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K1-K4 控制LED移位
源程序：
- #include <reg52.h>
- #include <intrins.h>
- #define uchar unsigned char
- #define uint unsigned int
- void DelayMS(uint x)
- {
- uchar i;
- while(x--)
- {
- for(i=200;i>0;i--);
- }
- }
- void Move_LED()
- {
- if((P1 &= 0x10)==0) P0 = _cror_(P0,1);
- else if((P1 &= 0x20)==0) P0 = _crol_(P0,1);
- else if((P1 &= 0x40)==0) P2 = _cror_(P2,1);
- else if((P1 &= 0x80)==0) P2 = _crol_(P2,1);
- }
- void main()
- {
- uchar Recent_Key=0xff;
- P0=0xfe;
- P1=0xfe;
- P2=0xfe;
- while(1)
- {
- if(Recent_Key != P1)
- {
- Recent_Key=P1;
- Move_LED();
- DelayMS(10);
- }
- }
- }
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