/*Delay_ms:毫秒級延時函數(shù)------------------------------*    
*功  能:延時函數(shù)                                       *
*參  數(shù):i=延時時間(ms)     (i取值范圍:1-255)           *
*返  回:無                                             *
*-----------------------------------------------------*/                            
void Delay_ms(unsigned char i)
  {  unsigned char j;
     unsigned char u;
     for(j=0;j<i;j++)
         for(u=0;u<=250;u++) ;
  }