- #define HAVEKEY_PIN 0x0003 //
( D/ F* a& f+ A0 l8 @9 z' c - #define KEYPOP 0x0000
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- #define KEY_START_PRESSED 1 //
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- typedef struct + s; n3 A( v" E/ ~# Y9 R
- {
" _: S2 a' {" E$ d - INT8U bLastValue; //
& c1 N+ l1 ] _' M, T/ j8 H: L - INT8U bDebunceTime; //( ]& ?9 ]* A* J$ [, M- _; U
- INT8U bPressed; //$ U& u5 Q8 N! {, D- ]
- INT8U bValue; /// q9 B1 p! D$ F$ o4 L4 U
- INT8U bState; //
|% M* `6 A& z; }3 H$ c& Q( E - } tKEY;
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1. 按键IO口配置4 a- S8 i I( m% X
$ n; B1 e0 ~2 y4 p: F- void KEY_Init(void)$ b4 K, ?8 ?9 X, \3 A9 o5 J
- {
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- r7 O1 G5 S' l. j- GPIO_InitTypeDef GPIO_InitStruct;4 Q9 P! R8 u& c S. k6 a) B0 r
- RCC_AHBPeriphClockCmd(RCC_AHBPeriph_KEY_PORT, ENABLE);
+ b+ @8 q. `1 e% { |$ L) j& C - GPIO_InitStruct.GPIO_Pin = PAUSE_KEY_PIN | CLEAR_KEY_PIN ;//| ENTER_KEY_PIN | SET_KEY_PIN ;
8 o) P: d% O$ J! P( _) n! E - GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IN; //GPIO_Mode_AF,GPIO_Mode_OUT
: d- V" i) B& H/ n7 x+ w4 _ - GPIO_InitStruct.GPIO_Speed = GPIO_Speed_Level_2;5 x6 h0 i! M6 h& h: i4 o) A, c$ ?
- GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_UP;
5 J$ k/ y( B* Y# L9 @$ b* ? - GPIO_Init(GPIO_KEY_PORT, &GPIO_InitStruct);
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1 \( r! R0 W) R' b) C8 l- memset( &KeyCtrl,0,sizeof(tKEY));& z9 u6 D' ^5 E1 J
- }
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9 g5 O# @6 B4 y5 Z2. 按键debunce时间,在timer里调用8 i6 f6 k# g$ Z# B1 |- [
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- void KeyCtrlbDebunceTimeDec(void). w0 k- L4 o4 ]% `' J8 r" T
- {, c: [$ O8 x ]4 Y: V' ^
- if(KeyCtrl.bDebunceTime)) d, \9 a# H( S9 G0 k) Q F
- {
3 Q' ]2 a. l- N* @* L. n, p - KeyCtrl.bDebunceTime--;' h8 m( `& |1 I
- }
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- {
& `6 P5 D8 H2 o - KeyCtrl.bDebunceTime = 20;
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- }
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' E5 l# f; H7 {: ?0 |3. 扫描按键. W9 i. ^: e5 C5 c7 @
( |" v% x" A& D! K% }7 D1 w/ Q- INT8U KeyScan(u8 *bKeyValue)
- Q7 i/ _+ @" e. y - {
( @, L A8 x7 n( G - int TempKeyIn;
6 ?/ }. }( h! I - TempKeyIn = GPIO_ReadInputData(GPIO_KEY_PORT);
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- TempKeyIn = GPIO_ReadInputData(GPIO_KEY_PORT) & HAVEKEY_PIN; //get high 8 bit
`+ }; _5 k* s/ e8 B: R: ]7 ]6 z - TempKeyIn = (TempKeyIn ^ 0xffff) & HAVEKEY_PIN;
# ]( t' ?# Y% T* D" W' T) n - if(TempKeyIn == 0x0000) //no key pressed$ V/ z, y% f; E; F
- {% A' `/ e# g6 `. `& ?4 ^( h, ?- E
- memset( &KeyCtrl,0,sizeof(tKEY)); 8 w5 d, w; b; A3 u: j. X" z- l
- return NOKEY_PRESSED;
& u+ f: t4 e$ @$ l3 c% p - }
5 X. y% D" u) W: b7 E1 q - else
) N" D) \% y0 e7 W+ [7 ^ - {
; F O! m4 o7 k- m3 ?- e - if(KeyCtrl.bState != KEY_START_PRESSED) //start key pressed
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- KeyCtrl.bState = KEY_START_PRESSED;* E" X1 M3 r) d9 h/ |) f% C
- KeyCtrl.bDebunceTime = 20; //10ms2 M5 J4 l8 t6 |6 V% d' ^: ~
- return NOKEY_PRESSED;
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- else
8 v& G0 F& M! q6 J3 u - {
9 j# U, j, T8 q- k9 N5 m$ U8 |0 H - if(TempKeyIn == KeyCtrl.bLastValue) //lastkey
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. |+ _% X9 I% i Q k/ p - return NOKEY_PRESSED;
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% h$ W7 x0 j1 W; K* v - else
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- if(KeyCtrl.bDebunceTime !=0) //debunce time? 10ms
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- return NOKEY_PRESSED;
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- else
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" H6 Z3 U5 U* H5 g( q: o( ?5 s# @4 i" ~ - KeyCtrl.bLastValue = TempKeyIn;8 E2 G+ H! ]5 K! q: _
- KeyCtrl.bValue = TempKeyIn;
7 h3 b- u: |! c: m - *bKeyValue = TempKeyIn;" E1 L+ [: z! R! U& _/ J, y
- return KEY_PRESSED;
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- }
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- }. w. j. T. \( r( R# t
- }
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! \0 b7 v2 D. T* {( _' g2 p4. 按键处理
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: _* ]. D/ _8 |/ U- Z" X- void KeyPro(void)2 H# n, C9 ^0 m1 e3 B
- {
2 F% U2 P/ R; D$ I# u - u8 KeyValue;( [; m h. E$ F4 G4 d
- if(KeyScan(&KeyValue) == KEY_PRESSED)$ B! p, j4 s( ?% u
- {
& s- X" b+ N2 U0 f! I - if(KeyValue == CLEAR_KEY)
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- ExtiCnt = 0;$ r v6 H3 _4 R M" q! H' B
- }
/ X5 | b+ V' Q: G* ` - else if(KeyValue == PAUSE_KEY)
4 b! t+ g+ |# t# A- e& ^+ ?3 f - {
: \# f! ^. ~! b) ^ P% h% V - PauseFlag = ~PauseFlag;( Q/ _$ A! @) D3 n2 E" Q7 c
- }1 \$ r' B( I! g( _+ C
- }
- C0 [& \3 O" d7 R% J - }
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