- #define HAVEKEY_PIN 0x0003 //' q' \" u5 u. m! E5 t& \$ R
- #define KEYPOP 0x0000
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5 h5 y# a5 a' R6 J7 R5 v- #define KEY_START_PRESSED 1 //3 C6 \' x. L- ]$ B
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- typedef struct - _% n9 r4 z+ f6 Q
- {
9 K8 W7 R' J2 ~! w5 g - INT8U bLastValue; //
7 b' ~( ~+ P. w& I: Y' k" V( ^. [( P6 K - INT8U bDebunceTime; /// Z5 S2 f! }* L; ^
- INT8U bPressed; //* |9 X' z* C% u; Q! M# F
- INT8U bValue; //6 O$ ^% l; ]. l, y* J
- INT8U bState; // ; @9 ^% X3 N9 a0 a) @- d! }
- } tKEY;
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1. 按键IO口配置
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/ a2 I, _. f, }6 Z5 @; d. Q- void KEY_Init(void): |# \0 k( g1 C- x
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- GPIO_InitTypeDef GPIO_InitStruct;
' w9 Y/ z3 V" ^0 d; M6 A - RCC_AHBPeriphClockCmd(RCC_AHBPeriph_KEY_PORT, ENABLE);
. B6 X# [- |: [9 _ - GPIO_InitStruct.GPIO_Pin = PAUSE_KEY_PIN | CLEAR_KEY_PIN ;//| ENTER_KEY_PIN | SET_KEY_PIN ;6 M1 A/ @5 |% l7 a4 J
- GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IN; //GPIO_Mode_AF,GPIO_Mode_OUT
+ M/ }! g* O- N - GPIO_InitStruct.GPIO_Speed = GPIO_Speed_Level_2;
* b2 ]0 f; d; ]/ t. Q2 a - GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_UP;
, `0 E: j, H8 [) D- `- w - 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! v# e8 z; @) S; J( I5 e* j' q
+ Y4 t9 m# ]( ]% f" f2 w- void KeyCtrlbDebunceTimeDec(void)1 E! w( t9 i$ J6 L8 c6 j2 Y
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- if(KeyCtrl.bDebunceTime), x, b' b: U. c) r4 A6 G
- {
7 q& h9 G7 I* I5 V# ^$ u - KeyCtrl.bDebunceTime--;
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- KeyCtrl.bDebunceTime = 20;2 K/ ]' _. r0 y% B/ s/ A. F7 r
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- }
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3. 扫描按键8 a7 @" O5 t1 i. s; J& I1 `
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- INT8U KeyScan(u8 *bKeyValue)
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- i0 B# W \9 [ - int TempKeyIn;
$ p' W: J& }. H+ ^, ]7 S - TempKeyIn = GPIO_ReadInputData(GPIO_KEY_PORT);
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% a2 j# v4 h9 U9 }: Q& r$ ]- TempKeyIn = GPIO_ReadInputData(GPIO_KEY_PORT) & HAVEKEY_PIN; //get high 8 bit& ~' p9 F6 v: p5 L
- TempKeyIn = (TempKeyIn ^ 0xffff) & HAVEKEY_PIN;& z" R$ R4 T0 C5 a% s
- if(TempKeyIn == 0x0000) //no key pressed6 U* G/ Y' B/ E! m
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- memset( &KeyCtrl,0,sizeof(tKEY));
1 j/ c' g: }, H# d5 K, ] - return NOKEY_PRESSED; 9 B1 k8 j6 T) O% n0 o2 x& O. w, }1 l2 k
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- if(KeyCtrl.bState != KEY_START_PRESSED) //start key pressed( X! @ t9 k9 z4 u
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- KeyCtrl.bState = KEY_START_PRESSED;
9 M! ~1 W' S7 A/ m - KeyCtrl.bDebunceTime = 20; //10ms
" q/ a3 z* B5 p# u. |8 R& J" x. r - return NOKEY_PRESSED;2 J* x* F8 q4 |, `
- }
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- if(TempKeyIn == KeyCtrl.bLastValue) //lastkey$ G) u1 L: Z$ A- k; R# f3 ^
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- return NOKEY_PRESSED;
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* X) l7 {. i1 G' x' c( i' F - else2 w# S( ?- h1 \% @6 N( Y# u! f% f/ ]
- {
# I: w2 x h; U8 N - if(KeyCtrl.bDebunceTime !=0) //debunce time? 10ms! B7 ~) j& y- q# y" D' q0 D7 q1 b
- {( A# l! E. ^% ?" J
- return NOKEY_PRESSED;% [% Y6 j7 x7 j4 ~7 T( N! u
- }
9 y4 d/ _% Z3 l4 g- u; E - else
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% g: W% N) ^+ u( m/ ` - KeyCtrl.bLastValue = TempKeyIn;5 P2 D" e3 x2 G9 S2 O
- KeyCtrl.bValue = TempKeyIn;
% N; ~7 G7 @- F" r7 h* m - *bKeyValue = TempKeyIn;
. R- s4 X% Y. \. I7 P - return KEY_PRESSED;! Y5 r7 Y6 A+ |% B! J" }
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- }
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- T4 [$ R1 m! @6 L { - }
M8 Y& y# \: I/ B - }
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4. 按键处理6 {- m& u7 @( z; L2 n) ~: E! c! q
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- void KeyPro(void)
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- u8 KeyValue;
, g% C2 Q2 t4 y2 P - if(KeyScan(&KeyValue) == KEY_PRESSED)
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3 x! x$ J w# O/ r0 p! n9 R - if(KeyValue == CLEAR_KEY)
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T2 O% N3 b* l0 C! ]1 P! \* j& ] - ExtiCnt = 0;
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- else if(KeyValue == PAUSE_KEY)
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- ~' v6 m4 T$ x: r6 r5 ?+ M - PauseFlag = ~PauseFlag;* [+ t! g. B7 A9 V/ s. i
- }
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