[51] RTC DS1307 Interfacing with 8051 problem

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MANO.5

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hai friends,
I am new to embedded field. I have working circuit with 8051-micro and ds1307 rtc with time set function.But it was not working properly.when starting rtc it give correct time.Then rtc time will decreases than actual time.crystal for microcontroller -12Mhz and for-DS1307 is 32.768khz.Circuit Diagram is


please help anybody.as soon as possible

my code is

Code C - [expand]
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#include<reg51.h>
#include<ds1307.h>
#include<string.h>
sbit rs=P1^0;
sbit rw=P1^1;
sbit en=P1^2;
sbit  sda_rtc =P1^3;
sbit  scl_rtc =P1^4;
 
sfr ldata=0xA0;    //p2
sfr KEYPRT=0xB0;  // Port for keypad        
 
    
sbit ROW0 = P3^4;
sbit ROW1 = P3^5;
sbit ROW2 = P3^6;
sbit ROW3 = P3^7;
sbit COL0 = P3^0;
sbit COL1 = P3^1;
sbit COL2 = P3^2;
sbit COL3 = P3^3; 
 
 
DS1307_get(unsigned char);
unsigned char KEYGET(void);
void lcdcommnd(unsigned char value);
void lcddata(unsigned char value);
void lcd_putc(unsigned char ascii);
void MSDelay(int ms);
void LcdLine1(unsigned char *value);
void LcdLine2(unsigned char *value);
 send2lcd(unsigned char value);
 
unsigned int Rtc_add_wr,Rtc_add_rd;
unsigned char d_rtc,datain_rtc,in_rtc,temp_rtc,dat_rtc,flag_rtc;
void MSDelay(int ms)
{
unsigned int i,j;
for(i=0;i<ms;i++)
{
for(j=0;j<1275;j++);
}
}
void lcdcommnd(unsigned char value)
{
    ldata= value;
    rs= 0;
    rw=0;
    en=1;
    MSDelay(1);
    en=0;
    return;
 
} 
void lcddata(unsigned char value)
{
 
    ldata = value;
    rs= 1;
    rw=0;
    en=1;
    MSDelay(1);
    en=0;
    return;
 
 
}
void lcd_string(unsigned char *value)   // Function to send string to LCD
{
     int x;
    for(x=0;value[x]!=0;x++)
    {
        lcddata(value[x]);
    }
 
}
void lcd_init()
{
        lcdcommnd(0x38);
    MSDelay(100);       
    lcdcommnd(0x0e);
    MSDelay(100);      
    lcdcommnd(0x01);
    MSDelay(100);
 
}
void lcd_decimal2(unsigned char val)
{
    unsigned char d,d1,d2;
 d=val%100;
d1=d/10;
d2=d%10;
 lcddata(d1+48);
lcddata(d2+48);
}
 
send2lcd(unsigned char value)
{
     unsigned char buf1,buf2,buf = 0;
 
  buf1 = value & 0xF0; /* Filter for high byte */
  buf1 = (buf1>>4); /* Convert  to ascii code */
   buf2 = value & 0x0F; /* Filter for low byte */
   buf=(buf1*10)+buf2;
   return buf;
} 
 
   unsigned char KEYGET() 
{
unsigned char colloc, rowloc, keyvalue;
unsigned char keypad[4] [4] = {'0', '1', '2','3',
'4', '5', '6', '7',
'8', '9', 'A', 'B',
'C', 'D', 'E', 'F'};
do
{ 
ROW0 = 0;
ROW1 = 0;
ROW2 = 0;
ROW3 = 0; // ground all rows
colloc = KEYPRT; // read port0
colloc &= 0x0F; //mask used bits 
} while ( colloc != 0X0F); // check until all keys released
 
do
{ do
{
MSDelay(5);
colloc = KEYPRT; // read port0
colloc &= 0x0F; //mask used bits
} while ( colloc == 0X0F); //keep checking for keypress
 
MSDelay(5); //delay for debounce
colloc = KEYPRT; // read port0
colloc &= 0x0F; //mask used bits
} while ( colloc == 0X0F); //keep checking for keypress
 
while (1)
 
{
ROW0 = 0; // ground row0
ROW1 = 1;
ROW2 = 1;
ROW3 = 1;
colloc = KEYPRT; // read port0
colloc &= 0x0F; //mask used bits
if( colloc!=0x0F)
{
rowloc = 0;
break; 
}
 
ROW0 = 1; // ground row1
ROW1 = 0;
ROW2 = 1;
ROW3 = 1;
colloc = KEYPRT; // read port0
colloc &= 0x0F; //mask used bits
if( colloc!=0x0F)
{
rowloc = 1;
break; 
}
 
