#include"reg52.h"
#define uchar unsigned char
#define uint unsigned int
#define out P2
sbit pos=P0^0;
sbit neg=P0^1;
void delayms(unit);
uchar code turn[]={0x02,0x06,0x04,0x0c,0x08,0x09,0x01,0x03};
void main(void)
{
uchar i;
out=0x03;
while(1)
{
if(!pos)
{
i=i<8 ? i+1 : 0;
out=turn[i];
delayms(50);
}
else if(!neg)
{
i=i>0 ? i-1 : 7;
out=turn[i];
delayms(50);
}
}
}
void delayms(unit i,j)
{
uchar i,j;
for(;j>0;j--)
{
i=250;
while(--i);
i=249;
while(--i);
}
}
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