- #define HAVEKEY_PIN 0x0003 //
7 s- D* {9 g+ {/ x& U$ w/ C- _) G- g4 W - #define KEYPOP 0x0000( t4 H& Z6 ]8 [1 Y
" B: T$ R' L, y7 K8 j- #define KEY_START_PRESSED 1 //
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+ M, H* l1 G" R( N! }7 I- typedef struct 7 A' g/ n( W* Q& y5 z. g
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- INT8U bLastValue; //
, C9 A/ a" a; l% n5 R- a( C - INT8U bDebunceTime; //" D& {! q8 N% z( {9 d
- INT8U bPressed; //
: [/ I& W/ v6 m# _1 | - INT8U bValue; //
: c4 c/ a% Y& }7 F - INT8U bState; //
# w) E# f+ w: `# ?3 P: s" S7 t Z - } tKEY;
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2 P8 w `! m* c2 \. S5 m: ~4 Q1. 按键IO口配置
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- void KEY_Init(void)
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- GPIO_InitTypeDef GPIO_InitStruct;. Q6 O4 s( Z3 }+ }( ^: [
- RCC_AHBPeriphClockCmd(RCC_AHBPeriph_KEY_PORT, ENABLE);
7 Y8 I2 ~/ D( l - GPIO_InitStruct.GPIO_Pin = PAUSE_KEY_PIN | CLEAR_KEY_PIN ;//| ENTER_KEY_PIN | SET_KEY_PIN ;
* I, F. Z( s5 c) r0 l - GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IN; //GPIO_Mode_AF,GPIO_Mode_OUT
0 D9 _/ w( ?" L! Q8 x! { I+ B - GPIO_InitStruct.GPIO_Speed = GPIO_Speed_Level_2;4 z1 h# |# f5 F. J: ]) ~
- GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_UP;7 u% e8 M% p4 e4 Q& c; p
- GPIO_Init(GPIO_KEY_PORT, &GPIO_InitStruct);3 h1 |* T7 Z0 b% @
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- memset( &KeyCtrl,0,sizeof(tKEY));
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: H* i* n; z4 M; @+ J% Q) n2. 按键debunce时间,在timer里调用
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- void KeyCtrlbDebunceTimeDec(void)
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1 G+ i" ?0 W% S) `0 F - if(KeyCtrl.bDebunceTime)
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- KeyCtrl.bDebunceTime--;
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! a$ V" v8 k) _* z0 D - else
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/ ?6 Q9 A# I1 I( y7 Z6 j7 I - KeyCtrl.bDebunceTime = 20;
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3. 扫描按键
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- W& q8 U3 Q. B# R3 E3 ]9 B+ d- INT8U KeyScan(u8 *bKeyValue)
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; O3 x! b- v0 s" X* G/ I- V2 M - int TempKeyIn;. \" Y# J2 n3 O
- TempKeyIn = GPIO_ReadInputData(GPIO_KEY_PORT);
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0 E2 F, Z& o9 `2 d5 N2 g- TempKeyIn = GPIO_ReadInputData(GPIO_KEY_PORT) & HAVEKEY_PIN; //get high 8 bit) m9 }1 z& [1 k, {0 z
- TempKeyIn = (TempKeyIn ^ 0xffff) & HAVEKEY_PIN;% `% N. g7 H8 k3 |
- if(TempKeyIn == 0x0000) //no key pressed
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, W" I2 P* e7 T) _% Q8 _* w: } - memset( &KeyCtrl,0,sizeof(tKEY)); 0 j# _( p0 g$ H/ t/ `
- return NOKEY_PRESSED; & g2 G* `, l7 i5 f9 f' O
- }
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- if(KeyCtrl.bState != KEY_START_PRESSED) //start key pressed, T Q8 B" V; ^6 U! O& a
- {
! Z" j" d+ m0 `4 j/ b - KeyCtrl.bState = KEY_START_PRESSED;
% S; m: O1 o, w4 m |( ~8 W - KeyCtrl.bDebunceTime = 20; //10ms/ _# c" g5 \( N; b% x5 W5 g6 t9 X
- return NOKEY_PRESSED;* `9 C+ [7 b8 y" ^3 w! e4 K$ Y7 W: Z
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- else
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- if(TempKeyIn == KeyCtrl.bLastValue) //lastkey D/ `* T2 ~1 K" A! m# e5 e
- {
! Y* K) z, `) [$ ~5 b" m+ U - return NOKEY_PRESSED;& N% f/ F6 P( A+ z% w% Z! z' H
- }
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% U& N# X8 p* t% p. S7 `% g - if(KeyCtrl.bDebunceTime !=0) //debunce time? 10ms0 D# T" O+ v3 V8 I* R
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- return NOKEY_PRESSED;
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- KeyCtrl.bLastValue = TempKeyIn;1 G: }) }/ R2 `* }' }
- KeyCtrl.bValue = TempKeyIn;
* c+ [1 K& _% Y' `$ n& D - *bKeyValue = TempKeyIn;
3 r. k5 K( K7 R; j- \- e; G - return KEY_PRESSED;
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- }
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; J1 p3 p. }% p ?+ Y4. 按键处理6 b( e" p8 {4 w3 k/ D$ Z3 M
# ]1 s6 h% p" ~- void KeyPro(void)
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- u8 KeyValue;" w% k/ l/ F) j1 T" B+ S, V3 C$ R
- if(KeyScan(&KeyValue) == KEY_PRESSED)" l0 |0 ~* w+ ~( J' H3 m% c
- {
* z6 n/ F6 G. s8 t$ _9 Y - if(KeyValue == CLEAR_KEY)
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- ExtiCnt = 0;* w/ s" L0 M9 q- V4 @
- }
+ V8 I% ?# @# `& k0 a2 Q - else if(KeyValue == PAUSE_KEY)- t) Q0 s& M2 a
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- PauseFlag = ~PauseFlag;/ V9 F0 ^ C' M; ^
- }$ p. x& P( y6 ` F* {
- }
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