#include<reg52.h>
sbit dula=P2^6;
sbit wela=P2^7;
unsigned char table[]=
{0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,
0x39,0x5e,0x79,0x71};
unsigned char temp,num;
void keyscan();
void delay(int z);
void display();
void main()
{
P0=0;
dula=1;dula=0;
P0=0xc0;
wela=1;
wela=0;
while(1)
{
keyscan();
display();
}
}
void delay(int z)
{
int x,y;
for(x=z;x>0;x--)
for(y=110;y>0;y--);
}
void keyscan()
{
P3=0xfe;
temp=P3;
temp=0xf0&temp;
if(temp!=0xf0)
{
delay(10);
temp=P3;
temp=0xf0&temp;
if(temp!=0xf0)
{
temp=P3;
switch(temp)
{
case 0x7e: num=0; break;
case 0xbe: num=1; break;
case 0xde: num=2; break;
case 0xee: num=3;break;
}
while(temp!=0xf0)
{
temp=P3;
temp=temp&0xf0;
}
}
}
P3=0xfd;
temp=P3;
temp=0xf0&temp;
if(temp!=0xf0)
{
delay(10);
temp=P3;
temp=0xf0&temp;
if(temp!=0xf0)
{
temp=P3;
switch(temp)
{
case 0x7d: num=4; break;
case 0xbd: num=5; break;
case 0xdd: num=6; break;
case 0xed: num=7;break;
}
while(temp!=0xf0)
{
temp=P3;
temp=temp&0xf0;
}
}
}
P3=0xfb;
temp=P3;
temp=0xf0&temp;
if(temp!=0xf0)
{
delay(10);
temp=P3;
temp=0xf0&temp;
if(temp!=0xf0)
{
temp=P3;
switch(temp)
{
case 0x7b: num=8; break;
case 0xbb: num=9; break;
case 0xdb: num=10; break;
case 0xeb: num=11;break;
}
while(temp!=0xf0)
{
temp=P3;
temp=temp&0xf0;
}
}
}
P3=0xf7;
temp=P3;
temp=0xf0&&temp;
if(temp!=0xf0)
{
delay(10);
temp=P3;
temp=0xf0&&temp;
if(temp!=0xf0)
{
temp=P3;
switch(temp)
{
case 0x77: num=12; break;
case 0xb7: num=13; break;
case 0xd7: num=14; break;
case 0xe7: num=15;break;
}
while(temp!=0xf0)
{
temp=P3;
temp=temp&0xf0;
}
}
}
}
void display()
{
P0=table[num];
dula=1;
dula=0;
}
这个程序是想通过按16个按键其中的一个，来从数码管上显示一个数，可是只有0~7实现了，8~15数码管都没反应
------解决方案--------------------
P3=0xf7;
temp=P3;
temp=0xf0&&temp;//两个“&&”了
if(temp!=0xf0)
{
delay(10);
temp=P3;
temp=0xf0&&temp;//两个“&&”了
if(temp!=0xf0)
{
temp=P3;
switch(temp)
{
case 0x77: num=12; break;
case 0xb7: num=13; break;
case 0xd7: num=14; break;
case 0xe7: num=15;break;
}
while(temp!=0xf0)
------解决方案--------------------
按位与 ： & 。