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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.% D3 }( O+ C& ] ~' q% T- q
/ y9 D3 {+ x; N* ZLibrary ieee;
) ~7 x7 J+ x! H6 q( Y( S! UUse ieee.std_logic_1164.all;
8 S# T4 v6 R+ I6 B* T! @8 }Use ieee.std_logic_unsigned.all;9 F2 L; l6 Q4 S+ q; H7 a
$ o& m3 w- @: H- ]( j
Entity Keyboard_scanning_2 is1 [* {/ U8 e2 D2 J6 o, ^6 R# D" z% A. [
Port(7 a S! k. Z, o6 R5 _; u+ s4 O' u* v
clk,c1,c2,p_21 : in std_logic;. `0 |- T! m* H# W I' N! D, Z0 r* a
kbi : in std_logic_vector(2 downto 0);
: w) Z! S; q! t' w, M# H lt,p_20,p_6 : out std_logic;
+ ~4 I [) c0 m q kscano,key : out std_logic_vector(3 downto 0));
% @8 B1 R( ~& \" L9 C& Cend Keyboard_scanning_2;
+ K8 s* k) C' z3 j. \9 X( G6 D, o7 ], r- k. h m3 l) o/ P+ e
Architecture K_S of Keyboard_scanning_2 is1 W* T0 j- ?* _9 N# D. K" c
signal x0,x1,x2,x3,ena,l_p,d_b,count : std_logic;/ a* s1 y5 W6 |
signal D : std_logic_vector(1 downto 0);
3 B; i' b9 ~% ]$ u: z! {) H' Rsignal ks1,kok : boolean;) a( L0 f9 _! B- {9 A& |& x8 k
Begin
; l0 y. D; N$ t, f3 V# flt<=c1 nor c2;1 U$ { _/ h# q
' g: k- q7 i3 b3 [
freqprocess(clk)
4 w, F' E# P/ l1 u1 rvariable ff : std_logic_vector(16 downto 0); 9 f8 ` K& u$ m
Begin
9 o- a# S! ?0 Z( W: G. Z4 @" y e3 e if (clk'event and clk='1') then1 b+ |+ G8 g/ o* L, Q
ff:=ff+1;
, `' P; r5 N' y1 s end if;! @( Q6 E! x& O
l_p<=ff(12); % V" c4 E8 U4 C. @. _* a
d_b<=ff(13); 8 h& p; D3 B& Y+ X, w8 O
count<=ff(15);
% `. x8 [8 M+ O9 Jend process freqp;
0 L" }8 b3 J6 ~9 Z7 p
' x& t; c, x, ]1 k+ kdebrocess(d_b)
( o8 q9 d- X/ bvariable c : std_logic_vector(1 downto 0);
9 x. f/ E. J; O' Z: i+ Z( Y. pBegin3 S, U3 U0 ~: r" b1 Q% b
if (d_b'event and d_b='1') then& D( @- J- W! S) M$ r V2 T
if (kbi(2) or kbi(1)or kbi(0))='1' then4 ^$ |5 p5 G, ^/ C( I2 P
if c="11" then3 d. _; U/ e* \7 ]/ B& p- w2 _
ena<='1';4 F# Q& ]- ?' E5 s, F
x2<=kbi(1);
- J1 K/ ~7 h& f4 f6 V: v x3<=kbi(0);+ J: z$ L) l+ R' f! z) ~/ ~
kok<=false;
" ` `& |7 s: q else 0 U' @" @8 H* m0 u4 S
c:=c+1;: D0 Y; n V: M/ T; S3 ?
