/*
*************SOURCE FILE********************
File saved as       i2c.c
Compiler:           XC8 v1.38
CCI compliant?      Yes
Software function   Provides an I2C MASTER port functionality
Written by          Mainly Microchip C18 code adapted by Russell E. Tribe
Date                26/9/16
For (PIC type)      Various but developed on PIC16F1459
Other information   SDA on pin 13 (RB4)
                    SCL on pin 11 (RB6)
*/

/** I N C L U D E S ***********************************************/
#include <xc.h>         //Provides PIC header file and is required for CCI compliance     
#include "i2c.h"        //Provides header data for these functions

/** FUNCTIONS *****************************************************/
void OpenI2C (unsigned char sync_mode, unsigned char slew)
{
    SSP1STAT &= 0x3F;       //Power on state 
    SSP1CON1 = 0x00;        //Power on state
    SSP1CON2 = 0x00;        //Power on state
    SSP1CON1 |= sync_mode;  //Select required I2C mode 
    SSP1STAT |= slew;       //Select slew rate control on/off 

    I2C_SCL = 1;            //TRIS to input
    I2C_SDA = 1;            //TRIS to input
    SSP1CON1 |= SSPENB;     //Enable synchronous serial port
    IdleI2C ();             //Wait until I2C bus is in idle mode
}

//****************************************
void CloseI2C (void)
{
    IdleI2C ();             //Wait until I2C bus is in idle mode
    SSP1CON1 &= 0xDF;       //Disable synchronous serial port
}

//****************************************
void StartI2C (void)
{
    SSP1CON2bits.SEN = 1;   //Initiate bus start condition
}

//****************************************
void RestartI2C (void)
{
    SSP1CON2bits.RSEN = 1;  //Initiate bus restart condition
    IdleI2C ();             //Wait until I2C bus is in idle mode
}

//****************************************
void StopI2C (void)
{
    SSP1CON2bits.PEN = 1;   //Initiate bus stop condition
    IdleI2C ();             //Wait until I2C bus is in idle mode
}

//****************************************
//This is my function - written as a self-contained function for MASTER mode only
void masterSendI2C (unsigned char data_out)
{
    unsigned char temp;
    
    do
    {
        do
        {
            temp = SSP1BUF;         //Read and discard to clear the BF flag
            SSP1CON1bits.WCOL=0;    //Clear the bus collision status bit (if set))
            SSP1BUF = data_out;     //Send the data byte
        }  
        while (SSP1CON1bits.WCOL);  //Repeat if a write collision occurred
     
        while(SSP1STATbits.BF);     //Wait until write cycle is complete   
        IdleI2C();                  //Ensure module is idle
    }
    while (SSP1CON2bits.ACKSTAT);   //Repeat until ACK received
}

//****************************************
//Wait here until I2C bus is in idle mode
void IdleI2C (void)
{
    while ((SSP1CON2 & 0x1F) || (SSP1STATbits.R_nW))
    continue;
}

//****************************************