Regards,
Filip

http://ucdesignplay.blogspot.com/2011/12/ds1307-rtc-with-hd44780-lcd.html

filip

#include
#include

#include “I2C.h”
#include “lcd.h”
#include “ds1307.h”

void ShowMainMenu();
void SetTime();

void Wait()
{
uint8_t i;
for(i=0;i<20;i++)
_delay_loop_2(0);
}

uint8_t PREV_PINB=0xFF;
/*

Function to test the current status of keys(0 to 2)

returns
0 if NOT pressed
1 if Pressed

*/
uint8_t GetKeyStatus(uint8_t key)
{
return (!(PINB & (1<<key)));
}

/*

Function to test the previous status of keys(0 to 2)

returns
0 if NOT pressed
1 if Pressed

*/
uint8_t GetPrevKeyStatus(uint8_t key)
{
return (!(PREV_PINB & (1<<key)));
}
void main()
{
//Wait Util Other device startup
_delay_loop_2(0);
_delay_loop_2(0);

//Initialize the LCD Module
LCDInit(LS_BLINK);

//Initialize I2C Bus
I2CInit();

//Enable Pull ups on keys
PORTB|=((1<<PB2)|(1<<PB1)|(1<<PB0));

//Clear CH bit of RTC
#define CH 7

uint8_t temp;
DS1307Read(0×00,&temp);

//Clear CH Bit – Clock Halt bit=0
temp&=(~(1<>4);
Time[5]=’:';

DS1307Read(0×01,&data);//minute

Time[4]=48+(data & 0b00001111);
Time[3]=48+((data & 0b01110000)>>4);
Time[2]=’:';

DS1307Read(0×02,&data);//sati

Time[1]=48+(data & 0b00001111);
Time[0]=48+((data & 0b00110000)>>4);

LCDWriteStringXY(0,0,Time);

DS1307Read(0×06,&data); //godina
Date[8]=”;
Date[7]=48+(data & 0b00001111);
Date[6]=48+((data & 0b11110000)>>4);
Date[5]=’/';

DS1307Read(0×05,&data); //mjesec

Date[4]=48+(data & 0b00001111);
Date[3]=48+((data & 0b00010000)>>4);
Date[2]=’/';

DS1307Read(0×04,&data); //dan u mjesecu

Date[1]=48+(data & 0b00001111);
Date[0]=48+((data & 0b00110000)>>4);

LCDWriteStringXY(0,1,Date);

DS1307Read(0×03,&data); //dan u tjednu

Dan=data & 0b00000111;

switch (Dan)
{
case 1 : LCDWriteStringXY(9,1,”Pon”); break;
case 2 : LCDWriteStringXY(9,1,”Uto”); break;
case 3 : LCDWriteStringXY(9,1,”Sri”); break;
case 4 : LCDWriteStringXY(9,1,”Cet”); break;
case 5 : LCDWriteStringXY(9,1,”Pet”); break;
case 6 : LCDWriteStringXY(9,1,”Sub”); break;
case 7 : LCDWriteStringXY(9,1,”Ned”); break;
}

/*//AM/PM
if(data & 0b00100000)
{
LCDWriteStringXY(0,1,”Poslije podne”);
}
else
{
LCDWriteStringXY(0,1,”Prije podne “);
}
*/
//Wait Some time and keep testing key input
uint8_t i;
for(i=0;i<20;i++)
{

if(GetKeyStatus(2))
{
//Go To Main Menu
ShowMainMenu();

_delay_loop_2(0);
_delay_loop_2(0);
_delay_loop_2(0);

}
_delay_loop_2(5000);
}
}

}

void ShowMainMenu()
{
//The Main Menu
char *menu_items[]={ "Set Time",
"Set Date",
"Quit"
};
uint8_t menu_count=3;
uint8_t selected=0;

_delay_loop_2(0);
_delay_loop_2(0);

while(1)
{
LCDClear();
LCDWriteString(" Main Menu ");

LCDWriteStringXY(2,1,menu_items[selected]);

