tx51单片机4×4矩阵按键在数码管上显示0-15

**

**
代码如下：

#include
#define uchar unsigned char
#define uint unsigned int
sbit duan=P2^6;
sbit wei=P2^7;
uchar key;
uchar code table[]={0x3f,0x06,0x5b,0x4f,
					0x66,0x6d,0x7d,0x07,
					0x7f,0x6f};
void yanshi(uint x)
{
uint a,b;
for(a=x;a>0;a--)
for(b=110;b>0;b--);
}
void xianshi()//显示函数
{
wei=1;
P0=0xfe;
wei=0;
duan=1;
P0=table[key/10];
duan=0;
P0=0xff;
yanshi(5);
	
wei=1;
P0=0xfd;
wei=0;
duan=1;
P0=table[key%10];
duan=0;
P0=0xff;
yanshi(5);

}
void keyscan()//键盘扫描函数
{
uchar temp;

P3=0xfe;
temp=P3;
temp=temp&0xf0;
if(temp!=0xf0)
{
 yanshi(10);
 temp=P3;
 temp=temp&0xf0;
 if(temp!=0xf0)
 {
	temp=P3;
	switch(temp)
	{
		case 0xee: key=0;break;
		case 0xde: key=1;break;
		case 0xbe: key=2;break;
		case 0x7e: key=3;break;
	}
	while(temp!=0xf0)
	{
		temp=P3;
		temp=temp&0xf0;
		xianshi();
	}
	}
}
 
P3=0xfd;
temp=P3;
temp=temp&0xf0;
if(temp!=0xf0)
{
 yanshi(10);
 temp=P3;
 temp=temp&0xf0;
 if(temp!=0xf0)
 {
	temp=P3;
	switch(temp)
	{
		case 0xed: key=4;break;
		case 0xdd: key=5;break;
		case 0xbd: key=6;break;
		case 0x7d: key=7;break;
	}
	while(temp!=0xf0)
	{
		temp=P3;
		temp=temp&0xf0;
		xianshi();
	}
	}
}

P3=0xfb;
temp=P3;
temp=temp&0xf0;
if(temp!=0xf0)
{
 yanshi(10);
 temp=P3;
 temp=temp&0xf0;
 if(temp!=0xf0)
 {
	temp=P3;
	switch(temp)
	{
		case 0xeb: key=8;break;
		case 0xdb: key=9;break;
		case 0xbb: key=10;break;
		case 0x7b: key=11;break;
	}
	while(temp!=0xf0)
	{
		temp=P3;
		temp=temp&0xf0;
		xianshi();
	}
	}
}

P3=0xf7;
temp=P3;
temp=temp&0xf0;
if(temp!=0xf0)
{
 yanshi(10);
 temp=P3;
 temp=temp&0xf0;
 if(temp!=0xf0)
 {
	temp=P3;
	switch(temp)
	{
		case 0xe7: key=12;break;
		case 0xd7: key=13;break;
		case 0xb7: key=14;break;
		case 0x77: key=15;break;
	}
	while(temp!=0xf0)
	{
		temp=P3;
		temp=temp&0xf0;
		xianshi();
	}
	}
}
}
void main()
{
	
TMOD=0x01;
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
EA=1;
ET0=1;
TR0=1;	
while(1)
{
	xianshi();
}
}

void t0_time()interrupt 1
{
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
keyscan();
}

注：这里在等待按键释放程序中加入了显示函数，避免按键按下时数码管不显示；
这里单独使用了中断来扫描keyscan；
标注不完全，如有错误，还请指正；