main.c

《Proteus在MCS-51&ARM7系统中的应用百例》逆向之 Chapter 4 《Proteus在MCS-51&ARM7系统中的应用百例》MCS-51例子的C语言版本。

#include <reg51.h>
#include <intrins.h>


unsigned char xdata PORTA  	_at_	0x7CFF;
unsigned char xdata PORTB	_at_	0x7DFF;
unsigned char xdata PORTC	_at_	0x7EFF;
unsigned char xdata CADDR	_at_	0x7FFF;

void DELAY()
{
	unsigned char i=0x00;
	unsigned char j=0x00;

	do
	{
		do
		{
		}while(--j);
	}while(--i);
}
 

main()
{
	unsigned char temp;
	unsigned char num;

	CADDR=0x80;

	while(1)
	{	
		temp=0xFE;
		num=8;

		do
		{
			PORTA=temp;
			DELAY();
			temp=_crol_(temp,1);	
		}while(--num);	
	}
		
}