Can any one help me with I2C?
What should I do at salve side of PIC16f877a

MPLAB v8.33
HITECH C compiler 9.7
Ω°Ω°Ω°Ω°

 

*sigh*

no one can help you with such minimal information.

please post more detail or delete your post

 

Why not use ordinary serial comms?
I2C was implemented to talk to third party chips.
I'm not sure you'd find existing routines for communications on the slave side.

 

I had a burn and the doctor put salve on it.

But I wouldnt but salve on a PIC16f877a, unless it had dry skin.

As for you other problem, What are you using as the MASTER, and why are you using I2C?

 

i m just starting
Please see this code and state my mistake

/*master.c*/
#include<htc.h>


__CONFIG(HS & WDTDIS & PWRTEN & LVPDIS & BORDIS);

unsigned char _data, i=0x00;

void Init_I2C()
{
    TRISC3=0;    //SCL
    TRISC4=0;    //SDA
    SSPCON=0x38;
    SSPCON2=0x00;
    SMP=1;
    SSPEN=1;
    CKE=0;
    SSPIF=0;
    BCLIF=0;    //bus collision flag
    SSPADD=0x63;    
    SEN=1;
    TRISB=0x00;
    PORTB=0x00;
    TRISD7=0;
    RD7=0;
}









void main()
{
    Init_I2C();
   
    while(1)
    {
        
        SEN=1;
        ACKSTAT=1;
        i=0;
       
    
        RCEN=1;
        ACKEN=1;
        
        while(SSPIF==0);
        SSPIF=0;
    
        SSPBUF=i;        
        i++;
      
        while(SSPIF==0);
        SSPIF=0;
        SSPBUF=i;
        i++;
      
        while(SSPIF==0);
        SSPIF=0;
        PEN=1;
        while(SSPIF==0);
        SSPIF=0;
        delay_Nms(100);
    }
}

/*slave.c*/


#include<htc.h>




__CONFIG(HS & WDTDIS & PWRTEN & LVPDIS & BORDIS);

unsigned char _data;







void Init_I2C()
{
    TRISC3=1;    //SCL
    TRISC4=1;    //SDA
    SSPCON=0x3E;    //slave mode
    SSPCON2=0x00;
    SMP=1;
    ei();    
    
    CKE=0;
    CKP=1;
    SSPEN=1;
    SSPIF=0;
    SSPADD=0x69;
    BCLIF=0;    
    TRISB=0x00;
    PORTB=0x00;
    TRISD7=0;
    RD7=0;
    SEN=1;
    SSPOV=0;
}






void main()
{
    Init_I2C();
    while(1)
    {
        PORTB=_data;
        
    }
}

void interrupt ISR(void)
{
    if(SSPIF)
    {
        if(RW==1)
        {
           
            RD7=1;
            _data=SSPBUF;
            CKP=1;
        }
        SSPIF=0;    
                
    }
}

 

What are you talking to with the I2C bus? A PIC on one side, but what is on the other?

 

its PIC16f877a both

 

Ok, so you want 2 PIC 16f877a to talk to each other.

Is this an assignment or can you choose to use a different communications protocol?

 

Assisgnment

 

ok. What are you using as a clock for the master? I see nothing in you code.

 

20Mhz XTAL

 

Can you post a schematic of your master and slave setup?

 

I used Proteus Vsm to test it