51單片機(jī) 矩陣按鍵的掃描、消抖、動(dòng)作分離

#include

sbitADDR0=P1^0;

sbitADDR1=P1^1;

sbitADDR2=P1^2;

sbitADDR3=P1^3;

sbitENLED=P1^4;

sbitKEY_IN_1=P2^4;

sbitKEY_IN_2=P2^5;

sbitKEY_IN_3=P2^6;

sbitKEY_IN_4=P2^7;

sbitKEY_OUT_1=P2^3;

sbitKEY_OUT_2=P2^2;

sbitKEY_OUT_3=P2^1;

sbitKEY_OUT_4=P2^0;

codeunsignedcharLedChar[]={//數(shù)碼管顯示字符轉(zhuǎn)換表

0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,

0x80,0x90,0x88,0x83,0xC6,0xA1,0x86,0x8E

};

unsignedcharKeySta[4][4]={//全部矩陣按鍵的當(dāng)前狀態(tài)

{1,1,1,1},

{1,1,1,1},

{1,1,1,1},

{1,1,1,1}

};

voidmain(){

unsignedchari,j;

unsignedcharbackup[4][4]={//按鍵值備份，保存前一次的值

{1,1,1,1},

{1,1,1,1},

{1,1,1,1},

{1,1,1,1}

};

EA=1;//使能總中斷

ENLED=0;//選擇數(shù)碼管DS1進(jìn)行顯示

ADDR3=1;

ADDR2=0;

ADDR1=0;

ADDR0=0;

TMOD=0x01;//設(shè)置T0為模式1

TH0=0xFC;//為T0賦初值0xFC67，定時(shí)1ms

TL0=0x67;

ET0=1;//使能T0中斷

TR0=1;//啟動(dòng)T0

P0=LedChar[0];//默認(rèn)顯示0

while(1){

for(i=0;i<4;i++){//循環(huán)檢測(cè)4*4的矩陣按鍵

for(j=0;j<4;j++){

if(KeySta[i][j]!=backup[i][j]){//檢測(cè)按鍵動(dòng)作

if(KeySta[i][j]==0){//按鍵按下時(shí)執(zhí)行動(dòng)作

P0=LedChar[i*4+j];//將編號(hào)顯示到數(shù)碼管

}

backup[i][j]=KeySta[i][j];//更新前一次的備份值

}

}

}

}

}

/*T0中斷服務(wù)函數(shù)，掃描矩陣按鍵狀態(tài)并消抖*/

voidInterruptTimer0()interrupt1{

unsignedcharj;

staticunsignedchari=0;//矩陣按鍵掃描輸出索引

staticunsignedcharkeybuf[4][4]={//矩陣按鍵掃描緩沖區(qū)

{0xFF,0xFF,0xFF,0xFF},

{0xFF,0xFF,0xFF,0xFF},

{0xFF,0xFF,0xFF,0xFF},

{0xFF,0xFF,0xFF,0xFF}

};

TH0=0xFC;//重新加載初值

TL0=0x67;

//將一行的4個(gè)按鍵值移入緩沖區(qū)

keybuf[i][0]=(keybuf[i][0]<<1)|KEY_IN_1;

keybuf[i][1]=(keybuf[i][1]<<1)|KEY_IN_2;

keybuf[i][2]=(keybuf[i][2]<<1)|KEY_IN_3;

keybuf[i][3]=(keybuf[i][3]<<1)|KEY_IN_4;

//消抖后更新按鍵狀態(tài)

for(j=0;j<4;j++){//每行4個(gè)按鍵，所以循環(huán)4次

if((keybuf[i][j]&0x0F)==0x00){//連續(xù)4次掃描值為0，即4*4ms內(nèi)都是按下狀態(tài)時(shí)，可認(rèn)為按鍵已穩(wěn)定的按下

KeySta[i][j]=0;

}

elseif((keybuf[i][j]&0x0F)==0x0F){//連續(xù)4次掃描值為1，即4*4ms內(nèi)都是彈起狀態(tài)時(shí)，可認(rèn)為按鍵已穩(wěn)定的彈起

KeySta[i][j]=1;

}

}

//執(zhí)行下一次的掃描輸出

switch(i){//根據(jù)索引，釋放當(dāng)前輸出引腳，拉低下次的輸出引腳

case0:KEY_OUT_1=1;KEY_OUT_2=0;break;

case1:KEY_OUT_2=1;KEY_OUT_3=0;break;

case2:KEY_OUT_3=1;KEY_OUT_4=0;break;

case3:KEY_OUT_4=1;KEY_OUT_1=0;break;

default:break;

}

i=++i&0x03;

}