P0=0xFF;
switch(n)
{
// case 0:P2=0x7F;P0=LedBuff[2];n++;break;
// case 1:P2=0xBF;P0=LedBuff[3];n++;break;
// case 2:P2=0xDF;P0=LedBuff[2];n++;break;
// case 3:P2=0xEF;P0=LedBuff[3];n++;break;
// case 4:P2=0xF7;P0=LedBuff[0];n++;break;
// case 5:P2=0xFB;P0=LedBuff[1];n++;break;
// case 6:P2=0xFD;P0=LedBuff[0];n++;break;
// case 7:P2=0xFE;P0=LedBuff[1];n=0;break;
case 0:P2=0x80;P0=LedBuff[2];n++;break;
case 1:P2=0x40;P0=LedBuff[3];n++;break;
case 2:P2=0x20;P0=LedBuff[2];n++;break;
case 3:P2=0x10;P0=LedBuff[3];n++;break;
case 4:P2=0x08;P0=LedBuff[0];n++;break;
case 5:P2=0x04;P0=LedBuff[1];n++;break;
case 6:P2=0x02;P0=LedBuff[0];n++;break;
case 7:P2=0x01;P0=LedBuff[1];n=0;break;
}