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  1. #1
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    RTC DS1307 Interfacing with 8051 problem

    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 isClick image for larger version. 

Name:	clock.jpg 
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    please help anybody.as soon as possible

    my code is

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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 bigdogguru; 17th October 2013 at 06:25. Reason: Added CODE or SYNTAX Tags

  2. #2
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    Re: RTC DS1307 Interfacing with 8051 problem

    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?



  3. #3
    Member level 1
    Points: 737, Level: 5

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    Re: RTC DS1307 Interfacing with 8051 problem

    Quote Originally Posted by jayanth.devarayanadurga View Post
    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??.....



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    Re: RTC DS1307 Interfacing with 8051 problem

    Zip and post the project files + Proteus file. I will test it. Connect a 3V Cell to DS1307.



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    Re: RTC DS1307 Interfacing with 8051 problem

    Quote Originally Posted by jayanth.devarayanadurga View Post
    Zip and post the project files + Proteus file. I will test it. Connect a 3V Cell to DS1307.
    hello sir
    proteus file and hex file is uploaded in proteus.rar



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    Re: RTC DS1307 Interfacing with 8051 problem

    Which key has to be pressed to run the time. Here the current time is shown but time doesn't run.



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    Re: RTC DS1307 Interfacing with 8051 problem

    Quote Originally Posted by jayanth.devarayanadurga View Post
    Which key has to be pressed to run the time. Here the current time is shown but time doesn't run.
    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



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    Re: RTC DS1307 Interfacing with 8051 problem

    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 by jayanth.devarayanadurga; 17th October 2013 at 09:52.



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    Re: RTC DS1307 Interfacing with 8051 problem

    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...



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    Re: RTC DS1307 Interfacing with 8051 problem

    I don't know about Proteus 6.9. I used Proteus 7.10.



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    Re: RTC DS1307 Interfacing with 8051 problem

    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



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    Re: RTC DS1307 Interfacing with 8051 problem

    Quote Originally Posted by MANO.5 View Post
    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
    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
    #include"ds1307.h"
    #include
    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

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    Re: RTC DS1307 Interfacing with 8051 problem

    See if you can copy this and complete your project. http://saeedsolutions.blogspot.in/20...s1307-rtc.html



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    Re: RTC DS1307 Interfacing with 8051 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:

    this is also not working.the same error is repeated.

    - - - Updated - - -

    Quote Originally Posted by jayanth.devarayanadurga View Post
    See if you can copy this and complete your project. http://saeedsolutions.blogspot.in/20...s1307-rtc.html

    hello sir,
    i check this site.But i can't open that simulation file.I will try it



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    Re: RTC DS1307 Interfacing with 8051 problem

    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?


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    Re: RTC DS1307 Interfacing with 8051 problem

    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



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    Re: RTC DS1307 Interfacing with 8051 problem

    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.

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    Re: RTC DS1307 Interfacing with 8051 problem

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



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    Re: RTC DS1307 Interfacing with 8051 problem

    Then you need to remove the following preprocessor statement:

    Code:
    #include
    You cannot include a header file which does not exist.

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    Re: RTC DS1307 Interfacing with 8051 problem

    hello sir not working after removing also.

    - - - Updated - - -

    I am going through this thread.anybody having idea about that...
    https://www.edaboard.com/thread270617.html



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