Interfacing rtc(ds1307) pic24f

[Ranjitharanju]

Hi All,
I am trying to interface RTC(DS1307 WITH I2C ) with pic24fj128ga010, somewhere i m doing mistake but i m not getting where please can any one find wt i m doing wrong and help me please..


here is my code

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#include <libpic30.h>
#include<p24fj128ga010.h>
#define FCY 16000000
_CONFIG1( JTAGEN_OFF & GCP_OFF & GWRP_OFF & COE_OFF & FWDTEN_OFF & ICS_PGx2) 
_CONFIG2( FCKSM_CSDCMD & OSCIOFNC_OFF & POSCMOD_HS & FNOSC_PRIPLL)
#define SECOND 0x00
#define MINUTE 0x01
#define HOUR   0X02
#define DAY    0x03
#define DATE   0x04
#define MONTH  0X05
#define YEAR   0X06
 
unsigned char TIME[6]="  :  :  ";
unsigned char sec,min,hour,day,date,month,year;
unsigned char date_day[9] = "00/00/0000";
//****************I2C DRIVERS***************************
void __attribute__((interrupt,no_auto_psv)) _MI2C1Interrupt(void)
{
    //do nothing 
    IFS1bits.MI2C1IF = 0;
 
}
void I2c_init(void)
{
    //TRISGbits.TRISG2 = 1;
    //TRISGbits.TRISG3 = 1;
    //I2C1STAT= 0x0030;
    I2C1STAT= 0x0000;
    //I2C1CON = 0x1240;
    I2C1CON = 0x8000;
    //I2C1ADD = 0x0D;
    I2C1MSK = 0x0000;
    I2C1BRG = 79;                                       //BUAD RATE 100KHz
    //IEC1bits.MI2C1IE = 1;
    //I2C1CONbits.I2CEN = 1;
}
void start(void)                                        //start of i2c
{
    I2C1CONbits.SEN = 1;
    while(I2C1CONbits.SEN); 
}
 
void stop(void)                                         //stop i2c
{
    I2C1CONbits.PEN = 1;
    while(I2C1CONbits.PEN);
}
 
void repeate_start(void)                                //restart i2c
{
    I2C1CONbits.RSEN = 1;
    while(I2C1CONbits.RSEN);
}
 
void data_byte_write(unsigned char write_dat)           //writing from master to slave
{
    I2C1TRN =write_dat;                                 //
    while(I2C1STATbits.TBF);                            //  Write Information bit waiting for tbf = 1;
}
unsigned char data_byte_read(unsigned char ack)    
{
    unsigned char recval;
    I2C1CONbits.RSEN = 1;
    while(I2C1CONbits.RSEN);
    //I2C1RCV = I2C1TRN;
    recval = I2C1RCV;
    __delay32(40);
    while(I2C1STATbits.RBF);
    while(!IFS1bits.MI2C1IF);   
    if(ack == 0)
    {
        I2C1CONbits.ACKDT = 0;
    }
    else if(ack == 1)
    {
        I2C1CONbits.ACKDT = 1;
    }   
    I2C1CONbits.ACKEN = 1;
    while(I2C1CONbits.ACKEN);
    
    return(recval);
    
}
unsigned char getdata(unsigned char address)            //reading the data from slave
{
    unsigned char val;
    I2C1CONbits.I2CEN = 1;
    start();
    data_byte_write(0xD0);                              //slave address
    while(!IFS1bits.MI2C1IF);                   
    while(I2C1STATbits.ACKSTAT);
    
    data_byte_write(address);
    while(!IFS1bits.MI2C1IF);                   
    while(I2C1STATbits.ACKSTAT);
    
    repeate_start();
    data_byte_write(0xD0+1);
    while(!IFS1bits.MI2C1IF);                   
    while(I2C1STATbits.ACKSTAT);
    
    val = data_byte_read(1);
    stop();
    I2C1CONbits.I2CEN = 0;
    return (val);   
}
 
 
//**********************END OF I2C DRIVERS**************
 
int main (void)
{   
    
    while(!OSCCONbits.LOCK ); 
    
                    // CLOCK FREQUENCY
    I2c_init();
                    
    while(1)
    {
    //  __delay_ms(100);
        sec     = getdata(SECOND);
        min     = getdata( MINUTE);
        hour    = getdata(HOUR);
        day     = getdata(DAY);
        date    = getdata( DATE);
        month   = getdata(MONTH);
        year    = getdata(YEAR);
    }   
        
    return 0;
    
}

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Thanks.