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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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Library ieee;
$ a1 j7 k" b. Z- \/ yUse ieee.std_logic_1164.all;* l% W% Z1 r, Y3 F! S! z
Use ieee.std_logic_unsigned.all;
8 G: x7 o( N8 c) O9 A- V' W V* U+ Z) N* J! u e: [3 U& w
Entity Keyboard_scanning_2 is
' b# |' A0 @1 X! p; GPort(0 R8 b6 p9 s7 D/ j, _: i
clk,c1,c2,p_21 : in std_logic;
?% [0 k; A2 h$ ~4 g: Z B+ G% @' H kbi : in std_logic_vector(2 downto 0);* M: {: t+ k9 {. H. E. `. i
lt,p_20,p_6 : out std_logic;
0 V" [8 F7 t2 _% ?' l kscano,key : out std_logic_vector(3 downto 0));
a/ m- I6 l& y) M8 ^end Keyboard_scanning_2; k5 h; _+ l( A4 I
0 b* j2 @! O# L7 H. uArchitecture K_S of Keyboard_scanning_2 is- t( G' o# I! Y' \" W7 h
signal x0,x1,x2,x3,ena,l_p,d_b,count : std_logic;
) g" A: P) ~ A; c/ Fsignal D : std_logic_vector(1 downto 0);
0 k3 b# y7 ~- ? y4 @ d1 nsignal ks1,kok : boolean;
5 u! b, D1 E2 o" j+ vBegin
7 [# M% P) K8 \/ T! G3 ~lt<=c1 nor c2;
4 b. j' U5 ~* L1 J
* ?! P6 y# k4 ^freqprocess(clk) 8 z) d. \3 p1 a5 ^" u8 H) b
variable ff : std_logic_vector(16 downto 0);
: B3 F4 g# c3 B# z4 {7 SBegin' m" X% |6 P3 `# ?$ G! Y! j
if (clk'event and clk='1') then# d. D( [, U% A: V+ y" p% F
ff:=ff+1;
1 V9 r+ Z! M; ^ end if;3 v* i# p" [ x. e I
l_p<=ff(12);
5 n& r& g6 \( b9 U" e d_b<=ff(13);
' L9 i Q4 A" W2 Y5 T) l( F count<=ff(15); 3 Y/ v' _* L7 w- P& Y1 E
end process freqp;- [0 g: t: a) I: ]7 a1 Y( \
% `5 M5 o8 b( g% ]debrocess(d_b)
: U8 Z! ?+ r$ D( b! l' `variable c : std_logic_vector(1 downto 0);
9 q! W: g- H+ RBegin
+ A' t8 B0 N/ s5 G& z- Q if (d_b'event and d_b='1') then
2 l5 ~9 E2 o2 f. I) O" y; A9 | f1 b if (kbi(2) or kbi(1)or kbi(0))='1' then S/ i. z! D, u* ^: l9 i' \9 v
if c="11" then
; M( R4 S( D8 Q( @) i# v- N0 T ena<='1';# @, @. {" I+ z( X/ M, p8 o% L
x2<=kbi(1);
X9 @3 M( x9 A4 m& s G x3<=kbi(0);
% S; W6 O3 t; o; x% a, L2 O' b kok<=false;/ C3 g$ k" X0 [+ g+ V
else 9 S" j# s: L/ r* H
c:=c+1;, H7 B) m) L% [7 O/ K/ r/ k
end if;
; f! }+ v4 Y2 i( e# H% d# r1 R, g9 q elsif (kbi(2) or kbi(1)or kbi(0))='0' then& H, Z0 n2 l+ M3 j8 c- g( M
ena<='0';# ^+ H! _0 L$ o5 G
kok<=true;# V# c- q4 `$ R2 E5 I' R0 e$ s
c:="00"; 0 P' o2 L, ^) R- M. z$ F
end if; h1 ], r, ~5 ^( Q
end if;/ U; E- ~3 N. P! U( X0 k7 h
end process deb;
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counter_scanrocess(count)
/ c$ F$ `) |; c7 ?" Q) v5 {Begin' {9 y! M; _) l R) }, s
if (count'event and count='1') then3 C7 i3 H5 w$ Y
if ena='1' then
2 l4 b n8 x& |" R3 r) f+ r0 k x1<=D(1);
; S% A9 J6 s) { x0<=D(0);
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if D="11" then
# h3 b; B+ ~$ P1 N7 d2 r, m D<="00";
( U- P& R$ A- X3 U& p else
, ], h. z! _2 O/ ?1 S/ l* Y% N D<=D+1;
' L" J. Z6 v/ I7 ]9 e8 ^0 ] end if;) p: E; m V# M! T
end if;
" e& s+ }/ T8 f0 z/ M* _ end if;
( A8 Z4 |5 K3 _9 I+ ~8 Q case D is
4 V$ c% D& P8 r/ }+ M when "00"=>
' U6 |) k/ ~& |% B kscano<="0001";
6 r+ h) x; X9 r+ ? when "01"=>1 j* K. O& t. c8 T/ p2 \" l
kscano<="0010"; 1 Y" r+ Z. V) s+ m
when "10"=>
$ L8 d% L+ k# M6 K1 y/ A kscano<="0100"; 8 V) H+ {6 q. D; y1 b; O
when "11"=>
0 l3 E& P: s" M kscano<="1000";
8 {; x4 ] Q* [: d! {- M when others=>null;! ]$ p8 P* n9 q8 m' z
end case;
9 | O0 x1 v) y- ^; J. N+ u5 gend process counter_scan;
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ld_plsrocess(l_p)+ ^' k. `1 [7 y, M/ \* x
Begin, f# F F" G7 n
if (l_p'event and l_p='1') then" p% ~8 N/ e/ F' ^2 k0 f3 e# d! o
if ena='1' then' ^0 t" }- C0 ]5 i- M, N/ k# S* t
if ks1 then
x( Q T# d) ^4 Z( O7 v p_6<='1';
& W7 T* U, \3 s" n9 j, R7 q( y C p_20<='0';6 E( I& Y) I. |% P: L/ }9 ^
ks1<=false;! U' t' C' T2 S7 b5 I! \9 g F
elsif ks1=false then2 q5 S$ o, X: g
p_6<='0'; ) A T( g* I% d3 o% C \
if p_21='1' then% ]+ S, x! e& R6 N
p_20<='1';
7 C9 S) s+ }. c( o key(3)<=x3;4 C) Q5 R+ {/ P6 o+ ]' J: e- q
key(2)<=x2;5 E; A) O- B& x. b, M
key(1)<=x1;
5 |7 M8 q& B/ y. i( f, F key(0)<=x0;* Z {7 S0 `3 _; A6 u$ Z) B2 `
else% G6 c, l& E4 n% o9 g
p_20<='0';
* o/ G* P9 q( @+ ~& r! t4 S end if;
! X9 j, j0 D. L end if;
* b/ [# z0 _: |/ k5 h7 q elsif kok then
9 h* r6 ?0 p1 d0 T$ r( k) C ks1<=true; , \- q' N2 ~6 P+ ^7 I- @
end if;
. }$ e8 Q+ G, `7 } end if;
, {2 |$ d+ F0 W4 [end process ld_pls;
6 i" P; [6 Q7 O& [# A( ^" y6 M3 S/ ]) yend K_S; |
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