寫過一段時間單片機程序，也看了一些單片機程序，書上的，網(wǎng)上的，基本都是非常原始的讀取按鍵，延時判斷，這些按鍵相關(guān)代碼穿插于整個程序，著實不夠美觀，最重要的是不能復(fù)用，so俺就想做個按鍵框架，只需提供按鍵處理代碼即可，言歸正傳，先簡介一下幾個文件，ringfifo.c提供了一個簡單的環(huán)形緩沖隊列，用以通知按鍵消息，key.c 實現(xiàn)的按鍵的框架處理(讀取按鍵,調(diào)用按鍵處理函數(shù)），key_port.c 需提供底層硬件接口及用戶的按鍵處理函數(shù)，目前支持的按鍵消息類型有4類：keyDown,keyRelease,longPress, double click.

key.h中提供了4個函數(shù):InitKey()為初始化,KeyProc() 須在主循環(huán)中調(diào)用,KeyScan()須定時(10-20ms)調(diào)用，SetKeyHandler()用來設(shè)置按鍵處理函數(shù)

key.h

1 #ifndef __KEY_H__

2 #define __KEY_H__

3

4 #define NULL 0

5

6 typedef enum{

7 KEY_EVENT_DOWN = 0,

8 KEY_EVENT_UP,

9 KEY_EVENT_LONGPRESS,

10 KEY_EVENT_DOUBLECLICK,

11 KEY_EVENT_COMBO_KEYDOWN,

12 }KeyEventType;

13

14 typedef void (*pKeyEventCB)(void *para);

15

16 typedef struct _tagKeyInfo

17 {

18 unsigned char keyCode;

19 unsigned char keyStatus;

20 unsigned char comboKeyFlag;

21 unsigned int keyDbClickTime;

22 unsigned int keyDownTime;

23 unsigned int keyRepeatTime;

24 pKeyEventCB FuncCB[5];

25 void * para[5];

26 }KeyInfo;

27

28 typedef struct _tagMessageInfo

29 {

30 unsigned int keyEvent;

31 unsigned int keyCode;

32 KeyInfo* pContext;

33 }MessageInfo;

34

35

36

37 void InitKey(void); //

38

39 void KeyProc(void);// call this func in main loop

40

41 void KeyScan(void); // call it in timer service, 20ms

42

43 pKeyEventCB SetKeyHandler(unsigned char key,KeyEventType event,pKeyEventCB pFunc,void *para);

44

45 #endif

key.c

1#include"key_port.h"2#include"key.h"3#include"ringfifo.h"4#include56#defineKEY_STATE_UP0X07#defineKEY_STATE_DOWN0X38#defineKEY_STATE_LONGRESS0XF9#defineKEY_STATE_RELEASE0XC1011staticKeyInfokInfo[KEY_AMOUNT];12staticRingFifoMsgQ;131415voidPostMessage(MessageInfo*pMsg)16{17PushFifo(&MsgQ,pMsg);18}1920unsignedcharGetMessage(MessageInfo*pMsg)21{22returnPopFifo(&MsgQ,pMsg);23}2425//callitintimerservice26voidKeyScan(void)27{28inti=0;29unsignedcharc=0;30KeyInfo*pInfo=kInfo;31MessageInfoMsg;32for(i=0;i