STC15F104E 呼吸灯

串口转TTL 与 STC15F104E单片机 的 连接，
VCC    TXD    RXD    GND    ~     VCC   P3.0   P3.1   GND .

#include <REG2051.H>
sbit LED=P3^4;
void delay (unsigned char h)
{
int i;
while(h--)for(i=0;i<148;i++);
}

void main(void)
{
int Brightness=0,f=1;
while(1)
{
int i,j,k;
for(j=0;j<10;j++)for(i=0;i<256;i++)//LED=(i>Brightness);What is this?
{								   //What is this?
if(i<Brightness)LED=0;		   //OMG!!
else LED=1;
}
Brightness+=f;
if(Brightness==255|Brightness==0)f=-f;	  //R U Kidding Me?
}
}