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;