keyscan.c.bak

矩阵按键程序

#include<AT89X51.H>
#define uchar unsigned char
#define uint unsigned int

void delaynms(uint  n)
{uchar i;
while(n--)
        {for(i=0;i<125;i++);
        }
}

void Beep(uchar b)
{if(b==0)
        P3_6=0;
 else 
        P3_6=1;
        
}

void BeepOnShort()
{
Beep(0);
delaynms(200);
Beep(1);
}


uchar GetKey()
{uchar temp,key=0xff;
P2=0x0f;
temp=P2;
if(temp!=0x0f)
	{delaynms(50);
		temp=P2;
		if(temp!=0x0f)
			{	
			P2=0xef;
			temp=P2;
			switch (temp)
				{
				case 0xe7:key=0;break;
				case 0xeb:key=1;break;
				case 0xed:key=2;break;
				case 0xee:key=3;break;
				default:break;
				}

			P2=0xdf;
			temp=P2;
			switch (temp)
				{
				case 0xd7:key=4;break;
				case 0xdb:key=5;break;
				case 0xdd:key=6;break;
				case 0xde:key=7;break;
				default:break;
				}
	
			P2=0xbf;
			temp=P2;
			switch (temp)
				{
				case 0xb7:key=8;break;
				case 0xbb:key=9;break;
				case 0xbd:key=10;break;
				case 0xbe:key=11;break;
				default:break;
				}
	
			P2=0x7f;
			temp=P2;
			switch (temp)
				{
				case 0x77:key=12;break;
				case 0x7b:key=13;break;
				case 0x7d:key=14;break;
				case 0x7e:key=15;break;
				default:break;
				}
			while(P2&0x0f!=0x0f)
			{;}

			if (key!=0xff)
			BeepOnShort();
			}
	}
	return key;
}

void KeyProcess()
{uchar key=0xff;
key=GetKey();
if(key==0)P1_0=~P1_0;
else if(key==1)P1_1=~P1_1;
else if(key==2)P1_2=~P1_2;
else if(key==3)P1_3=~P1_3;
else if(key==4)P1_4=~P1_4;
else if(key==5)P1_5=~P1_5;
else if(key==6)P1_6=~P1_6;
else if(key==7)P1_7=~P1_7;

else if(key==8){P1_0=~P1_0;P1_1=~P1_1;}
else if(key==9){P1_1=~P1_1;P1_2=~P1_2;}
else if(key==11){P1_2=~P1_2;P1_3=~P1_3;}
else if(key==11){P1_3=~P1_3;P1_4=~P1_4;}
else if(key==12){P1_4=~P1_4;P1_5=~P1_5;}
else if(key==13){P1_5=~P1_5;P1_6=~P1_6;}
else if(key==14){P1_6=~P1_6;P1_7=~P1_7;}
else if(key==15)P1=~P1;

}

main()
{BeepOnShort();
while(1)
KeyProcess();
 }