clock.c

一个基于C51开发的计价秤

/*********************************************/
// File Name: clock.c
// Author: henny
// Date: 2006/3/1
/*********************************************/
#include <SST89x5xxRD2.h>
#include "Public.h"
#define HALF_SEC 10

static BYTE const days_month[13]={0,31,28,31,30,31,30,31,31,30,31,30,31}; 
extern BOOL half_sec,One_sec,colon;
extern TIME time;
extern DATE date;
extern BYTE lcd2_buf[7];
extern BYTE lcd3_buf[7];
extern BYTE state;

extern VOID Alarm();

BOOL leap_year()
{
	if(date.year%4==0)
		return TRUE;
	else
		return FALSE;
}

BOOL Clock_Set_Save()
{
	BYTE lyear,lmonth,lday;
	BYTE lhour,lmin,lsec;
	lyear=(lcd3_buf[5]-'0')*10+(lcd3_buf[4]-'0');
	lmonth=(lcd3_buf[3]-'0')*10+(lcd3_buf[2]-'0');
	lday=(lcd3_buf[1]-'0')*10+(lcd3_buf[0]-'0');
	lhour=(lcd2_buf[5]-'0')*10+(lcd2_buf[4]-'0');
	lmin=(lcd2_buf[3]-'0')*10+(lcd2_buf[2]-'0');
	lsec=(lcd2_buf[1]-'0')*10+(lcd2_buf[0]-'0');
	switch(state)
	{
	case EDIT_MONTH:
		if(lmonth<1||lmonth>12)
		{
			Alarm();
			return FALSE;
		}
		if(lmonth==2&&leap_year())
		{
			if(lday<1||lday>29)
				lday=29;
		}	
		else if(!leap_year()&&(lday<1||lday>days_month[lmonth]))
			lday=days_month[lmonth];		
		break;
	case EDIT_DAY:
		if(lmonth==2&&leap_year())
		{
			if(lday<1||lday>29)
			{
				Alarm();
				return FALSE;
			}
		}
		else if(!leap_year()&&(lday<1||lday>days_month[lmonth]))
		{
			Alarm();
			return FALSE;	
		}
		break;
	case EDIT_HOUR:
		if(lhour>23)
		{
			Alarm();
			return FALSE;	
		}
		break;
	case EDIT_MINUTE:
		if(lmin>59)
		{
			Alarm();
			return FALSE;	
		}
		break;
	case EDIT_SECOND:
		if(lsec>59)
		{
			Alarm();
			return FALSE;	
		}
		break;
	}
	TR0=0;
	date.year=lyear;
	date.month=lmonth;
	date.day=lday;
	time.hour=lhour;
	time.min=lmin;
	time.sec=lsec;
	TH0=V_TH0,TL0=V_TL0;
	TR0=1;
	return TRUE;		
}

VOID timer0()interrupt 1 using 1
{
	static BYTE data click=0;
	EA=0;
	TL0=V_TL0;
	TH0=V_TH0;
	++click;
	if(click>=HALF_SEC)
	{
		click=0;
		half_sec=TRUE;
		colon=~colon;
		if(colon)
		{
			One_sec=TRUE;
			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;
}