单片机共阳矩阵键盘（含原理图、程序） -

#include<reg51.h>
#define uchar unsigned char
sbit L1=P1^0;
sbit L2=P1^1;
sbit L3=P1^2;
sbit L4=P1^3;
uchar dis[16]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0x88,0x83,0xc6,0xa1,0x86,0x8e};
unsigned int time;
delay(time)
{
unsigned int j;
for(j=0;j<time;j++)
{ }
}
main()
{
uchar temp;
uchar k,i;
while(1)
{
P1=0xef;
for(i=0;i<=3;i++)
{
if(L1==0) P0=dis[i*4+0];
if(L2==0) P0=dis[i*4+1];
if(L3==0) P0=dis[i*4+2];
if(L4==0) P0=dis[i*4+3];
delay(500);
temp=P1;
temp=temp|0x0f;
temp=temp<<1;
temp=temp|0x0f;
P1=temp;
}
}
}

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