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--============================================================& |" d4 A" \% q+ L% V' \! V! \
-- key debounce timer
, Z0 Q# {7 Q. B9 Y--============================================================6 j* O+ E$ S5 l1 q
PROCESS (CLK,RSTn,PB,pb_reg,debounce_counting,debounce_end)
9 `" X4 V: d8 c7 x8 [/ k" N BEGIN) s: h& p, L& w: J! ]
if( RSTn = '0') then
% @ K, W; }% o6 |% m7 w* C/ { debounce_end <= '0';
, e* @: n$ n4 r7 m debounce_counter <= debounce_time;; S' _( ], m0 }" J9 @. l& t
elsif( CLK 'event and CLK ='1')then! b0 K; Q: n4 U5 B- q
if( debounce_counting ='1')then6 {4 ?; W2 W7 T. ~2 g3 u* |& S
if( debounce_count = "1111111111111111")then- l4 ~3 w! S, a. |
debounce_end <= '1';
# L, ?7 V, K' ^1 r debounce_counter <= debounce_time;
* }3 u' @. I4 N5 y else 0 a6 J- y( \& X: g9 @ B" w
debounce_end <= '0';0 F) Z, V; z5 y" _" R5 G
debounce_count = debounce_count+1 ;5 P b$ a5 ]/ I c/ b$ J
end if; ' d- R* a" W: z7 i. Y g
end if;
3 U, i1 N. I5 y$ f" d$ Y% m end if;
. w1 b ], G; X' L$ x8 X8 d
2 g( F( r. a" ~ g--============================================================3 d( c7 p7 I: X6 F5 D$ n# \
-- key function control& _ g, Q" \; M1 h$ U
-- PAUSE -(key push)-> START_COUNT -(key push)-> PAUSE -(key push)-> START_COUNT+ o$ k( j+ W; n+ g' I6 U" ^( {, R5 ~
--============================================================
" \$ I3 e& o; |8 ?) E& t' z PROCESS (CLK,RSTn,pb_reg,debounce_end)
* r1 O8 F' T: Z# V. U2 a BEGIN
5 \% Z; Q0 U) K) `, d" ~$ f if( RSTn = '0') then8 L( U! e# v" R- l$ ~; X2 B
currently_state <= "10"; -- pause6 @' T! Z1 I( F
elsif( CLK 'event and CLK ='1')then
! \$ ]7 }- l% {3 I" Y1 x' H if( debounce_end ='1' and pb_reg ='1')then2 M' M$ t2 v3 m( H) K; l
currently_state <= currently_state(0)& currently_state(1);3 P+ o* t& v( J; }% [2 h
end if; / c( j6 `- ^, v/ H, T
end if; 0 r) ^4 \% K: f) h5 ?
START_COUNT <= currently_state(0);, @+ v5 G/ Y5 i* b' n! U4 F
PAUSE <= currently_state(1);8 `3 N J, F/ U% a% K% L
2 z; U1 Q' i. w. t" }) D1 w# G END PROCESS ;( p0 Y7 z* p; C$ ^) C) ~+ r
END arc; |
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