scanf总是漏收首个字符

qiu0305

int fgetc(FILE *f)
{   
 
#ifdef USE_USART1_AS_MONITOR
    USART_ClearFlag( USART1, USART_FLAG_RXNE );
    while( USART_GetFlagStatus( USART1, USART_FLAG_RXNE ) == RESET );
    //delay(1000);
   return （u16）USART_ReceiveData( USART1 );
#endif
}