//P0 接八个LED灯；P1接八个独立按键
#include
#define uchar unsigned char
#define BITSET(u,i,v) ( (u) = (u)&~(1<<(i)) | (v)<<(i) )
//将uchar u的第i位设置为布尔值v
#define BITVAL(u,i) ( ( (u)&(1<<(i)) )>0 )
//显示uchar u的第i位，0或1
#define BITCH(u,i) ( BITVAL(u,i)>0 ? BITSET(u,i,0):BITSET(u,i,1) )
//将uchar u的第i位取反
uchar key1;//存储旧的P1
void delay10ms(void)
{
unsigned char a,b,c;
for(c=1;c>0;c--)
for(b=38;b>0;b--)
for(a=130;a>0;a--);
}
void getkey()
{
uchar key2=~P1,i;
if(key2==0 && key1!=0)
{
for(i=0;i<8;i++)
{
if(BITVAL(key1,i)==1)
{BITCH(P0,i);break;}
}
}
key1=key2;
}
void main(void)
{
key1=~P1;
P0=0;
while(1)
{
getkey();
delay10ms();
}
}
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