ROW0 = 1; // ground row2
ROW1 = 1;
ROW2 = 0;
ROW3 = 1;
colloc = KEYPRT; // read port0
colloc &= 0x0F; //mask used bits
if( colloc!=0x0F)
{
rowloc = 2;
break; 
}
ROW0 = 1; // ground row3
ROW1 = 1;
ROW2 = 1;
ROW3 = 0;
colloc = KEYPRT; // read port0
colloc &= 0x0F; //mask used bits
rowloc = 3;
break; 
}
 
if( colloc ==0x0E)
keyvalue = keypad [rowloc] [0];
else if ( colloc ==0x0D)
keyvalue = keypad [rowloc] [1];
else if ( colloc ==0x0B)
keyvalue = keypad [rowloc] [2];
else
keyvalue = keypad [rowloc] [3];
return (keyvalue);
}
 
void Rtc_Start()// must for any operation on EEPROM
{
sda_rtc=1;
scl_rtc=1;
sda_rtc=0;
scl_rtc=0;
}
void Rtc_Stop()// this is similar to the START operation whereas this should be performed after the completion of any operation
{
sda_rtc=0;
scl_rtc=1;
sda_rtc=1;
}
void Rtc_Ack()// this is to intimate the EEPROM that the read operation is over
{
sda_rtc=1;
scl_rtc=1;
scl_rtc=0;
}
 
void Rtc_Rx()// program read the data from the EEPROM
{
unsigned char l_rtc;
sda_rtc=1;
for (l_rtc=0;l_rtc<=7;l_rtc++)
{
scl_rtc=1;
in_rtc=in_rtc<<1;
in_rtc|=sda_rtc;
scl_rtc=0;
}
datain_rtc=in_rtc;
in_rtc=0;
}
void Rtc_Tx()// program to send the device address, read/write address,data to be written
{
signed char i_rtc;
for(i_rtc=7;i_rtc>=0;i_rtc--)// should necessarily be initialised as signed char.
{
CY=(d_rtc>>i_rtc)&0x01;
sda_rtc=CY;
scl_rtc=1;// clock is essential inorder to write or read
scl_rtc=0;// clk should be alternated
}
sda_rtc=1;
scl_rtc=1;
CY=sda_rtc;
scl_rtc=0;
}
void Rtc_rd_wr_sub()// this routine will be used by both the read & write operations to send the device address & the address at which the corresponding action is to be taken
{
Rtc_Start();
here1:
d_rtc=Rtc_add_wr;// device address is passed
Rtc_Tx();
if(CY==1)goto here1;
again1:
d_rtc=dat_rtc;// the address from which data is to be read/written is to be passed
Rtc_Tx();
if(CY==1)goto again1;
}
 Rtc_Read(unsigned char zig)// program to read from EEPROM
{
dat_rtc=zig;
Rtc_rd_wr_sub();
Rtc_Start();
be:
d_rtc=Rtc_add_rd;
Rtc_Tx();
if(CY==1)goto be;
Rtc_Rx();
Rtc_Ack();
CY=0;
Rtc_Stop();
return(datain_rtc);
}
 DS1307_get(unsigned char addr)
{
unsigned char ret;
 
Rtc_Start();            
ret = Rtc_Read(addr);
Rtc_Stop();
 return ret;
}
void Rtc_Init()//lower order 256 bytes of the chip
{
   Rtc_add_wr=0xd0;
   Rtc_add_rd=0xd1;
}
void Rtc_Write(unsigned char zig,unsigned char zag)// program to write to EEPROM
{
dat_rtc=zig;
temp_rtc=zag;
Rtc_rd_wr_sub();
above:
d_rtc=temp_rtc;
Rtc_Tx();
if (CY==1)goto above;
CY=0;
Rtc_Stop();
}
void DS1307_settime(unsigned char hh, unsigned char mm, unsigned char ss)
{
Rtc_Start(); 
 
Rtc_Write(0x00,ss); /* Write sec on RAM address 00H */
Rtc_Write(0x01,mm); /* Write min on RAM address 01H */
Rtc_Write(0x02,hh); /* Write hour on RAM address 02H */
Rtc_Stop();           /* Stop i2c bus */
}
void DS1307_setdate(unsigned char dd, unsigned char mm, unsigned char yy)
{
  Rtc_Start();
Rtc_Write(0x04,dd); /* Write date on RAM address 04H */
Rtc_Write(0x05,mm); /* Write month on RAM address 05H */
Rtc_Write(0x06,yy); /* Write year on RAM address 06H */
Rtc_Stop(); /* Stop i2c bus */
}
void main()
{
unsigned int y,tens,ones;
unsigned char sec, min, hour, date, month, year;
//unsigned char a,b,c,d,e,hr1,hr2,sec1,sec2,min1,min2,dt1,dt2,mon1,mon2;
lcd_init();
MSDelay(200);
Rtc_Init();
lcdcommnd(0x80);
lcd_string("1->SET DATE&TIME"); 
lcdcommnd(0xC0);
lcd_string ("Any other-> SKIP");
COL0 = 1; // make cols input port
COL1 = 1;
COL2 = 1;
 
