矩阵键盘代码
#define uchar unsigned char
#define uint unsigned int
sbit dula=P2^6;
sbit wela=P2^7;
uchar code table[]={ 0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,
0x39,0x5e,0x79,0x71};
void delayms(uint xms)
{
uint i,j;
for(i=xms;i>0;i--)
for(j=110;j>0;j--);
}
void display(uchar num)
{
P0=table;
dula=1;
//P0=table;
dula=0;
//delayms(500);
}
void matrixkeyscan()
{
uchar temp,key;
P3=0xfe;
temp=P3;
temp=temp&0xf0;
if(temp != 0xf0)
{
delayms(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;
}
display(key);
}
}
P3=0xfd;
temp=P3;
temp=temp&0xf0;
if(temp != 0xf0)
{
delayms(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;
}
display(key);
}
}
P3=0xfb;
temp=P3;
temp=temp&0xf0;
if(temp != 0xf0)
{
delayms(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;
}
display(key);
}
}
P3=0xf7;
temp=P3;
temp=temp&0xf0;
if(temp != 0xf0)
{
delayms(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;
}
display(key);
}
}
}
void main()
{
P0=0;
dula=1;
dula=0;
P0=0xc0;
wela=1;
//P0=0xc0;
wela=0;
while(1)
{
matrixkeyscan();
}
}
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