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下面贴上源代码!
; U E/ |- A" O" D`define UD #1
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module KEY_TEST' [6 a1 a: i6 X$ C/ ]6 X
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//Input ports.
# G) h, X s' ?$ ~9 X' b SYSCLK, - m- v' f5 {5 i8 J8 D w2 S0 e
RST_B,: p" C6 s! w( Q* s% q% }: }- M
KEY_B,/ N( M } }+ }, O" c0 ~
) E; y H8 o; q, O& R //Output ports.
9 O0 g5 P# r. s5 W5 j* c LED_B
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//===========================================================================; {) @, Q: {6 V* H9 s& |% q; V
//Input and output declaration* o, H% g1 d! y! V- c# T
//===========================================================================+ z# L+ r8 p* g0 L; O
5 ], n( U* Q& J4 w) Kinput SYSCLK; //System clock, 50MHz./ A* L3 T J; n- _2 j
input RST_B; //Global reset, low active.# d M! i8 C; s1 S& }1 r: F
input KEY_B; //Key input, low active.
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( P" |- E+ E6 Aoutput LED_B; //Led output, low active., L' n* C0 i, \5 J. u
* z4 c$ R s0 p; T# |* `' s//===========================================================================
& M7 i% b, ?. ^//Wire and reg declaration
3 h# l1 r1 g/ h//===========================================================================0 C; `, ?# o: r6 h+ ?/ w8 k6 N
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wire SYSCLK;+ g9 g' K3 o$ ~
wire RST_B;
; N' g3 b+ t! |9 Q! z: Owire KEY_B;
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reg LED_B;' T4 V5 Y% K h! W& d
. s d% b3 q* P//===========================================================================0 \# B, i. ^4 n
//Wire and reg in the module
0 |; ?* B, Y7 ~2 T' g//===========================================================================7 J# @4 h* R# [: a5 Y, N
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reg [19:0] TIME_CNT; //Counter, count press key time.
, L3 P; D" M4 k! m2 Jreg [1:0] KEY_REG; //Save the input one cycle every 20ms.( N; ?4 P, p) Q0 o$ J% K
reg LED_B_N; //Next value of LED_B.* P7 p6 |" m/ g% g7 s
5 Z' [+ U8 y* M5 o& |% ^wire [19:0] TIME_CNT_N; //Next value of TIME_CNT.& K/ N6 l0 H" o/ V
reg [1:0] KEY_REG_N; //Next value of KEY_REG.0 a% p/ E6 c3 W
4 j. e* {1 S0 t0 N//===========================================================================
z8 T9 S2 Q2 M! q: H//Logic4 h5 z( R6 f( M% U+ @- h+ z( z
//===========================================================================8 @. `0 L+ @( D( w
! ^. U4 o7 O- p, z6 F- t: J//Count the time the key is pressed, free running.
* j' @4 L0 }' Balways @ (posedge SYSCLK or negedge RST_B)7 }! x" E4 M8 I4 }! m1 {1 Z
begin9 @6 S8 x5 P# L6 W/ [" u( ?5 O. z1 _
if(!RST_B)
$ z2 B; o; l" M- a TIME_CNT <= `UD 20'h0;
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TIME_CNT <= `UD TIME_CNT_N;
1 Q! n5 k7 J& J3 Wend
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* D5 C$ h1 {3 _4 Y, d//Count cycle 20ms
& B% z$ C6 {' M) O U: uassign TIME_CNT_N = (TIME_CNT == 20'hf4240) ? 20'h0 : TIME_CNT +1'h1;% i5 N! \; C3 b5 T# j H, G
1 J% ]1 \; P! z' s, z! n% D//Save the key value when some key is press.1 k/ i9 ?: \5 N
always @ (posedge SYSCLK or negedge RST_B)3 t- X3 c4 H+ I4 O7 N& n
begin" v" S' |+ w m/ V
if(!RST_B) D/ w( ]4 Q$ \7 E7 h
KEY_REG <= `UD 2'h3;
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KEY_REG <= `UD KEY_REG_N;
1 Z! W( Z. S( v3 G% Rend
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always @ (*)6 ~ k9 F% f" [. D
begin
+ Z* Y" `2 e O' R+ O5 P if(TIME_CNT == 20'h0)
& p. I; s+ ?1 Q3 l4 ?7 F KEY_REG_N = {KEY_REG[0] , KEY_B};
: U) m( e! A6 W' _8 G else
" Q( l+ v8 d. ~ KEY_REG_N = KEY_REG;8 w' ?6 J! s C. D7 Z
end
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( {( _. N: E7 f//Output control.! _: U! T1 o+ }
always @ (posedge SYSCLK or negedge RST_B)5 M* P; J" U% ?' E# D! c
begin& @" s' L& \; M5 e4 E+ D6 } {
if(!RST_B)
# I5 H% M: s6 a& O3 C" b LED_B <= `UD 1'h1;
8 F; ~6 c& z# M; y& q& D else
/ O. w# B9 j* T+ Z# a) y! o LED_B <= `UD LED_B_N;' c/ g" f" J: w1 P5 V( a
end
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always @ (*)" q9 ]8 Q& |9 I) Q
begin
) y V6 [- i' o& ] if((KEY_REG == 2'b01) && (TIME_CNT == 20'hf4240))
; i# A" x2 u8 N# `* C" V LED_B_N = ~LED_B;
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LED_B_N = LED_B;
, C$ ?+ W3 |$ U1 l* aend
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endmodule
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