数码管显示4×4键盘矩阵按键.doc

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1、9数码管显示4×4键盘矩阵按键#include#defineucharunsignedchar#defineuintunsignedintsbitBEEP=P3^7;ucharcodeDSY_CODE[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0x88,0x83,0xc6,0xa1,0x86,0x8e,0x00};ucharPre_KeyNO=16,KeyNO=16;voidDelayMS(uintms){uchart;while(

2、ms--){for(t=0;t<120;t++);}}voidKeys_Scan(){ucharTmp;P1=0x0f;DelayMS(1);Tmp=P1^0x0f;switch(Tmp){case1:KeyNO=0;break;case2:KeyNO=1;break;case4:KeyNO=2;break;case8:KeyNO=3;break;default:KeyNO=16;}P1=0xf0;DelayMS(1);Tmp=P1>>4^0x0f;switch(Tmp){case1:KeyNO+=0;break

3、;case2:KeyNO+=4;break;case4:KeyNO+=8;break;case8:KeyNO+=12;}}voidBeep(){uchari;for(i=0;i<100;i++){DelayMS(1);BEEP=~BEEP;}BEEP=1;}voidmain(){P0=0x00;while(1){P1=0xf0;if(P1!=0xf0)Keys_Scan();if(Pre_KeyNO!=KeyNO){P0=~DSY_CODE[KeyNO];Beep();Pre_KeyNO=KeyNO;}Delay

4、MS(100);}}