I2C driver problem with PIC16F18877.

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sanket meher
 
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/* I2C library*/

#include <xc.h>
#include "i2c.h"


// The flag to indicate whether an I2C error has occured.
unsigned char b_i2c_error_flag = 0;

// Function Purpose: Configure I2C module
void InitI2C(void)
{ 
        
        SDA_DIR = 1; // Make SDA and
 SCK_DIR = 1; // SCK pins input
    
 SSP1ADD = 0x4F;//((_XTAL_FREQ/4000)/I2C_SPEED) - 1; 
 SSP1STAT = 0x80; // Slew Rate control is disabled
 SSP1CON1 = 0x28; // Select and enable I2C in master mode
  
}


unsigned char b_i2c_check_error_flag(void)
{
 return b_i2c_error_flag; 
}

// Function Purpose: I2C_Start sends start bit sequence
void I2C_Start(void)
{
 SSP1CON2bits.SEN = 1; // Send start bit
 while(SSP1CON2bits.SEN == 1); // Wait for it to complete 
}

// Function Purpose: I2C_ReStart sends start bit sequence
void I2C_ReStart(void)
{
 
 SSP1CON2bits.RSEN = 1; // Send start bit
 while(SSP1CON2bits.RSEN == 1); // Wait for it to complete
}

//Function : I2C_Stop sends stop bit sequence
void I2C_Stop(void)
{
 
 SSP1CON2bits.PEN = 1; // Send start bit
 while(SSP1CON2bits.PEN == 1);
}

//Function : I2C_Send_ACK sends ACK bit sequence
void I2C_Send_ACK(void)
{
 SSP1CON2bits.ACKDT = 0; // 0 means ACK
 SSP1CON2bits.ACKEN = 1; // Send ACKDT value
 while(SSP1CON2bits.ACKEN == 1); // Wait for it to complete 
}

//Function : I2C_Send_NACK sends NACK bit sequence
void I2C_Send_NACK(void)
{
 SSP1CON2bits.ACKDT = 1; // 0 means ACK
 SSP1CON2bits.ACKEN = 1; // Send ACKDT value
 while(SSP1CON2bits.ACKEN == 1); 
}

// Function Purpose: I2C_Write_Byte transfers one byte
void I2C_Write_Byte(unsigned char Byte)
{
  // Clear the error flag before we start a new I2C operation.
 b_i2c_error_flag = 0;
 SSP1BUF = Byte; // Send Byte value
 while (SSP1STATbits.R_W == 1);// Wait for slave to acknowledge.
  
 // If slave does not acknowledge...
 if (SSP1CON2bits.ACKSTAT == 1) {
  // Send stop bit.
  SSP1CON2bits.PEN = 1;
  while (SSP1CON2bits.PEN == 1);
  
  // Set the error flag and exit.
  b_i2c_error_flag = 1;
  return;
 }
 
}

// Function Purpose: I2C_Read_Byte reads one byte
unsigned char I2C_Read_Byte(void )
{
  SSP1CON2bits.RCEN=1; // Enable to receive data 
        
    // Wait until the data is received.
 unsigned long count = 10000L;
 while (SSP1STATbits.BF == 0) {
  
  // If timeout...
  if (--count == 0) {
   // Send stop bit.
   SSP1CON2bits.PEN = 1;
   while (SSP1CON2bits.PEN == 1);
   
   // Set the error flag and exit.
   b_i2c_error_flag = 1;
   return 0;
  }
 }
 
  return SSP1BUF; // Return received byte
}

i2c.c
Displaying i2c.c.