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;