y = KEYGET();
lcdcommnd(0x01); // Clear Command
MSDelay(20);
lcddata(y);
MSDelay(20);
if (y == '1')
{
        lcdcommnd(0x01);       
lcdcommnd(0x80);
lcd_string("HR:MN:SC");
////////////////hour/////////////////////
y = KEYGET();
tens = y & 0x0F;
tens = (tens << 4) & 0xF0;
lcdcommnd(0XC0);
lcddata(y);
y = KEYGET();
ones = y & 0x0F;
lcdcommnd(0XC1);
lcddata(y);
hour = (tens |ones );
lcdcommnd(0XC2);
lcddata(':');
////////////////min/////////////////////
y = KEYGET();
tens = y & 0x0F;
tens = (tens << 4) & 0xF0;
lcdcommnd(0XC3);
lcddata(y);
y = KEYGET();
ones = y & 0x0F;
lcdcommnd(0XC4);
lcddata(y);
min = (tens |ones );
lcdcommnd(0XC5);
lcddata(':');
////////////////sec/////////////////////
y = KEYGET();
tens = y & 0x0F;
tens = (tens << 4) & 0xF0;
lcdcommnd(0XC6);
lcddata(y); 
y = KEYGET();
ones = y & 0x0F;
lcdcommnd(0XC7);
lcddata(y);
sec = (tens |ones );
///////////////////////////////////////
MSDelay(20);
////////////////////////////////////////////
lcdcommnd(0x01); // Clear Command
MSDelay(20);
lcdcommnd(0x80);
lcd_string("DD:MM:YY");
////////////////date/////////////////////
y = KEYGET();
tens = y & 0x0F;
tens = (tens << 4) & 0xF0;
lcdcommnd(0XC0);
lcddata(y);
y = KEYGET();
ones = y & 0x0F;
lcdcommnd(0XC1);
lcddata(y);
date = (tens |ones );
lcdcommnd(0XC2);
lcddata(':');
//////////////////month/////////////////
y = KEYGET();
tens = y & 0x0F;
tens = (tens << 4) & 0xF0;
lcdcommnd(0XC3);
lcddata(y);
y = KEYGET();
ones = y & 0x0F;
lcdcommnd(0XC4);
lcddata(y);
month = (tens |ones );
lcdcommnd(0XC5);
lcddata(':');
///////////////////////////////////////
//////////////////year/////////////////
y = KEYGET();
tens = y & 0x0F;
tens = (tens << 4) & 0xF0;
lcdcommnd(0XC6);
lcddata(y);
y = KEYGET();
ones = y & 0x0F;
lcdcommnd(0XC7);
lcddata(y);
year = (tens |ones );
///////////////////////////////////////
/////////////////////////////////////////
 
DS1307_settime(hour,min,sec); /* Set Time (hh:mm:ss) */       
DS1307_setdate(date,month,year); /* Set Date (dd/mm/yy) */
MSDelay(200);
lcdcommnd(0x01); // Clear Command       
lcdcommnd(0x80);
lcd_string("Date:"); 
lcdcommnd(0xC0);
 lcd_string("Time:"); 
 sec = DS1307_get(0x00); 
min = DS1307_get(0x01); 
hour = DS1307_get(0x02);
date = DS1307_get(0x04);
month = DS1307_get(0x05);
year = DS1307_get(0x06);
sec=send2lcd(sec);
min=send2lcd(min);
hour=send2lcd(hour);
date=send2lcd(date);
month=send2lcd(month);
year=send2lcd(year);
 lcdcommnd(0x80);
lcd_string("Date:"); 
lcdcommnd(0xC0);
 lcd_string("Time:"); 
lcdcommnd(0x85); 
lcd_decimal2(date);
 lcdcommnd(0x87);
lcddata('/');
lcdcommnd(0x88); 
lcd_decimal2(month);
lcdcommnd(0x8A);
lcddata('/');
lcdcommnd(0x8B); 
lcd_decimal2(year); 
lcdcommnd(0xC5); 
lcd_decimal2(hour);
 lcdcommnd(0xC7);
lcddata('.');
lcdcommnd(0xC8);
lcd_decimal2(min); 
lcdcommnd(0xCA);
lcddata('.');
lcdcommnd(0xCB);
lcd_decimal2(sec);
MSDelay(100);
 
}
 
while(1) 
{
lcdcommnd(0x01);
 
