矩阵键盘.c

51单片机入门级资料。流水灯

#include<reg52.h>
#define uchar unsigned char
sbit duan=P2^6;
sbit wei=P2^7;
uchar i=0,x=0,y=0,num[8]={16,16,16,16,16,16,16,16},temp;
uchar duantable[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,
0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71,0x00};    //0-F共阴极数码管代码

uchar weitable[]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f};	//0-8位选代码
delay(uchar t)
{
	uchar a,b;
	for(a=t;a>0;a--)
	 for(b=200;b>0;b--);
}
void display()
{
	if(x==8)
		x=0;
	if(y==8)
		y=0;
	P0=0xff;
	wei=1;
	wei=0;
	P0=duantable[num[x]];
	duan=1;
	duan=0;
	P0=weitable[y];
	wei=1;
	wei=0;
	x++;
	y++;
}
main()
{
	while(1)
	{
	display();
	P3=0x7f;
	temp=P3;
	temp=temp&0x0f;
	if(temp!=0x0f)
	{

		delay(50);
		switch(temp)
		{
			case 0x0e:
			 num[i++]=3;
			 break;
			case 0x0d:
			 num[i++]=7;
			 break;
			case 0x0b:
			 num[i++]=11;
			 break;	
			case 0x07:
			 num[i++]=15;
			 break;			
		}
		while(P3!=0x7f)display();	
	}

	display();
	P3=0xbf;
	temp=P3;
	temp=temp&0x0f;
	if(temp!=0x0f)
	{

		delay(50);
		switch(temp)
		{
			case 0x0e:
			 num[i++]=2;
			 break;
			case 0x0d:
			 num[i++]=6;
			 break;
			case 0x0b:
			 num[i++]=10;
			 break;	
			case 0x07:
			 num[i++]=14;
			 break;			
		}
		while(P3!=0xbf)display();	
	}
	display();
	P3=0xdf;
	temp=P3;
	temp=temp&0x0f;
	if(temp!=0x0f)
	{
		
		delay(50);
		switch(temp)
		{
			case 0x0e:
			 num[i++]=1;
			 break;
			case 0x0d:
			 num[i++]=5;
			 break;
			case 0x0b:
			 num[i++]=9;
			 break;	
			case 0x07:
			 num[i++]=13;
			 break;			
		}
		while(P3!=0xdf)display();	
	}
	display();
	P3=0xef;
	temp=P3;
	temp=temp&0x0f;
	if(temp!=0x0f)
	{
		
		delay(50);
		switch(temp)
		{
			case 0x0e:
			 num[i++]=0;
			 break;
			case 0x0d:
			 num[i++]=4;
			 break;
			case 0x0b:
			 num[i++]=8;
			 break;	
			case 0x07:
			 num[i++]=12;
			 break;			
		}
		while(P3!=0xef)
			display();	
	}

	}

}