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>
typedef unsigned char BYTE;

sbit KEY=P3^7;
sbit HB =P3^2;
sbit LB =P3^3;
bit FLAG;

BYTE code TABLE1[]={0x00,0x06,0x5B,0x4F,0x66,0x6D,0x00};	 
BYTE code TABLE2[]={0x00,0x76,0x79,0x38,0x38,0x3F,0x00};

void DELAY()
{
	BYTE i=5;
	
	do
	{
		BYTE j=250;
		do
		{}while(--j);
	}while(--i);
}


main()
{
	BYTE High;		//数码管高位显示码偏移地址
	BYTE Low;		//数码管低位显示码偏移地址
	BYTE Num;
	BYTE code *Point;

START:	while(1)
		{
			if(KEY)
			{
				Point=TABLE2;
				FLAG=1;
			}
			else
			{
				Point=TABLE1;
				FLAG=0;
			}
	
			High=0x00;
			Low =0x01;
	
			Num=100;

			do
			{
				do
				{
					LB=1;
					HB=0;
					P2=*(Point+High);
					DELAY();
					
					HB=1;
					LB=0;
					P2=*(Point+Low);
					DELAY();	
				}while(--Num);
		
				if(FLAG)
				{
					if(!KEY)	goto START;
				}
				else
				{
					if(KEY)		goto START;	
				}
		
				High++;
				Low++;
			}while(High!=0x06);
		}	
}