源代码：

#include <reg52.h>

void Delay1ms(unsigned int count)

{

unsigned int i,j;

for(i=0;i<count;i++)

for(j=0;j<120;j++);

}

void main(void)

{

unsigned char LEDIndex = 0;

bit LEDDirection = 1;

while(1)

{

if(LEDDirection)

P1 = ~(0x01<<LEDIndex);

else

P1 = ~(0x80>>LEDIndex);

if(LEDIndex==7)

LEDDirection = !LEDDirection;

LEDIndex = (LEDIndex+1)%8;

Delay1ms(100);

}

}