请求高人指点一下,自己针对手里的板子做的关于顺序按下矩阵键盘后,在数码管上依次显示0——F,8个数码管同时显示即可。
我已经写好了程序,编译没有问题,但是为什么按键按下去,显示没有按照顺序呢?(我采用的板子是用P0口与74HC573连接做段选,573的是能控制端在P1.0口上,采用P2口做位选,P3口为键盘输入口,)
#include<reg52.h>
#define uchar unsigned char
#define uint unsigned int
#include <intrins.h>
sbit LE = P1^0; //定义输出使能控制脚在P1.0上
uchar code table[] = {0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71}; //段码控制
void delayms(uint xms)
{ uint i,j;
for (i=xms;i>0;i--)
for(j=110;j>0;j--);
}
void display(uchar num)
{
LE=1;
P0=table[num];
LE=0;
}
void matrixkeyscan()
{
uchar temp, key;
P3=0xfe;
temp=P3;
temp=P3&0xf0;
if (temp!=0xf0)
{
delayms(10);
temp=P3;
temp=P3&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=P3&0xf0;
}
display(key);
}
}
P3=0xfd;
temp=P3;
temp=P3&0xf0;
if (temp!=0xf0)
{
delayms(10) ;
temp=P3;
temp=P3&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=P3&0xf0;
}
display(key) ;
}
}
P3=0xfb;
temp=P3;
temp=P3&0xf0;
if (temp!=0xf0)
{
delayms(10);
temp=P3;
temp=P3&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=P3&0xf0;
}
display(key) ;
}
}
P3=0xf7;
temp=P3;
temp=P3&0xf0;
if (temp!=0xf0)
{
delayms(10) ;
temp=P3;
temp=P3&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=P3&0xf0;
}
display(key) ;
}
}
}
void main()
{
LE=1;
P0=0; //关闭所有数码管段选
LE=0;
P2=0x00;//位选中所有数码管
while(1)
{
matrixkeyscan() ;
}
}
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