- #define HAVEKEY_PIN 0x0003 //' P- x0 |2 l7 V& l. b: e
- #define KEYPOP 0x0000
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& n7 F3 @+ Q' |% X. ^5 n) N: }# L- #define KEY_START_PRESSED 1 //* K% @5 Y. F/ y; o) F3 M# n; c8 k
2 [! e; p% q+ f& X2 E- typedef struct ( R# \) D! e, V9 h
- {
: }- u+ h6 j _% M - INT8U bLastValue; //
4 }$ J8 c: i2 f7 Y! k- {/ } - INT8U bDebunceTime; //
. d/ v0 I+ d' p9 ~ - INT8U bPressed; //! T! _+ p% w( e; C8 g( }
- INT8U bValue; //2 c5 O# B0 r4 ~0 ^$ u
- INT8U bState; // 2 h) n& @( J" D z( E" L/ g
- } tKEY;
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1. 按键IO口配置
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7 K$ |1 x! H9 d6 q7 p3 I- void KEY_Init(void)# ~- ~! Z/ j: }) [$ c; L; L
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- GPIO_InitTypeDef GPIO_InitStruct;
# i6 x9 q/ G; U" S& J+ ^ - RCC_AHBPeriphClockCmd(RCC_AHBPeriph_KEY_PORT, ENABLE);
, h2 d- M" D9 Z1 J, ^ - GPIO_InitStruct.GPIO_Pin = PAUSE_KEY_PIN | CLEAR_KEY_PIN ;//| ENTER_KEY_PIN | SET_KEY_PIN ;( J s. l, W9 Y0 Q
- GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IN; //GPIO_Mode_AF,GPIO_Mode_OUT! n3 c1 T. a" ^6 v ]" y; J
- GPIO_InitStruct.GPIO_Speed = GPIO_Speed_Level_2;, J# A! V$ o# I8 f
- GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_UP;
6 w2 R* V, f" m; j/ _3 B - GPIO_Init(GPIO_KEY_PORT, &GPIO_InitStruct);
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- memset( &KeyCtrl,0,sizeof(tKEY));
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& R: [: [* B7 R/ z6 p& r& Q2. 按键debunce时间,在timer里调用
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" x+ C4 G v6 y9 x9 D- void KeyCtrlbDebunceTimeDec(void)0 V' I, r$ u. u
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- if(KeyCtrl.bDebunceTime)
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0 _/ P' m' N" J; q& B* Q - KeyCtrl.bDebunceTime--;: v W0 B ?4 O
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- KeyCtrl.bDebunceTime = 20;
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; u/ d+ t, S" p. i* m3. 扫描按键
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; ~) c, H1 R/ i* T- INT8U KeyScan(u8 *bKeyValue)
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- int TempKeyIn;
/ b& v8 A1 b/ X4 l9 \3 m$ o( z - TempKeyIn = GPIO_ReadInputData(GPIO_KEY_PORT);
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8 i3 N" O$ k( p0 c! v3 c- TempKeyIn = GPIO_ReadInputData(GPIO_KEY_PORT) & HAVEKEY_PIN; //get high 8 bit
3 U2 H1 X# p7 V! P a - TempKeyIn = (TempKeyIn ^ 0xffff) & HAVEKEY_PIN;
9 t" n3 J/ Q( v1 j& k6 L - if(TempKeyIn == 0x0000) //no key pressed0 l$ m# r% s& z% Y. @
- {
2 ~3 U8 x e( t( o! `; ~5 J& k - memset( &KeyCtrl,0,sizeof(tKEY)); & D$ R" y1 A) c6 b/ h
- return NOKEY_PRESSED; $ h/ h. a- ~6 t8 f" y' {* z* I) \9 U/ R
- }
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- {
9 |. u! b3 }; r' `% X1 D - if(KeyCtrl.bState != KEY_START_PRESSED) //start key pressed
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) y* c) q" m3 |0 I9 F - KeyCtrl.bState = KEY_START_PRESSED;
! y6 X) j3 l& }- ^5 g - KeyCtrl.bDebunceTime = 20; //10ms
' `/ s- [1 V/ K+ e# n - return NOKEY_PRESSED;& z2 g3 p) S2 Z, J( z+ {; `
- }
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- if(TempKeyIn == KeyCtrl.bLastValue) //lastkey
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: } o# h6 V6 f/ A( w6 g7 g& w - return NOKEY_PRESSED;7 Y5 K4 f% U- V& s) l
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- if(KeyCtrl.bDebunceTime !=0) //debunce time? 10ms9 o6 B/ u3 Z ]: H2 V
- {
- C4 n I9 n, e- {8 L) ] - return NOKEY_PRESSED;
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- KeyCtrl.bLastValue = TempKeyIn;) \2 f0 a" ?5 A0 V
- KeyCtrl.bValue = TempKeyIn;
$ B r- y: ~; B. e8 f- \& ?4 G - *bKeyValue = TempKeyIn;, @8 [* |/ `! k" O5 i
- return KEY_PRESSED;
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- }
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4. 按键处理" X4 s |, X5 F2 Y' K3 z6 ~9 _ }0 G
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- void KeyPro(void)3 ^4 |9 t4 F) x% F3 m, a
- {
7 D2 r9 e; r1 C3 G2 t: T# o - u8 KeyValue;
/ M* @$ ^/ M1 V - if(KeyScan(&KeyValue) == KEY_PRESSED)
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# V7 |0 y6 o9 m. }6 |/ A - if(KeyValue == CLEAR_KEY)
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- ExtiCnt = 0;
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5 |5 |- A) o& \/ K4 R- @) x - else if(KeyValue == PAUSE_KEY)
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3 H2 v3 L. j, S$ N! o7 @- i - PauseFlag = ~PauseFlag;9 u6 H% B, R+ [
- }
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- }
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