LCDWriteStringXY(0,1,"”);

if(GetKeyStatus(1))
{
//Left Key(No 1) is pressed
//Check that it was not pressed previously
if(!GetPrevKeyStatus(1))
{
if(selected !=0)
selected–;
}
}

if(GetKeyStatus(0))
{
//Right Key(No 0) is pressed
//Check that it was not pressed previously
if(!GetPrevKeyStatus(0))
{
if(selected !=(menu_count-1))
selected++;
}
}

if(GetKeyStatus(2))
{
//Enter Key Pressed
//Check that it was not pressed previously
if(!GetPrevKeyStatus(2))
{
//Call Appropriate Function
switch (selected)
{
case 0:
SetTime();
break;
case 1:
SetDate();
break;

case 2:
return;//Quit

//case 3:
// return;//Quit
}

}
}

PREV_PINB=PINB;

_delay_loop_2(5000);
}
}

void SetTime()
{

uint8_t hr,min,sec,temp;

//Read the Second Register
DS1307Read(0×00,&temp);
sec=(((temp & 0b01110000)>>4)*10)+(temp & 0b00001111);

//Read the Minute Register
DS1307Read(0×01,&temp);
min=(((temp & 0b01110000)>>4)*10)+(temp & 0b00001111);

//Read the Hour Register
DS1307Read(0×02,&temp);
hr=(((temp & 0b00110000)>>4)*10)+(temp & 0b00001111);

uint8_t sel=0;

while(1)
{
LCDClear();

LCDWriteString(“00:00:00 “);

LCDWriteIntXY(0,0,hr,2);
LCDWriteIntXY(3,0,min,2);
LCDWriteIntXY(6,0,sec,2);

//Draw Pointer
LCDWriteStringXY(sel*3,1,”^^”);

//Input Up key
if(GetKeyStatus(1))
{
if(!GetPrevKeyStatus(1))
{
if(sel==0)
{
//Hour
if(hr==24)
{
hr=0;
}
else
{
hr++;
}
}

if(sel==1)
{
//Min
if(min==59)
{
min=0;
}
else
{
min++;
}
}

if(sel==2)
{
//Sec
if(sec==59)
{
sec=0;
}
else
{
sec++;
}
}

if(sel == 4)
{
//OK
break;
}
}
}

//Input Down
if(GetKeyStatus(0))
{
if(!GetPrevKeyStatus(0))
{
if(sel==0)
{
//Hour
if(hr==0)
{
hr=23;
}
else
{
hr–;
}
}

if(sel==1)
{
//Min
if(min==0)
{
min=59;
}
else
{
min–;
}
}

if(sel==2)
{
//Sec
if(sec==0)
{
sec=59;
}
else
{
sec–;
}
}

if(sel == 4)
{
//OK
break;
}
}
}

if(GetKeyStatus(2))
{
if(!GetPrevKeyStatus(2))
{
//Change Selection
if(sel==4)
sel=0;
else
sel++;
}
}

PREV_PINB=PINB;

_delay_loop_2(30000);

}

//Now write time back to RTC Module
temp=((sec/10)<<4)|(sec%10);
DS1307Write(0×00,temp);

temp=((min/10)<<4)|(min%10);
DS1307Write(0×01,temp);

temp=((hr/10)<<4)|(hr%10);
temp&= ~(0b01000000); // 24 satno vrijeme

DS1307Write(0×02,temp);

LCDClear();
LCDWriteString("Time Set !");

uint8_t i;
for(i=0;i>4)*10)+(temp & 0b00001111);

//Read the Month Register
DS1307Read(0×05,&temp);
month=(((temp & 0b00010000)>>4)*10)+(temp & 0b00001111);

//Read the Year Register
DS1307Read(0×06,&temp);
yr=(((temp & 0b11110000)>>4)*10)+(temp & 0b00001111);

//Procitaj registar za Dan
DS1307Read(0×03,&temp);
dan=temp & 0b00000111;

uint8_t sel=0;

while(1)
{
LCDClear();

LCDWriteString(“00/00 0 00 “);

LCDWriteIntXY(0,0,date,2);
LCDWriteIntXY(3,0,month,2);
LCDWriteIntXY(6,0,dan,2);
LCDWriteIntXY(9,0,yr,2);

//Draw Pointer
LCDWriteStringXY(sel*3,1,”^^”);

