中断扫描矩阵键盘89c51

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1、/*自动1231班31号唐继*/#includeunsignedchartable[]={0x7c,0x06,0x66,0x7f,0x7d,0x5b,0x6d,0x07,0x39,0x5e,0x77,0x79,0x4f,0x6f,0x71,0x3f};voiddelay(unsignedchari){unsignedcharx,j;for(j=0;j

2、g=0;scan=0xef;P1=0x0f;for(n=0;n<4;n++){P1=scan;temp=~P1;temp=temp&0x0f;col=n;flag=1;if(temp==0x01){rol=0;break;}elseif(temp==0x02){rol=1;break;}elseif(temp==0x04){rol=2;break;}elseif(temp==0x08){rol=3;break;}elseflag=0;scan=(scan<<1)+1;}if(flag==0)return-1;elsereturn(rol*4+co

3、l);}voidscankeyled()interrupt2{unsignedchari,key;key=scankey();while(i!=-1){delay(20);i=scankey();}P2=0x00;delay(20);P0=table[key];P2=0x01;delay(20);}voidmain(){while(1){EA=1;EX1=1;IT1=0;P0=0xff;P1=0x0f;}}