/////////////////////////////rtc///////////////////////////////
  Rtc_Init();
sec = DS1307_get(0x00); 
min = DS1307_get(0x01); 
hour = DS1307_get(0x02);
date = DS1307_get(0x04);
month = DS1307_get(0x05);
year = DS1307_get(0x06);
sec=send2lcd(sec);
min=send2lcd(min);
hour=send2lcd(hour);
date=send2lcd(date);
month=send2lcd(month);
year=send2lcd(year);
 lcdcommnd(0x80);
lcd_string("Date:"); 
lcdcommnd(0xC0);
 lcd_string("Time:"); 
lcdcommnd(0x85); 
lcd_decimal2(date);
lcdcommnd(0x87);
lcddata('/');
lcdcommnd(0x88); 
lcd_decimal2(month);
 lcdcommnd(0x8A);
lcddata('/');
lcdcommnd(0x8B); 
lcd_decimal2(year); 
lcdcommnd(0xC5); 
lcd_decimal2(hour);
 lcdcommnd(0xC7);
lcddata('.');
lcdcommnd(0xC8);
lcd_decimal2(min); 
lcdcommnd(0xCA);
lcddata('.');
lcdcommnd(0xCB);
lcd_decimal2(sec);
MSDelay(100);
}
}
 
Last edited by a moderator:

Place 
Code C - [expand]
1

Rtc_Init();
in main() function before 
Code C - [expand]
1

while(1)
loop. RTC should be initialized only once. Have you compiled the code and tested the hex file. Does it really work or are you trying the hex file that came with the project without compiling?
 


hai jayanth,
Thank you for your reply.After making changes also it didn't work.I just simulate the circuit and program in proteus6.9.The clock was updated very slow means updated for 4or 5 seconds delay.So is there any problem with crystal oscillator or delay??.....
 

jayanth.devarayanadurga said:
Which key has to be pressed to run the time. Here the current time is shown but time doesn't run.
Click to expand...

if key 2(means 1) is pressed then time set mode is displaying.anything other than 1 will display current time.
it was looking like clock seconds register was updated after 1.33 seconds or more when starting and even more after some time
 

I ran the simulation for 15 minutes and saw only 1 sec difference between LCD time and Proteus DS1307 time throughout the simulation duration. Remove MSDelay(100) which is the last line of while(1) loop. Try after that. Post the new compiled hex file.



Edit: Use timer interrupt to update LCD data.
 
Last edited:

Hello sir,
i start the simulation at 1.40pm(13.40) today after 30 minutes it show 1.57 pm(23.57) instead of 2.10(14.10). I already tried with 10 ms delay even without delay also.nothing changed.is anything problem with proteus version. I was using proteus 6.9...
 

hello sir,
i tried in proteus 7.6 also .same result.when compiling this code it will give warning
c(2): warning C318: can't open file 'ds1307.h'

is this a problem??how to solve it
 

MANO.5 said:
when compiling this code it will give warning
c(2): warning C318: can't open file 'ds1307.h'

is this a problem??how to solve it
Click to expand...

Yes, it is a problem.

If the ds1307.h header file is located with the other C source files of your project, you may have to change the <> to "" as such:

Code: 
#include<reg51.h>
#include"ds1307.h"
#include<string.h>
sbit rs=P1^0;
sbit rw=P1^1;
sbit en=P1^2;
sbit  sda_rtc =P1^3;
sbit  scl_rtc =P1^4;
...
...

Typically, the quotes in the #include directive indicate to the compilers preprocessor to begin searching for the header file in the current project directory, rather than the default include directory of the compiler installation or other specified header file locations.

What compiler are you using? KEIL C51?

KEIL Documentation - #include

BigDog
 


Upload your COMPLETE project, not just the Proteus project (DSN) file and the HEX file, include ALL C source (main.c), ds1307.h and other source files (ds1307.c) required.

What compiler and version are you utilizing to compile the project?


BigDog
 

hello sir ,
I posted the program in my first post of this thread. I am using trial version of keil IDE v4 with limitation of program size within 8 kb..

keil IDE-Version:
µVision V4.24.00.0
C Compiler: C51.Exe V9.06
Assembler: A51.Exe V8.02a
Linker/Locator: BL51.Exe V6.22
Librarian: LIB51.Exe V4.29
Hex Converter: OH51.Exe V2.6
CPU DLL: S8051.DLL V3.79.0.1
Dialog DLL: DP51.DLL V2.62.0.1
 

You have only posted the main C source file in your original post.

Please post ds1307.h header file and ds1397.c if it exists.

BigDog
 

don't have any other files.i think all the rtc functions are in that program....
 

Then you need to remove the following preprocessor statement:

Code: 
#include<ds1307.h>

You cannot include a header file which does not exist.

BigDog
 

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