如何實現矩陣鍵盤自由靈活控制數碼管顯示數字

矩陣鍵盤 能實現 多個按鍵 連接少量I/O口， 矩陣鍵盤，按下一個鍵 即可 使 數碼管顯示相應數字

#include

unsigned char code table[10]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x10};

unsigned char t=0;

unsigned char i=0;

void Delay(unsigned char i)

{

unsigned char j;

for(; i>0; i--)

for(j=110; j>0; j--);

}

void DisplayLED(unsigned char n)

{

P0=table[n];

}

void Keycan() //判斷 矩陣鍵盤是否被按下

{

unsigned char tmp, key;

P2=0xfe; //第四列

tmp=P2;

tmp=tmp&0xf0;

if(tmp!=0xf0)

{

Delay(10); //

tmp=P2;

tmp=tmp&0xf0;

if(tmp!=0xf0)

{

tmp=P2;

switch(tmp)

{

case 0xee: TR0=1; // 啟動定時器T0

break;

case 0xde: key=8; //

break;

case 0xbe: key=4; /

break;

}

while(tmp!=0xf0)

{

tmp=P2;

tmp=tmp&0xf0;

}

if(tmp!=0xee)

{

DisplayLED(key);

}

}

}

P2=0xfd; //第三列

tmp=P2;

tmp=tmp&0xf0;

if(tmp!=0xf0)

{

Delay(10); //

tmp=P2;

tmp=tmp&0xf0;

if(tmp!=0xf0)

{

tmp=P2;

switch(tmp)

{

case 0xed: TR0=0, key=i; // 停止定時器T0

break;

case 0xdd: key=7; //

break;

case 0xbd: key=3; //

break;

}

while(tmp!=0xf0)

{

tmp=P2;

tmp=tmp&0xf0;

}

DisplayLED(key);

}

}

P2=0xfb; //第二列

tmp=P2;

tmp=tmp&0xf0;

if(tmp!=0xf0)

{

Delay(10); //

tmp=P2;

tmp=tmp&0xf0;

if(tmp!=0xf0)

{

tmp=P2;

switch(tmp)

{

case 0xeb: key=0 ; //

break;

case 0xdb: key=6; //

break;

case 0xbb: key=2; //

break;

}

while(tmp!=0xf0)

{

tmp=P2;

tmp=tmp&0xf0;

}

DisplayLED(key);

}

}

P2=0xf7; //第一列

tmp=P2;

tmp=tmp&0xf0;

if(tmp!=0xf0)

{

Delay(10); //

tmp=P2;

tmp=tmp&0xf0;

if(tmp!=0xf0)

{

tmp=P2;

switch(tmp)

{

case 0xe7: key=9 ; //

break;

case 0xd7: key=5; /

break;

case 0xb7: key=1; //

break;

}

while(tmp!=0xf0)

{

tmp=P2;

tmp=tmp&0xf0;

}

DisplayLED(key);

}

}

}

void main()

{

TMOD=0x01;

EA=1;

ET0=1;

TR0=1;

TH0=(65536-50000)/256;

TL0=(65536-50000)%256;

while(1)

{

Keycan();

if(t==20)

{

t=0;

P0=table[i];

Delay(1000);

i++;

if(i==10)

{

i=0;

}

}

}

}

void TimerLED() interrupt 1 using 1

{

TH0=(65536-50000)/256;

TL0=(65536-50000)%256;

t++;

}