end if;* a3 b6 J: }7 X* i
elsif (kbi(2) or kbi(1)or kbi(0))='0' then
/ B6 O3 g3 ?# f& Q8 l6 N ena<='0';
" d1 |; Y' c, D kok<=true;
8 O) l3 I; B+ J* C# r c:="00";
" s6 ^' r2 f3 `1 m* o" D end if;
$ M4 z+ a6 ~6 L& V$ y5 |8 f/ r ^( d$ F end if;
2 t R& @5 T7 ? [# a' n# }4 vend process deb;2 H1 V4 v+ m; \: n$ A) i4 a; \# d, i
/ f5 d4 R0 ]0 K! o
counter_scanrocess(count)- d( ~" v3 c6 B3 _- v
Begin
8 {8 w0 L5 u2 k1 j6 u if (count'event and count='1') then; Y. i# o1 G: P7 p
if ena='1' then
$ K4 q) N. \/ i2 G x1<=D(1);4 R! ~0 c! K7 a9 N
x0<=D(0);
$ c) U, Y% f4 s- Z+ d8 r else9 I0 y& `: ~& O$ R) j* _
if D="11" then$ z3 j' b7 S; T: ?
D<="00";4 _" y/ p8 [) n! V! ~" E; e6 U) F
else : B! B# g: Y1 C; M
D<=D+1;1 X% A* U# N5 L
end if;, A+ [7 Z1 F9 z7 {3 q% ~9 [
end if;
0 ^. w% K4 f) K) S- z3 [1 W( K end if;
3 p5 f2 i9 u0 r& J. v case D is
: r7 Z2 w. R9 G% y7 B when "00"=>) ]% R; j2 w% \# a
kscano<="0001";
: K3 C1 y- R7 [% o( @8 u- F! l4 d! V when "01"=>
. _1 ]0 e/ `' f! [5 I kscano<="0010";
. V, S6 [6 [: ]& h4 Q& Y( | when "10"=>: P- u. }: k& C" c5 \7 c
kscano<="0100"; $ x3 ?. e2 u" `) F' N# Y
when "11"=>
! c( }2 j) X) F, m w, ~% W" x kscano<="1000";% L% x+ P. i' O& p/ A7 k3 U8 o
when others=>null;
$ ~+ k0 m! R3 n. { end case; ! C! k! Z3 a" Q# K7 |
end process counter_scan;* [: y1 D4 L; J* @
9 Z0 j6 F0 h! T3 y3 S s( Yld_plsrocess(l_p)- {& J; Z+ Y% v8 b& [; P
Begin1 _$ k6 k9 n! F+ Y" O6 J- N R
if (l_p'event and l_p='1') then# h; c( k2 n" p3 x
if ena='1' then
" e- l. s6 g/ e$ S7 P+ G if ks1 then' T7 ]9 ^ T- J3 ~+ K3 F& |7 e! q
p_6<='1';
6 r2 }- E4 j: g0 k! M# f; J- h m8 Z p_20<='0';
: K) i$ A/ n2 }- d/ j ks1<=false;
$ R C8 F/ e3 V elsif ks1=false then) H. Z( X6 z. e! V
p_6<='0';
/ b d1 v6 v* T7 `# k if p_21='1' then+ O3 L& m1 d2 l, t' {' o
p_20<='1';
6 k1 f" A* n @3 B7 i key(3)<=x3;. a8 h4 y, w, y% |. m8 F m: c' t
key(2)<=x2;
+ u) W! k1 ^# W! Z C" r key(1)<=x1;% d W5 G5 H6 v6 W- w! o& X
key(0)<=x0;
2 B+ c3 a( w) ]0 V; y else
/ o* y& N. j: {/ x% }$ t p_20<='0';1 |; ?. M; q4 m9 l# h3 }9 [6 O
end if;
* C L1 g" h+ c" A0 t% J end if;
& K* t+ w& T5 U( M2 _ elsif kok then
& s* U; L& v3 g; q; J: z. h ks1<=true; # J" n D+ i8 M; O3 P, g
end if;
3 B0 q. J7 @+ E/ D3 E# r; s3 N end if;7 f# W& L' z- T, t" a% [- ^
end process ld_pls;
5 _( X0 H1 L8 ]# C0 V2 V7 m I" rend K_S; |
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