- #define HAVEKEY_PIN 0x0003 //
: X2 u8 p3 {- ~1 V3 \# n - #define KEYPOP 0x0000
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- #define KEY_START_PRESSED 1 //$ _4 T5 y* ^) l4 X
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- INT8U bLastValue; //: \) y7 Y! W/ q7 c. |
- INT8U bDebunceTime; //
) w; U7 t/ R+ U# R6 V1 C; i0 ? - INT8U bPressed; //3 }* _. q/ Q4 k
- INT8U bValue; //
; i( j* y% B! j" N$ b% }/ s - INT8U bState; // 2 e, Z& X) f% D- N: F+ I
- } tKEY;
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1. 按键IO口配置6 ?4 c3 F! B* J( F
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- void KEY_Init(void)) Y7 v! a9 {: U0 ?
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- s- k! Z5 b. d, X- GPIO_InitTypeDef GPIO_InitStruct;
- K, g# z/ K1 w+ D# u) A: V - RCC_AHBPeriphClockCmd(RCC_AHBPeriph_KEY_PORT, ENABLE);* z: M8 a. H2 J. r- c. c5 r
- GPIO_InitStruct.GPIO_Pin = PAUSE_KEY_PIN | CLEAR_KEY_PIN ;//| ENTER_KEY_PIN | SET_KEY_PIN ;9 l4 k; K1 ^9 h p. c1 G P
- GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IN; //GPIO_Mode_AF,GPIO_Mode_OUT
6 b: w2 ^, x( \5 ? - GPIO_InitStruct.GPIO_Speed = GPIO_Speed_Level_2;9 R) m( W d5 j! o$ _7 \; Q
- GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_UP;/ t( s. Z; k# }
- GPIO_Init(GPIO_KEY_PORT, &GPIO_InitStruct);
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- memset( &KeyCtrl,0,sizeof(tKEY));
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2. 按键debunce时间,在timer里调用
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- void KeyCtrlbDebunceTimeDec(void): A2 b. ^6 z- e1 z: ]
- {
! L6 b1 j) S2 d; i0 Z' R( X - if(KeyCtrl.bDebunceTime) w, h3 r& @: L( `7 ]1 q
- {
6 m; z8 D8 E0 H - KeyCtrl.bDebunceTime--;/ x* Y3 I$ U0 `- ]* C
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- else
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- KeyCtrl.bDebunceTime = 20;
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- }
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; O3 r! m) y; L9 x% i3. 扫描按键4 ~ R& h( g) T. {# q2 z3 k
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- INT8U KeyScan(u8 *bKeyValue)
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' y" G3 }& r/ u. [4 O1 a& n - int TempKeyIn;, h5 E5 n/ D1 `( z6 v7 i
- TempKeyIn = GPIO_ReadInputData(GPIO_KEY_PORT);9 i! u y2 K8 b4 ~1 n" a
- 3 {) `. P! ?7 J0 h& r
- TempKeyIn = GPIO_ReadInputData(GPIO_KEY_PORT) & HAVEKEY_PIN; //get high 8 bit: O. ?+ N! V! ]2 n+ A
- TempKeyIn = (TempKeyIn ^ 0xffff) & HAVEKEY_PIN;
( F& c2 e2 R) @( @ - if(TempKeyIn == 0x0000) //no key pressed5 ~ S2 k1 {. x
- {
+ |2 u3 R" `2 Q4 e% n$ j' C% j - memset( &KeyCtrl,0,sizeof(tKEY));
& y. m1 w& {" {8 U1 L - return NOKEY_PRESSED; ' [7 c" b6 t+ X
- }
9 Y7 T1 f5 m9 N# x4 A' n$ T$ G - else, ]* [/ B" T C5 J4 V% l. t
- {
+ H' j* p& N% Z - if(KeyCtrl.bState != KEY_START_PRESSED) //start key pressed
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- KeyCtrl.bState = KEY_START_PRESSED;+ d5 p/ H J3 l7 ^' G
- KeyCtrl.bDebunceTime = 20; //10ms9 h7 L$ j9 X! W! W" i u% g
- return NOKEY_PRESSED;4 n5 t; d6 @4 M: ^$ @
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- else
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- if(TempKeyIn == KeyCtrl.bLastValue) //lastkey
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- return NOKEY_PRESSED;' X/ F; E3 t$ x+ Y
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- else
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& O$ {: H9 n1 Z; q% q) H; B5 p" D - if(KeyCtrl.bDebunceTime !=0) //debunce time? 10ms5 o% c: R6 E# ^6 T
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- return NOKEY_PRESSED;
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- KeyCtrl.bLastValue = TempKeyIn;5 A& _7 i& E' H
- KeyCtrl.bValue = TempKeyIn;
! l# {( B2 i. r( n+ _8 M9 t - *bKeyValue = TempKeyIn;3 {4 w0 P \( v6 ~. p) W
- return KEY_PRESSED;3 c- _1 r/ m7 h' A6 h/ G+ q
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- }
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4. 按键处理+ q* f2 c6 O( ]" a4 X
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- void KeyPro(void)
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! \4 F9 u/ C3 S- I- q) {3 O6 C3 R+ D - u8 KeyValue;: L9 K) K+ r2 S$ U5 r
- if(KeyScan(&KeyValue) == KEY_PRESSED)" I( B' r2 r$ T# W; f
- {
. G- {+ y, l- @! Y - if(KeyValue == CLEAR_KEY)
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- ExtiCnt = 0;
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- else if(KeyValue == PAUSE_KEY)
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- PauseFlag = ~PauseFlag;5 F( Y+ Z: @3 @$ [, s* w. }% e
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- }
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