 G5 C when "10"=>
/ a* {6 E2 x, ?6 J" c, `$ ]3 v1 u; s kscano<="0100";
" G6 t2 y" p' W5 }: I. K% l when "11"=>
% S% T9 ?! x4 A" e kscano<="1000";) o; l6 E/ D+ ^
when others=>null;
" J& G. ]& z3 R' p9 f( T9 H end case;
" d( r; i& |! I( D9 W# _; Gend process counter_scan;. H7 f( S& Q- p: J& Q! v
& Y4 ~6 c/ _) ]- n p5 @ld_plsrocess(l_p)( F+ ]* J2 R9 k9 D
Begin$ a2 r3 |' I# O2 S
if (l_p'event and l_p='1') then U. T! n- b' i6 o
if ena='1' then! Y' R& r" {+ U* k$ q/ Y' G
if ks1 then. \ x0 x3 ?% A) H/ T# I
p_6<='1';- C1 L! f4 j$ E. w8 G( V7 G
p_20<='0';! K2 T5 c/ c! a7 t# O
ks1<=false;
% |& v, v# ^" z; } elsif ks1=false then& c& C& D" T: L/ \7 U3 D4 H( K
p_6<='0';
% q' l* ^- D, _0 H1 o if p_21='1' then4 w( J! t4 N; W) k ^% L
p_20<='1';
. I4 s: Z$ r- t, h+ p key(3)<=x3;
3 C) @1 d/ [8 k2 e4 u( _9 n key(2)<=x2;
( l! S0 j% }; M2 `* } key(1)<=x1;
5 E% T% R O* [: C/ G key(0)<=x0;8 B! T ]1 n. L) O. _1 ?
else
0 g4 F: N) Z* n. u' D& L/ [& d# O. R p_20<='0';
A# `2 ]6 Z& y5 p& e6 J! R5 L end if;$ G" L/ q: ]1 L2 p; {
end if;
1 f/ t1 f. y1 M# Z& \. Z elsif kok then
- P- G4 u' b. A7 B8 S ks1<=true; + ?+ P) a, Y# w; |
end if;
) Q1 `- M u, p' P1 A end if;
$ s( o4 g* Z0 J' wend process ld_pls;. R& N- h4 q+ t+ _9 e4 a/ h8 \
end K_S; |
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