这是一个矩阵键盘的扫描函数，之后我想用定义K1 K2 K3方便程序中使用怎么弄？有点像sbit K1=P1^0那种。
{
unsigned char x,y,Key_back=0;
SCAN_IO=0x0f;
if(SCAN_IO！=0x0f)//读取按键是否按下
{
Delay10ms(10);//延时10ms进行消抖
if(SCAN_IO！=0x0f)//再次检测键盘是否按下
{
x = SCAN_IO;
SCAN_IO=0xf0;
y = SCAN_IO;
x = x|y;
switch(x)
{
case(0Xe7): {Key_back=1;}break;
case(0Xeb): {Key_back=2;}break;
case(0Xed): {Key_back=3;}break;
case(0Xee): {Key_back=4;}break;
case(0Xd7): {Key_back=5;}break;
case(0Xdb): {Key_back=6;}break;
case(0xdd): {Key_back=7;}break;
case(0Xde): {Key_back=8;}break;
case(0Xb7): {Key_back=9;}break;
case(0Xbb): {Key_back=10;}break;
case(0Xbd): {Key_back=11;}break;
case(0Xbe): {Key_back=12;}break;
case(0X77): {Key_back=13;}break;
case(0X7b): {Key_back=14;}break;
case(0X7d): {Key_back=15;}break;
case(0X7e): {Key_back=16;}break;
default:Key_back=0;break;
}
}
}
return(Key_back);
}
#include<reg52.h>
#define uint unsigned int
#define uchar unsigned char
sbit dula=P2^6;
sbit wela=P2^7;
sbit key1=P3^4;
uchar code table[]={
0x3f,0x06,0x5b,0x4f,
0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,
0x39,0x5e,0x79,0x71,0};
uchar num,temp,num1;
void delay(uint z)
{
uint x,y;
for(x=z;x>0;x--)
for(y=110;y>0;y--);
}
uchar keyscan();
void display(uchar aa);
void main()
{
num=17;
dula=1;
P0=0;
dula=0;
wela=1;
P0=0xc0;
wela=0;
while(1)
{
display(keyscan());
}
}
void display(uchar aa)
{
dula=1;
P0=table[aa-1];
dula=0;
}
uchar keyscan()
{
P3=0xfe;
temp=P3;
temp=temp&0xf0;
while(temp！=0xf0)
{
delay(5);
temp=P3;
temp=temp&0xf0;
while(temp！=0xf0)
{
temp=P3;
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=P3;
temp=temp&0xf0;
}
}
}
P3=0xfd;
temp=P3;
temp=temp&0xf0;
while(temp！=0xf0)
{
delay(5);
temp=P3;
temp=temp&0xf0;
while(temp！=0xf0)
{
temp=P3;
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=P3;
temp=temp&0xf0;
}
}
}
P3=0xfb;
temp=P3;
temp=temp&0xf0;
while(temp！=0xf0)
{
delay(5);
temp=P3;
temp=temp&0xf0;
while(temp！=0xf0)
{
temp=P3;
switch(temp)
{
case 0xeb:num=9;
break;
case 0xdb:num=10;
break;
case 0xbb:num=11;
break;
case 0x7b:num=12;
break;
}
while(temp！=0xf0)
{
temp=P3;
temp=temp&0xf0;
}
}
}
P3=0xf7;
temp=P3;
temp=temp&0xf0;
while(temp！=0xf0)
{
delay(5);
temp=P3;
temp=temp&0xf0;
while(temp！=0xf0)
{
temp=P3;
switch(temp)
{
case 0xe7:num=13;
break;
case 0xd7:num=14;
break;
case 0xb7:num=15;
break;
case 0x77:num=16;
break;
}
while(temp！=0xf0)
{
temp=P3;
temp=temp&0xf0;
}
}
}
return num;
}