要求是按下一个键后,发光二极管点亮,再按一下熄灭,键盘为矩阵键盘,P1口接矩阵键盘,P2口接发光二极管(共阳极),控制8个LED。自己写了一个程序,但达不到预想的效果,按一下点亮,再按一下并不熄灭,程序如下,求大神指出错误。。
#include<reg51.h>
#define uint unsigned int
#define uchar unsigned char
sbit D1=P2^7;
sbit D2=P2^6;
sbit D3=P2^5;
sbit D4=P2^4;
sbit D5=P2^3;
sbit D6=P2^2;
sbit D7=P2^1;
sbit D8=P2^0;
uchar num,temp,LED;
void delay(uint z)
{
uint x,y;
for(x=z;x>0;x--)
for(y=110;y>0;y--);
}
uchar keyscan();
void main()
{
while(1)
{
LED=keyscan();
switch(LED)
{
case 1:D1=!D1;LED=0;
break;
case 2:D2=!D2;LED=0;
break;
case 3:D3=!D3;LED=0;
break;
case 4:D4=!D4;LED=0;
break;
case 5:D5=!D5;LED=0;
break;
case 6:D6=!D6;LED=0;
break;
case 7:D7=!D7;LED=0;
break;
case 8:D8=!D8;LED=0;
break;
}
}
}
uchar keyscan()
{
P1=0xfe;
temp=P1;
temp=temp&0xf0;
while(temp!=0xf0)
{
delay(5);
temp=P1;
temp=temp&0xf0;
while(temp!=0xf0)
{
temp=P1;
switch(temp)
{
case 0xee:num=1;
break;
case 0xde:num=2;
break;
case 0xbe:num=3;
break;
case 0x7e:num=4;
break;
}
while(temp!=0xf0)
{
temp=P1;
temp=temp&0xf0;
}
}
}
P1=0xfd;
temp=P1;
temp=temp&0xf0;
while(temp!=0xf0)
{
delay(5);
temp=P1;
temp=temp&0xf0;
while(temp!=0xf0)
{
temp=P1;
switch(temp)
{
case 0xed:num=5;
break;
case 0xdd:num=6;
break;
case 0xbd:num=7;
break;
case 0x7d:num=8;
break;
}
while(temp!=0xf0)
{
temp=P1;
temp=temp&0xf0;
}
}
}
return num;
}