用枚举内型写的简单按键驱动，很方便！

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caizhiwei 发布时间：2015-1-13 08:59

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//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
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#define __KEY_H7 X" d6 i3 D* L. a( \! n
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#include "stm32f10x.h"
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#include "delay.h"; K( Q( w3 o! T& ~) f J
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typedef enum 7 D0 U& B7 [$ ]
{
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KEY_NONE = 0X00, //6 R. I- {# u l" ^
KEY_UP = 0X10, //" U6 O: ] M+ V( ~: T
KEY_DOWN = 0x20, //
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KEY_LEFT = 0x40, //
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KEY_RIGHT = 0x80
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} KeyValue;2 h# c$ W( \4 P+ z! h! ?( v! M
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#define KEY1 GPIO_ReadInputDataBit(GPIOB,GPIO_Pin_12)2 w8 M _# n4 {8 D( w$ f
#define KEY2 GPIO_ReadInputDataBit(GPIOB,GPIO_Pin_13)
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#define KEY3 GPIO_ReadInputDataBit(GPIOB,GPIO_Pin_14)
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#define KEY4 GPIO_ReadInputDataBit(GPIOB,GPIO_Pin_15); d: G3 {: x; W; d8 T5 `
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void KEY_Init(void);$ x0 z; s3 {, A5 R. |0 U
KeyValue KEY_Scan(void);
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#endif, Y4 I0 W+ O$ @6 ~ }$ e; v

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下面是C文件：

#include "key.h"
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void KEY_Init(void) //IO初始化0 L* a1 f. M5 T! ?% s: g: w
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE); 4 M- v1 t% w& Z9 t5 D
GPIO_InitTypeDef GPIO_InitStructure; //初始化KEY% b9 d# g5 k) v
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12|GPIO_Pin_13|GPIO_Pin_14|GPIO_Pin_15;* w6 U& G. i$ m: c$ ?" k
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD; // pull-DOWN input
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;) a2 J9 L" `" ^
GPIO_Init(GPIOB, &GPIO_InitStructure);
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}
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KeyValue KEY_Scan(void)
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if(KEY1==1||KEY2==1||KEY3==1||KEY4==1) //任意一个按键按下2 c) ]6 l4 L" C8 C2 F
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delay_ms(10); //去抖动 ) ?+ ~; b; L4 l4 s) i6 y
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if(KEY1==1)2 d8 g- ^& w l6 D' i# O
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return KEY_UP; //keyvalue in your app
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else if(KEY2==1)
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return KEY_DOWN; //keyvalue in your app 9 o! v# M4 W3 e) ^% W
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else if(KEY3==1)
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return KEY_LEFT; //keyvalue in your app ' O. \! U# i( J9 H# O
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else if(KEY4==1)( Y) e- o+ _- v- Q: q- e
{
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return KEY_RIGHT; //keyvalue in your app + i. [) X1 K2 ^, m% a
}
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}
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else //if(KEY1&&KEY2)
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return (KEY_NONE);// 无按键按下$ G- d9 i$ f' G! D' C# B
return KEY_NONE;; ?4 V! \; j7 t, U
}

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main函数调用：

KeyValue KeyCurrentValue = KEY_NONE;
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KeyCurrentValue = KEY_Scan();% _5 S0 [+ |. g1 R/ L3 M
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if(KeyCurrentValue==KEY_UP)printf("######## The KEY UP is OK ! \r\n");- R8 L: |8 _* z6 [- k
if(KeyCurrentValue==KEY_DOWN)printf("######## The KEY DOWN is OK ! \r\n");
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if(KeyCurrentValue==KEY_LEFT)printf("######## The KEY LEFT is OK ! \r\n");4 O, }9 m4 `: N+ {( B ^' @" Y
if(KeyCurrentValue==KEY_RIGHT)printf("######## The KEY RIGHT is OK ! \r\n");