用枚举内型写的简单按键驱动，很方便！

[复制链接]

caizhiwei 发布时间：2015-1-13 08:59

文章
文章封面:	-
文章简介:	-

//按键端口定义，有些电路是上拉,要特别注意原理图sch

//KEY1 : PB12  10K pull down 高电平有效
//KEY2 : PB13  10K pull down 高电平有效
//KEY3 : PB14  10K pull down 高电平有效
//KEY4 : PB15  10K pull down 高电平有效
//

#ifndef __KEY_H) b4 Y- a/ e+ \6 M' X2 N A% I
#define __KEY_H+ q' u( H$ y+ \0 M' J
( _3 T) _4 X; t
#include "stm32f10x.h"3 R0 `% G% d0 v5 |
#include "delay.h"% d/ L3 b6 G8 `0 A
- c0 Z+ {1 Q$ ~6 j! ?6 V7 ]# m
1 X. Q1 B( C4 ?0 o8 V
typedef enum + ?- X. [1 S* x, Z
{
( `) Q( y6 h4 K+ }0 A# w2 {
KEY_NONE = 0X00, //+ [9 G. V9 A2 c& J6 A( I; ?
KEY_UP = 0X10, //
+ r1 |" a' B( @& n3 ?' a0 d3 `
KEY_DOWN = 0x20, //5 r+ A O" w+ p: Z$ h, h4 N0 C4 O3 C
KEY_LEFT = 0x40, //
]" S1 y+ W- \
KEY_RIGHT = 0x80
( w m1 {/ D$ U7 `- M. Z: I+ R
} KeyValue;
! r! ~6 W5 t- f9 c
) x7 W3 w) W2 p3 v6 A0 i; s# ]
" `; P1 t9 \% v# x+ @" W
#define KEY1 GPIO_ReadInputDataBit(GPIOB,GPIO_Pin_12)3 j: @; G I+ X% l8 u/ b; c
#define KEY2 GPIO_ReadInputDataBit(GPIOB,GPIO_Pin_13)
8 R. v' A9 }, Z4 B! {4 `% ~
#define KEY3 GPIO_ReadInputDataBit(GPIOB,GPIO_Pin_14). g2 A0 {7 W: N, k
#define KEY4 GPIO_ReadInputDataBit(GPIOB,GPIO_Pin_15)
' t1 W2 @2 c H6 |1 M' b* p
6 m: Y& ^3 e% r, t* o
void KEY_Init(void);9 J. k% C; P, R2 d! X6 m7 ]9 C% I
KeyValue KEY_Scan(void);
7 g# m# C) N2 J% u9 i
; v+ P, H( |# c
#endif5 @/ B* l+ F& B9 K8 k' \4 g3 b

复制代码

下面是C文件：

#include "key.h"
3 |0 k( M2 I- \
) b" S0 h3 j, ^3 S! K
5 V$ L. W. L4 n
void KEY_Init(void) //IO初始化; N/ o$ r' D6 U8 u8 T$ `
{
% ^( [% H# t. M2 V. ^8 Q* d8 U
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);
2 D1 [. ~0 v( ^; S; P
GPIO_InitTypeDef GPIO_InitStructure; //初始化KEY
& U2 q o% \ [( D: x
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12|GPIO_Pin_13|GPIO_Pin_14|GPIO_Pin_15;1 f- b D# d; B- t
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD; // pull-DOWN input
: N' u) t; M9 n: z
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz; ^ {( L4 |+ ?5 f6 ]
GPIO_Init(GPIOB, &GPIO_InitStructure);9 _- h, j8 [1 K: i0 ` A6 K
4 f0 a. \/ g B5 `, T
}
" _+ u9 }. @5 b: y
! _1 ?! M/ L6 n! Y
+ L7 D8 p5 K- S; J+ m
KeyValue KEY_Scan(void)0 J9 m( y) W/ k5 j
{ ) ?- Q- X$ ~5 j8 `
+ U/ A! m8 A+ @; }
if(KEY1==1||KEY2==1||KEY3==1||KEY4==1) //任意一个按键按下
" L! I- x3 A- O. D2 [0 n( d
{/ w" ?+ I1 [1 G" f* T6 ^/ O
delay_ms(10); //去抖动 ) }, m2 n) [7 V( C1 s5 V: D
* k1 ~" \- C0 d: }- d0 N- A* R, M r
if(KEY1==1)* K, X8 }, N! B/ Z: i
{ 7 R+ c k4 x$ ~' S2 J
return KEY_UP; //keyvalue in your app
% a. O7 s9 Q9 B7 Z& }' D& I
}! k) P m$ F$ P+ h( H
else if(KEY2==1)
3 ]0 t% B" b% a" D) R
{ ! _0 N* ?; ?- f
return KEY_DOWN; //keyvalue in your app 6 u2 ^9 ]* _9 h, Z; g3 f
}
else if(KEY3==1)9 K/ _2 |* \* a* G9 _- Z
{ ( X* M" p1 n5 F6 p- B/ R5 ~
return KEY_LEFT; //keyvalue in your app 3 e; u5 N+ v" d+ K- C* V# O
}4 ?0 j9 _1 \4 F( V; z) N1 t
else if(KEY4==1)
: P6 c/ o( C, s& _$ t
{ 8 d4 ~; C2 C7 ^& E
return KEY_RIGHT; //keyvalue in your app / C3 j& F1 W: N+ Y, X4 C
}
' B' u9 }# F% B, g& b- j5 c
}
# N I" {: c6 ?" g9 U
else //if(KEY1&&KEY2) 3 R) K8 ?: c$ h) I% c+ M
return (KEY_NONE);// 无按键按下
! E" ~3 _; O- X6 s: [6 Y+ j
return KEY_NONE;
4 G: a1 c( N4 U5 P) v3 A- h
}

复制代码

main函数调用：

KeyValue KeyCurrentValue = KEY_NONE;: H/ d/ z9 v9 w; R+ N8 Y
4 h+ \+ W1 |) Q% j( \7 F" O d+ s
KeyCurrentValue = KEY_Scan();* K" @8 Q2 F& \1 [3 W" P
) `- m# k( g( W
if(KeyCurrentValue==KEY_UP)printf("######## The KEY UP is OK ! \r\n");! U* ]: h$ I( [ G; Y+ [: X0 w
if(KeyCurrentValue==KEY_DOWN)printf("######## The KEY DOWN is OK ! \r\n");& _% g; }; d6 L E# G
if(KeyCurrentValue==KEY_LEFT)printf("######## The KEY LEFT is OK ! \r\n");) N% `3 m0 o: @4 _0 i
if(KeyCurrentValue==KEY_RIGHT)printf("######## The KEY RIGHT is OK ! \r\n");