while(1)//把while放到你的主函數里

{

if(key==0) //定義到自己的按鍵

{

run++; //全域性變數

if(run==4)

{

run=1;

}

}

P0=0xff; //這個程式控制的是P0口

switch(run)

{

case 1:

P0=0xfe;

P0=0xfd;

P0=0xfb;

P0=0xf7;

P0=0xef;

P0=0xdf;

P0=0xbf;

P0=0x7f;

break;

case 2:

P0=0x7f;

P0=0xbf;

P0=0xdf;

P0=0xef;

P0=0xf7;

P0=0xfb;

P0=0xfd;

P0=0xfe;

P0=0xff;

break;

case 3:

P0=0xff;

break;

}

}