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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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5 x1 B, T4 _! s% V8 G5 g' l* G PLibrary ieee;; W$ F2 }$ W* k7 t: x2 _
Use ieee.std_logic_1164.all;
% s6 z; b) }& v: b& B. xUse ieee.std_logic_unsigned.all;; a" A& u7 R& o! m r
3 |# Y6 D7 b0 D s D
Entity Keyboard_scanning_2 is% l& P9 {( `! W
Port(
3 J9 J6 Q# K6 v% l" b) w clk,c1,c2,p_21 : in std_logic;
; x$ Z2 G' a+ \" q; ^ kbi : in std_logic_vector(2 downto 0);* O- x8 B1 l. [- ~& A
lt,p_20,p_6 : out std_logic;0 ?- V5 D0 F0 F8 |
kscano,key : out std_logic_vector(3 downto 0));* f- B B& L" Q( m" `
end Keyboard_scanning_2;
# o; F. x& U& ?
% d9 S, w9 u, Q# r" }Architecture K_S of Keyboard_scanning_2 is1 F. i3 a2 B! |. P% D% `$ O
signal x0,x1,x2,x3,ena,l_p,d_b,count : std_logic;
) ?& U5 m+ a" K j$ `4 }9 O6 j4 Xsignal D : std_logic_vector(1 downto 0);, B% Y! V& Z6 N3 E" [1 N0 G: A- I) x
signal ks1,kok : boolean;
' L( U ?1 l. e4 p" [' jBegin
' S: i+ W) l" l, q, v) r+ Jlt<=c1 nor c2;5 L2 R2 G1 e: T& M
' N7 F: ~6 v/ F% U" \ D; d5 O
freqprocess(clk)
8 h% [) r, q" \9 Xvariable ff : std_logic_vector(16 downto 0); ! t) X* j2 J: D1 ^0 l1 u
Begin. X; j; |$ N" E# e5 R9 F
if (clk'event and clk='1') then2 g8 t) }% k! F
ff:=ff+1;
# U; ^. M5 Z! y9 C2 j end if;
0 M: h. |9 }+ u& w$ S l_p<=ff(12);
3 {4 n! X" }! b* j d_b<=ff(13);
0 ]2 _" R3 ~# v: L count<=ff(15);
% x3 N1 W, c: J1 y v* _& v/ Gend process freqp;& y$ K: \1 Y7 M' y2 G& v
% k4 R; p; {/ S% Ddebrocess(d_b)/ j5 g3 @( c$ p& V
variable c : std_logic_vector(1 downto 0);
# X( [6 X7 P% FBegin
, V" c1 O+ C! s, A+ t/ S4 S! K if (d_b'event and d_b='1') then
3 G7 n5 V' Z7 i5 S2 L! e) o if (kbi(2) or kbi(1)or kbi(0))='1' then
. p( c c5 P8 F) m, F2 t0 f. \ if c="11" then
2 E t7 A) c! h' n ena<='1';. g) ^# {) b( O+ @. F, b. O
x2<=kbi(1);
6 q) i# v/ F6 Q; w2 B B3 | x3<=kbi(0);2 `) w+ Y1 p* X2 j: D3 U# i1 n
kok<=false;
3 T# v' |9 q1 C% Q/ r else
p% w4 Q' l3 z. j. p c:=c+1;
) n9 A9 z5 y! | end if;) }5 P3 S& R6 X
elsif (kbi(2) or kbi(1)or kbi(0))='0' then
! L% X( d7 R/ ^* C4 \3 d ena<='0';& Q X5 f4 e; U/ ~; c6 I3 r
kok<=true;
) H% C) m* L! c0 k6 @( c. Q c:="00"; ' y. M. p8 i5 q2 ^
end if;
$ l1 M- s' m, h; o G end if;
( s% u6 P+ Z# C2 Cend process deb;
: A5 J7 K* o9 ~$ L' ]# |3 l
& F8 O& L; e- R T1 D% Acounter_scanrocess(count)" | P; u) x/ @; E1 N
Begin4 _1 Z# }0 a! d$ [$ c2 c# i3 U* ]. Z
if (count'event and count='1') then
% b0 }/ m c( p O if ena='1' then
|9 l) ~/ w' P/ h, I) @5 d+ j: D x1<=D(1);8 N& J6 G# ?, O5 z, @3 {/ T0 A
x0<=D(0);
2 k+ U2 x5 A( D6 p else
e4 F( o6 [, [5 w! C6 F, U if D="11" then
$ l# Y1 |2 `' v8 V' m4 F L$ A# e D<="00";; N5 F6 k- @0 z* G) q8 B
else
7 ]% J1 I0 T5 Y- s D<=D+1;2 E/ J- D/ [" A. {0 m
end if;. L$ R, x1 r# R% S; i' T3 J4 ?+ T
end if;2 k }0 a# ?* F5 d- l4 ~4 x
end if;
+ B" C W: @0 Q. q5 w case D is
# _& ?& R7 Q$ N when "00"=># e" |. i* a- a% D& G& A2 t: J# l
kscano<="0001";
6 n+ F5 k3 E8 D" [, E4 Z when "01"=>7 t+ t: |& g$ P$ h, ~% X9 r
kscano<="0010"; ]3 _; e' T( z* H3 c# Q0 u4 R( ^
when "10"=>+ q6 N8 T' y; F1 _
kscano<="0100"; 9 M6 d3 a! D# Y0 n0 u3 k% K
when "11"=>: V% U/ n4 u r; v
kscano<="1000";
& i& U6 y$ E) j$ G when others=>null;
$ |( C1 S/ I" |0 A( K end case; 4 v: c9 N; [ O, K% W9 t: {
end process counter_scan;
' N- y t2 V# t5 c, b: q, p& B) O# D+ I1 K5 L; |: c/ {
ld_plsrocess(l_p)$ ^1 E8 x0 e; s; I
Begin9 B" u/ P( N! ^2 ~6 S$ y
if (l_p'event and l_p='1') then6 M+ A. R. [4 n* f- T/ }; s
if ena='1' then. \: z7 U( z# |+ X8 K) O/ P! B
if ks1 then+ ~ H* Q- g' G6 p, G
p_6<='1';
$ j d0 l0 }9 h' K/ g; O p_20<='0';$ e3 F' C; {: \$ J" e+ l
ks1<=false;! ^% b+ ^& h: ^/ r
elsif ks1=false then2 Y4 i) G2 g; Q+ ]3 T1 n) v1 A4 V
p_6<='0';
; w& b' s0 `* ]9 Q7 x- ?$ l if p_21='1' then1 ?8 b g! Y0 j; ^
p_20<='1'; @) ]# d) j' c# V2 C9 Z7 T
key(3)<=x3;- l9 d1 o* L# ~. u
key(2)<=x2;
9 F& w7 h2 r3 [) K) L# Q0 i key(1)<=x1;
" m/ w7 q- I w8 a# V key(0)<=x0;( }) Q+ P5 r* D
else; i, ^* f/ H) j) U4 [
p_20<='0';6 H5 z' e# u! l9 c+ Q9 `& g" f
end if;
# K& l5 _. ~4 k& v+ m end if;
8 k6 z3 n( D7 J, p. ]$ u elsif kok then
. G" I7 |& ^) P ks1<=true;
$ p- ?) |5 e U end if;
# ?4 j, Q: _% o0 E1 }% q) X$ I end if;
2 Z5 i% W: Y, U# [) D/ g% kend process ld_pls;5 X! [" ]; ?* x- W$ M! W
end K_S; |
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