clock.bak

来自「一个基于C51开发的计价秤」· BAK 代码 · 共 66 行

#include <SST89x5xxRD2.h>
#include "Public.h"

#define SECOND 20

static code BYTE days_month[13]={0,31,28,31,30,31,30,31,31,30,31,30,31}; 

TIME time;
DATE date;

BOOL leap_year()
//check year is leap year?
//return TRUE is leap year
{
	if((date.year%4==0)&&(date.year%100!=0))
		return TRUE;
	else if(date.year%400==0)
		return	TRUE;
	else
		return FALSE;
}


VOID timer0()interrupt 1 using 1
//50ms interrupt
{
	static BYTE click=0;
	EA=0;
	TH0=V_TH0;
	TL0=V_TL0;
	++click;
	if(click>=SECOND)
	{
		click=0;
		if(++time.sec>=60)
		{
			time.sec=0;
			if(++time.min>=60)
			{
				time.min=0;
				if(++time.hour>=24)
				{
					time.hour=0;
					if(++date.day>days_month[date.month])
					{
						if(date.month==2&&leap_year())
						{
							if(date.day>29)
								date.day=1;
						}
						else
							date.day=1;
						if(++date.month>12)
						{
							date.month=1;
							if(++date.year>=99)
								date.year=0;
						}
					}
				}
			}
		}					
	}
	EA=1;
}