單片機,跑馬燈,交替閃爍,C語言代碼

void delay(unsigned int a)

{

unsigned int i,j;

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

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

}

main()

{

unsigned char i,led;

led=0xfe;

while(1)

{

P0=led;

delay(500);

P0=0xff;

delay(500);

led=(led<<1)|0x01;

if(led==0xff)led=0xfe;

}

}