giúp em về đồng hồ thời gian thực ds1307

[loveboom3012]

#include <16f877a.h>
#include <def_877a.h>
#include <ds1307.c>
#fuses nowdt,noprotect,nolvp,xt,hs
#use delay(clock=4000000)
#use fast_io(b)
#use fast_io(d)
byte sec,min,hour;
byte const maled[10] = {0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90 };
byte gic,gid,pc,pd,gc,gd;
byte chinh_giay;
int i;
int16 j;
#bit hourc =0x08.5
#bit hourd =0x08.4
#bit minc =0x08.3
#bit mind =0x08.2
#bit secc =0x08.1
#bit secd =0x08.0
#bit sw1=0x07.0
#bit sw2=0x07.1
#bit sw3=0x07.5
#bit sw4=0x07.6
void hienthi();
void read_time();
void update_time();
void update_ds1307();
void set_sec();
void set_min();
void set_hour();
void main()
{
	
	set_tris_d(0x00);
	set_tris_b(0x00);
	init_ds1307();
	chinh_giay=0;
	while(1)
	{
		j++;
		read_time();
		hienthi();	
	if(sw1==0)
        {
            if(chinh_giay==0&&sw4==1)
            {
                while(sw1==0) {}
                set_sec(); chinh_giay=1;
            }
 	if(sw4==0)
        {
            chinh_giay=0;
        }
	}
}
}
void read_time()
{
	sec=read_ds1307(0);
	min=read_ds1307(1);
	hour=read_ds1307(2);
	update_time();
}
void update_ds1307()
{
	write_ds1307(0,sec);
	write_ds1307(1,min);
	write_ds1307(2,hour);
}
void update_time()
{

	gd=sec&0x0f;
	gc=(sec&0xf0)>>4;
	pd=min&0x0f;
	pc=(min&0xf0)>>4;
	gid=hour&0x0f;
	gic=(hour&0x30)>>4;

}

void set_sec()
{
	gd=1;gc=1;pd=1;pc=1;gid=1;gic=1;
	sec=read_ds1307(0);
	gd=sec&0x0f;
	gc=(sec&0xf0)>>4;
	while(sw1==1 && sw4==1)
	{
	portb=maled[gd];gd=0;delay_us(100);gd=1;
	portb=maled[gc];gc=0;delay_us(100);gc=1;
		if(sw2==0)
			{
				while(sw2==0){}
				if(gc==5 && gd==10)
					{gc=0;gd=0;}
				else if(gd==10)
					{gc++;gd=0;}
				else
					gd++;
			}
		if(sw3==0)
			{
				while(sw3==0){}
				if(gc==0&&gd==0)
				{gc=5;gd=9;}
				else if(gd==0)
				{gc--;gd=9;}
				else
				gd--;
			}
		sec=(gc<<4)+gd;
		write_ds1307(0,sec);
		delay_us(10);	
}
}

void hienthi()
{
	for(i=1;i<30;i++)
	{
		portb=maled[gd];secd=0;delay_us(100);secd=1;
		portb=maled[gc];secc=0;delay_us(100);secc=1;
		portb=maled[pd];mind=0;delay_us(100);mind=1;
		portb=maled[pc];minc=0;delay_us(100);minc=1;
		portb=maled[gid];hourd=0;delay_us(100);hourd=1;
		portb=maled[gic];hourc=0;delay_us(100);hourc=1;
	}
}

mấy anh xem em viết cái hàm chỉnh giây như vậy có sai ở đâu không ? mô phỏng với protues không chạy đuợc phần chỉnh giây