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Key function7 h. p5 o( r8 E: I
按鍵開關 第一次 on時,開始計時。
3 p! y, n' e, U$ L2 W, I1 n' R 第二次 on時,停止計時。
a1 Z4 y5 m9 [ 第三次 on時,開始計時。; c8 H& ], y. R# [; m+ V2 ~7 j0 C
未 synthesis,請自行 debug........
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LIBRARY ieee; # K; t8 r# M/ Z" z9 `1 C1 ~# V& M, F* g
USE ieee.std_logic_1164.all;7 t/ u; N, p. {, T/ J
USE ieee.std_logic_unsigned.all;
; U, t% k! f4 I! mENTITY KeyFunction IS8 `' b7 B/ p% l( G2 D: ]3 [. S
PORT(CLK,
/ `4 V$ x6 V! A, x4 _ PB,
I4 q$ h9 X, M( p- f* i RSTn : IN STD_LOGIC;' ~) t2 X$ _( ?% Q. V
START_COUNT,% q5 [) g$ h( m: n
PAUSE# P% c. g4 m. X$ y/ V8 C& C
: OUT STD_LOGIC + r |) i8 q7 Z( C% K: C" o B1 m
);
3 v: _$ B7 F! h1 J L/ G' W! qEND KeyFunction;7 M' m/ d. F! J. }* _' s; l2 e2 }" K' `
ARCHITECTURE arc OF debounce_v IS1 @* H9 |! @- a$ r2 | N% U
SIGNAL currently_state : STD_LOGIC_VECTOR(2 downto 0);
% Q" h& f- {/ l4 vsignal pb_reg,debounce_counting,debounce_end : std_logic;8 Y6 p2 t S2 f
signal debounce_counter : STD_LOGIC_VECTOR(15 downto 0);
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constant debounce_time : STD_LOGIC_VECTOR(15 downto 0):= "0000000000000000";8 Z3 t/ [& ]% a! Q
BEGIN9 R# ~7 _( n1 a, _4 P1 I) J/ j
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--============================================================# f+ O9 R& P) {. \; }/ Z$ V0 L
-- get key push state. ( active high)4 g0 l" R' |; k4 h4 Z# p8 v
--============================================================9 L4 Y e K/ X- r: R# y
PROCESS (CLK,RSTn,PB,pb_reg,debounce_counting,debounce_end)
T# V+ G, e1 P J5 w( n BEGIN5 S$ X8 z% U/ P B% t
if( RSTn = '0') then
1 `+ ]6 D ~- O pb_reg <= 1;: G2 F: A, m" n
elsif( CLK 'event and CLK ='1')then
D$ w( |7 i" p( M- [) y if( PB='1' and pb_reg ='0')then4 z4 W5 ~8 y/ p. V4 B
debounce_counting <= '1';
2 f7 z$ T# v7 O5 D) H. b& g elsif( debounce_end = '1')then
: u8 C2 S: j- s( Y6 r debounce_counting <= '0'; 5 X1 A* a5 |5 A( w/ m1 G
else
. j& r% h9 I9 v. T- q5 \ debounce_counting <= debounce_counting;
2 u: C% v7 J7 @2 N; t( y1 F) _; n end if;
/ \$ l1 ~2 M1 C9 D+ Z' g% e& d pb_reg <= PB; # f- _# j+ O; a- n+ i0 b+ m
end if; |
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