用汇编语言编写程序 使单片机实验箱上的八只发光二极管左循环点亮2次，再右循环2次，这样交替出现5次

#include
#include
#define uchar unsigned char
void delay(uchar a)
{
uchar i;
while(a--)for(i=0;i<120;i++);
}
main()
{
uchar i,j,k;
P0=0xfe;
while(1)
    {
    for(i=0;i<5;i++)
        {
        for(j=0;j<2;j++)
            {
            for(k=0;k<8;k++)
                {
                P0=_crol_(P0,1);
                delay(250);
                }
            }
        for(j=0;j<2;j++)
            {
            for(k=0;k<8;k++)
                {
                P0=_cror_(P0,1);
                delay(250);
                }
            }            
        }
    }
}