//4*4键盘检测程序,按下键后相应的代码显示在数码管上
#include<reg51.h>
sbit beep=P2^3
sbit dula=P2^6
sbit wela=P2^7
unsigned char i=100
unsigned char j,k,temp,key
void delay(unsigned char i)
{
for(j=ij>0j--)
for(k=125k>0k--)
}
unsigned char code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,
0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71}
display(unsigned char num)
{
P0=table[num]
dula=1
dula=0
P0=0xc0
wela=1
wela=0
}
void main()
{
dula=0
wela=0
while(1)
{
P3=0xfe
temp=P3
temp=temp&0xf0
if(temp!=0xf0)
{
delay(10)
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
beep=0
}
beep=1
display(key)
P1=0xfe
}
}
P3=0xfd
temp=P3
temp=temp&0xf0
if(temp!=0xf0)
{
delay(10)
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
beep=0
}
beep=1
display(key)
}
}
P3=0xfb
temp=P3
temp=temp&0xf0
if(temp!=0xf0)
{
delay(10)
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
beep=0
}
beep=1
display(key)
}
}
P3=0xf7
temp=P3
temp=temp&0xf0
if(temp!=0xf0)
{
delay(10)
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
beep=0
}
beep=1
display(key)
}
}
}
}
每个switch语句后加一句while(temp!=0x0f)
{
temp=P3
temp=temp&0xf0
}
即：按键松手检测
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