1 void keyScan(void)
2 {
3 char i;
4 uint8 m;
5 uint8 R0 = 0;
6 TRISB=0x38; //xls 2012-11-26 增加復位鍵RB5
7
8 R0 = PORTB; //RB3,RB4,RB5按鍵讀取
9 R0 &=0x38; //保留鍵值
10 R0 = ~R0; //正邏輯
11 /*以下是RC濾波處理,R0,R1對應於KEY1,KEY2的BUF*/
12 datakey.allkey = (R0>>3);//將讀到的鍵值移至最右端 比如當前在RB1 顧右移一位 如果為RB4 R3則右移3位
13 for (i=0;i<3;i++)//這里根據(jù)有幾個獨立按鍵進行設置 只有一個按鍵時則i=1,三個則i=3
14 {
15 s_kcap[i]=((s_kcap[i]<<3)-s_kcap[i]+(datakey.allkey&0x01)<<4+4)>>3; //rc濾波及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 }
按鍵是接：RB3'4'5 ；沒鍵為高，按下去 為0
1 extern volatile union key datakey;
2 extern volatile union lastkey datalastkey;
3 extern volatile union fistkey datafistkey;
4 //板上按鍵定義
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
一般放主循環(huán)里 10ms或20ms一次
第二種：
1 static volatile bank3 uchar key1 @ 0x6b; //定義十二個按鍵，電平觸發(fā)
2 static volatile bank3 uchar key2 @ 0x6c;
3 static volatile bank3 uchar lkey1 @ 0x6d; //定義十二個按鍵，前沿觸發(fā)
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) //按鍵掃描
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) //有鍵?
57 {
58 if(keycnt>=12)
59 {keycnt=0;
60 key1=R0;key2=R1;
61 }
62 else
63 {key1=lkey1;//lkey1電平值，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 }
第三種：
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;
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