//Input Up key
if(GetKeyStatus(1))
{
if(!GetPrevKeyStatus(1))
{
if(sel==0)
{
//Date
if(date==32)
{
date=1;
}
else
{
date++;
}
}

if(sel==1)
{
//Month
if(month==13)
{
month=1;
}
else
{
month++;
}
}

if(sel==2)
{
//Dan
if(dan==8)
{
dan=1;
}
else
{
dan++;
}
}

if(sel==3)
{
//Year
if(yr==99)
{
yr=1;
}
else
{
yr++;
}
}

if(sel == 4)
{
//OK
break;
}
}
}

//Input Down
if(GetKeyStatus(0))
{
if(!GetPrevKeyStatus(0))
{
if(sel==0)
{
//Date
if(date==0)
{
date=31;
}
else
{
date–;
}
}

if(sel==1)
{
//Month
if(month==0)
{
month=12;
}
else
{
month–;
}
}

if(sel==2)
{
//Dan
if(dan==0)
{
dan=7;
}
else
{
dan–;
}
}

if(sel==3)
{
//Year
if(yr==0)
{
yr=99;
}
else
{
yr–;
}
}

if(sel == 4)
{
//OK
break;
}
}
}

if(GetKeyStatus(2))
{
if(!GetPrevKeyStatus(2))
{
//Change Selection
if(sel==4)
sel=0;
else
sel++;
}
}

PREV_PINB=PINB;

_delay_loop_2(30000);

}

//Now write DATE back to RTC Module
temp=((date/10)<<4)|(date%10);
DS1307Write(0×04,temp);

temp=((month/10)<<4)|(month%10);
DS1307Write(0×05,temp);

temp=((yr/10)<<4)|(yr%10);
DS1307Write(0×06,temp);

temp=dan%10;
DS1307Write(0×03,temp);

LCDClear();
LCDWriteString("Date Set !");

uint8_t i;
for(i=0;i<10;i++)
_delay_loop_2(0);

}

I changed pm/am to 24 hout time and added 1Hz signal output of ds1307.

Regards
Filip

Thanks a lot!
Regards

I just test your circuite with some modification to run on atmega16.
At first i got in troble. finally by connecting SDA pin of DS1307 to SDA pin of Micro and also SCL pin of DS1307 to SCL pin of Micro my problem solved. In your shematic you connected them in reverse. I mean you connected SDA to SCL and SCL to SDA.
Regards
Ali Hassanpour

First I would like to say gratulations and thank you about your website and projects! They are very useful and great solutions!

I would like to ask you about this DS1307 project. Is it possible to save a given time point in DS1307? (Beside the current time, I would store an alarm time.)
If it is possible could you explain me how?

You mentioned that it is also can handle and following dates, calendars as well. How does it possible to store date and read it back?

Really really thank you your help!

Have a nice day and good projects.

Regards,

Gabor

Thanks for the fine observation. I have too noticed some problems like that but don’t know the real cause. Please, if you or someone finds some clues then please share it.

I assembled the clock and it works fine for both DS1307 and DS2131 chips. This second one is newer but it works with software aou provided. I compared precision with stopwatch and it was accurate exept when I turn off and on again. After few off-on’s RTC (both chips equally) were late cca 3 sec. So, it seems to me that something happends with rtc during on-off that causes delay. Did anyone notice this, is it normal, and can something be done about it?

Thanks, regards…

thank you

DS1307Read(0×02,&temp);
hr=(((temp & 0b00010000)>>4)*10)+(temp & 0b00001111);
|
reading only 4 bit ——-

With best wishes from Russia !

Code from my project:
int main( void )
{ _delay_loop_2(0);
_delay_loop_2(0);
IND_Init(); // ??????????
OWI_Init(BUS); //1-wire bus
//Initialize I2C Bus
I2CInit(); //i^2c

//Clear CH bit of RTC
#define CH 7
uint8_t hr,min,sec,am_pm,temp;

DS1307Read(0×00,&temp);
//Clear CH Bit
temp&=(~(1<<CH));
DS1307Write(0×00,temp);

//Set 12 Hour Mode
// DS1307Read(0×02,&temp);
//Set 12Hour BIT
// temp|=(0b01000000);
//Write Back to DS1307
// DS1307Write(0×02,temp);

hr=19;
min=59;
sec=50;
//am_pm=1;

//Now write time back to RTC Module
temp=((sec/10)<<4)|(sec%10);
DS1307Write(0×00,temp);

temp=((min/10)<<4)|(min%10);
DS1307Write(0×01,temp);

temp=((hr/10)<<4)|(hr%10);
DS1307Write(0×02,temp);
// if(am_pm)
// {
// temp|=0b00100000;
// temp|=0b00000000;
// }

// temp=0b01100001;
// DS1307Write(0×02,temp);

// uint8_t i;
// for(i=0;i<10;i++)
_delay_loop_2(0);
…
}