myled.c

Six objects here: The document you re reading & its Chinese version Set of "HWDesign" includes

#include "myLED.h"
#include <reg51.h>

void LEDctl(int cmd,unsigned short arg)
{
	switch (cmd)
	{
		case LEDoff:	{P1|=arg;	break;}
		case LEDon :	{P1&=~arg;	break;}
		case LEDchange:	{P1=~P1;	break;}
		//case LEDchange:	{P1^=0xFF;	break;}	//This is another implement of LEDchange

		default:		{/*bad cmd selector*/}
	}
}