三种按键处理函数

1 void keyScan(void)

2 {

3 char i;

4 uint8 m;

5 uint8 R0 = 0;

6 TRISB=0x38; //xls 2012-11-26 增加复位键RB5

7

8 R0 = PORTB; //RB3,RB4,RB5按键读取

9 R0 &=0x38; //保留键值

10 R0 = ~R0; //正逻辑

11 /*以下是RC滤波处理,R0,R1對應於KEY1,KEY2的BUF*/

12 datakey.allkey = (R0>>3);//将读到的键值移至最右端 比如当前在RB1 顾右移一位 如果为RB4 R3则右移3位

13 for (i=0;i<3;i++)//这里根据有几个独立按键进行设置 只有一个按键时则i=1,三个则i=3

14 {

15 s_kcap[i]=((s_kcap[i]<<3)-s_kcap[i]+(datakey.allkey&0x01)<<4+4)>>3; //rc滤波及4舍5入

16 datakey.allkey>>=1;

17 if (s_kcap[i]>12)

18 {

19 datakey.allkey|=0x80;

20 }

21 }

22 m=datakey.allkey;

23 datakey.allkey=(datalastkey.allkey^datakey.allkey) &datalastkey.allkey;//後沿處理

24 datalastkey.allkey=m;

25

26 //datakey.allkey=(datalastkey.allkey^datakey.allkey)&datakey.allkey; //前沿處理

27 //datalastkey.allkey=m;

28 }

按键是接：RB3'4'5 ；没键为高，按下去 为0

1 extern volatile union key datakey;

2 extern volatile union lastkey datalastkey;

3 extern volatile union fistkey datafistkey;

4 //板上按键定义

5 #define K2 (datakey.allkey&0x40)

6 #define K3 (datakey.allkey&0x80) //

7 #define K1 (datakey.allkey&0x20) //

8

9 #define LK2 (datalastkey.allkey&0x40)

10 #define LK3 (datalastkey.allkey&0x80) //extern volatile union var key;

11 #define LK1 (datalastkey.allkey&0x20)

1 #ifndef _MYDEFINE_H

2 #define _MYDEFINE_H

3

4 #define BIT bit

5 #define uint8 unsigned char

6 #define uint16 unsigned int

7 #define uint32 unsigned long int

8

9 #define BT_CFG2_6 RA0

10 #define BT_CFG1_6 RA2

11 #define ON_OFF_SLEEP_WAKE_B RA3

12

13 #define _ON 1

14 #define _OFF 0

15 #define _TRUE 1

16 #define _FLASE 0

17

18 #define _PRINTF _OFF

19

20 #define Acsii(x) x+0x30

一般放主循环里 10ms或20ms一次

第二种：

1 static volatile bank3 uchar key1 @ 0x6b; //定义十二个按键，电平触发

2 static volatile bank3 uchar key2 @ 0x6c;

3 static volatile bank3 uchar lkey1 @ 0x6d; //定义十二个按键，前沿触发

4 static volatile bank3 uchar lkey2 @ 0x6f;

5

6 static volatile bit k0 @ (unsigned)&key1*8+0;

7 static volatile bit k1 @ (unsigned)&key1*8+1;

8 static volatile bit k2 @ (unsigned)&key1*8+2;

9 static volatile bit k3 @ (unsigned)&key1*8+3;

10 static volatile bit k4 @ (unsigned)&key1*8+4;

11 static volatile bit k5 @ (unsigned)&key1*8+5;

12 static volatile bit k6 @ (unsigned)&key1*8+6;

13 static volatile bit k7 @ (unsigned)&key1*8+7;

14

15 static volatile bit k8 @ (unsigned)&key2*8+0;

16 static volatile bit k9 @ (unsigned)&key2*8+1;

17 static volatile bit k10 @ (unsigned)&key2*8+2;

18 static volatile bit k11 @ (unsigned)&key2*8+3;

19

20 static volatile bit lk0 @ (unsigned)&lkey1*8+0;

21 static volatile bit lk1 @ (unsigned)&lkey1*8+1;

22 static volatile bit lk2 @ (unsigned)&lkey1*8+2;

23 static volatile bit lk3 @ (unsigned)&lkey1*8+3;

24 static volatile bit lk4 @ (unsigned)&lkey1*8+4;

25 static volatile bit lk5 @ (unsigned)&lkey1*8+5;

26 static volatile bit lk6 @ (unsigned)&lkey1*8+6;

27 static volatile bit lk7 @ (unsigned)&lkey1*8+7;

28

29 static volatile bit lk8 @ (unsigned)&lkey2*8+0;

30 static volatile bit lk9 @ (unsigned)&lkey2*8+1;

31 static volatile bit lk10 @ (unsigned)&lkey2*8+2;

32 static volatile bit lk11 @ (unsigned)&lkey2*8+3;

33

34 uchar keycnt;

35

36 void keyscan(void) //按键扫描

37 {

38 keycnt++;

39 xs0=xs1=xs2=xs3=xs4=xs5=xs6=xs7=RD7=0; //

40

41 TRISD=0X0F; //

42

43 RD6=1;RD5=0;RD4=1; //(k4~k7)

44 asm("nop");asm("nop");

45 R0=(RD^0X0f)&0x0f;

46 R0=R0<<4;

47

48 RD4=0;RD5=1;RD6=1; //(k0~k3)

49 asm("nop");asm("nop");

50 R0+=((RD^0X0F)&0X0F);

51

52 RD6=0;RD5=1;RD4=1; //(k8~k11

53 asm("nop");asm("nop");

54 R1=(RD^0X0f)&0x0f;

55

56 if(R0|R1) //有键?

57 {

58 if(keycnt>=12)

59 {keycnt=0;

60 key1=R0;key2=R1;

61 }

62 else

63 {key1=lkey1;//lkey1电平值，key1，前沿值

64 key2=lkey2;

65 }

66 }

67 else

68 {key1=key2=0;

69 keycnt=0;

70 }

71 R2=key1;R3=key2;

72 key1=key1&(lkey1^key1); lkey1=R2;

73 key2=key2&(lkey2^key2); lkey2=R3;

74 }

第三种：

1 BOOL Switch2IsPressed(void)

2 {

3 if(sw2 != old_sw2)

4 {

5 old_sw2 = sw2; // Save new value

6 if(sw2 == 0) // If pressed

7 return TRUE; // Was pressed

8 }//end if

9 return FALSE; // Was not pressed

10 }//end Switch2IsPressed

11

12

13 typedef enum _BOOL { FALSE = 0, TRUE } BOOL;