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#include <reg51.h>
#include <intrins.h>
unsigned char scan_key();
void proc_key(unsigned char key_v);
void delayms(unsigned char ms);
sbit K1 = P0^0; //??????K1
sbit K2 = P0^1; //??????K2
main()
{
unsigned char key_s,key_v;
key_v = 0x03;
P2 = 0xfe;
while(1)
{
key_s = scan_key();
if(key_s != key_v)
{
delayms(10);
key_s = scan_key();
if(key_s != key_v)
{
key_v = key_s;
proc_key(key_v);
}
}
}
}
unsigned char scan_key()
{
unsigned char key_s;
key_s = 0x00;
key_s |= K2;
key_s <<= 1;
key_s |= K1;
return key_s;
}
void proc_key(unsigned char key_v)
{
if((key_v & 0x01) == 0)
{
P2 = _cror_(P2,1);
}
else if((key_v & 0x02) == 0)
{
P2 = _crol_(P2, 1);
}
}
void delayms(unsigned char ms) // ????????
{
unsigned char i;
while(ms--)
{
for(i = 0; i < 120; i++);
}
}
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