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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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1 n) o0 E1 R! o% |1 v$ ELibrary ieee;
; p/ ~$ Y2 x7 Q8 v/ b- c; n* u* u! ZUse ieee.std_logic_1164.all;
" o4 x+ `, ?; I1 q7 l) D/ D: ^Use ieee.std_logic_unsigned.all;
; C6 C6 ]6 ?2 i' O' }! p
& w3 R% {, Y% {" D3 i) c' Y! k. i% hEntity Keyboard_scanning_2 is2 a/ o8 S( S. Y( T
Port(9 V9 _* ^6 }1 v
clk,c1,c2,p_21 : in std_logic;2 K- n8 c9 @; V+ \9 j O( U
kbi : in std_logic_vector(2 downto 0);
- s4 s. h* e: \ lt,p_20,p_6 : out std_logic;
7 }8 z7 P9 A- o$ G& ] kscano,key : out std_logic_vector(3 downto 0));* c$ s+ E2 [1 c8 h
end Keyboard_scanning_2;
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Architecture K_S of Keyboard_scanning_2 is) V* a! F: [- e, _4 `# n4 H
signal x0,x1,x2,x3,ena,l_p,d_b,count : std_logic;* i: u6 Z/ w5 L: m5 O$ \
signal D : std_logic_vector(1 downto 0);
; y; R. g! M6 [( rsignal ks1,kok : boolean;
" I; H# i" f# J5 s: J2 {2 l% SBegin
. f: q% \5 W. u1 }2 x" Flt<=c1 nor c2;
( J5 a7 I5 O( M: A
3 \7 q# P8 Z& L( d5 a3 a' z: Pfreqprocess(clk)
5 |+ z/ P0 [0 fvariable ff : std_logic_vector(16 downto 0);
9 P5 n" s- o, u$ G: q. n: F LBegin
3 V$ |, f; }, w3 e if (clk'event and clk='1') then
: ]# i' b/ P }6 } ff:=ff+1;" E& w; w5 e+ Z2 K% `
end if;
( N! T: a: v; X% d l_p<=ff(12); 6 M- h5 o2 x+ s
d_b<=ff(13);
1 E" n+ { l9 Z3 B3 r count<=ff(15); 5 i. q; [6 x2 H. l! E) K- M
end process freqp;8 s1 j( }- M' Q, I( e% I
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debrocess(d_b)6 e8 ]8 b; J, P# ~% x9 U
variable c : std_logic_vector(1 downto 0);
. `# ^4 _. ]+ VBegin
# y. _& W- _; T( j9 J' r if (d_b'event and d_b='1') then6 g6 E# l; p6 _1 [4 a8 @
if (kbi(2) or kbi(1)or kbi(0))='1' then
4 b/ k3 \. A3 F8 o& d if c="11" then
5 G7 \6 L5 _' c( p4 U: w ena<='1';
% q; F% e) E* j4 ~: N% W6 `$ f x2<=kbi(1);. l8 K3 @. O$ H. j
x3<=kbi(0);
6 i( f0 j3 U, z" K$ n7 \ kok<=false;
, K2 K" f. U- p3 _( ~& A, E else
) m5 n( ?+ O/ _0 Q# `6 M, ^ c:=c+1;
5 j# S' {$ T A, j3 M end if;
8 }( e9 h: `0 q& f! n2 }: T4 R elsif (kbi(2) or kbi(1)or kbi(0))='0' then
/ l" l+ n2 k" y4 y8 N ena<='0';
( C# [' S5 z& t- z+ h1 y) ~' M+ M' Q2 H kok<=true;
5 v: k2 s0 }, q5 k% L3 p c:="00";
/ U: u; Y4 ?$ k6 u5 Z end if;
" B1 E3 C( Y# M z end if;
. S* L# k. p/ M- C/ d xend process deb;
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! |) A8 K5 _4 O2 I* qcounter_scanrocess(count)
r% e4 L9 N9 `% D$ L/ i8 @Begin6 z( I, t/ I: v1 M1 L: F
if (count'event and count='1') then0 y' s' M3 [; K" \, r9 z( v
if ena='1' then
- b1 I% J( \) }, m0 J* j x1<=D(1);- k) o+ V& @$ I
x0<=D(0);
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if D="11" then
w" u$ S' L/ G: h' v8 B- l D<="00";
: n2 T% c2 @ q6 ^9 i0 R: z else 4 D5 ]3 S' e( Z/ c7 f8 g7 C
D<=D+1;
) }5 G$ M/ ^: l end if;
. o @" }" k6 q$ U$ y end if;
, U" O0 P5 {3 F0 a6 K+ Q8 G) f end if;2 X! H6 m1 x# [: A+ X
case D is
$ \- l; a5 [; }8 L# m/ C when "00"=>
+ {- X& e5 v' h+ S% ^0 s) g6 {9 Z ] kscano<="0001";
3 p8 [. [! R' _1 Y when "01"=>
0 Z. t/ Z$ e1 {9 \9 T2 F kscano<="0010";
# M7 C. k q( D: q when "10"=>- X7 j9 [$ N( H; _
kscano<="0100"; $ a. e, Q" U" O) K$ q0 e
when "11"=>
. S3 ?- @% [& U: d+ u kscano<="1000";
3 C8 J9 P: f! h when others=>null;; b- w+ K& N c
end case;
/ B# E. ~1 F3 p( J' F2 i7 Rend process counter_scan;9 n6 b: Z$ U0 M6 a+ N
& M. f$ ~# X9 Eld_plsrocess(l_p)
% h! z% L4 z( S, A8 N2 cBegin
& d( A1 W4 c& v X if (l_p'event and l_p='1') then* q3 F/ W6 U$ F' k- R1 u! q
if ena='1' then7 c/ j' W, N$ x2 [9 f8 S
if ks1 then
; L4 W3 ^) ~' L: X p_6<='1';& N+ s* H7 t( d' C4 t
p_20<='0';
2 H: r* X, U/ f# z& B. Q: f" l2 f ks1<=false;. ]6 z( a. L7 \2 j3 N- R A
elsif ks1=false then
" N8 D* d* ^" c$ S& T% p8 B p_6<='0';
7 x( _8 n0 i/ ^1 x if p_21='1' then
3 }" Q+ e% c9 y) {" R0 v |( ~ p_20<='1';: q' c/ o( P4 P$ _0 |6 Y/ ~1 q4 b# ~
key(3)<=x3;
" o# C; F: Q, S+ H* O a U key(2)<=x2;! k$ l& b t8 O5 y; s$ B
key(1)<=x1;
! |1 Z$ }1 j# { key(0)<=x0;
! b* o0 \: \7 g1 b) L. O else# B/ }, a7 ?6 Z5 @* c0 u
p_20<='0';& }: |' U& B. L6 [- v- ]+ X
end if;+ n' G1 ?+ F' j8 `1 c
end if;; V* q; p* m7 n8 [
elsif kok then$ ^* @' k( \ N- G/ r# D0 E
ks1<=true;
9 I+ z8 \0 [- m3 {& n! C* Q end if;8 \( T2 W1 v8 F& l. R
end if;
( v. U. ^' e, P2 i9 N6 wend process ld_pls;
$ ^" \/ i A8 y; cend K_S; |
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